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 #include <linux/namei.h>
  35 #else
  36 #include <liblustre.h>
  37 #endif
  38 #include <linux/ext2_fs.h>
  39
  40 #include <linux/obd_support.h>
  41 #include <linux/lustre_lib.h>
  42 #include <linux/lustre_net.h>
  43 #include <linux/lustre_idl.h>
  44 #include <linux/lustre_dlm.h>
  45 #include <linux/lustre_mds.h>
  46 #include <linux/obd_class.h>
  47 #include <linux/obd_ost.h>
  48 #include <linux/lprocfs_status.h>
  49 #include <linux/lustre_fsfilt.h>
  50 #include <linux/obd_lmv.h>
  51 #include <linux/lustre_lite.h>
  52 #include "lmv_internal.h"
  53
  54 /* not defined for liblustre building */
  55 #if !defined(ATOMIC_INIT)
  56 #define ATOMIC_INIT(val) { (val) }
  57 #endif
  58
  59 /* object cache. */
  60 kmem_cache_t *obj_cache;
  61 atomic_t obj_cache_count = ATOMIC_INIT(0);
  62
  63 static void lmv_activate_target(struct lmv_obd *lmv,
  64                                 struct lmv_tgt_desc *tgt,
  65                                 int activate)
  66 {
  67         if (tgt->active == activate)
  68                 return;
  69
  70         tgt->active = activate;
  71         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  72 }
  73
  74 /* Error codes:
  75  *
  76  *  -EINVAL  : UUID can't be found in the LMV's target list
  77  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  78  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  79  */
  80 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
  81                               int activate)
  82 {
  83         struct lmv_tgt_desc *tgt;
  84         struct obd_device *obd;
  85         int i, rc = 0;
  86         ENTRY;
  87
  88         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  89                lmv, uuid->uuid, activate);
  90
  91         spin_lock(&lmv->lmv_lock);
  92         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
  93                 if (tgt->ltd_exp == NULL)
  94                         continue;
  95
  96                 CDEBUG(D_INFO, "lmv idx %d is %s conn "LPX64"\n",
  97                        i, tgt->uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
  98
  99                 if (obd_uuid_equals(uuid, &tgt->uuid))
 100                         break;
 101         }
 102
 103         if (i == lmv->desc.ld_tgt_count)
 104                 GOTO(out_lmv_lock, rc = -EINVAL);
 105
 106         obd = class_exp2obd(tgt->ltd_exp);
 107         if (obd == NULL)
 108                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 109
 110         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 111                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 112                obd->obd_type->typ_name, i);
 113         LASSERT(strcmp(obd->obd_type->typ_name, OBD_MDC_DEVICENAME) == 0);
 114
 115         if (tgt->active == activate) {
 116                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 117                        activate ? "" : "in");
 118                 GOTO(out_lmv_lock, rc);
 119         }
 120
 121         CDEBUG(D_INFO, "Marking OBD %p %sactive\n",
 122                obd, activate ? "" : "in");
 123
 124         lmv_activate_target(lmv, tgt, activate);
 125
 126         EXIT;
 127
 128  out_lmv_lock:
 129         spin_unlock(&lmv->lmv_lock);
 130         return rc;
 131 }
 132
 133 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 134                       int active, void *data)
 135 {
 136         struct obd_uuid *uuid;
 137         int rc;
 138         ENTRY;
 139
 140         if (strcmp(watched->obd_type->typ_name, OBD_MDC_DEVICENAME)) {
 141                 CERROR("unexpected notification of %s %s!\n",
 142                        watched->obd_type->typ_name,
 143                        watched->obd_name);
 144                 RETURN(-EINVAL);
 145         }
 146         uuid = &watched->u.cli.cl_import->imp_target_uuid;
 147
 148         /* Set MDC as active before notifying the observer, so the observer can
 149          * use the MDC normally.
 150          */
 151         rc = lmv_set_mdc_active(&obd->u.lmv, uuid, active);
 152         if (rc) {
 153                 CERROR("%sactivation of %s failed: %d\n",
 154                        active ? "" : "de", uuid->uuid, rc);
 155                 RETURN(rc);
 156         }
 157
 158         if (obd->obd_observer)
 159                 /* Pass the notification up the chain. */
 160                 rc = obd_notify(obd->obd_observer, watched, active, data);
 161
 162         RETURN(rc);
 163 }
 164
 165 static int lmv_attach(struct obd_device *dev, obd_count len, void *data)
 166 {
 167         struct lprocfs_static_vars lvars;
 168         int rc;
 169         ENTRY;
 170
 171         lprocfs_init_vars(lmv, &lvars);
 172         rc = lprocfs_obd_attach(dev, lvars.obd_vars);
 173 #ifdef __KERNEL__
 174         if (rc == 0) {
 175                 struct proc_dir_entry *entry;
 176
 177                 entry = create_proc_entry("target_obd_status", 0444,
 178                                            dev->obd_proc_entry);
 179                 if (entry == NULL)
 180                         RETURN(-ENOMEM);
 181                 entry->proc_fops = &lmv_proc_target_fops;
 182                 entry->data = dev;
 183        }
 184 #endif
 185         RETURN (rc);
 186 }
 187
 188 static int lmv_detach(struct obd_device *dev)
 189 {
 190         return lprocfs_obd_detach(dev);
 191 }
 192
 193 /* this is fake connect function. Its purpose is to initialize lmv and say
 194  * caller that everything is okay. Real connection will be performed later. */
 195 static int lmv_connect(struct lustre_handle *conn, struct obd_device *obd,
 196                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 197                        unsigned long flags)
 198 {
 199 #ifdef __KERNEL__
 200         struct proc_dir_entry *lmv_proc_dir;
 201 #endif
 202         struct lmv_obd *lmv = &obd->u.lmv;
 203         struct obd_export *exp;
 204         int rc = 0;
 205         ENTRY;
 206
 207         rc = class_connect(conn, obd, cluuid);
 208         if (rc) {
 209                 CERROR("class_connection() returned %d\n", rc);
 210                 RETURN(rc);
 211         }
 212
 213         exp = class_conn2export(conn);
 214
 215         /* we don't want to actually do the underlying connections more than
 216          * once, so keep track. */
 217         lmv->refcount++;
 218         if (lmv->refcount > 1) {
 219                 class_export_put(exp);
 220                 RETURN(0);
 221         }
 222
 223         lmv->exp = exp;
 224         lmv->connected = 0;
 225         lmv->cluuid = *cluuid;
 226         lmv->connect_flags = flags;
 227         sema_init(&lmv->init_sem, 1);
 228         if (data)
 229                 memcpy(&lmv->conn_data, data, sizeof(*data));
 230
 231 #ifdef __KERNEL__
 232         lmv_proc_dir = lprocfs_register("target_obds", obd->obd_proc_entry,
 233                                         NULL, NULL);
 234         if (IS_ERR(lmv_proc_dir)) {
 235                 CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 236                        obd->obd_type->typ_name, obd->obd_name);
 237                 lmv_proc_dir = NULL;
 238         }
 239 #endif
 240
 241         /*
 242          * all real clients shouls perform actual connection rightaway, because
 243          * it is possible, that LMV will not have opportunity to connect
 244          * targets, as MDC stuff will bit called directly, for instance while
 245          * reading ../mdc/../kbytesfree procfs file, etc.
 246          */
 247         if (flags & OBD_OPT_REAL_CLIENT)
 248                 rc = lmv_check_connect(obd);
 249
 250 #ifdef __KERNEL__
 251         if (rc) {
 252                 if (lmv_proc_dir)
 253                         lprocfs_remove(lmv_proc_dir);
 254         }
 255 #endif
 256
 257         RETURN(rc);
 258 }
 259
 260 static void lmv_set_timeouts(struct obd_device *obd)
 261 {
 262         struct lmv_tgt_desc *tgts;
 263         struct lmv_obd *lmv;
 264         int i;
 265
 266         lmv = &obd->u.lmv;
 267         if (lmv->server_timeout == 0)
 268                 return;
 269
 270         if (lmv->connected == 0)
 271                 return;
 272
 273         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 274                 if (tgts->ltd_exp == NULL)
 275                         continue;
 276
 277                 obd_set_info(tgts->ltd_exp, strlen("inter_mds"),
 278                              "inter_mds", 0, NULL);
 279         }
 280 }
 281
 282 #define MAX_STRING_SIZE 128
 283
 284 /* performs a check if passed obd is connected. If no - connect it. */
 285 int lmv_check_connect(struct obd_device *obd)
 286 {
 287 #ifdef __KERNEL__
 288         struct proc_dir_entry *lmv_proc_dir;
 289 #endif
 290         struct lmv_obd *lmv = &obd->u.lmv;
 291         struct lmv_tgt_desc *tgts;
 292         struct obd_uuid *cluuid;
 293         struct obd_export *exp;
 294         int rc, rc2, i;
 295         ENTRY;
 296
 297         if (lmv->connected)
 298                 RETURN(0);
 299
 300         down(&lmv->init_sem);
 301         if (lmv->connected) {
 302                 up(&lmv->init_sem);
 303                 RETURN(0);
 304         }
 305
 306         cluuid = &lmv->cluuid;
 307         exp = lmv->exp;
 308
 309         CDEBUG(D_OTHER, "time to connect %s to %s\n",
 310                cluuid->uuid, obd->obd_name);
 311
 312         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 313                 struct obd_uuid lmv_mdc_uuid = { "LMV_MDC_UUID" };
 314                 struct lustre_handle conn = {0, };
 315                 struct obd_device *tgt_obd;
 316
 317                 LASSERT(tgts != NULL);
 318
 319                 tgt_obd = class_find_client_obd(&tgts->uuid, OBD_MDC_DEVICENAME,
 320                                                 &obd->obd_uuid);
 321                 if (!tgt_obd) {
 322                         CERROR("target %s not attached\n", tgts->uuid.uuid);
 323                         GOTO(out_disc, rc = -EINVAL);
 324                 }
 325
 326                 /* for MDS: don't connect to yourself */
 327                 if (obd_uuid_equals(&tgts->uuid, cluuid)) {
 328                         CDEBUG(D_OTHER, "don't connect back to %s\n",
 329                                cluuid->uuid);
 330                         tgts->ltd_exp = NULL;
 331                         continue;
 332                 }
 333
 334                 CDEBUG(D_OTHER, "connect to %s(%s) - %s, %s FOR %s\n",
 335                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
 336                         tgts->uuid.uuid, obd->obd_uuid.uuid,
 337                         cluuid->uuid);
 338
 339                 if (!tgt_obd->obd_set_up) {
 340                         CERROR("target %s not set up\n", tgts->uuid.uuid);
 341                         GOTO(out_disc, rc = -EINVAL);
 342                 }
 343
 344                 rc = obd_connect(&conn, tgt_obd, &lmv_mdc_uuid, &lmv->conn_data,
 345                                  lmv->connect_flags);
 346                 if (rc) {
 347                         CERROR("target %s connect error %d\n",
 348                                 tgts->uuid.uuid, rc);
 349                         GOTO(out_disc, rc);
 350                 }
 351                 tgts->ltd_exp = class_conn2export(&conn);
 352
 353                 obd_init_ea_size(tgts->ltd_exp, lmv->max_easize,
 354                                  lmv->max_cookiesize);
 355
 356                 rc = obd_register_observer(tgt_obd, obd);
 357                 if (rc) {
 358                         CERROR("target %s register_observer error %d\n",
 359                                tgts->uuid.uuid, rc);
 360                         obd_disconnect(tgts->ltd_exp, 0);
 361                         GOTO(out_disc, rc);
 362                 }
 363
 364                 lmv->desc.ld_active_tgt_count++;
 365                 tgts->active = 1;
 366
 367                 CDEBUG(D_OTHER, "connected to %s(%s) successfully (%d)\n",
 368                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
 369                         atomic_read(&obd->obd_refcount));
 370
 371 #ifdef __KERNEL__
 372                 lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 373                 if (lmv_proc_dir) {
 374                         struct obd_device *mdc_obd = class_conn2obd(&conn);
 375                         struct proc_dir_entry *mdc_symlink;
 376                         char name[MAX_STRING_SIZE + 1];
 377
 378                         LASSERT(mdc_obd != NULL);
 379                         LASSERT(mdc_obd->obd_type != NULL);
 380                         LASSERT(mdc_obd->obd_type->typ_name != NULL);
 381                         name[MAX_STRING_SIZE] = '\0';
 382                         snprintf(name, MAX_STRING_SIZE, "../../../%s/%s",
 383                                  mdc_obd->obd_type->typ_name,
 384                                  mdc_obd->obd_name);
 385                         mdc_symlink = proc_symlink(mdc_obd->obd_name,
 386                                                    lmv_proc_dir, name);
 387                         if (mdc_symlink == NULL) {
 388                                 CERROR("could not register LMV target "
 389                                        "/proc/fs/lustre/%s/%s/target_obds/%s.",
 390                                        obd->obd_type->typ_name, obd->obd_name,
 391                                        mdc_obd->obd_name);
 392                                 lprocfs_remove(lmv_proc_dir);
 393                                 lmv_proc_dir = NULL;
 394                         }
 395                 }
 396 #endif
 397         }
 398
 399         lmv_set_timeouts(obd);
 400         class_export_put(exp);
 401         lmv->connected = 1;
 402         up(&lmv->init_sem);
 403         RETURN(0);
 404
 405  out_disc:
 406         while (i-- > 0) {
 407                 struct obd_uuid uuid;
 408                 --tgts;
 409                 --lmv->desc.ld_active_tgt_count;
 410                 tgts->active = 0;
 411                 /* save for CERROR below; (we know it's terminated) */
 412                 uuid = tgts->uuid;
 413                 rc2 = obd_disconnect(tgts->ltd_exp, 0);
 414                 if (rc2)
 415                         CERROR("error: LMV target %s disconnect on MDC idx %d: "
 416                                "error %d\n", uuid.uuid, i, rc2);
 417         }
 418         class_disconnect(exp, 0);
 419         up(&lmv->init_sem);
 420         return rc;
 421 }
 422
 423 static int lmv_disconnect(struct obd_export *exp, unsigned long flags)
 424 {
 425         struct obd_device *obd = class_exp2obd(exp);
 426         struct lmv_obd *lmv = &obd->u.lmv;
 427
 428 #ifdef __KERNEL__
 429         struct proc_dir_entry *lmv_proc_dir;
 430 #endif
 431         int rc, i;
 432         ENTRY;
 433
 434         if (!lmv->tgts)
 435                 goto out_local;
 436
 437         /* Only disconnect the underlying layers on the final disconnect. */
 438         lmv->refcount--;
 439         if (lmv->refcount != 0)
 440                 goto out_local;
 441
 442 #ifdef __KERNEL__
 443         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 444 #endif
 445
 446         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 447                 struct obd_device *mdc_obd;
 448
 449                 if (lmv->tgts[i].ltd_exp == NULL)
 450                         continue;
 451
 452                 mdc_obd = class_exp2obd(lmv->tgts[i].ltd_exp);
 453
 454                 if (mdc_obd)
 455                         mdc_obd->obd_no_recov = obd->obd_no_recov;
 456
 457 #ifdef __KERNEL__
 458                 if (lmv_proc_dir) {
 459                         struct proc_dir_entry *mdc_symlink;
 460
 461                         mdc_symlink = lprocfs_srch(lmv_proc_dir, mdc_obd->obd_name);
 462                         if (mdc_symlink) {
 463                                 lprocfs_remove(mdc_symlink);
 464                         } else {
 465                                 CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing\n",
 466                                        obd->obd_type->typ_name, obd->obd_name,
 467                                        mdc_obd->obd_name);
 468                         }
 469                 }
 470 #endif
 471                 CDEBUG(D_OTHER, "disconnected from %s(%s) successfully\n",
 472                         lmv->tgts[i].ltd_exp->exp_obd->obd_name,
 473                         lmv->tgts[i].ltd_exp->exp_obd->obd_uuid.uuid);
 474
 475                 obd_register_observer(lmv->tgts[i].ltd_exp->exp_obd, NULL);
 476                 rc = obd_disconnect(lmv->tgts[i].ltd_exp, flags);
 477                 if (rc) {
 478                         if (lmv->tgts[i].active) {
 479                                 CERROR("Target %s disconnect error %d\n",
 480                                        lmv->tgts[i].uuid.uuid, rc);
 481                         }
 482                         rc = 0;
 483                 }
 484
 485                 lmv_activate_target(lmv, &lmv->tgts[i], 0);
 486                 lmv->tgts[i].ltd_exp = NULL;
 487         }
 488
 489 #ifdef __KERNEL__
 490         if (lmv_proc_dir) {
 491                 lprocfs_remove(lmv_proc_dir);
 492         } else {
 493                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 494                        obd->obd_type->typ_name, obd->obd_name);
 495         }
 496 #endif
 497
 498 out_local:
 499         /* this is the case when no real connection is established by
 500          * lmv_check_connect(). */
 501         if (!lmv->connected)
 502                 class_export_put(exp);
 503         rc = class_disconnect(exp, 0);
 504         if (lmv->refcount == 0)
 505                 lmv->connected = 0;
 506         RETURN(rc);
 507 }
 508
 509 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 510                          int len, void *karg, void *uarg)
 511 {
 512         struct obd_device *obddev = class_exp2obd(exp);
 513         struct lmv_obd *lmv = &obddev->u.lmv;
 514         int i, rc = 0, set = 0;
 515         ENTRY;
 516
 517         if (lmv->desc.ld_tgt_count == 0)
 518                 RETURN(-ENOTTY);
 519
 520         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 521                 int err;
 522
 523                 if (lmv->tgts[i].ltd_exp == NULL)
 524                         continue;
 525
 526                 err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp, len, karg, uarg);
 527                 if (err) {
 528                         if (lmv->tgts[i].active) {
 529                                 CERROR("error: iocontrol MDC %s on MDT"
 530                                        "idx %d: err = %d\n",
 531                                        lmv->tgts[i].uuid.uuid, i, err);
 532                                 if (!rc)
 533                                         rc = err;
 534                         }
 535                 } else
 536                         set = 1;
 537         }
 538         if (!set && !rc)
 539                 rc = -EIO;
 540
 541         RETURN(rc);
 542 }
 543
 544 static int lmv_setup(struct obd_device *obd, obd_count len, void *buf)
 545 {
 546         int i, rc = 0;
 547         struct lmv_desc *desc;
 548         struct obd_uuid *uuids;
 549         struct lmv_tgt_desc *tgts;
 550         struct obd_device *tgt_obd;
 551         struct lustre_cfg *lcfg = buf;
 552         struct lmv_obd *lmv = &obd->u.lmv;
 553         ENTRY;
 554
 555         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 556                 CERROR("LMV setup requires a descriptor\n");
 557                 RETURN(-EINVAL);
 558         }
 559
 560         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 561                 CERROR("LMV setup requires an MDT UUID list\n");
 562                 RETURN(-EINVAL);
 563         }
 564
 565         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
 566         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 567                 CERROR("descriptor size wrong: %d > %d\n",
 568                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 569                 RETURN(-EINVAL);
 570         }
 571
 572         uuids = (struct obd_uuid *)lustre_cfg_buf(lcfg, 2);
 573         if (sizeof(*uuids) * desc->ld_tgt_count != LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 574                 CERROR("UUID array size wrong: %u * %u != %u\n",
 575                        sizeof(*uuids), desc->ld_tgt_count, LUSTRE_CFG_BUFLEN(lcfg, 2));
 576                 RETURN(-EINVAL);
 577         }
 578
 579         lmv->tgts_size = sizeof(struct lmv_tgt_desc) * desc->ld_tgt_count;
 580         OBD_ALLOC(lmv->tgts, lmv->tgts_size);
 581         if (lmv->tgts == NULL) {
 582                 CERROR("Out of memory\n");
 583                 RETURN(-ENOMEM);
 584         }
 585
 586         lmv->desc = *desc;
 587         spin_lock_init(&lmv->lmv_lock);
 588
 589         for (i = 0, tgts = lmv->tgts; i < desc->ld_tgt_count; i++, tgts++)
 590                 tgts->uuid = uuids[i];
 591
 592         lmv->max_cookiesize = 0;
 593
 594         lmv->max_easize = sizeof(struct lustre_id) *
 595                 desc->ld_tgt_count + sizeof(struct mea);
 596
 597         rc = lmv_setup_mgr(obd);
 598         if (rc) {
 599                 CERROR("Can't setup LMV object manager, "
 600                        "error %d.\n", rc);
 601                 OBD_FREE(lmv->tgts, lmv->tgts_size);
 602         }
 603
 604         tgt_obd = class_find_client_obd(&lmv->tgts->uuid, OBD_MDC_DEVICENAME,
 605                                         &obd->obd_uuid);
 606         if (!tgt_obd) {
 607                 CERROR("Target %s not attached\n", lmv->tgts->uuid.uuid);
 608                 RETURN(-EINVAL);
 609         }
 610
 611         RETURN(rc);
 612 }
 613
 614 static int lmv_cleanup(struct obd_device *obd, int flags)
 615 {
 616         struct lmv_obd *lmv = &obd->u.lmv;
 617         ENTRY;
 618
 619         lmv_cleanup_mgr(obd);
 620         OBD_FREE(lmv->tgts, lmv->tgts_size);
 621
 622         RETURN(0);
 623 }
 624
 625 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 626                       unsigned long max_age)
 627 {
 628         struct lmv_obd *lmv = &obd->u.lmv;
 629         struct obd_statfs *temp;
 630         int rc = 0, i;
 631         ENTRY;
 632
 633         rc = lmv_check_connect(obd);
 634         if (rc)
 635                 RETURN(rc);
 636
 637         OBD_ALLOC(temp, sizeof(*temp));
 638         if (temp == NULL)
 639                 RETURN(-ENOMEM);
 640
 641         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 642                 if (lmv->tgts[i].ltd_exp == NULL)
 643                         continue;
 644
 645                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, temp, max_age);
 646                 if (rc) {
 647                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
 648                                lmv->tgts[i].ltd_exp->exp_obd->obd_name,
 649                                rc);
 650                         GOTO(out_free_temp, rc);
 651                 }
 652                 if (i == 0) {
 653                         memcpy(osfs, temp, sizeof(*temp));
 654                 } else {
 655                         osfs->os_bavail += temp->os_bavail;
 656                         osfs->os_blocks += temp->os_blocks;
 657                         osfs->os_ffree += temp->os_ffree;
 658                         osfs->os_files += temp->os_files;
 659                 }
 660         }
 661
 662         EXIT;
 663 out_free_temp:
 664         OBD_FREE(temp, sizeof(*temp));
 665         return rc;
 666 }
 667
 668 static int lmv_getstatus(struct obd_export *exp, struct lustre_id *id)
 669 {
 670         struct obd_device *obd = exp->exp_obd;
 671         struct lmv_obd *lmv = &obd->u.lmv;
 672         int rc;
 673         ENTRY;
 674
 675         rc = lmv_check_connect(obd);
 676         if (rc)
 677                 RETURN(rc);
 678
 679         rc = md_getstatus(lmv->tgts[0].ltd_exp, id);
 680         id_group(id) = 0;
 681
 682         RETURN(rc);
 683 }
 684
 685 static int lmv_getattr(struct obd_export *exp, struct lustre_id *id,
 686                        __u64 valid, const char *xattr_name,
 687                        const void *xattr_data, unsigned int xattr_datalen,
 688                        unsigned int ea_size, struct ptlrpc_request **request)
 689 {
 690         struct obd_device *obd = exp->exp_obd;
 691         struct lmv_obd *lmv = &obd->u.lmv;
 692         int rc, i = id_group(id);
 693         struct lmv_obj *obj;
 694         ENTRY;
 695
 696         rc = lmv_check_connect(obd);
 697         if (rc)
 698                 RETURN(rc);
 699
 700         LASSERT(i < lmv->desc.ld_tgt_count);
 701
 702
 703         rc = md_getattr(lmv->tgts[i].ltd_exp, id, valid,
 704                         xattr_name, xattr_data, xattr_datalen,
 705                         ea_size, request);
 706         if (rc)
 707                 RETURN(rc);
 708
 709         obj = lmv_grab_obj(obd, id);
 710
 711         CDEBUG(D_OTHER, "GETATTR for "DLID4" %s\n",
 712                OLID4(id), obj ? "(splitted)" : "");
 713
 714         /*
 715          * if object is splitted, then we loop over all the slaves and gather
 716          * size attribute. In ideal world we would have to gather also mds field
 717          * from all slaves, as object is spread over the cluster and this is
 718          * definitely interesting information and it is not good to loss it,
 719          * but...
 720          */
 721         if (obj) {
 722                 struct mds_body *body;
 723
 724                 if (*request == NULL) {
 725                         lmv_put_obj(obj);
 726                         RETURN(rc);
 727                 }
 728
 729                 body = lustre_msg_buf((*request)->rq_repmsg, 0,
 730                                       sizeof(*body));
 731                 LASSERT(body != NULL);
 732
 733                 lmv_lock_obj(obj);
 734
 735                 for (i = 0; i < obj->objcount; i++) {
 736
 737                         if (lmv->tgts[i].ltd_exp == NULL) {
 738                                 CWARN("%s: NULL export for %d\n",
 739                                       obd->obd_name, i);
 740                                 continue;
 741                         }
 742
 743                         /* skip master obj. */
 744                         if (id_equal_fid(&obj->id, &obj->objs[i].id))
 745                                 continue;
 746
 747                         body->size += obj->objs[i].size;
 748                 }
 749
 750                 lmv_unlock_obj(obj);
 751                 lmv_put_obj(obj);
 752         }
 753
 754         RETURN(rc);
 755 }
 756
 757 static int lmv_access_check(struct obd_export *exp,
 758                             struct lustre_id *id,
 759                             struct ptlrpc_request **request)
 760 {
 761         struct obd_device *obd = exp->exp_obd;
 762         struct lmv_obd *lmv = &obd->u.lmv;
 763         int rc, i = id_group(id);
 764         ENTRY;
 765
 766         rc = lmv_check_connect(obd);
 767         if (rc)
 768                 RETURN(rc);
 769
 770         LASSERT(i < lmv->desc.ld_tgt_count);
 771         rc = md_access_check(lmv->tgts[i].ltd_exp, id, request);
 772         RETURN(rc);
 773 }
 774
 775 static int lmv_change_cbdata(struct obd_export *exp,
 776                              struct lustre_id *id,
 777                              ldlm_iterator_t it,
 778                              void *data)
 779 {
 780         struct obd_device *obd = exp->exp_obd;
 781         struct lmv_obd *lmv = &obd->u.lmv;
 782         int i, rc;
 783         ENTRY;
 784
 785         rc = lmv_check_connect(obd);
 786         if (rc)
 787                 RETURN(rc);
 788
 789         CDEBUG(D_OTHER, "CBDATA for "DLID4"\n", OLID4(id));
 790         LASSERT(id_group(id) < lmv->desc.ld_tgt_count);
 791
 792         /* with CMD every object can have two locks in different
 793          * namespaces: lookup lock in space of mds storing direntry
 794          * and update/open lock in space of mds storing inode */
 795         for (i = 0; i < lmv->desc.ld_tgt_count; i++)
 796                 md_change_cbdata(lmv->tgts[i].ltd_exp, id, it, data);
 797
 798         RETURN(0);
 799 }
 800
 801 static int lmv_change_cbdata_name(struct obd_export *exp,
 802                                   struct lustre_id *pid,
 803                                   char *name, int len,
 804                                   struct lustre_id *cid,
 805                                   ldlm_iterator_t it,
 806                                   void *data)
 807 {
 808         struct obd_device *obd = exp->exp_obd;
 809         struct lmv_obd *lmv = &obd->u.lmv;
 810         struct lustre_id rcid = *cid;
 811         struct lmv_obj *obj;
 812         int rc = 0, mds;
 813         ENTRY;
 814
 815         rc = lmv_check_connect(obd);
 816         if (rc)
 817                 RETURN(rc);
 818
 819         LASSERT(id_group(pid) < lmv->desc.ld_tgt_count);
 820         LASSERT(id_group(cid) < lmv->desc.ld_tgt_count);
 821
 822         CDEBUG(D_OTHER, "CBDATA for "DLID4":%*s -> "DLID4"\n",
 823                OLID4(pid), len, name, OLID4(cid));
 824
 825         /* this is default mds for directory name belongs to. */
 826         mds = id_group(pid);
 827         obj = lmv_grab_obj(obd, pid);
 828         if (obj) {
 829                 /* directory is splitted. look for right mds for this name. */
 830                 mds = raw_name2idx(obj->hashtype, obj->objcount, name, len);
 831                 rcid = obj->objs[mds].id;
 832                 mds = id_group(&rcid);
 833                 lmv_put_obj(obj);
 834         }
 835         rc = md_change_cbdata(lmv->tgts[mds].ltd_exp, &rcid, it, data);
 836         RETURN(rc);
 837 }
 838
 839 static int lmv_valid_attrs(struct obd_export *exp, struct lustre_id *id)
 840 {
 841         struct obd_device *obd = exp->exp_obd;
 842         struct lmv_obd *lmv = &obd->u.lmv;
 843         int rc = 0;
 844         ENTRY;
 845
 846         rc = lmv_check_connect(obd);
 847         if (rc)
 848                 RETURN(rc);
 849
 850         CDEBUG(D_OTHER, "validate "DLID4"\n", OLID4(id));
 851         LASSERT(id_group(id) < lmv->desc.ld_tgt_count);
 852         rc = md_valid_attrs(lmv->tgts[id_group(id)].ltd_exp, id);
 853         RETURN(rc);
 854 }
 855
 856 static int lmv_close(struct obd_export *exp, struct obdo *obdo,
 857                      struct obd_client_handle *och,
 858                      struct ptlrpc_request **request)
 859 {
 860         struct obd_device *obd = exp->exp_obd;
 861         struct lmv_obd *lmv = &obd->u.lmv;
 862         int rc, i = obdo->o_mds;
 863         ENTRY;
 864
 865         rc = lmv_check_connect(obd);
 866         if (rc)
 867                 RETURN(rc);
 868
 869         LASSERT(i < lmv->desc.ld_tgt_count);
 870         CDEBUG(D_OTHER, "CLOSE %lu/%lu/%lu\n", (unsigned long)obdo->o_mds,
 871                (unsigned long)obdo->o_id, (unsigned long)obdo->o_generation);
 872         rc = md_close(lmv->tgts[i].ltd_exp, obdo, och, request);
 873         RETURN(rc);
 874 }
 875
 876 int lmv_get_mea_and_update_object(struct obd_export *exp,
 877                                   struct lustre_id *id)
 878 {
 879         struct obd_device *obd = exp->exp_obd;
 880         struct lmv_obd *lmv = &obd->u.lmv;
 881         struct ptlrpc_request *req = NULL;
 882         struct lmv_obj *obj;
 883         struct lustre_md md;
 884         int mealen, rc;
 885         __u64 valid;
 886         ENTRY;
 887
 888         md.mea = NULL;
 889         mealen = MEA_SIZE_LMV(lmv);
 890
 891         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA | OBD_MD_MEA;
 892
 893         /* time to update mea of parent id */
 894         rc = md_getattr(lmv->tgts[id_group(id)].ltd_exp,
 895                         id, valid, NULL, NULL, 0, mealen, &req);
 896         if (rc) {
 897                 CERROR("md_getattr() failed, error %d\n", rc);
 898                 GOTO(cleanup, rc);
 899         }
 900
 901         rc = mdc_req2lustre_md(exp, req, 0, NULL, &md);
 902         if (rc) {
 903                 CERROR("mdc_req2lustre_md() failed, error %d\n", rc);
 904                 GOTO(cleanup, rc);
 905         }
 906
 907         if (md.mea == NULL)
 908                 GOTO(cleanup, rc = -ENODATA);
 909
 910         obj = lmv_create_obj(exp, id, md.mea);
 911         if (IS_ERR(obj))
 912                 rc = PTR_ERR(obj);
 913         else
 914                 lmv_put_obj(obj);
 915
 916         obd_free_memmd(exp, (struct lov_stripe_md **)&md.mea);
 917
 918         EXIT;
 919 cleanup:
 920         if (req)
 921                 ptlrpc_req_finished(req);
 922         return rc;
 923 }
 924
 925 int lmv_create(struct obd_export *exp, struct mdc_op_data *op_data,
 926                const void *data, int datalen, int mode, __u32 uid,
 927                __u32 gid, __u64 rdev, struct ptlrpc_request **request)
 928 {
 929         struct obd_device *obd = exp->exp_obd;
 930         struct lmv_obd *lmv = &obd->u.lmv;
 931         struct mds_body *body;
 932         struct lmv_obj *obj;
 933         int rc, mds, loop = 0;
 934         ENTRY;
 935
 936         rc = lmv_check_connect(obd);
 937         if (rc)
 938                 RETURN(rc);
 939
 940         if (!lmv->desc.ld_active_tgt_count)
 941                 RETURN(-EIO);
 942 repeat:
 943         LASSERT(++loop <= 2);
 944         obj = lmv_grab_obj(obd, &op_data->id1);
 945         if (obj) {
 946                 mds = raw_name2idx(obj->hashtype, obj->objcount,
 947                                    op_data->name, op_data->namelen);
 948                 op_data->id1 = obj->objs[mds].id;
 949                 lmv_put_obj(obj);
 950         }
 951
 952         CDEBUG(D_OTHER, "CREATE '%*s' on "DLID4"\n", op_data->namelen,
 953                op_data->name, OLID4(&op_data->id1));
 954
 955         rc = md_create(lmv->tgts[id_group(&op_data->id1)].ltd_exp,
 956                        op_data, data, datalen, mode, uid, gid, rdev,
 957                        request);
 958         if (rc == 0) {
 959                 if (*request == NULL)
 960                         RETURN(rc);
 961
 962                 body = lustre_msg_buf((*request)->rq_repmsg, 0,
 963                                       sizeof(*body));
 964                 if (body == NULL)
 965                         RETURN(-ENOMEM);
 966
 967                 CDEBUG(D_OTHER, "created. "DLID4"\n", OLID4(&op_data->id1));
 968         } else if (rc == -ERESTART) {
 969                 /*
 970                  * directory got splitted. time to update local object and
 971                  * repeat the request with proper MDS.
 972                  */
 973                 rc = lmv_get_mea_and_update_object(exp, &op_data->id1);
 974                 if (rc == 0) {
 975                         ptlrpc_req_finished(*request);
 976                         goto repeat;
 977                 }
 978         }
 979         RETURN(rc);
 980 }
 981
 982 static int lmv_done_writing(struct obd_export *exp, struct obdo *obdo)
 983 {
 984         struct obd_device *obd = exp->exp_obd;
 985         struct lmv_obd *lmv = &obd->u.lmv;
 986         int rc;
 987         ENTRY;
 988
 989         rc = lmv_check_connect(obd);
 990         if (rc)
 991                 RETURN(rc);
 992
 993         /* FIXME: choose right MDC here */
 994         CWARN("this method isn't implemented yet\n");
 995         rc = md_done_writing(lmv->tgts[0].ltd_exp, obdo);
 996         RETURN(rc);
 997 }
 998
 999 static int
1000 lmv_enqueue_slaves(struct obd_export *exp, int locktype,
1001                    struct lookup_intent *it, int lockmode,
1002                    struct mdc_op_data *data, struct lustre_handle *lockh,
1003                    void *lmm, int lmmsize, ldlm_completion_callback cb_compl,
1004                    ldlm_blocking_callback cb_blocking, void *cb_data)
1005 {
1006         struct obd_device *obd = exp->exp_obd;
1007         struct lmv_obd *lmv = &obd->u.lmv;
1008         struct mea *mea = data->mea1;
1009         struct mdc_op_data *data2;
1010         int i, rc, mds;
1011         ENTRY;
1012
1013         OBD_ALLOC(data2, sizeof(*data2));
1014         if (data2 == NULL)
1015                 RETURN(-ENOMEM);
1016
1017         LASSERT(mea != NULL);
1018         for (i = 0; i < mea->mea_count; i++) {
1019                 memset(data2, 0, sizeof(*data2));
1020                 data2->id1 = mea->mea_ids[i];
1021                 mds = id_group(&data2->id1);
1022
1023                 if (lmv->tgts[mds].ltd_exp == NULL)
1024                         continue;
1025
1026                 rc = md_enqueue(lmv->tgts[mds].ltd_exp, locktype, it,
1027                                 lockmode, data2, lockh + i, lmm, lmmsize,
1028                                 cb_compl, cb_blocking, cb_data);
1029
1030                 CDEBUG(D_OTHER, "take lock on slave "DLID4" -> %d/%d\n",
1031                        OLID4(&mea->mea_ids[i]), rc, LUSTRE_IT(it)->it_status);
1032                 if (rc)
1033                         GOTO(cleanup, rc);
1034                 if (LUSTRE_IT(it)->it_data) {
1035                         struct ptlrpc_request *req;
1036                         req = (struct ptlrpc_request *) LUSTRE_IT(it)->it_data;
1037                         ptlrpc_req_finished(req);
1038                 }
1039
1040                 if (LUSTRE_IT(it)->it_status)
1041                         GOTO(cleanup, rc = LUSTRE_IT(it)->it_status);
1042         }
1043
1044         OBD_FREE(data2, sizeof(*data2));
1045         RETURN(0);
1046 cleanup:
1047         OBD_FREE(data2, sizeof(*data2));
1048
1049         /* drop all taken locks */
1050         while (--i >= 0) {
1051                 if (lockh[i].cookie)
1052                         ldlm_lock_decref(lockh + i, lockmode);
1053                 lockh[i].cookie = 0;
1054         }
1055         return rc;
1056 }
1057
1058 static int
1059 lmv_enqueue_remote(struct obd_export *exp, int lock_type,
1060                    struct lookup_intent *it, int lock_mode,
1061                    struct mdc_op_data *data, struct lustre_handle *lockh,
1062                    void *lmm, int lmmsize, ldlm_completion_callback cb_compl,
1063                    ldlm_blocking_callback cb_blocking, void *cb_data)
1064 {
1065         struct ptlrpc_request *req = LUSTRE_IT(it)->it_data;
1066         struct obd_device *obd = exp->exp_obd;
1067         struct lmv_obd *lmv = &obd->u.lmv;
1068         struct lustre_handle plock;
1069         struct mdc_op_data rdata;
1070         struct mds_body *body = NULL;
1071         int rc = 0, pmode;
1072         ENTRY;
1073
1074         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof(*body));
1075         LASSERT(body != NULL);
1076
1077         if (!(body->valid & OBD_MD_MDS))
1078                 RETURN(0);
1079
1080         CDEBUG(D_OTHER, "ENQUEUE '%s' on "DLID4" -> "DLID4"\n",
1081                LL_IT2STR(it), OLID4(&data->id1), OLID4(&body->id1));
1082
1083         /* we got LOOKUP lock, but we really need attrs */
1084         pmode = LUSTRE_IT(it)->it_lock_mode;
1085         LASSERT(pmode != 0);
1086         memcpy(&plock, lockh, sizeof(plock));
1087         LUSTRE_IT(it)->it_lock_mode = 0;
1088         LUSTRE_IT(it)->it_data = NULL;
1089         LASSERT((body->valid & OBD_MD_FID) != 0);
1090
1091         memcpy(&rdata, data, sizeof(rdata));
1092         rdata.id1 = body->id1;
1093         rdata.name = NULL;
1094         rdata.namelen = 0;
1095
1096         LUSTRE_IT(it)->it_disposition &= ~DISP_ENQ_COMPLETE;
1097         ptlrpc_req_finished(req);
1098
1099         rc = md_enqueue(lmv->tgts[id_group(&rdata.id1)].ltd_exp,
1100                         lock_type, it, lock_mode, &rdata, lockh, lmm,
1101                         lmmsize, cb_compl, cb_blocking, cb_data);
1102         ldlm_lock_decref(&plock, pmode);
1103         RETURN(rc);
1104 }
1105
1106 static int
1107 lmv_enqueue(struct obd_export *exp, int lock_type,
1108             struct lookup_intent *it, int lock_mode,
1109             struct mdc_op_data *data, struct lustre_handle *lockh,
1110             void *lmm, int lmmsize, ldlm_completion_callback cb_compl,
1111             ldlm_blocking_callback cb_blocking, void *cb_data)
1112 {
1113         struct obd_device *obd = exp->exp_obd;
1114         struct lmv_obd *lmv = &obd->u.lmv;
1115         struct lmv_obj *obj;
1116         int rc, mds;
1117         ENTRY;
1118
1119         rc = lmv_check_connect(obd);
1120         if (rc)
1121                 RETURN(rc);
1122
1123         if (data->mea1 && it->it_op == IT_UNLINK) {
1124                 rc = lmv_enqueue_slaves(exp, lock_type, it, lock_mode,
1125                                         data, lockh, lmm, lmmsize,
1126                                         cb_compl, cb_blocking, cb_data);
1127                 RETURN(rc);
1128         }
1129
1130         if (data->namelen) {
1131                 obj = lmv_grab_obj(obd, &data->id1);
1132                 if (obj) {
1133                         /* directory is splitted. look for right mds for this
1134                          * name */
1135                         mds = raw_name2idx(obj->hashtype, obj->objcount,
1136                                            (char *)data->name, data->namelen);
1137                         data->id1 = obj->objs[mds].id;
1138                         lmv_put_obj(obj);
1139                 }
1140         }
1141         CDEBUG(D_OTHER, "ENQUEUE '%s' on "DLID4"\n", LL_IT2STR(it),
1142                OLID4(&data->id1));
1143
1144         rc = md_enqueue(lmv->tgts[id_group(&data->id1)].ltd_exp,
1145                         lock_type, it, lock_mode, data, lockh, lmm,
1146                         lmmsize, cb_compl, cb_blocking, cb_data);
1147         if (rc == 0 && it->it_op == IT_OPEN)
1148                 rc = lmv_enqueue_remote(exp, lock_type, it, lock_mode,
1149                                         data, lockh, lmm, lmmsize,
1150                                         cb_compl, cb_blocking, cb_data);
1151         RETURN(rc);
1152 }
1153
1154 static int
1155 lmv_getattr_lock(struct obd_export *exp, struct lustre_id *id,
1156                  char *filename, int namelen, __u64 valid,
1157                  unsigned int ea_size, struct ptlrpc_request **request)
1158 {
1159         int rc, mds = id_group(id), loop = 0;
1160         struct obd_device *obd = exp->exp_obd;
1161         struct lmv_obd *lmv = &obd->u.lmv;
1162         struct lustre_id rid = *id;
1163         struct mds_body *body;
1164         struct lmv_obj *obj;
1165         ENTRY;
1166
1167         rc = lmv_check_connect(obd);
1168         if (rc)
1169                 RETURN(rc);
1170 repeat:
1171         LASSERT(++loop <= 2);
1172         obj = lmv_grab_obj(obd, id);
1173         if (obj) {
1174                 /* directory is splitted. look for right mds for this name */
1175                 mds = raw_name2idx(obj->hashtype, obj->objcount,
1176                                    filename, namelen - 1);
1177                 rid = obj->objs[mds].id;
1178                 lmv_put_obj(obj);
1179         }
1180
1181         CDEBUG(D_OTHER, "getattr_lock for %*s on "DLID4" -> "DLID4"\n",
1182                namelen, filename, OLID4(id), OLID4(&rid));
1183
1184         rc = md_getattr_lock(lmv->tgts[id_group(&rid)].ltd_exp,
1185                              &rid, filename, namelen,
1186                              valid == OBD_MD_FLID ? valid : valid | OBD_MD_FID,
1187                              ea_size, request);
1188         if (rc == 0) {
1189                 /*
1190                  * this could be cross-node reference. in this case all we have
1191                  * right now is lustre_id triple. we'd like to find other
1192                  * attributes.
1193                  */
1194                 body = lustre_msg_buf((*request)->rq_repmsg, 0, sizeof(*body));
1195                 LASSERT(body != NULL);
1196                 LASSERT((body->valid & OBD_MD_FID) != 0
1197                                 || body->valid == OBD_MD_FLID);
1198
1199                 if (body->valid & OBD_MD_MDS) {
1200                         struct ptlrpc_request *req = NULL;
1201
1202                         rid = body->id1;
1203                         CDEBUG(D_OTHER, "request attrs for "DLID4"\n", OLID4(&rid));
1204
1205                         rc = md_getattr_lock(lmv->tgts[id_group(&rid)].ltd_exp,
1206                                              &rid, NULL, 1, valid, ea_size, &req);
1207                         ptlrpc_req_finished(*request);
1208                         *request = req;
1209                 }
1210         } else if (rc == -ERESTART) {
1211                 /* directory got splitted. time to update local object and
1212                  * repeat the request with proper MDS */
1213                 rc = lmv_get_mea_and_update_object(exp, &rid);
1214                 if (rc == 0) {
1215                         ptlrpc_req_finished(*request);
1216                         goto repeat;
1217                 }
1218         }
1219         RETURN(rc);
1220 }
1221
1222 /*
1223  * llite passes id of an target inode in data->id1 and id of directory in
1224  * data->id2
1225  */
1226 static int lmv_link(struct obd_export *exp, struct mdc_op_data *data,
1227                     struct ptlrpc_request **request)
1228 {
1229         struct obd_device *obd = exp->exp_obd;
1230         struct lmv_obd *lmv = &obd->u.lmv;
1231         struct lmv_obj *obj;
1232         int rc, mds;
1233         ENTRY;
1234
1235         rc = lmv_check_connect(obd);
1236         if (rc)
1237                 RETURN(rc);
1238
1239         if (data->namelen != 0) {
1240                 /* usual link request */
1241                 obj = lmv_grab_obj(obd, &data->id2);
1242                 if (obj) {
1243                         rc = raw_name2idx(obj->hashtype, obj->objcount,
1244                                           data->name, data->namelen);
1245                         data->id2 = obj->objs[rc].id;
1246                         lmv_put_obj(obj);
1247                 }
1248
1249                 mds = id_group(&data->id2);
1250
1251                 CDEBUG(D_OTHER,"link "DLID4":%*s to "DLID4"\n",
1252                        OLID4(&data->id2), data->namelen, data->name,
1253                        OLID4(&data->id1));
1254         } else {
1255                 mds = id_group(&data->id1);
1256
1257                 /* request from MDS to acquire i_links for inode by id1 */
1258                 CDEBUG(D_OTHER, "inc i_nlinks for "DLID4"\n",
1259                        OLID4(&data->id1));
1260         }
1261
1262         CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n",
1263                mds, OLID4(&data->id1));
1264         rc = md_link(lmv->tgts[mds].ltd_exp, data, request);
1265
1266         RETURN(rc);
1267 }
1268
1269 static int lmv_rename(struct obd_export *exp, struct mdc_op_data *data,
1270                       const char *old, int oldlen, const char *new, int newlen,
1271                       struct ptlrpc_request **request)
1272 {
1273         struct obd_device *obd = exp->exp_obd;
1274         struct lmv_obd *lmv = &obd->u.lmv;
1275         struct lmv_obj *obj;
1276         int rc, mds;
1277         ENTRY;
1278
1279         CDEBUG(D_OTHER, "rename %*s in "DLID4" to %*s in "DLID4"\n",
1280                oldlen, old, OLID4(&data->id1), newlen, new,
1281                OLID4(&data->id2));
1282
1283         rc = lmv_check_connect(obd);
1284         if (rc)
1285                 RETURN(rc);
1286
1287         if (oldlen == 0) {
1288                 /*
1289                  * MDS with old dir entry is asking another MDS to create name
1290                  * there.
1291                  */
1292                 CDEBUG(D_OTHER,
1293                        "create %*s(%d/%d) in "DLID4" pointing "
1294                        "to "DLID4"\n", newlen, new, oldlen, newlen,
1295                        OLID4(&data->id2), OLID4(&data->id1));
1296
1297                 mds = id_group(&data->id2);
1298
1299                 /*
1300                  * target directory can be splitted, sowe should forward request
1301                  * to the right MDS.
1302                  */
1303                 obj = lmv_grab_obj(obd, &data->id2);
1304                 if (obj) {
1305                         mds = raw_name2idx(obj->hashtype, obj->objcount,
1306                                            (char *)new, newlen);
1307                         data->id2 = obj->objs[mds].id;
1308                         CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n", mds,
1309                                OLID4(&data->id2));
1310                         lmv_put_obj(obj);
1311                 }
1312                 goto request;
1313         }
1314
1315         obj = lmv_grab_obj(obd, &data->id1);
1316         if (obj) {
1317                 /*
1318                  * directory is already splitted, so we have to forward request
1319                  * to the right MDS.
1320                  */
1321                 mds = raw_name2idx(obj->hashtype, obj->objcount,
1322                                    (char *)old, oldlen);
1323                 data->id1 = obj->objs[mds].id;
1324                 CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n", mds,
1325                        OLID4(&data->id1));
1326                 lmv_put_obj(obj);
1327         }
1328
1329         obj = lmv_grab_obj(obd, &data->id2);
1330         if (obj) {
1331                 /*
1332                  * directory is already splitted, so we have to forward request
1333                  * to the right MDS.
1334                  */
1335                 mds = raw_name2idx(obj->hashtype, obj->objcount,
1336                                    (char *)new, newlen);
1337
1338                 data->id2 = obj->objs[mds].id;
1339                 CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n", mds,
1340                        OLID4(&data->id2));
1341                 lmv_put_obj(obj);
1342         }
1343
1344         mds = id_group(&data->id1);
1345
1346 request:
1347         if (id_group(&data->id1) != id_group(&data->id2)) {
1348                 CDEBUG(D_OTHER,"cross-node rename "DLID4"/%*s to "DLID4"/%*s\n",
1349                        OLID4(&data->id1), oldlen, old, OLID4(&data->id2),
1350                        newlen, new);
1351         }
1352
1353         rc = md_rename(lmv->tgts[mds].ltd_exp, data, old, oldlen,
1354                        new, newlen, request);
1355         RETURN(rc);
1356 }
1357
1358 static int lmv_setattr(struct obd_export *exp, struct mdc_op_data *data,
1359                        struct iattr *iattr, void *ea, int ealen, void *ea2,
1360                        int ea2len, struct ptlrpc_request **request)
1361 {
1362         struct obd_device *obd = exp->exp_obd;
1363         struct lmv_obd *lmv = &obd->u.lmv;
1364         struct ptlrpc_request *req;
1365         struct mds_body *body;
1366         struct lmv_obj *obj;
1367         int rc = 0, i;
1368         ENTRY;
1369
1370         rc = lmv_check_connect(obd);
1371         if (rc)
1372                 RETURN(rc);
1373
1374         obj = lmv_grab_obj(obd, &data->id1);
1375
1376         CDEBUG(D_OTHER, "SETATTR for "DLID4", valid 0x%x%s\n",
1377                OLID4(&data->id1), iattr->ia_valid, obj ? ", splitted" : "");
1378
1379         if (obj) {
1380                 for (i = 0; i < obj->objcount; i++) {
1381                         data->id1 = obj->objs[i].id;
1382
1383                         rc = md_setattr(lmv->tgts[id_group(&data->id1)].ltd_exp,
1384                                         data, iattr, ea, ealen, ea2, ea2len, &req);
1385
1386                         if (id_equal_fid(&obj->id, &obj->objs[i].id)) {
1387                                 /*
1388                                  * this is master object and this request should
1389                                  * be returned back to llite.
1390                                  */
1391                                 *request = req;
1392                         } else {
1393                                 ptlrpc_req_finished(req);
1394                         }
1395
1396                         if (rc)
1397                                 break;
1398                 }
1399                 lmv_put_obj(obj);
1400         } else {
1401                 LASSERT(id_group(&data->id1) < lmv->desc.ld_tgt_count);
1402                 rc = md_setattr(lmv->tgts[id_group(&data->id1)].ltd_exp,
1403                                 data, iattr, ea, ealen, ea2, ea2len, request);
1404                 if (rc == 0) {
1405                         body = lustre_msg_buf((*request)->rq_repmsg, 0,
1406                                               sizeof(*body));
1407                         LASSERT(body != NULL);
1408                         LASSERT((body->valid & OBD_MD_FID) != 0);
1409                         LASSERT(id_group(&body->id1) == id_group(&data->id1));
1410                 }
1411         }
1412         RETURN(rc);
1413 }
1414
1415 static int lmv_sync(struct obd_export *exp, struct lustre_id *id,
1416                     struct ptlrpc_request **request)
1417 {
1418         struct obd_device *obd = exp->exp_obd;
1419         struct lmv_obd *lmv = &obd->u.lmv;
1420         int rc;
1421         ENTRY;
1422
1423         rc = lmv_check_connect(obd);
1424         if (rc)
1425                 RETURN(rc);
1426
1427         rc = md_sync(lmv->tgts[id_group(id)].ltd_exp,
1428                      id, request);
1429         RETURN(rc);
1430 }
1431
1432 int lmv_dirobj_blocking_ast(struct ldlm_lock *lock,
1433                             struct ldlm_lock_desc *desc,
1434                             void *data, int flag)
1435 {
1436         struct lustre_handle lockh;
1437         struct lmv_obj *obj;
1438         int rc;
1439         ENTRY;
1440
1441         switch (flag) {
1442         case LDLM_CB_BLOCKING:
1443                 ldlm_lock2handle(lock, &lockh);
1444                 rc = ldlm_cli_cancel(&lockh);
1445                 if (rc < 0) {
1446                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
1447                         RETURN(rc);
1448                 }
1449                 break;
1450         case LDLM_CB_CANCELING:
1451                 /* time to drop cached attrs for dirobj */
1452                 obj = lock->l_ast_data;
1453                 if (obj) {
1454                         CDEBUG(D_OTHER, "cancel %s on "LPU64"/"LPU64
1455                                ", master "DLID4"\n",
1456                                lock->l_resource->lr_name.name[3] == 1 ?
1457                                "LOOKUP" : "UPDATE",
1458                                lock->l_resource->lr_name.name[0],
1459                                lock->l_resource->lr_name.name[1],
1460                                OLID4(&obj->id));
1461                         lmv_put_obj(obj);
1462                 }
1463                 break;
1464         default:
1465                 LBUG();
1466         }
1467         RETURN(0);
1468 }
1469
1470 static void lmv_remove_dots(struct page *page)
1471 {
1472         unsigned limit = PAGE_CACHE_SIZE;
1473         char *kaddr = page_address(page);
1474         struct ext2_dir_entry_2 *p;
1475         unsigned offs, rec_len;
1476
1477         for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
1478                 p = (struct ext2_dir_entry_2 *)(kaddr + offs);
1479                 rec_len = le16_to_cpu(p->rec_len);
1480
1481                 if ((p->name_len == 1 && p->name[0] == '.') ||
1482                     (p->name_len == 2 && p->name[0] == '.' && p->name[1] == '.'))
1483                         p->inode = 0;
1484         }
1485 }
1486
1487 static int lmv_readpage(struct obd_export *exp, struct lustre_id *id,
1488                         __u64 offset, struct page *page,
1489                         struct ptlrpc_request **request)
1490 {
1491         struct obd_device *obd = exp->exp_obd;
1492         struct lmv_obd *lmv = &obd->u.lmv;
1493         struct lustre_id rid = *id;
1494         struct lmv_obj *obj;
1495         int rc, i;
1496         ENTRY;
1497
1498 #warning "we need well-desgined readdir() implementation"
1499         rc = lmv_check_connect(obd);
1500         if (rc)
1501                 RETURN(rc);
1502
1503         LASSERT(id_group(id) < lmv->desc.ld_tgt_count);
1504         CDEBUG(D_OTHER, "READPAGE at %llu from "DLID4"\n",
1505                offset, OLID4(&rid));
1506
1507         obj = lmv_grab_obj(obd, id);
1508         if (obj) {
1509                 lmv_lock_obj(obj);
1510
1511                 /* find dirobj containing page with requested offset. */
1512                 for (i = 0; i < obj->objcount; i++) {
1513                         if (offset < obj->objs[i].size)
1514                                 break;
1515                         offset -= obj->objs[i].size;
1516                 }
1517                 rid = obj->objs[i].id;
1518
1519                 lmv_unlock_obj(obj);
1520                 lmv_put_obj(obj);
1521
1522                 CDEBUG(D_OTHER, "forward to "DLID4" with offset %lu\n",
1523                        OLID4(&rid), (unsigned long)offset);
1524         }
1525         rc = md_readpage(lmv->tgts[id_group(&rid)].ltd_exp, &rid,
1526                          offset, page, request);
1527
1528         if (rc == 0 && !id_equal_fid(&rid, id))
1529                 /* this page isn't from master object. To avoid "." and ".."
1530                  * duplication in directory, we have to remove them from all
1531                  * slave objects */
1532                 lmv_remove_dots(page);
1533
1534         RETURN(rc);
1535 }
1536
1537 static int lmv_unlink_slaves(struct obd_export *exp, struct mdc_op_data *data,
1538                              struct ptlrpc_request **req)
1539 {
1540         struct obd_device *obd = exp->exp_obd;
1541         struct lmv_obd *lmv = &obd->u.lmv;
1542         struct mea *mea = data->mea1;
1543         struct mdc_op_data *data2;
1544         int i, rc = 0;
1545         ENTRY;
1546
1547         OBD_ALLOC(data2, sizeof(*data2));
1548         if (data2 == NULL)
1549                 RETURN(-ENOMEM);
1550
1551         LASSERT(mea != NULL);
1552         for (i = 0; i < mea->mea_count; i++) {
1553                 memset(data2, 0, sizeof(*data2));
1554                 data2->id1 = mea->mea_ids[i];
1555                 data2->create_mode = MDS_MODE_DONT_LOCK | S_IFDIR;
1556
1557                 if (lmv->tgts[id_group(&data2->id1)].ltd_exp == NULL)
1558                         continue;
1559
1560                 rc = md_unlink(lmv->tgts[id_group(&data2->id1)].ltd_exp,
1561                                data2, req);
1562
1563                 CDEBUG(D_OTHER, "unlink slave "DLID4" -> %d\n",
1564                        OLID4(&mea->mea_ids[i]), rc);
1565
1566                 if (*req) {
1567                         ptlrpc_req_finished(*req);
1568                         *req = NULL;
1569                 }
1570                 if (rc)
1571                         RETURN(rc);
1572         }
1573         OBD_FREE(data2, sizeof(*data2));
1574         RETURN(rc);
1575 }
1576
1577 static int lmv_delete_inode(struct obd_export *exp, struct lustre_id *id)
1578 {
1579         ENTRY;
1580
1581         LASSERT(exp && id);
1582         if (lmv_delete_obj(exp, id)) {
1583                 CDEBUG(D_OTHER, "lmv object "DLID4" is destroyed.\n",
1584                        OLID4(id));
1585         }
1586         RETURN(0);
1587 }
1588
1589 static int lmv_unlink(struct obd_export *exp, struct mdc_op_data *data,
1590                       struct ptlrpc_request **request)
1591 {
1592         struct obd_device *obd = exp->exp_obd;
1593         struct lmv_obd *lmv = &obd->u.lmv;
1594         int rc, i = 0;
1595         ENTRY;
1596
1597         rc = lmv_check_connect(obd);
1598         if (rc)
1599                 RETURN(rc);
1600
1601         if (data->namelen == 0 && data->mea1 != NULL) {
1602                 /* mds asks to remove slave objects */
1603                 rc = lmv_unlink_slaves(exp, data, request);
1604                 RETURN(rc);
1605         }
1606
1607         if (data->namelen != 0) {
1608                 struct lmv_obj *obj;
1609
1610                 obj = lmv_grab_obj(obd, &data->id1);
1611                 if (obj) {
1612                         i = raw_name2idx(obj->hashtype, obj->objcount,
1613                                          data->name, data->namelen);
1614                         data->id1 = obj->objs[i].id;
1615                         lmv_put_obj(obj);
1616                 }
1617                 CDEBUG(D_OTHER, "unlink '%*s' in "DLID4" -> %u\n",
1618                        data->namelen, data->name, OLID4(&data->id1),
1619                        i);
1620         } else {
1621                 CDEBUG(D_OTHER, "drop i_nlink on "DLID4"\n",
1622                        OLID4(&data->id1));
1623         }
1624         rc = md_unlink(lmv->tgts[id_group(&data->id1)].ltd_exp,
1625                        data, request);
1626         RETURN(rc);
1627 }
1628
1629 static struct obd_device *lmv_get_real_obd(struct obd_export *exp,
1630                                            struct lustre_id *id)
1631 {
1632         struct obd_device *obd = exp->exp_obd;
1633         struct lmv_obd *lmv = &obd->u.lmv;
1634         int rc;
1635         ENTRY;
1636
1637         rc = lmv_check_connect(obd);
1638         if (rc)
1639                 RETURN(ERR_PTR(rc));
1640         obd = lmv->tgts[id_group(id)].ltd_exp->exp_obd;
1641         EXIT;
1642
1643         return obd;
1644 }
1645
1646 static int lmv_init_ea_size(struct obd_export *exp, int easize,
1647                             int cookiesize)
1648 {
1649         struct obd_device *obd = exp->exp_obd;
1650         struct lmv_obd *lmv = &obd->u.lmv;
1651         int i, rc = 0, change = 0;
1652         ENTRY;
1653
1654         if (lmv->max_easize < easize) {
1655                 lmv->max_easize = easize;
1656                 change = 1;
1657         }
1658         if (lmv->max_cookiesize < cookiesize) {
1659                 lmv->max_cookiesize = cookiesize;
1660                 change = 1;
1661         }
1662         if (change == 0)
1663                 RETURN(0);
1664
1665         if (lmv->connected == 0)
1666                 RETURN(0);
1667
1668         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1669                 if (lmv->tgts[i].ltd_exp == NULL) {
1670                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
1671                         continue;
1672                 }
1673
1674                 rc = obd_init_ea_size(lmv->tgts[i].ltd_exp, easize, cookiesize);
1675                 if (rc) {
1676                         CERROR("obd_init_ea_size() failed on MDT target %d, "
1677                                "error %d.\n", i, rc);
1678                         break;
1679                 }
1680         }
1681         RETURN(rc);
1682 }
1683
1684 static int lmv_obd_create_single(struct obd_export *exp, struct obdo *oa,
1685                                  void *acl, int acl_size,
1686                                  struct lov_stripe_md **ea,
1687                                  struct obd_trans_info *oti)
1688 {
1689         struct obd_device *obd = exp->exp_obd;
1690         struct lmv_obd *lmv = &obd->u.lmv;
1691         struct lov_stripe_md obj_md;
1692         struct lov_stripe_md *obj_mdp = &obj_md;
1693         int rc = 0;
1694         ENTRY;
1695
1696         LASSERT(ea == NULL);
1697         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1698
1699         rc = obd_create(lmv->tgts[oa->o_mds].ltd_exp, oa,
1700                         acl, acl_size, &obj_mdp, oti);
1701
1702         RETURN(rc);
1703 }
1704
1705 /*
1706  * to be called from MDS only. @oa should have correct store cookie and o_fid
1707  * values for "master" object, as it will be used.
1708  */
1709 int lmv_obd_create(struct obd_export *exp, struct obdo *oa,
1710                    void *acl, int acl_size,
1711                    struct lov_stripe_md **ea, struct obd_trans_info *oti)
1712 {
1713         struct obd_device *obd = exp->exp_obd;
1714         struct lmv_obd *lmv = &obd->u.lmv;
1715         struct lustre_id mid;
1716         int i, c, rc = 0;
1717         struct mea *mea;
1718         ENTRY;
1719
1720         rc = lmv_check_connect(obd);
1721         if (rc)
1722                 RETURN(rc);
1723
1724         LASSERT(oa != NULL);
1725
1726         if (ea == NULL) {
1727                 rc = lmv_obd_create_single(exp, oa, acl, acl_size, NULL, oti);
1728                 if (rc)
1729                         CERROR("Can't create object, rc = %d\n", rc);
1730                 RETURN(rc);
1731         }
1732
1733         /* acl is only suppied when mds create single remote obj */
1734         LASSERT(acl == NULL && acl_size == 0);
1735
1736         if (*ea == NULL) {
1737                 rc = obd_alloc_diskmd(exp, (struct lov_mds_md **)ea);
1738                 if (rc < 0) {
1739                         CERROR("obd_alloc_diskmd() failed, error %d\n",
1740                                rc);
1741                         RETURN(rc);
1742                 } else
1743                         rc = 0;
1744
1745                 if (*ea == NULL)
1746                         RETURN(-ENOMEM);
1747         }
1748
1749         /*
1750          * here we should take care about splitted dir, so store cookie and fid
1751          * for "master" object should already be allocated and passed in @oa.
1752          */
1753         LASSERT(oa->o_id != 0);
1754         LASSERT(oa->o_fid != 0);
1755
1756         /* save "master" object id */
1757         obdo2id(&mid, oa);
1758
1759         mea = (struct mea *)*ea;
1760         mea->mea_master = -1;
1761         mea->mea_magic = MEA_MAGIC_ALL_CHARS;
1762
1763         if (!mea->mea_count || mea->mea_count > lmv->desc.ld_tgt_count)
1764                 mea->mea_count = lmv->desc.ld_tgt_count;
1765
1766         for (i = 0, c = 0; c < mea->mea_count && i < lmv->desc.ld_tgt_count; i++) {
1767                 struct lov_stripe_md obj_md;
1768                 struct lov_stripe_md *obj_mdp = &obj_md;
1769
1770                 if (lmv->tgts[i].ltd_exp == NULL) {
1771                         /* this is "master" MDS */
1772                         mea->mea_master = i;
1773                         mea->mea_ids[c] = mid;
1774                         c++;
1775                         continue;
1776                 }
1777
1778                 /*
1779                  * "master" MDS should always be part of stripped dir,
1780                  * so scan for it.
1781                  */
1782                 if (mea->mea_master == -1 && c == mea->mea_count - 1)
1783                         continue;
1784
1785                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLTYPE | OBD_MD_FLMODE |
1786                         OBD_MD_FLUID | OBD_MD_FLGID | OBD_MD_FLID;
1787
1788                 rc = obd_create(lmv->tgts[c].ltd_exp, oa, NULL, 0,
1789                                 &obj_mdp, oti);
1790                 if (rc) {
1791                         CERROR("obd_create() failed on MDT target %d, "
1792                                "error %d\n", c, rc);
1793                         RETURN(rc);
1794                 }
1795
1796                 CDEBUG(D_OTHER, "dirobj at mds %d: "LPU64"/%u\n",
1797                        i, oa->o_id, oa->o_generation);
1798
1799
1800                 /*
1801                  * here, when object is created (or it is master and was passed
1802                  * from caller) on desired MDS we save its fid to local mea_ids.
1803                  */
1804                 LASSERT(oa->o_fid);
1805
1806                 /*
1807                  * store cookie should be defined here for both cases (master
1808                  * object and not master), because master is already created.
1809                  */
1810                 LASSERT(oa->o_id);
1811
1812                 /* fill mea by store cookie and fid */
1813                 obdo2id(&mea->mea_ids[c], oa);
1814                 c++;
1815         }
1816         LASSERT(c == mea->mea_count);
1817
1818         CDEBUG(D_OTHER, "%d dirobjects created\n",
1819                (int)mea->mea_count);
1820
1821         RETURN(rc);
1822 }
1823
1824 static int lmv_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
1825                          struct obd_device *tgt, int count,
1826                          struct llog_catid *logid)
1827 {
1828         struct llog_ctxt *ctxt;
1829         int rc;
1830         ENTRY;
1831
1832         rc = obd_llog_setup(obd, llogs, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
1833                             &llog_client_ops);
1834         if (rc == 0) {
1835                 ctxt = llog_get_context(llogs, LLOG_CONFIG_REPL_CTXT);
1836                 ctxt->loc_imp = tgt->u.cli.cl_import;
1837         }
1838
1839         RETURN(rc);
1840 }
1841
1842 static int lmv_llog_finish(struct obd_device *obd,
1843                            struct obd_llogs *llogs, int count)
1844 {
1845         int rc;
1846         ENTRY;
1847
1848         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_CONFIG_REPL_CTXT));
1849         RETURN(rc);
1850 }
1851
1852 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
1853                         void *key, __u32 *vallen, void *val)
1854 {
1855         struct obd_device *obd;
1856         struct lmv_obd *lmv;
1857         int rc = 0;
1858         ENTRY;
1859
1860         obd = class_exp2obd(exp);
1861         if (obd == NULL) {
1862                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1863                        exp->exp_handle.h_cookie);
1864                 RETURN(-EINVAL);
1865         }
1866
1867         lmv = &obd->u.lmv;
1868         if (keylen == 6 && memcmp(key, "mdsize", 6) == 0) {
1869                 __u32 *mdsize = val;
1870                 *vallen = sizeof(__u32);
1871                 *mdsize = sizeof(struct lustre_id) * lmv->desc.ld_tgt_count
1872                         + sizeof(struct mea);
1873                 RETURN(0);
1874         } else if (keylen == 6 && memcmp(key, "mdsnum", 6) == 0) {
1875                 struct obd_uuid *cluuid = &lmv->cluuid;
1876                 struct lmv_tgt_desc *tgts;
1877                 __u32 *mdsnum = val;
1878                 int i;
1879
1880                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
1881                         if (obd_uuid_equals(&tgts->uuid, cluuid)) {
1882                                 *vallen = sizeof(__u32);
1883                                 *mdsnum = i;
1884                                 RETURN(0);
1885                         }
1886                 }
1887                 LASSERT(0);
1888         } else if (keylen == 6 && memcmp(key, "rootid", 6) == 0) {
1889                 rc = lmv_check_connect(obd);
1890                 if (rc)
1891                         RETURN(rc);
1892
1893                 /* getting rootid from first MDS. */
1894                 rc = obd_get_info(lmv->tgts[0].ltd_exp, keylen, key,
1895                                   vallen, val);
1896                 RETURN(rc);
1897         } else if (keylen >= strlen("lmvdesc") && strcmp(key, "lmvdesc") == 0) {
1898                 struct lmv_desc *desc_ret = val;
1899                 *desc_ret = lmv->desc;
1900                 RETURN(0);
1901         } else if (keylen == strlen("remote_flag") &&
1902                    !strcmp(key, "remote_flag")) {
1903                 struct lmv_tgt_desc *tgts;
1904                 int i;
1905
1906                 rc = lmv_check_connect(obd);
1907                 if (rc)
1908                         RETURN(rc);
1909
1910                 LASSERT(*vallen == sizeof(__u32));
1911                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count;
1912                      i++, tgts++) {
1913
1914                         /* all tgts should be connected when this get called. */
1915                         if (!tgts || !tgts->ltd_exp) {
1916                                 CERROR("target not setup?\n");
1917                                 continue;
1918                         }
1919
1920                         if (!obd_get_info(tgts->ltd_exp, keylen, key,
1921                                           vallen, val))
1922                                 RETURN(0);
1923                 }
1924                 RETURN(-EINVAL);
1925         } else if (keylen >= strlen("lovdesc") && strcmp(key, "lovdesc") == 0) {
1926                 rc = lmv_check_connect(obd);
1927                 if (rc)
1928                         RETURN(rc);
1929
1930                 /* forwarding this request to first MDS, it should know LOV
1931                  * desc. */
1932                 rc = obd_get_info(lmv->tgts[0].ltd_exp, keylen, key,
1933                                   vallen, val);
1934                 RETURN(rc);
1935         }
1936
1937         CDEBUG(D_IOCTL, "invalid key\n");
1938         RETURN(-EINVAL);
1939 }
1940
1941 int lmv_set_info(struct obd_export *exp, obd_count keylen,
1942                  void *key, obd_count vallen, void *val)
1943 {
1944         struct lmv_tgt_desc    *tgt;
1945         struct obd_device      *obd;
1946         struct lmv_obd         *lmv;
1947         ENTRY;
1948
1949         obd = class_exp2obd(exp);
1950         if (obd == NULL) {
1951                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1952                        exp->exp_handle.h_cookie);
1953                 RETURN(-EINVAL);
1954         }
1955         lmv = &obd->u.lmv;
1956
1957         if (keylen >= strlen("inter_mds") && strcmp(key, "inter_mds") == 0) {
1958                 lmv->server_timeout = 1;
1959                 lmv_set_timeouts(obd);
1960                 RETURN(0);
1961         }
1962
1963         /* maybe this could be default */
1964         if ((keylen == strlen("sec") && strcmp(key, "sec") == 0) ||
1965             (keylen == strlen("sec_flags") && strcmp(key, "sec_flags") == 0) ||
1966             (keylen == strlen("nllu") && strcmp(key, "nllu") == 0)) {
1967                 struct obd_export *exp;
1968                 int rc = 0, err, i;
1969
1970                 spin_lock(&lmv->lmv_lock);
1971                 for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count;
1972                      i++, tgt++) {
1973                         exp = tgt->ltd_exp;
1974                         /* during setup time the connections to mdc might
1975                          * haven't been established.
1976                          */
1977                         if (exp == NULL) {
1978                                 struct obd_device *tgt_obd;
1979
1980                                 tgt_obd = class_find_client_obd(&tgt->uuid,
1981                                                                 OBD_MDC_DEVICENAME,
1982                                                                 &obd->obd_uuid);
1983                                 if (!tgt_obd) {
1984                                         CERROR("can't set info %s, "
1985                                                "device %s not attached?\n",
1986                                                 (char *) key, tgt->uuid.uuid);
1987                                         rc = -EINVAL;
1988                                         continue;
1989                                 }
1990                                 exp = tgt_obd->obd_self_export;
1991                         }
1992
1993                         err = obd_set_info(exp, keylen, key, vallen, val);
1994                         if (!rc)
1995                                 rc = err;
1996                 }
1997                 spin_unlock(&lmv->lmv_lock);
1998
1999                 RETURN(rc);
2000         }
2001
2002         if ((keylen == strlen("flush_cred") &&
2003              strcmp(key, "flush_cred") == 0)) {
2004                 int rc = 0, i;
2005
2006                 for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count;
2007                      i++, tgt++) {
2008                         if (!tgt->ltd_exp)
2009                                 continue;
2010                         rc = obd_set_info(tgt->ltd_exp,
2011                                           keylen, key, vallen, val);
2012                         if (rc)
2013                                 RETURN(rc);
2014                 }
2015
2016                 RETURN(0);
2017         }
2018
2019         RETURN(-EINVAL);
2020 }
2021
2022 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
2023                struct lov_stripe_md *lsm)
2024 {
2025         struct obd_device *obd = class_exp2obd(exp);
2026         struct lmv_obd *lmv = &obd->u.lmv;
2027         struct mea *meap, *lsmp;
2028         int mea_size, i;
2029         ENTRY;
2030
2031         mea_size = (sizeof(struct lustre_id) *
2032                     lmv->desc.ld_tgt_count) + sizeof(struct mea);
2033         if (!lmmp)
2034                 RETURN(mea_size);
2035
2036         if (*lmmp && !lsm) {
2037                 OBD_FREE(*lmmp, mea_size);
2038                 *lmmp = NULL;
2039                 RETURN(0);
2040         }
2041
2042         if (*lmmp == NULL) {
2043                 OBD_ALLOC(*lmmp, mea_size);
2044                 if (*lmmp == NULL)
2045                         RETURN(-ENOMEM);
2046         }
2047
2048         if (!lsm)
2049                 RETURN(mea_size);
2050
2051         lsmp = (struct mea *)lsm;
2052         meap = (struct mea *)*lmmp;
2053
2054         if (lsmp->mea_magic != MEA_MAGIC_LAST_CHAR &&
2055             lsmp->mea_magic != MEA_MAGIC_ALL_CHARS)
2056                 RETURN(-EINVAL);
2057
2058         meap->mea_magic = cpu_to_le32(lsmp->mea_magic);
2059         meap->mea_count = cpu_to_le32(lsmp->mea_count);
2060         meap->mea_master = cpu_to_le32(lsmp->mea_master);
2061
2062         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2063                 meap->mea_ids[i] = meap->mea_ids[i];
2064                 id_cpu_to_le(&meap->mea_ids[i]);
2065         }
2066
2067         RETURN(mea_size);
2068 }
2069
2070 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2071                  struct lov_mds_md *lmm, int lmm_size)
2072 {
2073         struct obd_device *obd = class_exp2obd(exp);
2074         struct mea **tmea = (struct mea **)lsmp;
2075         struct mea *mea = (struct mea *)lmm;
2076         struct lmv_obd *lmv = &obd->u.lmv;
2077         int mea_size, i, rc = 0;
2078         __u32 magic;
2079         ENTRY;
2080
2081         mea_size = sizeof(struct lustre_id) *
2082                 lmv->desc.ld_tgt_count + sizeof(struct mea);
2083
2084         if (lsmp == NULL)
2085                 return mea_size;
2086
2087         if (*lsmp != NULL && lmm == NULL) {
2088                 OBD_FREE(*tmea, mea_size);
2089                 RETURN(0);
2090         }
2091
2092         LASSERT(mea_size == lmm_size);
2093
2094         OBD_ALLOC(*tmea, mea_size);
2095         if (*tmea == NULL)
2096                 RETURN(-ENOMEM);
2097
2098         if (!lmm)
2099                 RETURN(mea_size);
2100
2101         if (mea->mea_magic == MEA_MAGIC_LAST_CHAR ||
2102             mea->mea_magic == MEA_MAGIC_ALL_CHARS)
2103         {
2104                 magic = le32_to_cpu(mea->mea_magic);
2105         } else {
2106                 struct mea_old *old = (struct mea_old *)lmm;
2107
2108                 mea_size = sizeof(struct lustre_id) * old->mea_count +
2109                         sizeof(struct mea_old);
2110
2111                 if (old->mea_count > 256 || old->mea_master > 256 ||
2112                     lmm_size < mea_size || old->mea_master > old->mea_count) {
2113                         CWARN("bad MEA: count %u, master %u, size %u\n",
2114                               old->mea_count, old->mea_master, mea_size);
2115                         GOTO(out_free_mea, rc = -EINVAL);
2116                 }
2117                 magic = MEA_MAGIC_LAST_CHAR;
2118         }
2119
2120         (*tmea)->mea_magic = magic;
2121         (*tmea)->mea_count = le32_to_cpu(mea->mea_count);
2122         (*tmea)->mea_master = le32_to_cpu(mea->mea_master);
2123
2124         for (i = 0; i < (*tmea)->mea_count; i++) {
2125                 (*tmea)->mea_ids[i] = mea->mea_ids[i];
2126                 id_le_to_cpu(&(*tmea)->mea_ids[i]);
2127         }
2128         RETURN(mea_size);
2129
2130 out_free_mea:
2131         OBD_FREE(*tmea, mea_size);
2132         return rc;
2133 }
2134
2135 int lmv_brw(int rw, struct obd_export *exp, struct obdo *oa,
2136             struct lov_stripe_md *ea, obd_count oa_bufs,
2137             struct brw_page *pgarr, struct obd_trans_info *oti)
2138 {
2139         struct obd_device *obd = exp->exp_obd;
2140         struct lmv_obd *lmv = &obd->u.lmv;
2141         struct mea *mea = (struct mea *) ea;
2142         int err;
2143
2144         LASSERT(oa != NULL);
2145         LASSERT(ea != NULL);
2146         LASSERT(pgarr != NULL);
2147         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
2148
2149         oa->o_gr = id_gen(&mea->mea_ids[oa->o_mds]);
2150         oa->o_id = id_ino(&mea->mea_ids[oa->o_mds]);
2151         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
2152
2153         err = obd_brw(rw, lmv->tgts[oa->o_mds].ltd_exp,
2154                       oa, NULL, oa_bufs, pgarr, oti);
2155         RETURN(err);
2156 }
2157
2158 static int lmv_cancel_unused(struct obd_export *exp,
2159                              struct lov_stripe_md *lsm,
2160                              int flags, void *opaque)
2161 {
2162         struct obd_device *obd = exp->exp_obd;
2163         struct lmv_obd *lmv = &obd->u.lmv;
2164         int rc = 0, err, i;
2165         ENTRY;
2166
2167         LASSERT(lsm == NULL);
2168
2169         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2170                 if (!lmv->tgts[i].ltd_exp || !lmv->tgts[i].active)
2171                         continue;
2172
2173                 err = obd_cancel_unused(lmv->tgts[i].ltd_exp,
2174                                         NULL, flags, opaque);
2175                 if (!rc)
2176                         rc = err;
2177         }
2178         RETURN(rc);
2179 }
2180
2181 struct obd_ops lmv_obd_ops = {
2182         .o_owner                = THIS_MODULE,
2183         .o_attach               = lmv_attach,
2184         .o_detach               = lmv_detach,
2185         .o_setup                = lmv_setup,
2186         .o_cleanup              = lmv_cleanup,
2187         .o_connect              = lmv_connect,
2188         .o_disconnect           = lmv_disconnect,
2189         .o_statfs               = lmv_statfs,
2190         .o_llog_init            = lmv_llog_init,
2191         .o_llog_finish          = lmv_llog_finish,
2192         .o_get_info             = lmv_get_info,
2193         .o_set_info             = lmv_set_info,
2194         .o_create               = lmv_obd_create,
2195         .o_packmd               = lmv_packmd,
2196         .o_unpackmd             = lmv_unpackmd,
2197         .o_brw                  = lmv_brw,
2198         .o_init_ea_size         = lmv_init_ea_size,
2199         .o_notify               = lmv_notify,
2200         .o_iocontrol            = lmv_iocontrol,
2201         .o_cancel_unused        = lmv_cancel_unused,
2202 };
2203
2204 struct md_ops lmv_md_ops = {
2205         .m_getstatus           = lmv_getstatus,
2206         .m_getattr             = lmv_getattr,
2207         .m_change_cbdata       = lmv_change_cbdata,
2208         .m_change_cbdata_name  = lmv_change_cbdata_name,
2209         .m_close               = lmv_close,
2210         .m_create              = lmv_create,
2211         .m_done_writing        = lmv_done_writing,
2212         .m_enqueue             = lmv_enqueue,
2213         .m_getattr_lock        = lmv_getattr_lock,
2214         .m_intent_lock         = lmv_intent_lock,
2215         .m_link                = lmv_link,
2216         .m_rename              = lmv_rename,
2217         .m_setattr             = lmv_setattr,
2218         .m_sync                = lmv_sync,
2219         .m_readpage            = lmv_readpage,
2220         .m_unlink              = lmv_unlink,
2221         .m_get_real_obd        = lmv_get_real_obd,
2222         .m_valid_attrs         = lmv_valid_attrs,
2223         .m_delete_inode        = lmv_delete_inode,
2224         .m_access_check        = lmv_access_check,
2225 };
2226
2227 int __init lmv_init(void)
2228 {
2229         struct lprocfs_static_vars lvars;
2230         int rc;
2231
2232         obj_cache = kmem_cache_create("lmv_objects",
2233                                       sizeof(struct lmv_obj),
2234                                       0, 0, NULL, NULL);
2235         if (!obj_cache) {
2236                 CERROR("error allocating lmv objects cache\n");
2237                 return -ENOMEM;
2238         }
2239
2240         lprocfs_init_vars(lmv, &lvars);
2241         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
2242                                  lvars.module_vars,
2243                                  OBD_LMV_DEVICENAME);
2244         if (rc)
2245                 kmem_cache_destroy(obj_cache);
2246
2247         return rc;
2248 }
2249
2250 #ifdef __KERNEL__
2251 static void lmv_exit(void)
2252 {
2253         class_unregister_type(OBD_LMV_DEVICENAME);
2254
2255         LASSERTF(kmem_cache_destroy(obj_cache) == 0,
2256                  "can't free lmv objects cache, %d object(s)"
2257                  "still in use\n", atomic_read(&obj_cache_count));
2258 }
2259
2260 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2261 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
2262 MODULE_LICENSE("GPL");
2263
2264 module_init(lmv_init);
2265 module_exit(lmv_exit);
2266 #endif