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, 2004, 2005, 2006 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 <linux/mm.h>
  33 #include <asm/div64.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/namei.h>
  36 #else
  37 #include <liblustre.h>
  38 #endif
  39
  40 #include <linux/ext2_fs.h>
  41
  42 #include <lustre/lustre_idl.h>
  43 #include <lustre_log.h>
  44 #include <obd_support.h>
  45 #include <lustre_lib.h>
  46 #include <lustre_net.h>
  47 #include <obd_class.h>
  48 #include <lprocfs_status.h>
  49 #include <lustre_lite.h>
  50 #include <lustre_fid.h>
  51 #include "lmv_internal.h"
  52
  53 /* not defined for liblustre building */
  54 #if !defined(ATOMIC_INIT)
  55 #define ATOMIC_INIT(val) { (val) }
  56 #endif
  57
  58 /* object cache. */
  59 cfs_mem_cache_t *obj_cache;
  60 atomic_t obj_cache_count = ATOMIC_INIT(0);
  61
  62 static void lmv_activate_target(struct lmv_obd *lmv,
  63                                 struct lmv_tgt_desc *tgt,
  64                                 int activate)
  65 {
  66         if (tgt->ltd_active == activate)
  67                 return;
  68
  69         tgt->ltd_active = activate;
  70         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  71 }
  72
  73 /* Error codes:
  74  *
  75  *  -EINVAL  : UUID can't be found in the LMV's target list
  76  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  77  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  78  */
  79 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
  80                               int activate)
  81 {
  82         struct lmv_tgt_desc *tgt;
  83         struct obd_device *obd;
  84         int i, rc = 0;
  85         ENTRY;
  86
  87         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  88                lmv, uuid->uuid, activate);
  89
  90         spin_lock(&lmv->lmv_lock);
  91         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
  92                 if (tgt->ltd_exp == NULL)
  93                         continue;
  94
  95                 CDEBUG(D_INFO, "lmv idx %d is %s conn "LPX64"\n",
  96                        i, tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
  97
  98                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
  99                         break;
 100         }
 101
 102         if (i == lmv->desc.ld_tgt_count)
 103                 GOTO(out_lmv_lock, rc = -EINVAL);
 104
 105         obd = class_exp2obd(tgt->ltd_exp);
 106         if (obd == NULL)
 107                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 108
 109         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 110                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 111                obd->obd_type->typ_name, i);
 112         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 113
 114         if (tgt->ltd_active == activate) {
 115                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 116                        activate ? "" : "in");
 117                 GOTO(out_lmv_lock, rc);
 118         }
 119
 120         CDEBUG(D_INFO, "Marking OBD %p %sactive\n",
 121                obd, activate ? "" : "in");
 122
 123         lmv_activate_target(lmv, tgt, activate);
 124
 125         EXIT;
 126
 127  out_lmv_lock:
 128         spin_unlock(&lmv->lmv_lock);
 129         return rc;
 130 }
 131
 132 static int lmv_set_mdc_data(struct lmv_obd *lmv, struct obd_uuid *uuid,
 133                             struct obd_connect_data *data)
 134 {
 135         struct lmv_tgt_desc *tgt;
 136         int i;
 137         ENTRY;
 138
 139         LASSERT(data != NULL);
 140
 141         spin_lock(&lmv->lmv_lock);
 142         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 143                 if (tgt->ltd_exp == NULL)
 144                         continue;
 145
 146                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 147                         lmv->datas[tgt->ltd_idx] = *data;
 148                         break;
 149                 }
 150         }
 151         spin_unlock(&lmv->lmv_lock);
 152         RETURN(0);
 153 }
 154
 155 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 156                       enum obd_notify_event ev, void *data)
 157 {
 158         struct lmv_obd *lmv = &obd->u.lmv;
 159         struct obd_uuid *uuid;
 160         int rc = 0;
 161         ENTRY;
 162
 163         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 164                 CERROR("unexpected notification of %s %s!\n",
 165                        watched->obd_type->typ_name,
 166                        watched->obd_name);
 167                 RETURN(-EINVAL);
 168         }
 169
 170         uuid = &watched->u.cli.cl_target_uuid;
 171         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 172                 /*
 173                  * Set MDC as active before notifying the observer, so the
 174                  * observer can use the MDC normally.
 175                  */
 176                 rc = lmv_set_mdc_active(lmv, uuid,
 177                                         ev == OBD_NOTIFY_ACTIVE);
 178                 if (rc) {
 179                         CERROR("%sactivation of %s failed: %d\n",
 180                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 181                                uuid->uuid, rc);
 182                         RETURN(rc);
 183                 }
 184         } else if (ev == OBD_NOTIFY_OCD) {
 185                 struct obd_connect_data *conn_data =
 186                         &watched->u.cli.cl_import->imp_connect_data;
 187
 188                 /* Set connect data to desired target, update
 189                  * exp_connect_flags. */
 190                 rc = lmv_set_mdc_data(lmv, uuid, conn_data);
 191                 if (rc) {
 192                         CERROR("can't set connect data to target %s, rc %d\n",
 193                                uuid->uuid, rc);
 194                         RETURN(rc);
 195                 }
 196
 197                 /*
 198                  * XXX: Make sure that ocd_connect_flags from all targets are
 199                  * the same. Otherwise one of MDTs runs wrong version or
 200                  * something like this.  --umka
 201                  */
 202                 obd->obd_self_export->exp_connect_flags =
 203                         conn_data->ocd_connect_flags;
 204         }
 205 #if 0
 206         else if (ev == OBD_NOTIFY_DISCON) {
 207                 /* For disconnect event, flush fld cache for failout MDS case. */
 208                 fld_client_flush(&lmv->lmv_fld);
 209         }
 210 #endif
 211         /* Pass the notification up the chain. */
 212         if (obd->obd_observer)
 213                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 214
 215         RETURN(rc);
 216 }
 217
 218 /* this is fake connect function. Its purpose is to initialize lmv and say
 219  * caller that everything is okay. Real connection will be performed later. */
 220 static int lmv_connect(const struct lu_env *env,
 221                        struct lustre_handle *conn, struct obd_device *obd,
 222                        struct obd_uuid *cluuid, struct obd_connect_data *data)
 223 {
 224 #ifdef __KERNEL__
 225         struct proc_dir_entry *lmv_proc_dir;
 226 #endif
 227         struct lmv_obd *lmv = &obd->u.lmv;
 228         struct obd_export *exp;
 229         int rc = 0;
 230         ENTRY;
 231
 232         rc = class_connect(conn, obd, cluuid);
 233         if (rc) {
 234                 CERROR("class_connection() returned %d\n", rc);
 235                 RETURN(rc);
 236         }
 237
 238         exp = class_conn2export(conn);
 239
 240         /* we don't want to actually do the underlying connections more than
 241          * once, so keep track. */
 242         lmv->refcount++;
 243         if (lmv->refcount > 1) {
 244                 class_export_put(exp);
 245                 RETURN(0);
 246         }
 247
 248         lmv->exp = exp;
 249         lmv->connected = 0;
 250         lmv->cluuid = *cluuid;
 251
 252         if (data)
 253                 lmv->conn_data = *data;
 254
 255 #ifdef __KERNEL__
 256         lmv_proc_dir = lprocfs_register("target_obds", obd->obd_proc_entry,
 257                                         NULL, NULL);
 258         if (IS_ERR(lmv_proc_dir)) {
 259                 CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 260                        obd->obd_type->typ_name, obd->obd_name);
 261                 lmv_proc_dir = NULL;
 262         }
 263 #endif
 264
 265         /* all real clients should perform actual connection right away, because
 266          * it is possible, that LMV will not have opportunity to connect targets
 267          * and MDC stuff will be called directly, for instance while reading
 268          * ../mdc/../kbytesfree procfs file, etc. */
 269         if (data->ocd_connect_flags & OBD_CONNECT_REAL)
 270                 rc = lmv_check_connect(obd);
 271
 272 #ifdef __KERNEL__
 273         if (rc) {
 274                 if (lmv_proc_dir)
 275                         lprocfs_remove(&lmv_proc_dir);
 276         }
 277 #endif
 278
 279         RETURN(rc);
 280 }
 281
 282 static void lmv_set_timeouts(struct obd_device *obd)
 283 {
 284         struct lmv_tgt_desc *tgts;
 285         struct lmv_obd *lmv;
 286         int i;
 287
 288         lmv = &obd->u.lmv;
 289         if (lmv->server_timeout == 0)
 290                 return;
 291
 292         if (lmv->connected == 0)
 293                 return;
 294
 295         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 296                 if (tgts->ltd_exp == NULL)
 297                         continue;
 298
 299                 obd_set_info_async(tgts->ltd_exp, strlen("inter_mds"),
 300                                    "inter_mds", 0, NULL, NULL);
 301         }
 302 }
 303
 304 static int lmv_init_ea_size(struct obd_export *exp, int easize,
 305                             int def_easize, int cookiesize)
 306 {
 307         struct obd_device *obd = exp->exp_obd;
 308         struct lmv_obd *lmv = &obd->u.lmv;
 309         int i, rc = 0, change = 0;
 310         ENTRY;
 311
 312         if (lmv->max_easize < easize) {
 313                 lmv->max_easize = easize;
 314                 change = 1;
 315         }
 316         if (lmv->max_def_easize < def_easize) {
 317                 lmv->max_def_easize = def_easize;
 318                 change = 1;
 319         }
 320         if (lmv->max_cookiesize < cookiesize) {
 321                 lmv->max_cookiesize = cookiesize;
 322                 change = 1;
 323         }
 324         if (change == 0)
 325                 RETURN(0);
 326
 327         if (lmv->connected == 0)
 328                 RETURN(0);
 329
 330         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 331                 if (lmv->tgts[i].ltd_exp == NULL) {
 332                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 333                         continue;
 334                 }
 335
 336                 rc = md_init_ea_size(lmv->tgts[i].ltd_exp, easize, def_easize,
 337                                      cookiesize);
 338                 if (rc) {
 339                         CERROR("obd_init_ea_size() failed on MDT target %d, "
 340                                "error %d.\n", i, rc);
 341                         break;
 342                 }
 343         }
 344         RETURN(rc);
 345 }
 346
 347 #define MAX_STRING_SIZE 128
 348
 349 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 350 {
 351         struct lmv_obd *lmv = &obd->u.lmv;
 352         struct obd_uuid *cluuid = &lmv->cluuid;
 353         struct obd_connect_data *mdc_data = NULL;
 354         struct obd_uuid lmv_mdc_uuid = { "LMV_MDC_UUID" };
 355         struct lustre_handle conn = {0, };
 356         struct obd_device *mdc_obd;
 357         struct obd_export *mdc_exp;
 358         struct lu_fld_target target;
 359         int rc;
 360 #ifdef __KERNEL__
 361         struct proc_dir_entry *lmv_proc_dir;
 362 #endif
 363         ENTRY;
 364
 365         /* for MDS: don't connect to yourself */
 366         if (obd_uuid_equals(&tgt->ltd_uuid, cluuid)) {
 367                 CDEBUG(D_CONFIG, "don't connect back to %s\n", cluuid->uuid);
 368                 /* XXX - the old code didn't increment active tgt count.
 369                  *       should we ? */
 370                 RETURN(0);
 371         }
 372
 373         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 374                                         &obd->obd_uuid);
 375         if (!mdc_obd) {
 376                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 377                 RETURN(-EINVAL);
 378         }
 379
 380         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 381                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 382                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 383                 cluuid->uuid);
 384
 385         if (!mdc_obd->obd_set_up) {
 386                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 387                 RETURN(-EINVAL);
 388         }
 389
 390         rc = obd_connect(NULL, &conn, mdc_obd, &lmv_mdc_uuid,
 391                          &lmv->conn_data);
 392         if (rc) {
 393                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 394                 RETURN(rc);
 395         }
 396
 397         mdc_exp = class_conn2export(&conn);
 398
 399         /* Init fid sequence client for this mdc. */
 400         rc = obd_fid_init(mdc_exp);
 401         if (rc)
 402                 RETURN(rc);
 403
 404         /* Add new FLD target. */
 405         target.ft_srv = NULL;
 406         target.ft_exp = mdc_exp;
 407         target.ft_idx = tgt->ltd_idx;
 408
 409         fld_client_add_target(&lmv->lmv_fld, &target);
 410
 411         mdc_data = &class_exp2cliimp(mdc_exp)->imp_connect_data;
 412
 413         rc = obd_register_observer(mdc_obd, obd);
 414         if (rc) {
 415                 obd_disconnect(mdc_exp);
 416                 CERROR("target %s register_observer error %d\n",
 417                        tgt->ltd_uuid.uuid, rc);
 418                 RETURN(rc);
 419         }
 420
 421         if (obd->obd_observer) {
 422                 /* tell the mds_lmv about the new target */
 423                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 424                                 OBD_NOTIFY_ACTIVE, (void *)(tgt - lmv->tgts));
 425                 if (rc) {
 426                         obd_disconnect(mdc_exp);
 427                         RETURN(rc);
 428                 }
 429         }
 430
 431         tgt->ltd_active = 1;
 432         tgt->ltd_exp = mdc_exp;
 433         lmv->desc.ld_active_tgt_count++;
 434
 435         /* copy connect data, it may be used later */
 436         lmv->datas[tgt->ltd_idx] = *mdc_data;
 437
 438         md_init_ea_size(tgt->ltd_exp, lmv->max_easize,
 439                         lmv->max_def_easize, lmv->max_cookiesize);
 440
 441         CDEBUG(D_CONFIG, "connected to %s(%s) successfully (%d)\n",
 442                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 443                 atomic_read(&obd->obd_refcount));
 444
 445 #ifdef __KERNEL__
 446         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 447         if (lmv_proc_dir) {
 448                 struct proc_dir_entry *mdc_symlink;
 449                 char name[MAX_STRING_SIZE + 1];
 450
 451                 LASSERT(mdc_obd->obd_type != NULL);
 452                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 453                 name[MAX_STRING_SIZE] = '\0';
 454                 snprintf(name, MAX_STRING_SIZE, "../../../%s/%s",
 455                          mdc_obd->obd_type->typ_name,
 456                          mdc_obd->obd_name);
 457                 mdc_symlink = proc_symlink(mdc_obd->obd_name,
 458                                            lmv_proc_dir, name);
 459                 if (mdc_symlink == NULL) {
 460                         CERROR("could not register LMV target "
 461                                "/proc/fs/lustre/%s/%s/target_obds/%s.",
 462                                obd->obd_type->typ_name, obd->obd_name,
 463                                mdc_obd->obd_name);
 464                         lprocfs_remove(&lmv_proc_dir);
 465                         lmv_proc_dir = NULL;
 466                 }
 467         }
 468 #endif
 469         RETURN(0);
 470 }
 471
 472 int lmv_add_target(struct obd_device *obd, struct obd_uuid *tgt_uuid)
 473 {
 474         struct lmv_obd *lmv = &obd->u.lmv;
 475         struct lmv_tgt_desc *tgt;
 476         int rc = 0;
 477         ENTRY;
 478
 479         CDEBUG(D_CONFIG, "tgt_uuid: %s.\n", tgt_uuid->uuid);
 480
 481         lmv_init_lock(lmv);
 482
 483         if (lmv->desc.ld_active_tgt_count >= LMV_MAX_TGT_COUNT) {
 484                 lmv_init_unlock(lmv);
 485                 CERROR("can't add %s, LMV module compiled for %d MDCs. "
 486                        "That many MDCs already configured.\n",
 487                        tgt_uuid->uuid, LMV_MAX_TGT_COUNT);
 488                 RETURN(-EINVAL);
 489         }
 490         if (lmv->desc.ld_tgt_count == 0) {
 491                 struct obd_device *mdc_obd;
 492
 493                 mdc_obd = class_find_client_obd(tgt_uuid, LUSTRE_MDC_NAME,
 494                                                 &obd->obd_uuid);
 495                 if (!mdc_obd) {
 496                         lmv_init_unlock(lmv);
 497                         CERROR("Target %s not attached\n", tgt_uuid->uuid);
 498                         RETURN(-EINVAL);
 499                 }
 500
 501                 rc = obd_llog_init(obd, NULL, mdc_obd, 0, NULL, tgt_uuid);
 502                 if (rc) {
 503                         lmv_init_unlock(lmv);
 504                         CERROR("lmv failed to setup llogging subsystems\n");
 505                 }
 506         }
 507         spin_lock(&lmv->lmv_lock);
 508         tgt = lmv->tgts + lmv->desc.ld_tgt_count++;
 509         tgt->ltd_uuid = *tgt_uuid;
 510         spin_unlock(&lmv->lmv_lock);
 511
 512         if (lmv->connected) {
 513                 rc = lmv_connect_mdc(obd, tgt);
 514                 if (rc) {
 515                         spin_lock(&lmv->lmv_lock);
 516                         lmv->desc.ld_tgt_count--;
 517                         memset(tgt, 0, sizeof(*tgt));
 518                         spin_unlock(&lmv->lmv_lock);
 519                 } else {
 520                         int easize = sizeof(struct lmv_stripe_md) +
 521                                      lmv->desc.ld_tgt_count *
 522                                      sizeof(struct lu_fid);
 523                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0);
 524                 }
 525         }
 526
 527         lmv_init_unlock(lmv);
 528         RETURN(rc);
 529 }
 530
 531 /* performs a check if passed obd is connected. If no - connect it. */
 532 int lmv_check_connect(struct obd_device *obd)
 533 {
 534         struct lmv_obd *lmv = &obd->u.lmv;
 535         struct lmv_tgt_desc *tgt;
 536         int i, rc, easize;
 537         ENTRY;
 538
 539         if (lmv->connected)
 540                 RETURN(0);
 541
 542         lmv_init_lock(lmv);
 543         if (lmv->connected) {
 544                 lmv_init_unlock(lmv);
 545                 RETURN(0);
 546         }
 547
 548         if (lmv->desc.ld_tgt_count == 0) {
 549                 CERROR("%s: no targets configured.\n", obd->obd_name);
 550                 RETURN(-EINVAL);
 551         }
 552
 553         CDEBUG(D_CONFIG, "time to connect %s to %s\n",
 554                lmv->cluuid.uuid, obd->obd_name);
 555
 556         LASSERT(lmv->tgts != NULL);
 557
 558         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 559                 rc = lmv_connect_mdc(obd, tgt);
 560                 if (rc)
 561                         GOTO(out_disc, rc);
 562         }
 563
 564         lmv_set_timeouts(obd);
 565         class_export_put(lmv->exp);
 566         lmv->connected = 1;
 567         easize = lmv_get_easize(lmv);
 568         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0);
 569         lmv_init_unlock(lmv);
 570         RETURN(0);
 571
 572  out_disc:
 573         while (i-- > 0) {
 574                 int rc2;
 575                 --tgt;
 576                 tgt->ltd_active = 0;
 577                 if (tgt->ltd_exp) {
 578                         --lmv->desc.ld_active_tgt_count;
 579                         rc2 = obd_disconnect(tgt->ltd_exp);
 580                         if (rc2) {
 581                                 CERROR("error: LMV target %s disconnect on "
 582                                        "MDC idx %d: error %d\n",
 583                                        tgt->ltd_uuid.uuid, i, rc2);
 584                         }
 585                 }
 586         }
 587         class_disconnect(lmv->exp);
 588         lmv_init_unlock(lmv);
 589         RETURN(rc);
 590 }
 591
 592 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 593 {
 594 #ifdef __KERNEL__
 595         struct proc_dir_entry *lmv_proc_dir;
 596 #endif
 597         struct lmv_obd *lmv = &obd->u.lmv;
 598         struct obd_device *mdc_obd;
 599         int rc;
 600         ENTRY;
 601
 602         LASSERT(tgt != NULL);
 603         LASSERT(obd != NULL);
 604
 605         mdc_obd = class_exp2obd(tgt->ltd_exp);
 606
 607         if (mdc_obd)
 608                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 609
 610 #ifdef __KERNEL__
 611         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 612         if (lmv_proc_dir) {
 613                 struct proc_dir_entry *mdc_symlink;
 614
 615                 mdc_symlink = lprocfs_srch(lmv_proc_dir, mdc_obd->obd_name);
 616                 if (mdc_symlink) {
 617                         lprocfs_remove(&mdc_symlink);
 618                 } else {
 619                         CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing\n",
 620                                obd->obd_type->typ_name, obd->obd_name,
 621                                mdc_obd->obd_name);
 622                 }
 623         }
 624 #endif
 625         rc = obd_fid_fini(tgt->ltd_exp);
 626         if (rc)
 627                 CERROR("Can't finanize fids factory\n");
 628
 629         CDEBUG(D_OTHER, "Disconnected from %s(%s) successfully\n",
 630                tgt->ltd_exp->exp_obd->obd_name,
 631                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 632
 633         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 634         rc = obd_disconnect(tgt->ltd_exp);
 635         if (rc) {
 636                 if (tgt->ltd_active) {
 637                         CERROR("Target %s disconnect error %d\n",
 638                                tgt->ltd_uuid.uuid, rc);
 639                 }
 640         }
 641
 642         lmv_activate_target(lmv, tgt, 0);
 643         tgt->ltd_exp = NULL;
 644         RETURN(0);
 645 }
 646
 647 static int lmv_disconnect(struct obd_export *exp)
 648 {
 649         struct obd_device *obd = class_exp2obd(exp);
 650 #ifdef __KERNEL__
 651         struct proc_dir_entry *lmv_proc_dir;
 652 #endif
 653         struct lmv_obd *lmv = &obd->u.lmv;
 654         int rc, i;
 655         ENTRY;
 656
 657         if (!lmv->tgts)
 658                 goto out_local;
 659
 660         /* Only disconnect the underlying layers on the final disconnect. */
 661         lmv->refcount--;
 662         if (lmv->refcount != 0)
 663                 goto out_local;
 664
 665         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 666                 if (lmv->tgts[i].ltd_exp == NULL)
 667                         continue;
 668                 lmv_disconnect_mdc(obd, &lmv->tgts[i]);
 669         }
 670
 671 #ifdef __KERNEL__
 672         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 673         if (lmv_proc_dir) {
 674                 lprocfs_remove(&lmv_proc_dir);
 675         } else {
 676                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 677                        obd->obd_type->typ_name, obd->obd_name);
 678         }
 679 #endif
 680
 681 out_local:
 682         /*
 683          * This is the case when no real connection is established by
 684          * lmv_check_connect().
 685          */
 686         if (!lmv->connected)
 687                 class_export_put(exp);
 688         rc = class_disconnect(exp);
 689         if (lmv->refcount == 0)
 690                 lmv->connected = 0;
 691         RETURN(rc);
 692 }
 693
 694 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 695                          int len, void *karg, void *uarg)
 696 {
 697         struct obd_device *obddev = class_exp2obd(exp);
 698         struct lmv_obd *lmv = &obddev->u.lmv;
 699         int i, rc = 0, set = 0;
 700         ENTRY;
 701
 702         if (lmv->desc.ld_tgt_count == 0)
 703                 RETURN(-ENOTTY);
 704
 705         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 706                 int err;
 707
 708                 if (lmv->tgts[i].ltd_exp == NULL)
 709                         continue;
 710
 711                 err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp, len, karg, uarg);
 712                 if (err) {
 713                         if (lmv->tgts[i].ltd_active) {
 714                                 CERROR("error: iocontrol MDC %s on MDT"
 715                                        "idx %d: err = %d\n",
 716                                        lmv->tgts[i].ltd_uuid.uuid, i, err);
 717                                 if (!rc)
 718                                         rc = err;
 719                         }
 720                 } else
 721                         set = 1;
 722         }
 723         if (!set && !rc)
 724                 rc = -EIO;
 725
 726         RETURN(rc);
 727 }
 728
 729 enum MDS_POLICY {
 730      CHAR_TYPE,
 731      NID_TYPE
 732 };
 733
 734 static int lmv_all_chars_policy(int count, const char *name,
 735                                 int len)
 736 {
 737         unsigned int c = 0;
 738
 739         while (len > 0)
 740                 c += name[--len];
 741         c = c % count;
 742         return c;
 743 }
 744
 745 static int lmv_nid_policy(struct lmv_obd *lmv)
 746 {
 747         struct obd_import *imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
 748         __u32 id;
 749         /*
 750          * XXX Hack: to get nid we assume that underlying obd device is mdc.
 751          */
 752         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
 753         return id % lmv->desc.ld_tgt_count;
 754 }
 755
 756 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
 757                           int type)
 758 {
 759         switch (type) {
 760         case CHAR_TYPE:
 761                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
 762                                             op_data->op_name,
 763                                             op_data->op_namelen);
 764         case NID_TYPE:
 765                 return lmv_nid_policy(lmv);
 766
 767         default:
 768                 break;
 769         }
 770
 771         CERROR("unsupport type %d \n", type);
 772         return -EINVAL;
 773 }
 774
 775 /* This is _inode_ placement policy function (not name). */
 776 static int lmv_placement_policy(struct obd_device *obd,
 777                                 struct md_op_data *op_data,
 778                                 mdsno_t *mds)
 779 {
 780         struct lmv_obd *lmv = &obd->u.lmv;
 781         struct lmv_obj *obj;
 782         int rc;
 783         ENTRY;
 784
 785         LASSERT(mds != NULL);
 786
 787         /*
 788          * Allocate new fid on target according to operation type and parent
 789          * home mds.
 790          */
 791         obj = lmv_obj_grab(obd, &op_data->op_fid1);
 792         if (obj != NULL || op_data->op_name == NULL ||
 793             op_data->op_opc != LUSTRE_OPC_MKDIR) {
 794                 /*
 795                  * Allocate fid for non-dir or for null name or for case parent
 796                  * dir is split.
 797                  */
 798                 if (obj) {
 799                         lmv_obj_put(obj);
 800
 801                         /*
 802                          * If we have this flag turned on, and we see that
 803                          * parent dir is split, this means, that caller did not
 804                          * notice split yet. This is race and we would like to
 805                          * let caller know that.
 806                          */
 807                         if (op_data->op_bias & MDS_CHECK_SPLIT)
 808                                 RETURN(-ERESTART);
 809                 }
 810
 811                 /*
 812                  * Allocate new fid on same mds where parent fid is located and
 813                  * where operation will be sent. In case of split dir, ->op_fid1
 814                  * and ->op_mds here will contain fid and mds of slave directory
 815                  * object (assigned by caller).
 816                  */
 817                 *mds = op_data->op_mds;
 818                 rc = 0;
 819
 820 #if 0
 821                 /* XXX: This should be removed later wehn we sure it is not
 822                  * needed. */
 823                 rc = lmv_fld_lookup(lmv, &op_data->op_fid1, mds);
 824                 if (rc)
 825                         GOTO(out, rc);
 826 #endif
 827         } else {
 828                 /*
 829                  * Parent directory is not split and we want to create a
 830                  * directory in it. Let's calculate where to place it according
 831                  * to name.
 832                  */
 833                 *mds = lmv_choose_mds(lmv, op_data, NID_TYPE);
 834                 rc = 0;
 835         }
 836         EXIT;
 837 #if 0
 838 out:
 839 #endif
 840         if (rc) {
 841                 CERROR("Can't choose MDS, err = %d\n", rc);
 842         } else {
 843                 LASSERT(*mds < lmv->desc.ld_tgt_count);
 844         }
 845
 846         return rc;
 847 }
 848
 849 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid,
 850                     mdsno_t mds)
 851 {
 852         struct lmv_tgt_desc *tgt = &lmv->tgts[mds];
 853         int rc;
 854         ENTRY;
 855
 856         /* New seq alloc and FLD setup should be atomic. */
 857         down(&tgt->ltd_fid_sem);
 858
 859         /* Asking underlaying tgt layer to allocate new fid. */
 860         rc = obd_fid_alloc(tgt->ltd_exp, fid, NULL);
 861         if (rc > 0) {
 862                 LASSERT(fid_is_sane(fid));
 863
 864                 /* Client switches to new sequence, setup FLD. */
 865                 rc = fld_client_create(&lmv->lmv_fld, fid_seq(fid),
 866                                        mds, NULL);
 867                 if (rc) {
 868                         CERROR("Can't create fld entry, rc %d\n", rc);
 869                         /* Delete just allocated fid sequence */
 870                         obd_fid_delete(tgt->ltd_exp, NULL);
 871                 }
 872         }
 873         up(&tgt->ltd_fid_sem);
 874         RETURN(rc);
 875 }
 876
 877 int lmv_fid_alloc(struct obd_export *exp, struct lu_fid *fid,
 878                   struct md_op_data *op_data)
 879 {
 880         struct obd_device *obd = class_exp2obd(exp);
 881         struct lmv_obd *lmv = &obd->u.lmv;
 882         mdsno_t mds;
 883         int rc;
 884         ENTRY;
 885
 886         LASSERT(op_data != NULL);
 887         LASSERT(fid != NULL);
 888
 889         rc = lmv_placement_policy(obd, op_data, &mds);
 890         if (rc) {
 891                 CERROR("Can't get target for allocating fid, "
 892                        "rc %d\n", rc);
 893                 RETURN(rc);
 894         }
 895
 896         rc = __lmv_fid_alloc(lmv, fid, mds);
 897         if (rc) {
 898                 CERROR("Can't alloc new fid, rc %d\n", rc);
 899                 RETURN(rc);
 900         }
 901
 902         RETURN(rc);
 903 }
 904
 905 static int lmv_fid_delete(struct obd_export *exp, const struct lu_fid *fid)
 906 {
 907         ENTRY;
 908
 909         LASSERT(exp && fid);
 910         if (lmv_obj_delete(exp, fid)) {
 911                 CDEBUG(D_OTHER, "lmv object "DFID" is destroyed.\n",
 912                        PFID(fid));
 913         }
 914         RETURN(0);
 915 }
 916
 917 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 918 {
 919         struct lmv_obd *lmv = &obd->u.lmv;
 920         struct lprocfs_static_vars lvars;
 921         struct lmv_desc *desc;
 922         int rc, i = 0;
 923         ENTRY;
 924
 925         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 926                 CERROR("LMV setup requires a descriptor\n");
 927                 RETURN(-EINVAL);
 928         }
 929
 930         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
 931         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 932                 CERROR("descriptor size wrong: %d > %d\n",
 933                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 934                 RETURN(-EINVAL);
 935         }
 936
 937         lmv->tgts_size = LMV_MAX_TGT_COUNT * sizeof(struct lmv_tgt_desc);
 938
 939         OBD_ALLOC(lmv->tgts, lmv->tgts_size);
 940         if (lmv->tgts == NULL)
 941                 RETURN(-ENOMEM);
 942
 943         for (i = 0; i < LMV_MAX_TGT_COUNT; i++) {
 944                 sema_init(&lmv->tgts[i].ltd_fid_sem, 1);
 945                 lmv->tgts[i].ltd_idx = i;
 946         }
 947
 948         lmv->datas_size = LMV_MAX_TGT_COUNT * sizeof(struct obd_connect_data);
 949
 950         OBD_ALLOC(lmv->datas, lmv->datas_size);
 951         if (lmv->datas == NULL)
 952                 GOTO(out_free_tgts, rc = -ENOMEM);
 953
 954         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
 955         lmv->desc.ld_tgt_count = 0;
 956         lmv->desc.ld_active_tgt_count = 0;
 957         lmv->max_cookiesize = 0;
 958         lmv->max_def_easize = 0;
 959         lmv->max_easize = 0;
 960
 961         spin_lock_init(&lmv->lmv_lock);
 962         sema_init(&lmv->init_sem, 1);
 963
 964         rc = lmv_obj_setup(obd);
 965         if (rc) {
 966                 CERROR("Can't setup LMV object manager, "
 967                        "error %d.\n", rc);
 968                 GOTO(out_free_datas, rc);
 969         }
 970
 971         lprocfs_init_vars(lmv, &lvars);
 972         lprocfs_obd_setup(obd, lvars.obd_vars);
 973 #ifdef LPROCFS
 974         {
 975                 struct proc_dir_entry *entry;
 976
 977                 entry = create_proc_entry("target_obd_status", 0444,
 978                                           obd->obd_proc_entry);
 979                 if (entry != NULL) {
 980                         entry->proc_fops = &lmv_proc_target_fops;
 981                         entry->data = obd;
 982                 }
 983        }
 984 #endif
 985         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
 986                              LUSTRE_CLI_FLD_HASH_DHT);
 987         if (rc) {
 988                 CERROR("can't init FLD, err %d\n",
 989                        rc);
 990                 GOTO(out_free_datas, rc);
 991         }
 992
 993         RETURN(0);
 994
 995 out_free_datas:
 996         OBD_FREE(lmv->datas, lmv->datas_size);
 997         lmv->datas = NULL;
 998 out_free_tgts:
 999         OBD_FREE(lmv->tgts, lmv->tgts_size);
1000         lmv->tgts = NULL;
1001         return rc;
1002 }
1003
1004 static int lmv_cleanup(struct obd_device *obd)
1005 {
1006         struct lmv_obd *lmv = &obd->u.lmv;
1007         ENTRY;
1008
1009         fld_client_fini(&lmv->lmv_fld);
1010         lprocfs_obd_cleanup(obd);
1011         lmv_obj_cleanup(obd);
1012         OBD_FREE(lmv->datas, lmv->datas_size);
1013         OBD_FREE(lmv->tgts, lmv->tgts_size);
1014
1015         RETURN(0);
1016 }
1017
1018 static int lmv_process_config(struct obd_device *obd, obd_count len, void *buf)
1019 {
1020         struct lustre_cfg *lcfg = buf;
1021         struct obd_uuid tgt_uuid;
1022         int rc;
1023         ENTRY;
1024
1025         switch(lcfg->lcfg_command) {
1026         case LCFG_ADD_MDC:
1027                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(tgt_uuid.uuid))
1028                         GOTO(out, rc = -EINVAL);
1029
1030                 obd_str2uuid(&tgt_uuid, lustre_cfg_string(lcfg, 1));
1031                 rc = lmv_add_target(obd, &tgt_uuid);
1032                 GOTO(out, rc);
1033         default: {
1034                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1035                 GOTO(out, rc = -EINVAL);
1036         }
1037         }
1038 out:
1039         RETURN(rc);
1040 }
1041
1042 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1043                       __u64 max_age)
1044 {
1045         struct lmv_obd *lmv = &obd->u.lmv;
1046         struct obd_statfs *temp;
1047         int rc = 0, i;
1048         ENTRY;
1049
1050         rc = lmv_check_connect(obd);
1051         if (rc)
1052                 RETURN(rc);
1053
1054         OBD_ALLOC(temp, sizeof(*temp));
1055         if (temp == NULL)
1056                 RETURN(-ENOMEM);
1057
1058         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1059                 if (lmv->tgts[i].ltd_exp == NULL)
1060                         continue;
1061
1062                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, temp, max_age);
1063                 if (rc) {
1064                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1065                                lmv->tgts[i].ltd_exp->exp_obd->obd_name,
1066                                rc);
1067                         GOTO(out_free_temp, rc);
1068                 }
1069                 if (i == 0) {
1070                         *osfs = *temp;
1071                 } else {
1072                         osfs->os_bavail += temp->os_bavail;
1073                         osfs->os_blocks += temp->os_blocks;
1074                         osfs->os_ffree += temp->os_ffree;
1075                         osfs->os_files += temp->os_files;
1076                 }
1077         }
1078
1079         EXIT;
1080 out_free_temp:
1081         OBD_FREE(temp, sizeof(*temp));
1082         return rc;
1083 }
1084
1085 static int lmv_getstatus(struct obd_export *exp,
1086                          struct lu_fid *fid,
1087                          struct obd_capa **pc)
1088 {
1089         struct obd_device *obd = exp->exp_obd;
1090         struct lmv_obd *lmv = &obd->u.lmv;
1091         int rc;
1092         ENTRY;
1093
1094         rc = lmv_check_connect(obd);
1095         if (rc)
1096                 RETURN(rc);
1097
1098         rc = md_getstatus(lmv->tgts[0].ltd_exp, fid, pc);
1099
1100         RETURN(rc);
1101 }
1102
1103 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1104                         struct obd_capa *oc, obd_valid valid, const char *name,
1105                         const char *input, int input_size, int output_size,
1106                         int flags, struct ptlrpc_request **request)
1107 {
1108         struct obd_device *obd = exp->exp_obd;
1109         struct lmv_obd *lmv = &obd->u.lmv;
1110         struct obd_export *tgt_exp;
1111         int rc;
1112         ENTRY;
1113
1114         rc = lmv_check_connect(obd);
1115         if (rc)
1116                 RETURN(rc);
1117
1118         tgt_exp = lmv_find_export(lmv, fid);
1119         if (IS_ERR(tgt_exp))
1120                 RETURN(PTR_ERR(tgt_exp));
1121
1122         rc = md_getxattr(tgt_exp, fid, oc, valid, name, input, input_size,
1123                          output_size, flags, request);
1124
1125         RETURN(rc);
1126 }
1127
1128 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1129                         struct obd_capa *oc, obd_valid valid, const char *name,
1130                         const char *input, int input_size, int output_size,
1131                         int flags, struct ptlrpc_request **request)
1132 {
1133         struct obd_device *obd = exp->exp_obd;
1134         struct lmv_obd *lmv = &obd->u.lmv;
1135         struct obd_export *tgt_exp;
1136         int rc;
1137         ENTRY;
1138
1139         rc = lmv_check_connect(obd);
1140         if (rc)
1141                 RETURN(rc);
1142
1143         tgt_exp = lmv_find_export(lmv, fid);
1144         if (IS_ERR(tgt_exp))
1145                 RETURN(PTR_ERR(tgt_exp));
1146
1147         rc = md_setxattr(tgt_exp, fid, oc, valid, name,
1148                          input, input_size, output_size, flags, request);
1149
1150         RETURN(rc);
1151 }
1152
1153 static int lmv_getattr(struct obd_export *exp, const struct lu_fid *fid,
1154                        struct obd_capa *oc, obd_valid valid, int ea_size,
1155                        struct ptlrpc_request **request)
1156 {
1157         struct obd_device *obd = exp->exp_obd;
1158         struct lmv_obd *lmv = &obd->u.lmv;
1159         struct obd_export *tgt_exp;
1160         struct lmv_obj *obj;
1161         int rc, i;
1162         ENTRY;
1163
1164         rc = lmv_check_connect(obd);
1165         if (rc)
1166                 RETURN(rc);
1167
1168         tgt_exp = lmv_find_export(lmv, fid);
1169         if (IS_ERR(tgt_exp))
1170                 RETURN(PTR_ERR(tgt_exp));
1171
1172         rc = md_getattr(tgt_exp, fid, oc, valid, ea_size, request);
1173         if (rc)
1174                 RETURN(rc);
1175
1176         obj = lmv_obj_grab(obd, fid);
1177
1178         CDEBUG(D_OTHER, "GETATTR for "DFID" %s\n", PFID(fid),
1179                obj ? "(split)" : "");
1180
1181         /*
1182          * If object is split, then we loop over all the slaves and gather size
1183          * attribute. In ideal world we would have to gather also mds field from
1184          * all slaves, as object is spread over the cluster and this is
1185          * definitely interesting information and it is not good to loss it,
1186          * but...
1187          */
1188         if (obj) {
1189                 struct mdt_body *body;
1190
1191                 if (*request == NULL) {
1192                         lmv_obj_put(obj);
1193                         RETURN(rc);
1194                 }
1195
1196                 body = lustre_msg_buf((*request)->rq_repmsg, REPLY_REC_OFF,
1197                                       sizeof(*body));
1198                 LASSERT(body != NULL);
1199                 LASSERT(lustre_rep_swabbed(*request, REPLY_REC_OFF));
1200
1201                 lmv_obj_lock(obj);
1202
1203                 for (i = 0; i < obj->lo_objcount; i++) {
1204                         if (lmv->tgts[i].ltd_exp == NULL) {
1205                                 CWARN("%s: NULL export for %d\n",
1206                                       obd->obd_name, i);
1207                                 continue;
1208                         }
1209
1210                         /* skip master obj. */
1211                         if (lu_fid_eq(&obj->lo_fid, &obj->lo_inodes[i].li_fid))
1212                                 continue;
1213
1214                         lmv_update_body(body, &obj->lo_inodes[i]);
1215                 }
1216
1217                 lmv_obj_unlock(obj);
1218                 lmv_obj_put(obj);
1219         }
1220
1221         RETURN(rc);
1222 }
1223
1224 static int lmv_change_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1225                              ldlm_iterator_t it, void *data)
1226 {
1227         struct obd_device *obd = exp->exp_obd;
1228         struct lmv_obd *lmv = &obd->u.lmv;
1229         int i, rc;
1230         ENTRY;
1231
1232         rc = lmv_check_connect(obd);
1233         if (rc)
1234                 RETURN(rc);
1235
1236         CDEBUG(D_OTHER, "CBDATA for "DFID"\n", PFID(fid));
1237
1238         /*
1239          * With CMD every object can have two locks in different namespaces:
1240          * lookup lock in space of mds storing direntry and update/open lock in
1241          * space of mds storing inode.
1242          */
1243         for (i = 0; i < lmv->desc.ld_tgt_count; i++)
1244                 md_change_cbdata(lmv->tgts[i].ltd_exp, fid, it, data);
1245
1246         RETURN(0);
1247 }
1248
1249 static int lmv_close(struct obd_export *exp,
1250                      struct md_op_data *op_data,
1251                      struct md_open_data *mod,
1252                      struct ptlrpc_request **request)
1253 {
1254         struct obd_device *obd = exp->exp_obd;
1255         struct lmv_obd *lmv = &obd->u.lmv;
1256         struct obd_export *tgt_exp;
1257         int rc;
1258         ENTRY;
1259
1260         rc = lmv_check_connect(obd);
1261         if (rc)
1262                 RETURN(rc);
1263
1264         tgt_exp = lmv_find_export(lmv, &op_data->op_fid1);
1265         if (IS_ERR(tgt_exp))
1266                 RETURN(PTR_ERR(tgt_exp));
1267
1268         CDEBUG(D_OTHER, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1269         rc = md_close(tgt_exp, op_data, mod, request);
1270         RETURN(rc);
1271 }
1272
1273 /*
1274  * Called in the case MDS returns -ERESTART on create on open, what means that
1275  * directory is split and its LMV presentation object has to be updated.
1276  */
1277 int lmv_handle_split(struct obd_export *exp, const struct lu_fid *fid)
1278 {
1279         struct obd_device *obd = exp->exp_obd;
1280         struct lmv_obd *lmv = &obd->u.lmv;
1281         struct ptlrpc_request *req = NULL;
1282         struct obd_export *tgt_exp;
1283         struct lmv_obj *obj;
1284         struct lustre_md md;
1285         int mealen, rc;
1286         __u64 valid;
1287         ENTRY;
1288
1289         md.mea = NULL;
1290         mealen = lmv_get_easize(lmv);
1291
1292         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA | OBD_MD_MEA;
1293
1294         tgt_exp = lmv_find_export(lmv, fid);
1295         if (IS_ERR(tgt_exp))
1296                 RETURN(PTR_ERR(tgt_exp));
1297
1298         /* time to update mea of parent fid */
1299         rc = md_getattr(tgt_exp, fid, NULL, valid, mealen, &req);
1300         if (rc) {
1301                 CERROR("md_getattr() failed, error %d\n", rc);
1302                 GOTO(cleanup, rc);
1303         }
1304
1305         rc = md_get_lustre_md(tgt_exp, req, 1, NULL, exp, &md);
1306         if (rc) {
1307                 CERROR("mdc_get_lustre_md() failed, error %d\n", rc);
1308                 GOTO(cleanup, rc);
1309         }
1310
1311         if (md.mea == NULL)
1312                 GOTO(cleanup, rc = -ENODATA);
1313
1314         obj = lmv_obj_create(exp, fid, md.mea);
1315         if (IS_ERR(obj))
1316                 rc = PTR_ERR(obj);
1317         else
1318                 lmv_obj_put(obj);
1319
1320         obd_free_memmd(exp, (struct lov_stripe_md **)&md.mea);
1321
1322         EXIT;
1323 cleanup:
1324         if (req)
1325                 ptlrpc_req_finished(req);
1326         return rc;
1327 }
1328
1329 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1330                const void *data, int datalen, int mode, __u32 uid,
1331                __u32 gid, __u32 cap_effective,  __u64 rdev,
1332                struct ptlrpc_request **request)
1333 {
1334         struct obd_device *obd = exp->exp_obd;
1335         struct lmv_obd *lmv = &obd->u.lmv;
1336         struct obd_export *tgt_exp;
1337         struct lmv_obj *obj;
1338         int rc, loop = 0;
1339         ENTRY;
1340
1341         rc = lmv_check_connect(obd);
1342         if (rc)
1343                 RETURN(rc);
1344
1345         if (!lmv->desc.ld_active_tgt_count)
1346                 RETURN(-EIO);
1347 repeat:
1348         ++loop;
1349         LASSERT(loop <= 2);
1350         obj = lmv_obj_grab(obd, &op_data->op_fid1);
1351         if (obj) {
1352                 int mea_idx;
1353
1354                 mea_idx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1355                                        op_data->op_name, op_data->op_namelen);
1356                 op_data->op_fid1 = obj->lo_inodes[mea_idx].li_fid;
1357                 op_data->op_bias &= ~MDS_CHECK_SPLIT;
1358                 op_data->op_mds = obj->lo_inodes[mea_idx].li_mds;
1359                 tgt_exp = lmv_get_export(lmv, op_data->op_mds);
1360                 lmv_obj_put(obj);
1361         } else {
1362                 struct lmv_tgt_desc *tgt;
1363
1364                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1365                 op_data->op_bias |= MDS_CHECK_SPLIT;
1366                 op_data->op_mds = tgt->ltd_idx;
1367                 tgt_exp = tgt->ltd_exp;
1368         }
1369
1370         if (IS_ERR(tgt_exp))
1371                 RETURN(PTR_ERR(tgt_exp));
1372
1373         rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
1374         if (rc == -ERESTART)
1375                 goto repeat;
1376         else if (rc)
1377                 RETURN(rc);
1378
1379         CDEBUG(D_OTHER, "CREATE '%*s' on "DFID"\n", op_data->op_namelen,
1380                op_data->op_name, PFID(&op_data->op_fid1));
1381
1382         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1383         rc = md_create(tgt_exp, op_data, data, datalen, mode, uid, gid,
1384                        cap_effective, rdev, request);
1385         if (rc == 0) {
1386                 if (*request == NULL)
1387                         RETURN(rc);
1388                 CDEBUG(D_OTHER, "created - "DFID"\n", PFID(&op_data->op_fid1));
1389         } else if (rc == -ERESTART) {
1390                 LASSERT(*request != NULL);
1391                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1392                           "Got -ERESTART during create!\n");
1393                 ptlrpc_req_finished(*request);
1394                 *request = NULL;
1395
1396                 /*
1397                  * Directory got split. Time to update local object and repeat
1398                  * the request with proper MDS.
1399                  */
1400                 rc = lmv_handle_split(exp, &op_data->op_fid1);
1401                 if (rc == 0) {
1402                         rc = lmv_alloc_slave_fids(obd, &op_data->op_fid1,
1403                                                   op_data, &op_data->op_fid2);
1404                         if (rc)
1405                                 RETURN(rc);
1406                         goto repeat;
1407                 }
1408         }
1409         RETURN(rc);
1410 }
1411
1412 static int lmv_done_writing(struct obd_export *exp,
1413                             struct md_op_data *op_data,
1414                             struct md_open_data *mod)
1415 {
1416         struct obd_device *obd = exp->exp_obd;
1417         struct lmv_obd *lmv = &obd->u.lmv;
1418         struct obd_export *tgt_exp;
1419         int rc;
1420         ENTRY;
1421
1422         rc = lmv_check_connect(obd);
1423         if (rc)
1424                 RETURN(rc);
1425
1426         tgt_exp = lmv_find_export(lmv, &op_data->op_fid1);
1427         if (IS_ERR(tgt_exp))
1428                 RETURN(PTR_ERR(tgt_exp));
1429
1430         rc = md_done_writing(tgt_exp, op_data, mod);
1431         RETURN(rc);
1432 }
1433
1434 static int
1435 lmv_enqueue_slaves(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1436                    struct lookup_intent *it, struct md_op_data *op_data,
1437                    struct lustre_handle *lockh, void *lmm, int lmmsize)
1438 {
1439         struct obd_device *obd = exp->exp_obd;
1440         struct lmv_obd *lmv = &obd->u.lmv;
1441         struct lmv_stripe_md *mea = op_data->op_mea1;
1442         struct md_op_data *op_data2;
1443         struct obd_export *tgt_exp;
1444         int i, rc = 0;
1445         ENTRY;
1446
1447         OBD_ALLOC_PTR(op_data2);
1448         if (op_data2 == NULL)
1449                 RETURN(-ENOMEM);
1450
1451         LASSERT(mea != NULL);
1452         for (i = 0; i < mea->mea_count; i++) {
1453                 memset(op_data2, 0, sizeof(*op_data2));
1454                 op_data2->op_fid1 = mea->mea_ids[i];
1455                 op_data2->op_bias = 0;
1456
1457                 tgt_exp = lmv_find_export(lmv, &op_data2->op_fid1);
1458                 if (IS_ERR(tgt_exp))
1459                         GOTO(cleanup, rc = PTR_ERR(tgt_exp));
1460
1461                 if (tgt_exp == NULL)
1462                         continue;
1463
1464                 rc = md_enqueue(tgt_exp, einfo, it, op_data2,
1465                                 lockh + i, lmm, lmmsize, 0);
1466
1467                 CDEBUG(D_OTHER, "take lock on slave "DFID" -> %d/%d\n",
1468                        PFID(&mea->mea_ids[i]), rc, it->d.lustre.it_status);
1469
1470                 if (rc)
1471                         GOTO(cleanup, rc);
1472
1473                 if (it->d.lustre.it_data) {
1474                         struct ptlrpc_request *req;
1475                         req = (struct ptlrpc_request *)it->d.lustre.it_data;
1476                         ptlrpc_req_finished(req);
1477                 }
1478
1479                 if (it->d.lustre.it_status)
1480                         GOTO(cleanup, rc = it->d.lustre.it_status);
1481         }
1482
1483         EXIT;
1484 cleanup:
1485         OBD_FREE_PTR(op_data2);
1486
1487         if (rc != 0) {
1488                 /* drop all taken locks */
1489                 while (--i >= 0) {
1490                         if (lockh[i].cookie)
1491                                 ldlm_lock_decref(lockh + i, einfo->ei_mode);
1492                         lockh[i].cookie = 0;
1493                 }
1494         }
1495         return rc;
1496 }
1497
1498 static int
1499 lmv_enqueue_remote(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1500                    struct lookup_intent *it, struct md_op_data *op_data,
1501                    struct lustre_handle *lockh, void *lmm, int lmmsize,
1502                    int extra_lock_flags)
1503 {
1504         struct ptlrpc_request *req = it->d.lustre.it_data;
1505         struct obd_device *obd = exp->exp_obd;
1506         struct lmv_obd *lmv = &obd->u.lmv;
1507         struct lustre_handle plock;
1508         struct obd_export *tgt_exp;
1509         struct md_op_data *rdata;
1510         struct lu_fid fid_copy;
1511         struct mdt_body *body;
1512         int rc = 0, pmode;
1513         ENTRY;
1514
1515         body = lustre_msg_buf(req->rq_repmsg,
1516                               DLM_REPLY_REC_OFF, sizeof(*body));
1517         LASSERT(body != NULL);
1518         LASSERT(lustre_rep_swabbed(req, DLM_REPLY_REC_OFF));
1519
1520         if (!(body->valid & OBD_MD_MDS))
1521                 RETURN(0);
1522
1523         CDEBUG(D_OTHER, "ENQUEUE '%s' on "DFID" -> "DFID"\n",
1524                LL_IT2STR(it), PFID(&op_data->op_fid1), PFID(&body->fid1));
1525
1526         /* We got LOOKUP lock, but we really need attrs */
1527         pmode = it->d.lustre.it_lock_mode;
1528         LASSERT(pmode != 0);
1529         memcpy(&plock, lockh, sizeof(plock));
1530         it->d.lustre.it_lock_mode = 0;
1531         it->d.lustre.it_data = NULL;
1532         fid_copy = body->fid1;
1533
1534         it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE;
1535         ptlrpc_req_finished(req);
1536
1537         tgt_exp = lmv_find_export(lmv, &fid_copy);
1538         if (IS_ERR(tgt_exp))
1539                 GOTO(out, rc = PTR_ERR(tgt_exp));
1540
1541         OBD_ALLOC_PTR(rdata);
1542         if (rdata == NULL)
1543                 GOTO(out, rc = -ENOMEM);
1544
1545         rdata->op_fid1 = fid_copy;
1546         rdata->op_bias = MDS_CROSS_REF;
1547
1548         rc = md_enqueue(tgt_exp, einfo, it, rdata, lockh,
1549                         lmm, lmmsize, extra_lock_flags);
1550         OBD_FREE_PTR(rdata);
1551         EXIT;
1552 out:
1553         ldlm_lock_decref(&plock, pmode);
1554         return rc;
1555 }
1556
1557 static int
1558 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1559             struct lookup_intent *it, struct md_op_data *op_data,
1560             struct lustre_handle *lockh, void *lmm, int lmmsize,
1561             int extra_lock_flags)
1562 {
1563         struct obd_device *obd = exp->exp_obd;
1564         struct lmv_obd *lmv = &obd->u.lmv;
1565         struct obd_export *tgt_exp = NULL;
1566         struct lmv_obj *obj;
1567         int rc;
1568         ENTRY;
1569
1570         rc = lmv_check_connect(obd);
1571         if (rc)
1572                 RETURN(rc);
1573
1574         if (op_data->op_mea1 && it->it_op == IT_UNLINK) {
1575                 rc = lmv_enqueue_slaves(exp, einfo, it, op_data,
1576                                         lockh, lmm, lmmsize);
1577                 RETURN(rc);
1578         }
1579
1580         if (op_data->op_namelen) {
1581                 obj = lmv_obj_grab(obd, &op_data->op_fid1);
1582                 if (obj) {
1583                         int mea_idx;
1584
1585                         /* directory is split. look for right mds for this
1586                          * name */
1587                         mea_idx = raw_name2idx(obj->lo_hashtype,
1588                                                obj->lo_objcount,
1589                                                (char *)op_data->op_name,
1590                                                op_data->op_namelen);
1591                         op_data->op_fid1 = obj->lo_inodes[mea_idx].li_fid;
1592                         tgt_exp = lmv_get_export(lmv, obj->lo_inodes[mea_idx].li_mds);
1593                         lmv_obj_put(obj);
1594                 }
1595         }
1596
1597         if (tgt_exp == NULL)
1598                 tgt_exp = lmv_find_export(lmv, &op_data->op_fid1);
1599         if (IS_ERR(tgt_exp))
1600                 RETURN(PTR_ERR(tgt_exp));
1601
1602         CDEBUG(D_OTHER, "ENQUEUE '%s' on "DFID"\n", LL_IT2STR(it),
1603                PFID(&op_data->op_fid1));
1604
1605         rc = md_enqueue(tgt_exp, einfo, it, op_data, lockh,
1606                         lmm, lmmsize, extra_lock_flags);
1607
1608         if (rc == 0 && it->it_op == IT_OPEN)
1609                 rc = lmv_enqueue_remote(exp, einfo, it, op_data, lockh,
1610                                         lmm, lmmsize, extra_lock_flags);
1611         RETURN(rc);
1612 }
1613
1614 static int
1615 lmv_getattr_name(struct obd_export *exp, const struct lu_fid *fid,
1616                  struct obd_capa *oc, const char *filename, int namelen,
1617                  obd_valid valid, int ea_size, struct ptlrpc_request **request)
1618 {
1619         struct obd_device *obd = exp->exp_obd;
1620         struct lmv_obd *lmv = &obd->u.lmv;
1621         struct lu_fid rid = *fid;
1622         struct obd_export *tgt_exp;
1623         struct mdt_body *body;
1624         struct lmv_obj *obj;
1625         int rc, loop = 0;
1626         ENTRY;
1627
1628         rc = lmv_check_connect(obd);
1629         if (rc)
1630                 RETURN(rc);
1631
1632 repeat:
1633         ++loop;
1634         LASSERT(loop <= 2);
1635         obj = lmv_obj_grab(obd, &rid);
1636         if (obj) {
1637                 int mea_idx;
1638
1639                 /* Directory is split. Look for right mds for this name */
1640                 mea_idx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1641                                        filename, namelen - 1);
1642                 rid = obj->lo_inodes[mea_idx].li_fid;
1643                 tgt_exp = lmv_get_export(lmv, obj->lo_inodes[mea_idx].li_mds);
1644                 lmv_obj_put(obj);
1645                 valid &= ~OBD_MD_FLCKSPLIT;
1646         } else {
1647                 tgt_exp = lmv_find_export(lmv, &rid);
1648                 valid |= OBD_MD_FLCKSPLIT;
1649         }
1650         if (IS_ERR(tgt_exp))
1651                 RETURN(PTR_ERR(tgt_exp));
1652
1653         CDEBUG(D_OTHER, "getattr_name for %*s on "DFID" -> "DFID"\n",
1654                namelen, filename, PFID(fid), PFID(&rid));
1655
1656         rc = md_getattr_name(tgt_exp, &rid, oc, filename, namelen, valid,
1657                              ea_size, request);
1658         if (rc == 0) {
1659                 body = lustre_msg_buf((*request)->rq_repmsg,
1660                                       REQ_REC_OFF, sizeof(*body));
1661                 LASSERT(body != NULL);
1662                 LASSERT(lustre_rep_swabbed(*request, REQ_REC_OFF));
1663
1664                 if (body->valid & OBD_MD_MDS) {
1665                         struct ptlrpc_request *req = NULL;
1666
1667                         rid = body->fid1;
1668                         CDEBUG(D_OTHER, "request attrs for "DFID"\n",
1669                                PFID(&rid));
1670
1671                         tgt_exp = lmv_find_export(lmv, &rid);
1672                         if (IS_ERR(tgt_exp)) {
1673                                 ptlrpc_req_finished(*request);
1674                                 RETURN(PTR_ERR(tgt_exp));
1675                         }
1676
1677                         rc = md_getattr_name(tgt_exp, &rid, NULL, NULL, 1,
1678                                              valid | OBD_MD_FLCROSSREF,
1679                                              ea_size, &req);
1680                         ptlrpc_req_finished(*request);
1681                         *request = req;
1682                 }
1683         } else if (rc == -ERESTART) {
1684                 LASSERT(*request != NULL);
1685                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1686                           "Got -ERESTART during getattr!\n");
1687                 ptlrpc_req_finished(*request);
1688                 *request = NULL;
1689
1690                 /*
1691                  * Directory got split. Time to update local object and repeat
1692                  * the request with proper MDS.
1693                  */
1694                 rc = lmv_handle_split(exp, &rid);
1695                 if (rc == 0)
1696                         goto repeat;
1697         }
1698         RETURN(rc);
1699 }
1700
1701 #define md_op_data_fid(op_data, fl)                     \
1702         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1703          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1704          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1705          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1706          NULL)
1707
1708 /* @tgt_exp is the export the metadata request is sent.
1709  * @fid_exp is the export the cancel should be sent for the current fid.
1710  * if @fid_exp is NULL, the export is found for the current fid.
1711  * @op_data keeps the current fid, which is pointed through @flag.
1712  * @mode, @bits -- lock match parameters. */
1713 static int lmv_early_cancel(struct lmv_obd *lmv, struct obd_export *tgt_exp,
1714                             struct obd_export *fid_exp,
1715                             struct md_op_data *op_data,
1716                             ldlm_mode_t mode, int bits, int flag)
1717 {
1718         struct lu_fid *fid = md_op_data_fid(op_data, flag);
1719         ldlm_policy_data_t policy = {{0}};
1720         int rc = 0;
1721         ENTRY;
1722
1723         if (!fid_is_sane(fid))
1724                 RETURN(0);
1725
1726         if (fid_exp == NULL)
1727                 fid_exp = lmv_find_export(lmv, fid);
1728
1729         if (tgt_exp == fid_exp) {
1730                 /* The export is the same as on the target server, cancel
1731                  * will be sent along with the main metadata operation. */
1732                 op_data->op_flags |= flag;
1733                 RETURN(0);
1734         }
1735
1736         policy.l_inodebits.bits = bits;
1737         rc = md_cancel_unused(fid_exp, fid, &policy, mode, LDLM_FL_ASYNC, NULL);
1738         RETURN(rc);
1739 }
1740
1741 #ifdef EARLY_CANCEL_FOR_STRIPED_DIR_IS_READY
1742 /* Check if the fid in @op_data pointed to by flag is of the same export(s)
1743  * as @tgt_exp. Early cancels will be sent later by mdc code, otherwise, call
1744  * md_cancel_unused for child export(s). */
1745 static int lmv_early_cancel_stripes(struct obd_export *exp,
1746                                     struct obd_export *tgt_exp,
1747                                     struct md_op_data *op_data,
1748                                     ldlm_mode_t mode, int bits, int flag)
1749 {
1750         struct lu_fid *fid = md_op_data_fid(op_data, flag);
1751         struct obd_device *obd = exp->exp_obd;
1752         struct lmv_obd *lmv = &obd->u.lmv;
1753         struct obd_export *st_exp;
1754         struct lmv_obj *obj;
1755         int rc = 0;
1756         ENTRY;
1757
1758         if (!fid_is_sane(fid))
1759                 RETURN(0);
1760
1761         obj = lmv_obj_grab(obd, fid);
1762         if (obj) {
1763                 ldlm_policy_data_t policy = {{0}};
1764                 struct lu_fid *st_fid;
1765                 int i;
1766
1767                 policy.l_inodebits.bits = bits;
1768                 for (i = 0; i < obj->lo_objcount; i++) {
1769                         st_exp = lmv_get_export(lmv, obj->lo_inodes[i].li_mds);
1770                         st_fid = &obj->lo_inodes[i].li_fid;
1771                         if (tgt_exp != st_exp) {
1772                                 rc = md_cancel_unused(st_exp, st_fid, &policy,
1773                                                       mode, LDLM_FL_ASYNC,
1774                                                       NULL);
1775                                 if (rc)
1776                                         break;
1777                         } else {
1778                                 /* Some export matches to @tgt_exp, do cancel
1779                                  * for its fid in mdc */
1780                                 *fid = *st_fid;
1781                                 op_data->op_flags |= flag;
1782                         }
1783                 }
1784                 lmv_obj_put(obj);
1785         } else {
1786                 rc = lmv_early_cancel(lmv, tgt_exp, NULL, op_data,
1787                                       mode, bits, flag);
1788         }
1789         RETURN(rc);
1790 }
1791 #endif
1792
1793 /*
1794  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1795  * op_data->op_fid2
1796  */
1797 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1798                     struct ptlrpc_request **request)
1799 {
1800         struct obd_device *obd = exp->exp_obd;
1801         struct lmv_obd *lmv = &obd->u.lmv;
1802         struct obd_export *tgt_exp;
1803         struct lmv_obj *obj;
1804         int rc, loop = 0;
1805         mdsno_t mds;
1806         ENTRY;
1807
1808         rc = lmv_check_connect(obd);
1809         if (rc)
1810                 RETURN(rc);
1811
1812 repeat:
1813         ++loop;
1814         LASSERT(loop <= 2);
1815         if (op_data->op_namelen != 0) {
1816                 int mea_idx;
1817
1818                 /* Usual link request */
1819                 obj = lmv_obj_grab(obd, &op_data->op_fid2);
1820                 if (obj) {
1821                         mea_idx = raw_name2idx(obj->lo_hashtype,
1822                                                obj->lo_objcount,
1823                                                op_data->op_name,
1824                                                op_data->op_namelen);
1825                         op_data->op_fid2 = obj->lo_inodes[mea_idx].li_fid;
1826                         mds = obj->lo_inodes[mea_idx].li_mds;
1827                         lmv_obj_put(obj);
1828                 } else {
1829                         rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds);
1830                         if (rc)
1831                                 RETURN(rc);
1832                 }
1833
1834                 CDEBUG(D_OTHER,"link "DFID":%*s to "DFID"\n",
1835                        PFID(&op_data->op_fid2), op_data->op_namelen,
1836                        op_data->op_name, PFID(&op_data->op_fid1));
1837         } else {
1838                 rc = lmv_fld_lookup(lmv, &op_data->op_fid1, &mds);
1839                 if (rc)
1840                         RETURN(rc);
1841
1842                 /* request from MDS to acquire i_links for inode by fid1 */
1843                 CDEBUG(D_OTHER, "inc i_nlinks for "DFID"\n",
1844                        PFID(&op_data->op_fid1));
1845         }
1846
1847         CDEBUG(D_OTHER, "forward to MDS #"LPU64" ("DFID")\n",
1848                mds, PFID(&op_data->op_fid1));
1849
1850         op_data->op_fsuid = current->fsuid;
1851         op_data->op_fsgid = current->fsgid;
1852         op_data->op_cap   = current->cap_effective;
1853
1854         tgt_exp = lmv->tgts[mds].ltd_exp;
1855         if (op_data->op_namelen) {
1856                 op_data->op_flags |= MF_MDC_CANCEL_FID2;
1857                 /* Cancel UPDATE lock on child (fid1). */
1858                 rc = lmv_early_cancel(lmv, tgt_exp, NULL, op_data, LCK_EX,
1859                                       MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
1860         }
1861         if (rc == 0)
1862                 rc = md_link(tgt_exp, op_data, request);
1863         if (rc == -ERESTART) {
1864                 LASSERT(*request != NULL);
1865                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1866                           "Got -ERESTART during link!\n");
1867                 ptlrpc_req_finished(*request);
1868                 *request = NULL;
1869
1870                 /*
1871                  * Directory got split. Time to update local object and repeat
1872                  * the request with proper MDS.
1873                  */
1874                 rc = lmv_handle_split(exp, &op_data->op_fid2);
1875                 if (rc == 0)
1876                         goto repeat;
1877         }
1878
1879         RETURN(rc);
1880 }
1881
1882 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
1883                       const char *old, int oldlen, const char *new, int newlen,
1884                       struct ptlrpc_request **request)
1885 {
1886         struct obd_export *tgt_exp = NULL, *src_exp;
1887         struct obd_device *obd = exp->exp_obd;
1888         struct lmv_obd *lmv = &obd->u.lmv;
1889         int rc, mea_idx, loop = 0;
1890         struct lmv_obj *obj;
1891         mdsno_t mds1, mds2;
1892         ENTRY;
1893
1894         CDEBUG(D_OTHER, "rename %*s in "DFID" to %*s in "DFID"\n",
1895                oldlen, old, PFID(&op_data->op_fid1),
1896                newlen, new, PFID(&op_data->op_fid2));
1897
1898         rc = lmv_check_connect(obd);
1899         if (rc)
1900                 RETURN(rc);
1901
1902         if (oldlen == 0) {
1903                 /*
1904                  * MDS with old dir entry is asking another MDS to create name
1905                  * there.
1906                  */
1907                 CDEBUG(D_OTHER,
1908                        "create %*s(%d/%d) in "DFID" pointing "
1909                        "to "DFID"\n", newlen, new, oldlen, newlen,
1910                        PFID(&op_data->op_fid2), PFID(&op_data->op_fid1));
1911
1912                 rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds1);
1913                 if (rc)
1914                         RETURN(rc);
1915
1916                 /*
1917                  * Target directory can be split, sowe should forward request to
1918                  * the right MDS.
1919                  */
1920                 obj = lmv_obj_grab(obd, &op_data->op_fid2);
1921                 if (obj) {
1922                         mea_idx = raw_name2idx(obj->lo_hashtype,
1923                                                obj->lo_objcount,
1924                                                (char *)new, newlen);
1925                         op_data->op_fid2 = obj->lo_inodes[mea_idx].li_fid;
1926                         CDEBUG(D_OTHER, "Parent obj "DFID"\n",
1927                                PFID(&op_data->op_fid2));
1928                         lmv_obj_put(obj);
1929                 }
1930                 goto request;
1931         }
1932
1933 repeat:
1934         ++loop;
1935         LASSERT(loop <= 2);
1936         obj = lmv_obj_grab(obd, &op_data->op_fid1);
1937         if (obj) {
1938                 /*
1939                  * directory is already split, so we have to forward request to
1940                  * the right MDS.
1941                  */
1942                 mea_idx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1943                                        (char *)old, oldlen);
1944                 op_data->op_fid1 = obj->lo_inodes[mea_idx].li_fid;
1945                 mds1 = obj->lo_inodes[mea_idx].li_mds;
1946                 CDEBUG(D_OTHER, "Parent obj "DFID"\n", PFID(&op_data->op_fid1));
1947                 lmv_obj_put(obj);
1948         } else {
1949                 rc = lmv_fld_lookup(lmv, &op_data->op_fid1, &mds1);
1950                 if (rc)
1951                         RETURN(rc);
1952         }
1953
1954         obj = lmv_obj_grab(obd, &op_data->op_fid2);
1955         if (obj) {
1956                 /*
1957                  * Directory is already split, so we have to forward request to
1958                  * the right MDS.
1959                  */
1960                 mea_idx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1961                                        (char *)new, newlen);
1962
1963                 mds2 = obj->lo_inodes[mea_idx].li_mds;
1964                 op_data->op_fid2 = obj->lo_inodes[mea_idx].li_fid;
1965                 CDEBUG(D_OTHER, "Parent obj "DFID"\n", PFID(&op_data->op_fid2));
1966                 lmv_obj_put(obj);
1967         } else {
1968                 rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds2);
1969                 if (rc)
1970                         RETURN(rc);
1971         }
1972
1973 request:
1974         op_data->op_fsuid = current->fsuid;
1975         op_data->op_fsgid = current->fsgid;
1976         op_data->op_cap   = current->cap_effective;
1977
1978         src_exp = lmv_get_export(lmv, mds1);
1979         tgt_exp = lmv_get_export(lmv, mds2);
1980         if (oldlen) {
1981                 /* LOOKUP lock on src child (fid3) should also be cancelled for
1982                  * src_exp in mdc_rename. */
1983                 op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
1984
1985                 /* Cancel UPDATE locks on tgt parent (fid2), tgt_exp is its
1986                  * own export. */
1987                 rc = lmv_early_cancel(lmv, src_exp, tgt_exp, op_data, LCK_EX,
1988                                       MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
1989
1990                 /* Cancel LOOKUP locks on tgt child (fid4) for parent tgt_exp.*/
1991                 if (rc == 0)
1992                         rc = lmv_early_cancel(lmv, src_exp, tgt_exp, op_data,
1993                                               LCK_EX, MDS_INODELOCK_LOOKUP,
1994                                               MF_MDC_CANCEL_FID4);
1995
1996                 /* XXX: the case when child is a striped dir is not supported.
1997                  * Only the master stripe has all locks cancelled early. */
1998                 /* Cancel all the locks on tgt child (fid4). */
1999                 if (rc == 0)
2000                         rc = lmv_early_cancel(lmv, src_exp, NULL, op_data,
2001                                               LCK_EX, MDS_INODELOCK_FULL,
2002                                               MF_MDC_CANCEL_FID4);
2003         }
2004
2005         if (rc == 0)
2006                 rc = md_rename(src_exp, op_data, old, oldlen,
2007                                new, newlen, request);
2008         if (rc == -ERESTART) {
2009                 LASSERT(*request != NULL);
2010                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2011                           "Got -ERESTART during rename!\n");
2012                 ptlrpc_req_finished(*request);
2013                 *request = NULL;
2014
2015                 /*
2016                  * Directory got split. Time to update local object and repeat
2017                  * the request with proper MDS.
2018                  */
2019                 rc = lmv_handle_split(exp, &op_data->op_fid1);
2020                 if (rc == 0)
2021                         goto repeat;
2022         }
2023         RETURN(rc);
2024 }
2025
2026 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2027                        void *ea, int ealen, void *ea2, int ea2len,
2028                        struct ptlrpc_request **request,
2029                        struct md_open_data **mod)
2030 {
2031         struct obd_device *obd = exp->exp_obd;
2032         struct lmv_obd *lmv = &obd->u.lmv;
2033         struct ptlrpc_request *req;
2034         struct obd_export *tgt_exp;
2035         struct lmv_obj *obj;
2036         int rc = 0, i;
2037         ENTRY;
2038
2039         rc = lmv_check_connect(obd);
2040         if (rc)
2041                 RETURN(rc);
2042
2043         obj = lmv_obj_grab(obd, &op_data->op_fid1);
2044
2045         CDEBUG(D_OTHER, "SETATTR for "DFID", valid 0x%x%s\n",
2046                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid,
2047                obj ? ", split" : "");
2048
2049         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2050         if (obj) {
2051                 for (i = 0; i < obj->lo_objcount; i++) {
2052                         op_data->op_fid1 = obj->lo_inodes[i].li_fid;
2053
2054                         tgt_exp = lmv_get_export(lmv, obj->lo_inodes[i].li_mds);
2055                         if (IS_ERR(tgt_exp)) {
2056                                 rc = PTR_ERR(tgt_exp);
2057                                 break;
2058                         }
2059
2060                         rc = md_setattr(tgt_exp, op_data, ea, ealen,
2061                                         ea2, ea2len, &req, mod);
2062
2063                         if (lu_fid_eq(&obj->lo_fid, &obj->lo_inodes[i].li_fid)) {
2064                                 /*
2065                                  * this is master object and this request should
2066                                  * be returned back to llite.
2067                                  */
2068                                 *request = req;
2069                         } else {
2070                                 ptlrpc_req_finished(req);
2071                         }
2072
2073                         if (rc)
2074                                 break;
2075                 }
2076                 lmv_obj_put(obj);
2077         } else {
2078                 tgt_exp = lmv_find_export(lmv, &op_data->op_fid1);
2079                 if (IS_ERR(tgt_exp))
2080                         RETURN(PTR_ERR(tgt_exp));
2081
2082                 rc = md_setattr(tgt_exp, op_data, ea, ealen, ea2,
2083                                 ea2len, request, mod);
2084         }
2085         RETURN(rc);
2086 }
2087
2088 static int lmv_sync(struct obd_export *exp, const struct lu_fid *fid,
2089                     struct obd_capa *oc, struct ptlrpc_request **request)
2090 {
2091         struct obd_device *obd = exp->exp_obd;
2092         struct lmv_obd *lmv = &obd->u.lmv;
2093         struct obd_export *tgt_exp;
2094         int rc;
2095         ENTRY;
2096
2097         rc = lmv_check_connect(obd);
2098         if (rc)
2099                 RETURN(rc);
2100
2101         tgt_exp = lmv_find_export(lmv, fid);
2102         if (IS_ERR(tgt_exp))
2103                 RETURN(PTR_ERR(tgt_exp));
2104
2105         rc = md_sync(tgt_exp, fid, oc, request);
2106         RETURN(rc);
2107 }
2108
2109 /* main purpose of LMV blocking ast is to remove split directory LMV
2110  * presentation object (struct lmv_obj) attached to the lock being revoked. */
2111 int lmv_blocking_ast(struct ldlm_lock *lock,
2112                      struct ldlm_lock_desc *desc,
2113                      void *data, int flag)
2114 {
2115         struct lustre_handle lockh;
2116         struct lmv_obj *obj;
2117         int rc;
2118         ENTRY;
2119
2120         switch (flag) {
2121         case LDLM_CB_BLOCKING:
2122                 ldlm_lock2handle(lock, &lockh);
2123                 rc = ldlm_cli_cancel(&lockh);
2124                 if (rc < 0) {
2125                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2126                         RETURN(rc);
2127                 }
2128                 break;
2129         case LDLM_CB_CANCELING:
2130                 /* time to drop cached attrs for dirobj */
2131                 obj = lock->l_ast_data;
2132                 if (obj) {
2133                         CDEBUG(D_OTHER, "cancel %s on "LPU64"/"LPU64
2134                                ", master "DFID"\n",
2135                                lock->l_resource->lr_name.name[3] == 1 ?
2136                                "LOOKUP" : "UPDATE",
2137                                lock->l_resource->lr_name.name[0],
2138                                lock->l_resource->lr_name.name[1],
2139                                PFID(&obj->lo_fid));
2140                         lmv_obj_put(obj);
2141                 }
2142                 break;
2143         default:
2144                 LBUG();
2145         }
2146         RETURN(0);
2147 }
2148
2149 static void lmv_hash_adjust(__u32 *hash, __u32 hash_adj)
2150 {
2151         __u32 val;
2152
2153         val = le32_to_cpu(*hash);
2154         if (val < hash_adj)
2155                 val += MAX_HASH_SIZE;
2156         if (val != DIR_END_OFF)
2157                 *hash = cpu_to_le32(val - hash_adj);
2158 }
2159
2160 static __u32 lmv_node_rank(struct obd_export *exp, const struct lu_fid *fid)
2161 {
2162         __u64 id;
2163         struct obd_import *imp;
2164
2165         /*
2166          * XXX Hack: to get nid we assume that underlying obd device is mdc.
2167          */
2168         imp  = class_exp2cliimp(exp);
2169         id   = imp->imp_connection->c_self + fid_flatten(fid);
2170
2171         CDEBUG(D_INFO, "node rank: %llx "DFID" %llx %llx\n",
2172                imp->imp_connection->c_self, PFID(fid), id, id ^ (id >> 32));
2173
2174         return id ^ (id >> 32);
2175 }
2176
2177 static int lmv_readpage(struct obd_export *exp, const struct lu_fid *fid,
2178                         struct obd_capa *oc, __u64 offset64, struct page *page,
2179                         struct ptlrpc_request **request)
2180 {
2181         struct obd_device *obd = exp->exp_obd;
2182         struct lmv_obd *lmv = &obd->u.lmv;
2183         struct obd_export *tgt_exp;
2184         struct lu_fid rid = *fid;
2185         struct lmv_obj *obj;
2186         __u32 offset0;
2187         __u32 offset;
2188         __u32 hash_adj = 0;
2189         __u32 rank = 0;
2190         __u32 seg_size = 0;
2191         int tgt = 0;
2192         int tgt0 = 0;
2193         int rc;
2194         int nr = 0;
2195         ENTRY;
2196
2197         offset0 = offset = offset64;
2198         /*
2199          * Check that offset is representable by 32bit number.
2200          */
2201         LASSERT((__u64)offset == offset64);
2202
2203         rc = lmv_check_connect(obd);
2204         if (rc)
2205                 RETURN(rc);
2206
2207         CDEBUG(D_INFO, "READPAGE at %x from "DFID"\n", offset, PFID(&rid));
2208
2209         obj = lmv_obj_grab(obd, fid);
2210         if (obj) {
2211                 struct lmv_inode *loi;
2212
2213                 lmv_obj_lock(obj);
2214
2215                 nr       = obj->lo_objcount;
2216                 LASSERT(nr > 0);
2217                 seg_size = MAX_HASH_SIZE / nr;
2218                 loi      = obj->lo_inodes;
2219                 rank     = lmv_node_rank(lmv_get_export(lmv, loi[0].li_mds),
2220                                          fid) % nr;
2221                 tgt0     = (offset / seg_size) % nr;
2222                 tgt      = (tgt0 + rank) % nr;
2223
2224                 if (tgt < tgt0)
2225                         /*
2226                          * Wrap around.
2227                          *
2228                          * Last segment has unusual length due to division
2229                          * rounding.
2230                          */
2231                         hash_adj = MAX_HASH_SIZE - seg_size * nr;
2232                 else
2233                         hash_adj = 0;
2234
2235                 hash_adj += rank * seg_size;
2236
2237                 CDEBUG(D_INFO, "hash_adj: %x %x %x/%x -> %x/%x\n",
2238                        rank, hash_adj, offset, tgt0, offset + hash_adj, tgt);
2239
2240                 offset = (offset + hash_adj) % MAX_HASH_SIZE;
2241                 rid = obj->lo_inodes[tgt].li_fid;
2242                 tgt_exp = lmv_get_export(lmv, loi[tgt].li_mds);
2243
2244                 CDEBUG(D_INFO, "forward to "DFID" with offset %lu i %d\n",
2245                        PFID(&rid), (unsigned long)offset, tgt);
2246         } else
2247                 tgt_exp = lmv_find_export(lmv, &rid);
2248
2249         if (IS_ERR(tgt_exp))
2250                 GOTO(cleanup, rc = PTR_ERR(tgt_exp));
2251
2252         rc = md_readpage(tgt_exp, &rid, oc, offset, page, request);
2253         if (rc)
2254                 GOTO(cleanup, rc);
2255         if (obj) {
2256                 struct lu_dirpage *dp;
2257                 struct lu_dirent  *ent;
2258
2259                 dp = cfs_kmap(page);
2260
2261                 lmv_hash_adjust(&dp->ldp_hash_start, hash_adj);
2262                 lmv_hash_adjust(&dp->ldp_hash_end,   hash_adj);
2263                 LASSERT(cpu_to_le32(dp->ldp_hash_start) <= offset0);
2264
2265                 for (ent = lu_dirent_start(dp); ent != NULL;
2266                      ent = lu_dirent_next(ent))
2267                         lmv_hash_adjust(&ent->lde_hash, hash_adj);
2268
2269                 if (tgt0 != nr - 1) {
2270                         __u32 end;
2271
2272                         end = le32_to_cpu(dp->ldp_hash_end);
2273                         if (end == DIR_END_OFF) {
2274                                 dp->ldp_hash_end = cpu_to_le32(seg_size *
2275                                                                (tgt0 + 1));
2276                                 CDEBUG(D_INFO, ""DFID" reset end %x tgt %d\n",
2277                                        PFID(&rid),
2278                                        le32_to_cpu(dp->ldp_hash_end), tgt);
2279                         }
2280                 }
2281                 cfs_kunmap(page);
2282         }
2283         /*
2284          * Here we could remove "." and ".." from all pages which at not from
2285          * master. But MDS has only "." and ".." for master dir.
2286          */
2287         EXIT;
2288 cleanup:
2289         if (obj) {
2290                 lmv_obj_unlock(obj);
2291                 lmv_obj_put(obj);
2292         }
2293         return rc;
2294 }
2295
2296 static int lmv_unlink_slaves(struct obd_export *exp,
2297                              struct md_op_data *op_data,
2298                              struct ptlrpc_request **req)
2299 {
2300         struct obd_device *obd = exp->exp_obd;
2301         struct lmv_obd *lmv = &obd->u.lmv;
2302         struct lmv_stripe_md *mea = op_data->op_mea1;
2303         struct md_op_data *op_data2;
2304         struct obd_export *tgt_exp;
2305         int i, rc = 0;
2306         ENTRY;
2307
2308         OBD_ALLOC_PTR(op_data2);
2309         if (op_data2 == NULL)
2310                 RETURN(-ENOMEM);
2311
2312         op_data2->op_mode = S_IFDIR;
2313         op_data2->op_fsuid = current->fsuid;
2314         op_data2->op_fsgid = current->fsgid;
2315         op_data2->op_bias = 0;
2316
2317         LASSERT(mea != NULL);
2318         for (i = 0; i < mea->mea_count; i++) {
2319                 memset(op_data2, 0, sizeof(*op_data2));
2320                 op_data2->op_fid1 = mea->mea_ids[i];
2321                 tgt_exp = lmv_find_export(lmv, &op_data2->op_fid1);
2322                 if (IS_ERR(tgt_exp))
2323                         GOTO(out_free_op_data2, rc = PTR_ERR(tgt_exp));
2324
2325                 if (tgt_exp == NULL)
2326                         continue;
2327
2328                 rc = md_unlink(tgt_exp, op_data2, req);
2329
2330                 CDEBUG(D_OTHER, "unlink slave "DFID" -> %d\n",
2331                        PFID(&mea->mea_ids[i]), rc);
2332
2333                 if (*req) {
2334                         ptlrpc_req_finished(*req);
2335                         *req = NULL;
2336                 }
2337                 if (rc)
2338                         GOTO(out_free_op_data2, rc);
2339         }
2340
2341         EXIT;
2342 out_free_op_data2:
2343         OBD_FREE_PTR(op_data2);
2344         return rc;
2345 }
2346
2347 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2348                       struct ptlrpc_request **request)
2349 {
2350         struct obd_device *obd = exp->exp_obd;
2351         struct lmv_obd *lmv = &obd->u.lmv;
2352         struct obd_export *tgt_exp = NULL;
2353         struct lmv_obj *obj;
2354         int rc, loop = 0;
2355         ENTRY;
2356
2357         rc = lmv_check_connect(obd);
2358         if (rc)
2359                 RETURN(rc);
2360
2361         if (op_data->op_namelen == 0 && op_data->op_mea1 != NULL) {
2362                 /* mds asks to remove slave objects */
2363                 rc = lmv_unlink_slaves(exp, op_data, request);
2364                 RETURN(rc);
2365         }
2366
2367 repeat:
2368         ++loop;
2369         LASSERT(loop <= 2);
2370         if (op_data->op_namelen != 0) {
2371                 int mea_idx;
2372
2373                 obj = lmv_obj_grab(obd, &op_data->op_fid1);
2374                 if (obj) {
2375                         mea_idx = raw_name2idx(obj->lo_hashtype,
2376                                                obj->lo_objcount,
2377                                                op_data->op_name,
2378                                                op_data->op_namelen);
2379                         op_data->op_bias &= ~MDS_CHECK_SPLIT;
2380                         op_data->op_fid1 = obj->lo_inodes[mea_idx].li_fid;
2381                         tgt_exp = lmv_get_export(lmv,
2382                                                  obj->lo_inodes[mea_idx].li_mds);
2383                         lmv_obj_put(obj);
2384                         CDEBUG(D_OTHER, "unlink '%*s' in "DFID" -> %u\n",
2385                                op_data->op_namelen, op_data->op_name,
2386                                PFID(&op_data->op_fid1), mea_idx);
2387                 }
2388         } else {
2389                 CDEBUG(D_OTHER, "drop i_nlink on "DFID"\n",
2390                        PFID(&op_data->op_fid1));
2391         }
2392         if (tgt_exp == NULL) {
2393                 tgt_exp = lmv_find_export(lmv, &op_data->op_fid1);
2394                 if (IS_ERR(tgt_exp))
2395                         RETURN(PTR_ERR(tgt_exp));
2396                 op_data->op_bias |= MDS_CHECK_SPLIT;
2397         }
2398
2399         op_data->op_fsuid = current->fsuid;
2400         op_data->op_fsgid = current->fsgid;
2401         op_data->op_cap   = current->cap_effective;
2402
2403         /* If child's fid is given, cancel unused locks for it if it is from
2404          * another export than parent. */
2405         if (op_data->op_namelen) {
2406                 /* LOOKUP lock for child (fid3) should also be cancelled on
2407                  * parent tgt_exp in mdc_unlink(). */
2408                 op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2409
2410                 /* XXX: the case when child is a striped dir is not supported.
2411                  * Only the master stripe has all locks cancelled early. */
2412                 /* Cancel FULL locks on child (fid3). */
2413                 rc = lmv_early_cancel(lmv, tgt_exp, NULL, op_data, LCK_EX,
2414                                       MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2415         }
2416         if (rc == 0)
2417                 rc = md_unlink(tgt_exp, op_data, request);
2418         if (rc == -ERESTART) {
2419                 LASSERT(*request != NULL);
2420                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2421                           "Got -ERESTART during unlink!\n");
2422                 ptlrpc_req_finished(*request);
2423                 *request = NULL;
2424
2425                 /*
2426                  * Directory got split. Time to update local object and repeat
2427                  * the request with proper MDS.
2428                  */
2429                 rc = lmv_handle_split(exp, &op_data->op_fid1);
2430                 if (rc == 0)
2431                         goto repeat;
2432         }
2433         RETURN(rc);
2434 }
2435
2436 static int lmv_llog_init(struct obd_device *obd, struct obd_llogs* llogs,
2437                          struct obd_device *tgt, int count,
2438                          struct llog_catid *logid, struct obd_uuid *uuid)
2439 {
2440         struct llog_ctxt *ctxt;
2441         int rc;
2442         ENTRY;
2443
2444         rc = llog_setup(obd, llogs, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
2445                         &llog_client_ops);
2446         if (rc == 0) {
2447                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
2448                 ctxt->loc_imp = tgt->u.cli.cl_import;
2449         }
2450
2451         RETURN(rc);
2452 }
2453
2454 static int lmv_llog_finish(struct obd_device *obd, int count)
2455 {
2456         int rc;
2457         ENTRY;
2458
2459         rc = llog_cleanup(llog_get_context(obd, LLOG_CONFIG_REPL_CTXT));
2460         RETURN(rc);
2461 }
2462
2463 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2464 {
2465         int rc = 0;
2466
2467         switch (stage) {
2468         case OBD_CLEANUP_EARLY:
2469                 /* XXX: here should be calling obd_precleanup() down to
2470                  * stack. */
2471                 break;
2472         case OBD_CLEANUP_SELF_EXP:
2473                 rc = obd_llog_finish(obd, 0);
2474                 if (rc != 0)
2475                         CERROR("failed to cleanup llogging subsystems\n");
2476                 break;
2477         default:
2478                 break;
2479         }
2480         RETURN(rc);
2481 }
2482
2483 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
2484                         void *key, __u32 *vallen, void *val)
2485 {
2486         struct obd_device *obd;
2487         struct lmv_obd *lmv;
2488         int rc = 0;
2489         ENTRY;
2490
2491         obd = class_exp2obd(exp);
2492         if (obd == NULL) {
2493                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2494                        exp->exp_handle.h_cookie);
2495                 RETURN(-EINVAL);
2496         }
2497
2498         lmv = &obd->u.lmv;
2499         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2500                 struct lmv_tgt_desc *tgts;
2501                 int i;
2502
2503                 rc = lmv_check_connect(obd);
2504                 if (rc)
2505                         RETURN(rc);
2506
2507                 LASSERT(*vallen == sizeof(__u32));
2508                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count;
2509                      i++, tgts++) {
2510
2511                         /* all tgts should be connected when this get called. */
2512                         if (!tgts || !tgts->ltd_exp) {
2513                                 CERROR("target not setup?\n");
2514                                 continue;
2515                         }
2516
2517                         if (!obd_get_info(tgts->ltd_exp, keylen, key,
2518                                           vallen, val))
2519                                 RETURN(0);
2520                 }
2521                 RETURN(-EINVAL);
2522         } else if (KEY_IS(KEY_MAX_EASIZE) || KEY_IS(KEY_CONN_DATA)) {
2523                 rc = lmv_check_connect(obd);
2524                 if (rc)
2525                         RETURN(rc);
2526
2527                 /* forwarding this request to first MDS, it should know LOV
2528                  * desc. */
2529                 rc = obd_get_info(lmv->tgts[0].ltd_exp, keylen, key,
2530                                   vallen, val);
2531                 if (!rc && KEY_IS(KEY_CONN_DATA)) {
2532                         exp->exp_connect_flags =
2533                         ((struct obd_connect_data *)val)->ocd_connect_flags;
2534                 }
2535                 RETURN(rc);
2536         }
2537
2538         CDEBUG(D_IOCTL, "invalid key\n");
2539         RETURN(-EINVAL);
2540 }
2541
2542 int lmv_set_info_async(struct obd_export *exp, obd_count keylen,
2543                        void *key, obd_count vallen, void *val,
2544                        struct ptlrpc_request_set *set)
2545 {
2546         struct lmv_tgt_desc    *tgt;
2547         struct obd_device      *obd;
2548         struct lmv_obd         *lmv;
2549         int rc = 0;
2550         ENTRY;
2551
2552         obd = class_exp2obd(exp);
2553         if (obd == NULL) {
2554                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2555                        exp->exp_handle.h_cookie);
2556                 RETURN(-EINVAL);
2557         }
2558         lmv = &obd->u.lmv;
2559
2560         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
2561             KEY_IS(KEY_INIT_RECOV_BACKUP)) {
2562                 int i, err = 0;
2563
2564                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2565                         tgt = &lmv->tgts[i];
2566
2567                         if (!tgt->ltd_exp)
2568                                 continue;
2569
2570                         err = obd_set_info_async(tgt->ltd_exp,
2571                                                  keylen, key, vallen, val, set);
2572                         if (err && rc == 0)
2573                                 rc = err;
2574                 }
2575
2576                 RETURN(rc);
2577         }
2578
2579         RETURN(-EINVAL);
2580 }
2581
2582 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
2583                struct lov_stripe_md *lsm)
2584 {
2585         struct obd_device *obd = class_exp2obd(exp);
2586         struct lmv_obd *lmv = &obd->u.lmv;
2587         struct lmv_stripe_md *meap, *lsmp;
2588         int mea_size, i;
2589         ENTRY;
2590
2591         mea_size = lmv_get_easize(lmv);
2592         if (!lmmp)
2593                 RETURN(mea_size);
2594
2595         if (*lmmp && !lsm) {
2596                 OBD_FREE(*lmmp, mea_size);
2597                 *lmmp = NULL;
2598                 RETURN(0);
2599         }
2600
2601         if (*lmmp == NULL) {
2602                 OBD_ALLOC(*lmmp, mea_size);
2603                 if (*lmmp == NULL)
2604                         RETURN(-ENOMEM);
2605         }
2606
2607         if (!lsm)
2608                 RETURN(mea_size);
2609
2610         lsmp = (struct lmv_stripe_md *)lsm;
2611         meap = (struct lmv_stripe_md *)*lmmp;
2612
2613         if (lsmp->mea_magic != MEA_MAGIC_LAST_CHAR &&
2614             lsmp->mea_magic != MEA_MAGIC_ALL_CHARS)
2615                 RETURN(-EINVAL);
2616
2617         meap->mea_magic = cpu_to_le32(lsmp->mea_magic);
2618         meap->mea_count = cpu_to_le32(lsmp->mea_count);
2619         meap->mea_master = cpu_to_le32(lsmp->mea_master);
2620
2621         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2622                 meap->mea_ids[i] = meap->mea_ids[i];
2623                 fid_cpu_to_le(&meap->mea_ids[i], &meap->mea_ids[i]);
2624         }
2625
2626         RETURN(mea_size);
2627 }
2628
2629 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2630                  struct lov_mds_md *lmm, int lmm_size)
2631 {
2632         struct obd_device *obd = class_exp2obd(exp);
2633         struct lmv_stripe_md **tmea = (struct lmv_stripe_md **)lsmp;
2634         struct lmv_stripe_md *mea = (struct lmv_stripe_md *)lmm;
2635         struct lmv_obd *lmv = &obd->u.lmv;
2636         int mea_size, i;
2637         __u32 magic;
2638         ENTRY;
2639
2640         mea_size = lmv_get_easize(lmv);
2641         if (lsmp == NULL)
2642                 return mea_size;
2643
2644         if (*lsmp != NULL && lmm == NULL) {
2645                 OBD_FREE(*tmea, mea_size);
2646                 *lsmp = NULL;
2647                 RETURN(0);
2648         }
2649
2650         LASSERT(mea_size == lmm_size);
2651
2652         OBD_ALLOC(*tmea, mea_size);
2653         if (*tmea == NULL)
2654                 RETURN(-ENOMEM);
2655
2656         if (!lmm)
2657                 RETURN(mea_size);
2658
2659         if (mea->mea_magic == MEA_MAGIC_LAST_CHAR ||
2660             mea->mea_magic == MEA_MAGIC_ALL_CHARS ||
2661             mea->mea_magic == MEA_MAGIC_HASH_SEGMENT)
2662         {
2663                 magic = le32_to_cpu(mea->mea_magic);
2664         } else {
2665                 /* old mea is not handled here */
2666                 LBUG();
2667         }
2668
2669         (*tmea)->mea_magic = magic;
2670         (*tmea)->mea_count = le32_to_cpu(mea->mea_count);
2671         (*tmea)->mea_master = le32_to_cpu(mea->mea_master);
2672
2673         for (i = 0; i < (*tmea)->mea_count; i++) {
2674                 (*tmea)->mea_ids[i] = mea->mea_ids[i];
2675                 fid_le_to_cpu(&(*tmea)->mea_ids[i], &(*tmea)->mea_ids[i]);
2676         }
2677         RETURN(mea_size);
2678 }
2679
2680 static int lmv_cancel_unused(struct obd_export *exp,
2681                              const struct lu_fid *fid,
2682                              ldlm_policy_data_t *policy,
2683                              ldlm_mode_t mode, int flags, void *opaque)
2684 {
2685         struct obd_device *obd = exp->exp_obd;
2686         struct lmv_obd *lmv = &obd->u.lmv;
2687         int rc = 0, err, i;
2688         ENTRY;
2689
2690         LASSERT(fid != NULL);
2691
2692         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2693                 if (!lmv->tgts[i].ltd_exp || !lmv->tgts[i].ltd_active)
2694                         continue;
2695
2696                 err = md_cancel_unused(lmv->tgts[i].ltd_exp, fid,
2697                                        policy, mode, flags, opaque);
2698                 if (!rc)
2699                         rc = err;
2700         }
2701         RETURN(rc);
2702 }
2703
2704 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data)
2705 {
2706         struct obd_device *obd = exp->exp_obd;
2707         struct lmv_obd *lmv = &obd->u.lmv;
2708
2709         ENTRY;
2710         RETURN(md_set_lock_data(lmv->tgts[0].ltd_exp, lockh, data));
2711 }
2712
2713 int lmv_lock_match(struct obd_export *exp, int flags,
2714                    const struct lu_fid *fid, ldlm_type_t type,
2715                    ldlm_policy_data_t *policy, ldlm_mode_t mode,
2716                    struct lustre_handle *lockh)
2717 {
2718         struct obd_device *obd = exp->exp_obd;
2719         struct lmv_obd *lmv = &obd->u.lmv;
2720         int i, rc = 0;
2721         ENTRY;
2722
2723         CDEBUG(D_OTHER, "lock match for "DFID"\n", PFID(fid));
2724
2725         /* with CMD every object can have two locks in different namespaces:
2726          * lookup lock in space of mds storing direntry and update/open lock in
2727          * space of mds storing inode. Thus we check all targets, not only that
2728          * one fid was created in. */
2729         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2730                 rc = md_lock_match(lmv->tgts[i].ltd_exp, flags, fid,
2731                                    type, policy, mode, lockh);
2732                 if (rc)
2733                         RETURN(1);
2734         }
2735
2736         RETURN(rc);
2737 }
2738
2739 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
2740                       int offset, struct obd_export *dt_exp,
2741                       struct obd_export *md_exp, struct lustre_md *md)
2742 {
2743         struct obd_device *obd = exp->exp_obd;
2744         struct lmv_obd *lmv = &obd->u.lmv;
2745         int rc;
2746
2747         ENTRY;
2748         rc = md_get_lustre_md(lmv->tgts[0].ltd_exp, req, offset, dt_exp, md_exp,
2749                               md);
2750         RETURN(rc);
2751 }
2752
2753 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
2754 {
2755         struct obd_device *obd = exp->exp_obd;
2756         struct lmv_obd *lmv = &obd->u.lmv;
2757
2758         ENTRY;
2759         if (md->mea)
2760                 obd_free_memmd(exp, (struct lov_stripe_md**)&md->mea);
2761         RETURN(md_free_lustre_md(lmv->tgts[0].ltd_exp, md));
2762 }
2763
2764 int lmv_set_open_replay_data(struct obd_export *exp,
2765                              struct obd_client_handle *och,
2766                              struct ptlrpc_request *open_req)
2767 {
2768         struct obd_device *obd = exp->exp_obd;
2769         struct lmv_obd *lmv = &obd->u.lmv;
2770         struct obd_export *tgt_exp;
2771
2772         ENTRY;
2773
2774         tgt_exp = lmv_find_export(lmv, &och->och_fid);
2775         if (IS_ERR(tgt_exp))
2776                 RETURN(PTR_ERR(tgt_exp));
2777
2778         RETURN(md_set_open_replay_data(tgt_exp, och, open_req));
2779 }
2780
2781 int lmv_clear_open_replay_data(struct obd_export *exp,
2782                                struct obd_client_handle *och)
2783 {
2784         struct obd_device *obd = exp->exp_obd;
2785         struct lmv_obd *lmv = &obd->u.lmv;
2786         struct obd_export *tgt_exp;
2787         ENTRY;
2788
2789         tgt_exp = lmv_find_export(lmv, &och->och_fid);
2790         if (IS_ERR(tgt_exp))
2791                 RETURN(PTR_ERR(tgt_exp));
2792
2793         RETURN(md_clear_open_replay_data(tgt_exp, och));
2794 }
2795
2796 static int lmv_get_remote_perm(struct obd_export *exp,
2797                                const struct lu_fid *fid,
2798                                struct obd_capa *oc,
2799                                struct ptlrpc_request **request)
2800 {
2801         struct obd_device *obd = exp->exp_obd;
2802         struct lmv_obd *lmv = &obd->u.lmv;
2803         struct obd_export *tgt_exp;
2804         int rc;
2805
2806         ENTRY;
2807
2808         rc = lmv_check_connect(obd);
2809         if (rc)
2810                 RETURN(rc);
2811
2812         tgt_exp = lmv_find_export(lmv, fid);
2813         if (IS_ERR(tgt_exp))
2814                 RETURN(PTR_ERR(tgt_exp));
2815
2816         rc = md_get_remote_perm(tgt_exp, fid, oc, request);
2817
2818         RETURN(rc);
2819 }
2820
2821 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
2822                           renew_capa_cb_t cb)
2823 {
2824         struct obd_device *obd = exp->exp_obd;
2825         struct lmv_obd *lmv = &obd->u.lmv;
2826         struct obd_export *tgt_exp;
2827         int rc;
2828         ENTRY;
2829
2830         rc = lmv_check_connect(obd);
2831         if (rc)
2832                 RETURN(rc);
2833
2834         tgt_exp = lmv_find_export(lmv, &oc->c_capa.lc_fid);
2835         if (IS_ERR(tgt_exp))
2836                 RETURN(PTR_ERR(tgt_exp));
2837
2838         rc = md_renew_capa(tgt_exp, oc, cb);
2839         RETURN(rc);
2840 }
2841
2842 struct obd_ops lmv_obd_ops = {
2843         .o_owner                = THIS_MODULE,
2844         .o_setup                = lmv_setup,
2845         .o_cleanup              = lmv_cleanup,
2846         .o_precleanup           = lmv_precleanup,
2847         .o_process_config       = lmv_process_config,
2848         .o_connect              = lmv_connect,
2849         .o_disconnect           = lmv_disconnect,
2850         .o_statfs               = lmv_statfs,
2851         .o_llog_init            = lmv_llog_init,
2852         .o_llog_finish          = lmv_llog_finish,
2853         .o_get_info             = lmv_get_info,
2854         .o_set_info_async       = lmv_set_info_async,
2855         .o_packmd               = lmv_packmd,
2856         .o_unpackmd             = lmv_unpackmd,
2857         .o_notify               = lmv_notify,
2858         .o_iocontrol            = lmv_iocontrol,
2859         .o_fid_delete           = lmv_fid_delete
2860 };
2861
2862 struct md_ops lmv_md_ops = {
2863         .m_getstatus            = lmv_getstatus,
2864         .m_change_cbdata        = lmv_change_cbdata,
2865         .m_close                = lmv_close,
2866         .m_create               = lmv_create,
2867         .m_done_writing         = lmv_done_writing,
2868         .m_enqueue              = lmv_enqueue,
2869         .m_getattr              = lmv_getattr,
2870         .m_getxattr             = lmv_getxattr,
2871         .m_getattr_name         = lmv_getattr_name,
2872         .m_intent_lock          = lmv_intent_lock,
2873         .m_link                 = lmv_link,
2874         .m_rename               = lmv_rename,
2875         .m_setattr              = lmv_setattr,
2876         .m_setxattr             = lmv_setxattr,
2877         .m_sync                 = lmv_sync,
2878         .m_readpage             = lmv_readpage,
2879         .m_unlink               = lmv_unlink,
2880         .m_init_ea_size         = lmv_init_ea_size,
2881         .m_cancel_unused        = lmv_cancel_unused,
2882         .m_set_lock_data        = lmv_set_lock_data,
2883         .m_lock_match           = lmv_lock_match,
2884         .m_get_lustre_md        = lmv_get_lustre_md,
2885         .m_free_lustre_md       = lmv_free_lustre_md,
2886         .m_set_open_replay_data = lmv_set_open_replay_data,
2887         .m_clear_open_replay_data = lmv_clear_open_replay_data,
2888         .m_get_remote_perm      = lmv_get_remote_perm,
2889         .m_renew_capa           = lmv_renew_capa
2890 };
2891
2892 int __init lmv_init(void)
2893 {
2894         struct lprocfs_static_vars lvars;
2895         int rc;
2896
2897         obj_cache = cfs_mem_cache_create("lmv_objects",
2898                                       sizeof(struct lmv_obj),
2899                                       0, 0);
2900         if (!obj_cache) {
2901                 CERROR("error allocating lmv objects cache\n");
2902                 return -ENOMEM;
2903         }
2904
2905         lprocfs_init_vars(lmv, &lvars);
2906         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
2907                                  lvars.module_vars, LUSTRE_LMV_NAME, NULL);
2908         if (rc)
2909                 cfs_mem_cache_destroy(obj_cache);
2910
2911         return rc;
2912 }
2913
2914 #ifdef __KERNEL__
2915 static void lmv_exit(void)
2916 {
2917         int rc;
2918
2919         class_unregister_type(LUSTRE_LMV_NAME);
2920
2921         rc = cfs_mem_cache_destroy(obj_cache);
2922         LASSERTF(rc == 0,
2923                  "can't free lmv objects cache, %d object(s)"
2924                  "still in use\n", atomic_read(&obj_cache_count));
2925 }
2926
2927 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2928 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
2929 MODULE_LICENSE("GPL");
2930
2931 module_init(lmv_init);
2932 module_exit(lmv_exit);
2933 #endif