lustre/lov/lov_obd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lov/lov_obd.c
  37  *
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  * Author: Peter Braam <braam@clusterfs.com>
  40  * Author: Mike Shaver <shaver@clusterfs.com>
  41  * Author: Nathan Rutman <nathan@clusterfs.com>
  42  */
  43
  44 #ifndef EXPORT_SYMTAB
  45 # define EXPORT_SYMTAB
  46 #endif
  47 #define DEBUG_SUBSYSTEM S_LOV
  48 #ifdef __KERNEL__
  49 #include <libcfs/libcfs.h>
  50 #else
  51 #include <liblustre.h>
  52 #endif
  53
  54 #include <obd_support.h>
  55 #include <lustre_lib.h>
  56 #include <lustre_net.h>
  57 #include <lustre/lustre_idl.h>
  58 #include <lustre_dlm.h>
  59 #include <lustre_mds.h>
  60 #include <lustre_debug.h>
  61 #include <obd_class.h>
  62 #include <obd_lov.h>
  63 #include <obd_ost.h>
  64 #include <lprocfs_status.h>
  65 #include <lustre_param.h>
  66 #include <cl_object.h>
  67 #include <lustre/ll_fiemap.h>
  68
  69 #include "lov_internal.h"
  70
  71 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  72    Any function that expects lov_tgts to remain stationary must take a ref. */
  73 static void lov_getref(struct obd_device *obd)
  74 {
  75         struct lov_obd *lov = &obd->u.lov;
  76
  77         /* nobody gets through here until lov_putref is done */
  78         mutex_down(&lov->lov_lock);
  79         atomic_inc(&lov->lov_refcount);
  80         mutex_up(&lov->lov_lock);
  81         return;
  82 }
  83
  84 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  85
  86 static void lov_putref(struct obd_device *obd)
  87 {
  88         struct lov_obd *lov = &obd->u.lov;
  89
  90         mutex_down(&lov->lov_lock);
  91         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  92         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  93                 CFS_LIST_HEAD(kill);
  94                 int i;
  95                 struct lov_tgt_desc *tgt, *n;
  96                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  97                        lov->lov_death_row);
  98                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  99                         tgt = lov->lov_tgts[i];
 100
 101                         if (!tgt || !tgt->ltd_reap)
 102                                 continue;
 103                         list_add(&tgt->ltd_kill, &kill);
 104                         /* XXX - right now there is a dependency on ld_tgt_count
 105                          * being the maximum tgt index for computing the
 106                          * mds_max_easize. So we can't shrink it. */
 107                         lov_ost_pool_remove(&lov->lov_packed, i);
 108                         lov->lov_tgts[i] = NULL;
 109                         lov->lov_death_row--;
 110                 }
 111                 mutex_up(&lov->lov_lock);
 112
 113                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 114                         list_del(&tgt->ltd_kill);
 115                         /* Disconnect */
 116                         __lov_del_obd(obd, tgt);
 117                 }
 118         } else {
 119                 mutex_up(&lov->lov_lock);
 120         }
 121 }
 122
 123 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 124                               int activate);
 125 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 126                       enum obd_notify_event ev, void *data);
 127
 128
 129 #define MAX_STRING_SIZE 128
 130 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 131                     struct obd_connect_data *data)
 132 {
 133         struct lov_obd *lov = &obd->u.lov;
 134         struct obd_uuid tgt_uuid;
 135         struct obd_device *tgt_obd;
 136         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 137         struct obd_import *imp;
 138
 139 #ifdef __KERNEL__
 140         cfs_proc_dir_entry_t *lov_proc_dir;
 141 #endif
 142         int rc;
 143         ENTRY;
 144
 145         if (!lov->lov_tgts[index])
 146                 RETURN(-EINVAL);
 147
 148         tgt_uuid = lov->lov_tgts[index]->ltd_uuid;
 149         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 150
 151         if (!tgt_obd->obd_set_up) {
 152                 CERROR("Target %s not set up\n", obd_uuid2str(&tgt_uuid));
 153                 RETURN(-EINVAL);
 154         }
 155
 156         /* override the sp_me from lov */
 157         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 158
 159         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 160                 data->ocd_index = index;
 161
 162         /*
 163          * Divine LOV knows that OBDs under it are OSCs.
 164          */
 165         imp = tgt_obd->u.cli.cl_import;
 166
 167         if (activate) {
 168                 tgt_obd->obd_no_recov = 0;
 169                 /* FIXME this is probably supposed to be
 170                    ptlrpc_set_import_active.  Horrible naming. */
 171                 ptlrpc_activate_import(imp);
 172         }
 173
 174         rc = obd_register_observer(tgt_obd, obd);
 175         if (rc) {
 176                 CERROR("Target %s register_observer error %d\n",
 177                        obd_uuid2str(&tgt_uuid), rc);
 178                 RETURN(rc);
 179         }
 180
 181
 182         if (imp->imp_invalid) {
 183                 CERROR("not connecting OSC %s; administratively "
 184                        "disabled\n", obd_uuid2str(&tgt_uuid));
 185                 RETURN(0);
 186         }
 187
 188         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 189                          &lov_osc_uuid, data, NULL);
 190         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 191                 CERROR("Target %s connect error %d\n",
 192                        obd_uuid2str(&tgt_uuid), rc);
 193                 RETURN(-ENODEV);
 194         }
 195
 196         lov->lov_tgts[index]->ltd_reap = 0;
 197
 198         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 199                obd_uuid2str(&tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 200
 201 #ifdef __KERNEL__
 202         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 203         if (lov_proc_dir) {
 204                 struct obd_device *osc_obd = lov->lov_tgts[index]->ltd_exp->exp_obd;
 205                 cfs_proc_dir_entry_t *osc_symlink;
 206                 char name[MAX_STRING_SIZE];
 207
 208                 LASSERT(osc_obd != NULL);
 209                 LASSERT(osc_obd->obd_magic == OBD_DEVICE_MAGIC);
 210                 LASSERT(osc_obd->obd_type->typ_name != NULL);
 211                 snprintf(name, MAX_STRING_SIZE, "../../../%s/%s",
 212                          osc_obd->obd_type->typ_name,
 213                          osc_obd->obd_name);
 214                 osc_symlink = lprocfs_add_symlink(osc_obd->obd_name, lov_proc_dir,
 215                                                   name);
 216                 if (osc_symlink == NULL) {
 217                         CERROR("could not register LOV target "
 218                                "/proc/fs/lustre/%s/%s/target_obds/%s.",
 219                                obd->obd_type->typ_name, obd->obd_name,
 220                                osc_obd->obd_name);
 221                         lprocfs_remove(&lov_proc_dir);
 222                 }
 223         }
 224 #endif
 225
 226         rc = qos_add_tgt(obd, index);
 227         if (rc)
 228                 CERROR("qos_add_tgt failed %d\n", rc);
 229
 230         RETURN(0);
 231 }
 232
 233 static int lov_connect(const struct lu_env *env,
 234                        struct obd_export **exp, struct obd_device *obd,
 235                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 236                        void *localdata)
 237 {
 238         struct lov_obd *lov = &obd->u.lov;
 239         struct lov_tgt_desc *tgt;
 240         struct lustre_handle conn;
 241         int i, rc;
 242         ENTRY;
 243
 244         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 245
 246         rc = class_connect(&conn, obd, cluuid);
 247         if (rc)
 248                 RETURN(rc);
 249
 250         *exp = class_conn2export(&conn);
 251
 252         /* Why should there ever be more than 1 connect? */
 253         lov->lov_connects++;
 254         LASSERT(lov->lov_connects == 1);
 255
 256         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 257         if (data)
 258                 lov->lov_ocd = *data;
 259
 260         obd_getref(obd);
 261         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 262                 tgt = lov->lov_tgts[i];
 263                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 264                         continue;
 265                 /* Flags will be lowest common denominator */
 266                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 267                 if (rc) {
 268                         CERROR("%s: lov connect tgt %d failed: %d\n",
 269                                obd->obd_name, i, rc);
 270                         continue;
 271                 }
 272                 /* connect to administrative disabled ost */
 273                 if (!lov->lov_tgts[i]->ltd_exp)
 274                         continue;
 275
 276                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 277                                 OBD_NOTIFY_CONNECT, (void *)&i);
 278                 if (rc) {
 279                         CERROR("%s error sending notify %d\n",
 280                                obd->obd_name, rc);
 281                 }
 282         }
 283         obd_putref(obd);
 284
 285         RETURN(0);
 286 }
 287
 288 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 289 {
 290         cfs_proc_dir_entry_t *lov_proc_dir;
 291         struct lov_obd *lov = &obd->u.lov;
 292         struct obd_device *osc_obd;
 293         int rc;
 294         ENTRY;
 295
 296         osc_obd = class_exp2obd(tgt->ltd_exp);
 297         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 298                obd->obd_name, osc_obd->obd_name);
 299
 300         if (tgt->ltd_active) {
 301                 tgt->ltd_active = 0;
 302                 lov->desc.ld_active_tgt_count--;
 303                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 304         }
 305
 306         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 307         if (lov_proc_dir) {
 308                 cfs_proc_dir_entry_t *osc_symlink;
 309
 310                 osc_symlink = lprocfs_srch(lov_proc_dir, osc_obd->obd_name);
 311                 if (osc_symlink) {
 312                         lprocfs_remove(&osc_symlink);
 313                 } else {
 314                         CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing.",
 315                                obd->obd_type->typ_name, obd->obd_name,
 316                                osc_obd->obd_name);
 317                 }
 318         }
 319
 320         if (osc_obd) {
 321                 /* Pass it on to our clients.
 322                  * XXX This should be an argument to disconnect,
 323                  * XXX not a back-door flag on the OBD.  Ah well.
 324                  */
 325                 osc_obd->obd_force = obd->obd_force;
 326                 osc_obd->obd_fail = obd->obd_fail;
 327                 osc_obd->obd_no_recov = obd->obd_no_recov;
 328         }
 329
 330         obd_register_observer(osc_obd, NULL);
 331
 332         rc = obd_disconnect(tgt->ltd_exp);
 333         if (rc) {
 334                 CERROR("Target %s disconnect error %d\n",
 335                        tgt->ltd_uuid.uuid, rc);
 336                 rc = 0;
 337         }
 338
 339         qos_del_tgt(obd, tgt);
 340
 341         tgt->ltd_exp = NULL;
 342         RETURN(0);
 343 }
 344
 345 static int lov_disconnect(struct obd_export *exp)
 346 {
 347         struct obd_device *obd = class_exp2obd(exp);
 348         struct lov_obd *lov = &obd->u.lov;
 349         int i, rc;
 350         ENTRY;
 351
 352         if (!lov->lov_tgts)
 353                 goto out;
 354
 355         /* Only disconnect the underlying layers on the final disconnect. */
 356         lov->lov_connects--;
 357         if (lov->lov_connects != 0) {
 358                 /* why should there be more than 1 connect? */
 359                 CERROR("disconnect #%d\n", lov->lov_connects);
 360                 goto out;
 361         }
 362
 363         /* Let's hold another reference so lov_del_obd doesn't spin through
 364            putref every time */
 365         obd_getref(obd);
 366
 367         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 368                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 369                         /* Disconnection is the last we know about an obd */
 370                         lov_del_target(obd, i, 0, lov->lov_tgts[i]->ltd_gen);
 371                 }
 372         }
 373         obd_putref(obd);
 374
 375 out:
 376         rc = class_disconnect(exp); /* bz 9811 */
 377         RETURN(rc);
 378 }
 379
 380 /* Error codes:
 381  *
 382  *  -EINVAL  : UUID can't be found in the LOV's target list
 383  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 384  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 385  *  any >= 0 : is log target index
 386  */
 387 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 388                               int activate)
 389 {
 390         struct lov_obd *lov = &obd->u.lov;
 391         struct lov_tgt_desc *tgt;
 392         int index;
 393         ENTRY;
 394
 395         CDEBUG(D_INFO, "Searching in lov %p for uuid %s (activate=%d)\n",
 396                lov, uuid->uuid, activate);
 397
 398         obd_getref(obd);
 399         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 400                 tgt = lov->lov_tgts[index];
 401                 if (!tgt || !tgt->ltd_exp)
 402                         continue;
 403
 404                 CDEBUG(D_INFO, "lov idx %d is %s conn "LPX64"\n",
 405                        index, obd_uuid2str(&tgt->ltd_uuid),
 406                        tgt->ltd_exp->exp_handle.h_cookie);
 407                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 408                         break;
 409         }
 410
 411         if (index == lov->desc.ld_tgt_count)
 412                 GOTO(out, index = -EINVAL);
 413
 414         if (lov->lov_tgts[index]->ltd_active == activate) {
 415                 CDEBUG(D_INFO, "OSC %s already %sactive!\n", uuid->uuid,
 416                        activate ? "" : "in");
 417                 GOTO(out, index);
 418         }
 419
 420         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n", obd_uuid2str(uuid),
 421                activate ? "" : "in");
 422
 423         lov->lov_tgts[index]->ltd_active = activate;
 424
 425         if (activate) {
 426                 lov->desc.ld_active_tgt_count++;
 427                 lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 428         } else {
 429                 lov->desc.ld_active_tgt_count--;
 430                 lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 431         }
 432         /* remove any old qos penalty */
 433         lov->lov_tgts[index]->ltd_qos.ltq_penalty = 0;
 434
 435  out:
 436         obd_putref(obd);
 437         RETURN(index);
 438 }
 439
 440 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 441                       enum obd_notify_event ev, void *data)
 442 {
 443         int rc = 0;
 444         ENTRY;
 445
 446         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 447                 struct obd_uuid *uuid;
 448
 449                 LASSERT(watched);
 450
 451                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 452                         CERROR("unexpected notification of %s %s!\n",
 453                                watched->obd_type->typ_name,
 454                                watched->obd_name);
 455                         RETURN(-EINVAL);
 456                 }
 457                 uuid = &watched->u.cli.cl_target_uuid;
 458
 459                 /* Set OSC as active before notifying the observer, so the
 460                  * observer can use the OSC normally.
 461                  */
 462                 rc = lov_set_osc_active(obd, uuid, ev == OBD_NOTIFY_ACTIVE);
 463                 if (rc < 0) {
 464                         CERROR("%sactivation of %s failed: %d\n",
 465                                (ev == OBD_NOTIFY_ACTIVE) ? "" : "de",
 466                                obd_uuid2str(uuid), rc);
 467                         RETURN(rc);
 468                 }
 469                 /* active event should be pass lov target index as data */
 470                 data = &rc;
 471         }
 472
 473         /* Pass the notification up the chain. */
 474         if (watched) {
 475                 rc = obd_notify_observer(obd, watched, ev, data);
 476         } else {
 477                 /* NULL watched means all osc's in the lov (only for syncs) */
 478                 /* sync event should be send lov idx as data */
 479                 struct lov_obd *lov = &obd->u.lov;
 480                 struct obd_device *tgt_obd;
 481                 int i;
 482                 obd_getref(obd);
 483                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 484                         /* don't send sync event if target not
 485                          * connected/activated */
 486                         if (!lov->lov_tgts[i] ||
 487                             !lov->lov_tgts[i]->ltd_active)
 488                                  continue;
 489
 490                         if ((ev == OBD_NOTIFY_SYNC) ||
 491                             (ev == OBD_NOTIFY_SYNC_NONBLOCK))
 492                                 data = &i;
 493
 494                         tgt_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
 495
 496                         rc = obd_notify_observer(obd, tgt_obd, ev, data);
 497                         if (rc) {
 498                                 CERROR("%s: notify %s of %s failed %d\n",
 499                                        obd->obd_name,
 500                                        obd->obd_observer->obd_name,
 501                                        tgt_obd->obd_name, rc);
 502                                 break;
 503                         }
 504                 }
 505                 obd_putref(obd);
 506         }
 507
 508         RETURN(rc);
 509 }
 510
 511 int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 512                    __u32 index, int gen, int active)
 513 {
 514         struct lov_obd *lov = &obd->u.lov;
 515         struct lov_tgt_desc *tgt;
 516         struct obd_device *tgt_obd;
 517         int rc;
 518         ENTRY;
 519
 520         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 521                uuidp->uuid, index, gen, active);
 522
 523         if (gen <= 0) {
 524                 CERROR("request to add OBD %s with invalid generation: %d\n",
 525                        uuidp->uuid, gen);
 526                 RETURN(-EINVAL);
 527         }
 528
 529         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 530                                         &obd->obd_uuid);
 531         if (tgt_obd == NULL)
 532                 RETURN(-EINVAL);
 533
 534         mutex_down(&lov->lov_lock);
 535
 536         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 537                 tgt = lov->lov_tgts[index];
 538                 CERROR("UUID %s already assigned at LOV target index %d\n",
 539                        obd_uuid2str(&tgt->ltd_uuid), index);
 540                 mutex_up(&lov->lov_lock);
 541                 RETURN(-EEXIST);
 542         }
 543
 544         if (index >= lov->lov_tgt_size) {
 545                 /* We need to reallocate the lov target array. */
 546                 struct lov_tgt_desc **newtgts, **old = NULL;
 547                 __u32 newsize, oldsize = 0;
 548
 549                 newsize = max(lov->lov_tgt_size, (__u32)2);
 550                 while (newsize < index + 1)
 551                         newsize = newsize << 1;
 552                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 553                 if (newtgts == NULL) {
 554                         mutex_up(&lov->lov_lock);
 555                         RETURN(-ENOMEM);
 556                 }
 557
 558                 if (lov->lov_tgt_size) {
 559                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 560                                lov->lov_tgt_size);
 561                         old = lov->lov_tgts;
 562                         oldsize = lov->lov_tgt_size;
 563                 }
 564
 565                 lov->lov_tgts = newtgts;
 566                 lov->lov_tgt_size = newsize;
 567 #ifdef __KERNEL__
 568                 smp_rmb();
 569 #endif
 570                 if (old)
 571                         OBD_FREE(old, sizeof(*old) * oldsize);
 572
 573                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 574                        lov->lov_tgts, lov->lov_tgt_size);
 575         }
 576
 577         OBD_ALLOC_PTR(tgt);
 578         if (!tgt) {
 579                 mutex_up(&lov->lov_lock);
 580                 RETURN(-ENOMEM);
 581         }
 582
 583         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 584         if (rc) {
 585                 mutex_up(&lov->lov_lock);
 586                 OBD_FREE_PTR(tgt);
 587                 RETURN(rc);
 588         }
 589
 590         memset(tgt, 0, sizeof(*tgt));
 591         tgt->ltd_uuid = *uuidp;
 592         tgt->ltd_obd = tgt_obd;
 593         /* XXX - add a sanity check on the generation number. */
 594         tgt->ltd_gen = gen;
 595         tgt->ltd_index = index;
 596         tgt->ltd_activate = active;
 597         lov->lov_tgts[index] = tgt;
 598         if (index >= lov->desc.ld_tgt_count)
 599                 lov->desc.ld_tgt_count = index + 1;
 600
 601         mutex_up(&lov->lov_lock);
 602
 603         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 604                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 605
 606         if (lov->lov_connects == 0) {
 607                 /* lov_connect hasn't been called yet. We'll do the
 608                    lov_connect_obd on this target when that fn first runs,
 609                    because we don't know the connect flags yet. */
 610                 RETURN(0);
 611         }
 612
 613         obd_getref(obd);
 614
 615         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 616         if (rc)
 617                 GOTO(out, rc);
 618
 619         /* connect to administrative disabled ost */
 620         if (!tgt->ltd_exp)
 621                 GOTO(out, rc = 0);
 622
 623         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 624                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 625                         (void *)&index);
 626
 627 out:
 628         if (rc) {
 629                 CERROR("add failed (%d), deleting %s\n", rc,
 630                        obd_uuid2str(&tgt->ltd_uuid));
 631                 lov_del_target(obd, index, 0, 0);
 632         }
 633         obd_putref(obd);
 634         RETURN(rc);
 635 }
 636
 637 /* Schedule a target for deletion */
 638 int lov_del_target(struct obd_device *obd, __u32 index,
 639                    struct obd_uuid *uuidp, int gen)
 640 {
 641         struct lov_obd *lov = &obd->u.lov;
 642         int count = lov->desc.ld_tgt_count;
 643         int rc = 0;
 644         ENTRY;
 645
 646         if (index >= count) {
 647                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 648                        index, count);
 649                 RETURN(-EINVAL);
 650         }
 651
 652         obd_getref(obd);
 653
 654         if (!lov->lov_tgts[index]) {
 655                 CERROR("LOV target at index %d is not setup.\n", index);
 656                 GOTO(out, rc = -EINVAL);
 657         }
 658
 659         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 660                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 661                        lov_uuid2str(lov, index), index,
 662                        obd_uuid2str(uuidp));
 663                 GOTO(out, rc = -EINVAL);
 664         }
 665
 666         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 667                lov_uuid2str(lov, index), index,
 668                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 669                lov->lov_tgts[index]->ltd_active);
 670
 671         lov->lov_tgts[index]->ltd_reap = 1;
 672         lov->lov_death_row++;
 673         /* we really delete it from obd_putref */
 674 out:
 675         obd_putref(obd);
 676
 677         RETURN(rc);
 678 }
 679
 680 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 681 {
 682         struct obd_device *osc_obd;
 683
 684         LASSERT(tgt);
 685         LASSERT(tgt->ltd_reap);
 686
 687         osc_obd = class_exp2obd(tgt->ltd_exp);
 688
 689         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 690                tgt->ltd_uuid.uuid,
 691                osc_obd ? osc_obd->obd_name : "<no obd>");
 692
 693         if (tgt->ltd_exp)
 694                 lov_disconnect_obd(obd, tgt);
 695
 696         OBD_FREE_PTR(tgt);
 697
 698         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 699            do it ourselves. And we can't do it from lov_cleanup,
 700            because we just lost our only reference to it. */
 701         if (osc_obd)
 702                 class_manual_cleanup(osc_obd);
 703 }
 704
 705 void lov_fix_desc_stripe_size(__u64 *val)
 706 {
 707         if (*val < PTLRPC_MAX_BRW_SIZE) {
 708                 LCONSOLE_WARN("Increasing default stripe size to min %u\n",
 709                               PTLRPC_MAX_BRW_SIZE);
 710                 *val = PTLRPC_MAX_BRW_SIZE;
 711         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 712                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 713                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
 714                               "multiple of %u)\n",
 715                               *val, LOV_MIN_STRIPE_SIZE);
 716         }
 717 }
 718
 719 void lov_fix_desc_stripe_count(__u32 *val)
 720 {
 721         if (*val == 0)
 722                 *val = 1;
 723 }
 724
 725 void lov_fix_desc_pattern(__u32 *val)
 726 {
 727         /* from lov_setstripe */
 728         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 729                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 730                 *val = 0;
 731         }
 732 }
 733
 734 void lov_fix_desc_qos_maxage(__u32 *val)
 735 {
 736         /* fix qos_maxage */
 737         if (*val == 0)
 738                 *val = QOS_DEFAULT_MAXAGE;
 739 }
 740
 741 void lov_fix_desc(struct lov_desc *desc)
 742 {
 743         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 744         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 745         lov_fix_desc_pattern(&desc->ld_pattern);
 746         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 747 }
 748
 749 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 750 {
 751         struct lprocfs_static_vars lvars = { 0 };
 752         struct lov_desc *desc;
 753         struct lov_obd *lov = &obd->u.lov;
 754         int rc;
 755         ENTRY;
 756
 757         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 758                 CERROR("LOV setup requires a descriptor\n");
 759                 RETURN(-EINVAL);
 760         }
 761
 762         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 763
 764         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 765                 CERROR("descriptor size wrong: %d > %d\n",
 766                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 767                 RETURN(-EINVAL);
 768         }
 769
 770         if (desc->ld_magic != LOV_DESC_MAGIC) {
 771                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 772                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 773                                    obd->obd_name, desc);
 774                             lustre_swab_lov_desc(desc);
 775                 } else {
 776                         CERROR("%s: Bad lov desc magic: %#x\n",
 777                                obd->obd_name, desc->ld_magic);
 778                         RETURN(-EINVAL);
 779                 }
 780         }
 781
 782         lov_fix_desc(desc);
 783
 784         desc->ld_active_tgt_count = 0;
 785         lov->desc = *desc;
 786         lov->lov_tgt_size = 0;
 787
 788         sema_init(&lov->lov_lock, 1);
 789         atomic_set(&lov->lov_refcount, 0);
 790         CFS_INIT_LIST_HEAD(&lov->lov_qos.lq_oss_list);
 791         init_rwsem(&lov->lov_qos.lq_rw_sem);
 792         lov->lov_sp_me = LUSTRE_SP_CLI;
 793         lov->lov_qos.lq_dirty = 1;
 794         lov->lov_qos.lq_rr.lqr_dirty = 1;
 795         lov->lov_qos.lq_reset = 1;
 796         /* Default priority is toward free space balance */
 797         lov->lov_qos.lq_prio_free = 232;
 798         /* Default threshold for rr (roughly 17%) */
 799         lov->lov_qos.lq_threshold_rr = 43;
 800         /* Init statfs fields */
 801         OBD_ALLOC_PTR(lov->lov_qos.lq_statfs_data);
 802         if (NULL == lov->lov_qos.lq_statfs_data)
 803                 RETURN(-ENOMEM);
 804         cfs_waitq_init(&lov->lov_qos.lq_statfs_waitq);
 805
 806         lov->lov_pools_hash_body = lustre_hash_init("POOLS",
 807                                                     HASH_POOLS_CUR_BITS,
 808                                                     HASH_POOLS_MAX_BITS,
 809                                                     &pool_hash_operations, 0);
 810         CFS_INIT_LIST_HEAD(&lov->lov_pool_list);
 811         lov->lov_pool_count = 0;
 812         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 813         if (rc)
 814                 RETURN(rc);
 815         rc = lov_ost_pool_init(&lov->lov_qos.lq_rr.lqr_pool, 0);
 816         if (rc) {
 817                 lov_ost_pool_free(&lov->lov_packed);
 818                 RETURN(rc);
 819         }
 820
 821         lprocfs_lov_init_vars(&lvars);
 822         lprocfs_obd_setup(obd, lvars.obd_vars);
 823 #ifdef LPROCFS
 824         {
 825                 int rc;
 826
 827                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
 828                                         0444, &lov_proc_target_fops, obd);
 829                 if (rc)
 830                         CWARN("Error adding the target_obd file\n");
 831         }
 832 #endif
 833         lov->lov_pool_proc_entry = lprocfs_register("pools",
 834                                                     obd->obd_proc_entry,
 835                                                     NULL, NULL);
 836
 837         RETURN(0);
 838 }
 839
 840 static int lov_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 841 {
 842         int rc = 0;
 843         struct lov_obd *lov = &obd->u.lov;
 844
 845         ENTRY;
 846
 847         switch (stage) {
 848         case OBD_CLEANUP_EARLY: {
 849                 int i;
 850                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 851                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_active)
 852                                 continue;
 853                         obd_precleanup(class_exp2obd(lov->lov_tgts[i]->ltd_exp),
 854                                        OBD_CLEANUP_EARLY);
 855                 }
 856                 break;
 857         }
 858         case OBD_CLEANUP_EXPORTS:
 859                 rc = obd_llog_finish(obd, 0);
 860                 if (rc != 0)
 861                         CERROR("failed to cleanup llogging subsystems\n");
 862                 break;
 863         }
 864         RETURN(rc);
 865 }
 866
 867 static int lov_cleanup(struct obd_device *obd)
 868 {
 869         struct lov_obd *lov = &obd->u.lov;
 870         struct list_head *pos, *tmp;
 871         struct pool_desc *pool;
 872
 873         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 874                 pool = list_entry(pos, struct pool_desc, pool_list);
 875                 /* free pool structs */
 876                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 877                 lov_pool_del(obd, pool->pool_name);
 878         }
 879         lustre_hash_exit(lov->lov_pools_hash_body);
 880         lov_ost_pool_free(&(lov->lov_qos.lq_rr.lqr_pool));
 881         lov_ost_pool_free(&lov->lov_packed);
 882
 883         if (lov->lov_tgts) {
 884                 int i;
 885                 obd_getref(obd);
 886                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 887                         if (!lov->lov_tgts[i])
 888                                 continue;
 889
 890                         /* Inactive targets may never have connected */
 891                         if (lov->lov_tgts[i]->ltd_active ||
 892                             atomic_read(&lov->lov_refcount))
 893                             /* We should never get here - these
 894                                should have been removed in the
 895                              disconnect. */
 896                                 CERROR("lov tgt %d not cleaned!"
 897                                        " deathrow=%d, lovrc=%d\n",
 898                                        i, lov->lov_death_row,
 899                                        atomic_read(&lov->lov_refcount));
 900                         lov_del_target(obd, i, 0, 0);
 901                 }
 902                 obd_putref(obd);
 903                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 904                          lov->lov_tgt_size);
 905                 lov->lov_tgt_size = 0;
 906         }
 907
 908         /* clear pools parent proc entry only after all pools is killed */
 909         lprocfs_obd_cleanup(obd);
 910
 911         OBD_FREE_PTR(lov->lov_qos.lq_statfs_data);
 912         RETURN(0);
 913 }
 914
 915 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 916                             __u32 *indexp, int *genp)
 917 {
 918         struct obd_uuid obd_uuid;
 919         int cmd;
 920         int rc = 0;
 921         ENTRY;
 922
 923         switch(cmd = lcfg->lcfg_command) {
 924         case LCFG_LOV_ADD_OBD:
 925         case LCFG_LOV_ADD_INA:
 926         case LCFG_LOV_DEL_OBD: {
 927                 __u32 index;
 928                 int gen;
 929                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 930                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
 931                         GOTO(out, rc = -EINVAL);
 932
 933                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 934
 935                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", indexp) != 1)
 936                         GOTO(out, rc = -EINVAL);
 937                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1)
 938                         GOTO(out, rc = -EINVAL);
 939                 index = *indexp;
 940                 gen = *genp;
 941                 if (cmd == LCFG_LOV_ADD_OBD)
 942                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 943                 else if (cmd == LCFG_LOV_ADD_INA)
 944                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 945                 else
 946                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 947                 GOTO(out, rc);
 948         }
 949         case LCFG_PARAM: {
 950                 struct lprocfs_static_vars lvars = { 0 };
 951                 struct lov_desc *desc = &(obd->u.lov.desc);
 952
 953                 if (!desc)
 954                         GOTO(out, rc = -EINVAL);
 955
 956                 lprocfs_lov_init_vars(&lvars);
 957
 958                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 959                                               lcfg, obd);
 960                 if (rc > 0)
 961                         rc = 0;
 962                 GOTO(out, rc);
 963         }
 964         case LCFG_POOL_NEW:
 965         case LCFG_POOL_ADD:
 966         case LCFG_POOL_DEL:
 967         case LCFG_POOL_REM:
 968                 GOTO(out, rc);
 969
 970         default: {
 971                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 972                 GOTO(out, rc = -EINVAL);
 973
 974         }
 975         }
 976 out:
 977         RETURN(rc);
 978 }
 979
 980 #ifndef log2
 981 #define log2(n) ffz(~(n))
 982 #endif
 983
 984 static int lov_clear_orphans(struct obd_export *export, struct obdo *src_oa,
 985                              struct lov_stripe_md **ea,
 986                              struct obd_trans_info *oti)
 987 {
 988         struct lov_obd *lov;
 989         struct obdo *tmp_oa;
 990         struct obd_uuid *ost_uuid = NULL;
 991         int rc = 0, i;
 992         ENTRY;
 993
 994         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 995                 src_oa->o_flags == OBD_FL_DELORPHAN);
 996
 997         lov = &export->exp_obd->u.lov;
 998
 999         OBDO_ALLOC(tmp_oa);
1000         if (tmp_oa == NULL)
1001                 RETURN(-ENOMEM);
1002
1003         if (oti->oti_ost_uuid) {
1004                 ost_uuid = oti->oti_ost_uuid;
1005                 CDEBUG(D_HA, "clearing orphans only for %s\n",
1006                        ost_uuid->uuid);
1007         }
1008
1009         obd_getref(export->exp_obd);
1010         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1011                 struct lov_stripe_md obj_md;
1012                 struct lov_stripe_md *obj_mdp = &obj_md;
1013                 struct lov_tgt_desc *tgt;
1014                 int err;
1015
1016                 tgt = lov->lov_tgts[i];
1017                 if (!tgt)
1018                         continue;
1019
1020                 /* if called for a specific target, we don't
1021                    care if it is not active. */
1022                 if (!lov->lov_tgts[i]->ltd_active && ost_uuid == NULL) {
1023                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
1024                         continue;
1025                 }
1026
1027                 if (ost_uuid && !obd_uuid_equals(ost_uuid, &tgt->ltd_uuid))
1028                         continue;
1029
1030                 CDEBUG(D_CONFIG,"Clear orphans for %d:%s\n", i,
1031                        obd_uuid2str(ost_uuid));
1032
1033                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
1034
1035                 LASSERT(lov->lov_tgts[i]->ltd_exp);
1036                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
1037                 err = obd_create(lov->lov_tgts[i]->ltd_exp,
1038                                  tmp_oa, &obj_mdp, oti);
1039                 if (err) {
1040                         /* This export will be disabled until it is recovered,
1041                            and then orphan recovery will be completed. */
1042                         CERROR("error in orphan recovery on OST idx %d/%d: "
1043                                "rc = %d\n", i, lov->desc.ld_tgt_count, err);
1044                         rc = err;
1045                 }
1046
1047                 if (ost_uuid)
1048                         break;
1049         }
1050         obd_putref(export->exp_obd);
1051
1052         OBDO_FREE(tmp_oa);
1053         RETURN(rc);
1054 }
1055
1056 static int lov_recreate(struct obd_export *exp, struct obdo *src_oa,
1057                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
1058 {
1059         struct lov_stripe_md *obj_mdp, *lsm;
1060         struct lov_obd *lov = &exp->exp_obd->u.lov;
1061         unsigned ost_idx;
1062         int rc, i;
1063         ENTRY;
1064
1065         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
1066                 src_oa->o_flags & OBD_FL_RECREATE_OBJS);
1067
1068         OBD_ALLOC(obj_mdp, sizeof(*obj_mdp));
1069         if (obj_mdp == NULL)
1070                 RETURN(-ENOMEM);
1071
1072         ost_idx = src_oa->o_nlink;
1073         lsm = *ea;
1074         if (lsm == NULL)
1075                 GOTO(out, rc = -EINVAL);
1076         if (ost_idx >= lov->desc.ld_tgt_count ||
1077             !lov->lov_tgts[ost_idx])
1078                 GOTO(out, rc = -EINVAL);
1079
1080         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1081                 if (lsm->lsm_oinfo[i]->loi_ost_idx == ost_idx) {
1082                         if (lsm->lsm_oinfo[i]->loi_id != src_oa->o_id)
1083                                 GOTO(out, rc = -EINVAL);
1084                         break;
1085                 }
1086         }
1087         if (i == lsm->lsm_stripe_count)
1088                 GOTO(out, rc = -EINVAL);
1089
1090         rc = obd_create(lov->lov_tgts[ost_idx]->ltd_exp, src_oa, &obj_mdp, oti);
1091 out:
1092         OBD_FREE(obj_mdp, sizeof(*obj_mdp));
1093         RETURN(rc);
1094 }
1095
1096 /* the LOV expects oa->o_id to be set to the LOV object id */
1097 static int lov_create(struct obd_export *exp, struct obdo *src_oa,
1098                       struct lov_stripe_md **ea, struct obd_trans_info *oti)
1099 {
1100         struct lov_obd *lov;
1101         struct obd_info oinfo;
1102         struct lov_request_set *set = NULL;
1103         struct lov_request *req;
1104         int rc = 0;
1105         ENTRY;
1106
1107         LASSERT(ea != NULL);
1108         if (exp == NULL)
1109                 RETURN(-EINVAL);
1110
1111         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1112             src_oa->o_flags == OBD_FL_DELORPHAN) {
1113                 rc = lov_clear_orphans(exp, src_oa, ea, oti);
1114                 RETURN(rc);
1115         }
1116
1117         lov = &exp->exp_obd->u.lov;
1118         if (!lov->desc.ld_active_tgt_count)
1119                 RETURN(-EIO);
1120
1121         obd_getref(exp->exp_obd);
1122         /* Recreate a specific object id at the given OST index */
1123         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1124             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
1125                  rc = lov_recreate(exp, src_oa, ea, oti);
1126                  GOTO(out, rc);
1127         }
1128
1129         /* issue statfs rpcs if the osfs data is older than qos_maxage - 1s,
1130          * later in alloc_qos(), we will wait for those rpcs to complete if
1131          * the osfs age is older than 2 * qos_maxage */
1132         qos_statfs_update(exp->exp_obd,
1133                           cfs_time_shift_64(-lov->desc.ld_qos_maxage) + HZ, 0);
1134
1135         rc = lov_prep_create_set(exp, &oinfo, ea, src_oa, oti, &set);
1136         if (rc)
1137                 GOTO(out, rc);
1138
1139         list_for_each_entry(req, &set->set_list, rq_link) {
1140                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
1141                 rc = obd_create(lov->lov_tgts[req->rq_idx]->ltd_exp,
1142                                 req->rq_oi.oi_oa, &req->rq_oi.oi_md, oti);
1143                 lov_update_create_set(set, req, rc);
1144         }
1145         rc = lov_fini_create_set(set, ea);
1146 out:
1147         obd_putref(exp->exp_obd);
1148         RETURN(rc);
1149 }
1150
1151 #define ASSERT_LSM_MAGIC(lsmp)                                                  \
1152 do {                                                                            \
1153         LASSERT((lsmp) != NULL);                                                \
1154         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                          \
1155                  (lsmp)->lsm_magic == LOV_MAGIC_V3 ||                           \
1156                  (lsmp)->lsm_magic == LOV_MAGIC_JOIN), "%p->lsm_magic=%x\n",    \
1157                  (lsmp), (lsmp)->lsm_magic);                                    \
1158 } while (0)
1159
1160 static int lov_destroy(struct obd_export *exp, struct obdo *oa,
1161                        struct lov_stripe_md *lsm, struct obd_trans_info *oti,
1162                        struct obd_export *md_exp, void *capa)
1163 {
1164         struct lov_request_set *set;
1165         struct obd_info oinfo;
1166         struct lov_request *req;
1167         struct list_head *pos;
1168         struct lov_obd *lov;
1169         int rc = 0, err = 0;
1170         ENTRY;
1171
1172         ASSERT_LSM_MAGIC(lsm);
1173
1174         if (!exp || !exp->exp_obd)
1175                 RETURN(-ENODEV);
1176
1177         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1178                 LASSERT(oti);
1179                 LASSERT(oti->oti_logcookies);
1180         }
1181
1182         lov = &exp->exp_obd->u.lov;
1183         obd_getref(exp->exp_obd);
1184         rc = lov_prep_destroy_set(exp, &oinfo, oa, lsm, oti, &set);
1185         if (rc)
1186                 GOTO(out, rc);
1187
1188         list_for_each (pos, &set->set_list) {
1189                 req = list_entry(pos, struct lov_request, rq_link);
1190
1191                 if (oa->o_valid & OBD_MD_FLCOOKIE)
1192                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1193
1194                 err = obd_destroy(lov->lov_tgts[req->rq_idx]->ltd_exp,
1195                                   req->rq_oi.oi_oa, NULL, oti, NULL, capa);
1196                 err = lov_update_common_set(set, req, err);
1197                 if (err) {
1198                         CERROR("error: destroying objid "LPX64" subobj "
1199                                LPX64" on OST idx %d: rc = %d\n",
1200                                oa->o_id, req->rq_oi.oi_oa->o_id,
1201                                req->rq_idx, err);
1202                         if (!rc)
1203                                 rc = err;
1204                 }
1205         }
1206
1207         if (rc == 0) {
1208                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
1209                 rc = lsm_op_find(lsm->lsm_magic)->lsm_destroy(lsm, oa, md_exp);
1210         }
1211         err = lov_fini_destroy_set(set);
1212 out:
1213         obd_putref(exp->exp_obd);
1214         RETURN(rc ? rc : err);
1215 }
1216
1217 static int lov_getattr(struct obd_export *exp, struct obd_info *oinfo)
1218 {
1219         struct lov_request_set *set;
1220         struct lov_request *req;
1221         struct list_head *pos;
1222         struct lov_obd *lov;
1223         int err = 0, rc = 0;
1224         ENTRY;
1225
1226         LASSERT(oinfo);
1227         ASSERT_LSM_MAGIC(oinfo->oi_md);
1228
1229         if (!exp || !exp->exp_obd)
1230                 RETURN(-ENODEV);
1231
1232         lov = &exp->exp_obd->u.lov;
1233
1234         rc = lov_prep_getattr_set(exp, oinfo, &set);
1235         if (rc)
1236                 RETURN(rc);
1237
1238         list_for_each (pos, &set->set_list) {
1239                 req = list_entry(pos, struct lov_request, rq_link);
1240
1241                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1242                        "%u\n", oinfo->oi_oa->o_id, req->rq_stripe,
1243                        req->rq_oi.oi_oa->o_id, req->rq_idx);
1244
1245                 rc = obd_getattr(lov->lov_tgts[req->rq_idx]->ltd_exp,
1246                                  &req->rq_oi);
1247                 err = lov_update_common_set(set, req, rc);
1248                 if (err) {
1249                         CERROR("error: getattr objid "LPX64" subobj "
1250                                LPX64" on OST idx %d: rc = %d\n",
1251                                oinfo->oi_oa->o_id, req->rq_oi.oi_oa->o_id,
1252                                req->rq_idx, err);
1253                         break;
1254                 }
1255         }
1256
1257         rc = lov_fini_getattr_set(set);
1258         if (err)
1259                 rc = err;
1260         RETURN(rc);
1261 }
1262
1263 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset,
1264                                  void *data, int rc)
1265 {
1266         struct lov_request_set *lovset = (struct lov_request_set *)data;
1267         int err;
1268         ENTRY;
1269
1270         /* don't do attribute merge if this aysnc op failed */
1271         if (rc)
1272                 lovset->set_completes = 0;
1273         err = lov_fini_getattr_set(lovset);
1274         RETURN(rc ? rc : err);
1275 }
1276
1277 static int lov_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
1278                               struct ptlrpc_request_set *rqset)
1279 {
1280         struct lov_request_set *lovset;
1281         struct lov_obd *lov;
1282         struct list_head *pos;
1283         struct lov_request *req;
1284         int rc = 0, err;
1285         ENTRY;
1286
1287         LASSERT(oinfo);
1288         ASSERT_LSM_MAGIC(oinfo->oi_md);
1289
1290         if (!exp || !exp->exp_obd)
1291                 RETURN(-ENODEV);
1292
1293         lov = &exp->exp_obd->u.lov;
1294
1295         rc = lov_prep_getattr_set(exp, oinfo, &lovset);
1296         if (rc)
1297                 RETURN(rc);
1298
1299         CDEBUG(D_INFO, "objid "LPX64": %ux%u byte stripes\n",
1300                oinfo->oi_md->lsm_object_id, oinfo->oi_md->lsm_stripe_count,
1301                oinfo->oi_md->lsm_stripe_size);
1302
1303         list_for_each (pos, &lovset->set_list) {
1304                 req = list_entry(pos, struct lov_request, rq_link);
1305
1306                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1307                        "%u\n", oinfo->oi_oa->o_id, req->rq_stripe,
1308                        req->rq_oi.oi_oa->o_id, req->rq_idx);
1309                 rc = obd_getattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1310                                        &req->rq_oi, rqset);
1311                 if (rc) {
1312                         CERROR("error: getattr objid "LPX64" subobj "
1313                                LPX64" on OST idx %d: rc = %d\n",
1314                                oinfo->oi_oa->o_id, req->rq_oi.oi_oa->o_id,
1315                                req->rq_idx, rc);
1316                         GOTO(out, rc);
1317                 }
1318         }
1319
1320         if (!list_empty(&rqset->set_requests)) {
1321                 LASSERT(rc == 0);
1322                 LASSERT (rqset->set_interpret == NULL);
1323                 rqset->set_interpret = lov_getattr_interpret;
1324                 rqset->set_arg = (void *)lovset;
1325                 RETURN(rc);
1326         }
1327 out:
1328         if (rc)
1329                 lovset->set_completes = 0;
1330         err = lov_fini_getattr_set(lovset);
1331         RETURN(rc ? rc : err);
1332 }
1333
1334 static int lov_setattr(struct obd_export *exp, struct obd_info *oinfo,
1335                        struct obd_trans_info *oti)
1336 {
1337         struct lov_request_set *set;
1338         struct lov_obd *lov;
1339         struct list_head *pos;
1340         struct lov_request *req;
1341         int err = 0, rc = 0;
1342         ENTRY;
1343
1344         LASSERT(oinfo);
1345         ASSERT_LSM_MAGIC(oinfo->oi_md);
1346
1347         if (!exp || !exp->exp_obd)
1348                 RETURN(-ENODEV);
1349
1350         /* for now, we only expect the following updates here */
1351         LASSERT(!(oinfo->oi_oa->o_valid & ~(OBD_MD_FLID | OBD_MD_FLTYPE |
1352                                             OBD_MD_FLMODE | OBD_MD_FLATIME |
1353                                             OBD_MD_FLMTIME | OBD_MD_FLCTIME |
1354                                             OBD_MD_FLFLAGS | OBD_MD_FLSIZE |
1355                                             OBD_MD_FLGROUP | OBD_MD_FLUID |
1356                                             OBD_MD_FLGID | OBD_MD_FLFID |
1357                                             OBD_MD_FLGENER)));
1358         lov = &exp->exp_obd->u.lov;
1359         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1360         if (rc)
1361                 RETURN(rc);
1362
1363         list_for_each (pos, &set->set_list) {
1364                 req = list_entry(pos, struct lov_request, rq_link);
1365
1366                 rc = obd_setattr(lov->lov_tgts[req->rq_idx]->ltd_exp,
1367                                  &req->rq_oi, NULL);
1368                 err = lov_update_setattr_set(set, req, rc);
1369                 if (err) {
1370                         CERROR("error: setattr objid "LPX64" subobj "
1371                                LPX64" on OST idx %d: rc = %d\n",
1372                                set->set_oi->oi_oa->o_id,
1373                                req->rq_oi.oi_oa->o_id, req->rq_idx, err);
1374                         if (!rc)
1375                                 rc = err;
1376                 }
1377         }
1378         err = lov_fini_setattr_set(set);
1379         if (!rc)
1380                 rc = err;
1381         RETURN(rc);
1382 }
1383
1384 static int lov_setattr_interpret(struct ptlrpc_request_set *rqset,
1385                                  void *data, int rc)
1386 {
1387         struct lov_request_set *lovset = (struct lov_request_set *)data;
1388         int err;
1389         ENTRY;
1390
1391         if (rc)
1392                 lovset->set_completes = 0;
1393         err = lov_fini_setattr_set(lovset);
1394         RETURN(rc ? rc : err);
1395 }
1396
1397 /* If @oti is given, the request goes from MDS and responses from OSTs are not
1398    needed. Otherwise, a client is waiting for responses. */
1399 static int lov_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
1400                              struct obd_trans_info *oti,
1401                              struct ptlrpc_request_set *rqset)
1402 {
1403         struct lov_request_set *set;
1404         struct lov_request *req;
1405         struct list_head *pos;
1406         struct lov_obd *lov;
1407         int rc = 0;
1408         ENTRY;
1409
1410         LASSERT(oinfo);
1411         ASSERT_LSM_MAGIC(oinfo->oi_md);
1412         if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE) {
1413                 LASSERT(oti);
1414                 LASSERT(oti->oti_logcookies);
1415         }
1416
1417         if (!exp || !exp->exp_obd)
1418                 RETURN(-ENODEV);
1419
1420         lov = &exp->exp_obd->u.lov;
1421         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1422         if (rc)
1423                 RETURN(rc);
1424
1425         CDEBUG(D_INFO, "objid "LPX64": %ux%u byte stripes\n",
1426                oinfo->oi_md->lsm_object_id, oinfo->oi_md->lsm_stripe_count,
1427                oinfo->oi_md->lsm_stripe_size);
1428
1429         list_for_each (pos, &set->set_list) {
1430                 req = list_entry(pos, struct lov_request, rq_link);
1431
1432                 if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
1433                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1434
1435                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1436                        "%u\n", oinfo->oi_oa->o_id, req->rq_stripe,
1437                        req->rq_oi.oi_oa->o_id, req->rq_idx);
1438
1439                 rc = obd_setattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1440                                        &req->rq_oi, oti, rqset);
1441                 if (rc) {
1442                         CERROR("error: setattr objid "LPX64" subobj "
1443                                LPX64" on OST idx %d: rc = %d\n",
1444                                set->set_oi->oi_oa->o_id,
1445                                req->rq_oi.oi_oa->o_id,
1446                                req->rq_idx, rc);
1447                         break;
1448                 }
1449         }
1450
1451         /* If we are not waiting for responses on async requests, return. */
1452         if (rc || !rqset || list_empty(&rqset->set_requests)) {
1453                 int err;
1454                 if (rc)
1455                         set->set_completes = 0;
1456                 err = lov_fini_setattr_set(set);
1457                 RETURN(rc ? rc : err);
1458         }
1459
1460         LASSERT(rqset->set_interpret == NULL);
1461         rqset->set_interpret = lov_setattr_interpret;
1462         rqset->set_arg = (void *)set;
1463
1464         RETURN(0);
1465 }
1466
1467 static int lov_punch_interpret(struct ptlrpc_request_set *rqset,
1468                                void *data, int rc)
1469 {
1470         struct lov_request_set *lovset = (struct lov_request_set *)data;
1471         int err;
1472         ENTRY;
1473
1474         if (rc)
1475                 lovset->set_completes = 0;
1476         err = lov_fini_punch_set(lovset);
1477         RETURN(rc ? rc : err);
1478 }
1479
1480 /* FIXME: maybe we'll just make one node the authoritative attribute node, then
1481  * we can send this 'punch' to just the authoritative node and the nodes
1482  * that the punch will affect. */
1483 static int lov_punch(struct obd_export *exp, struct obd_info *oinfo,
1484                      struct obd_trans_info *oti,
1485                      struct ptlrpc_request_set *rqset)
1486 {
1487         struct lov_request_set *set;
1488         struct lov_obd *lov;
1489         struct list_head *pos;
1490         struct lov_request *req;
1491         int rc = 0;
1492         ENTRY;
1493
1494         LASSERT(oinfo);
1495         ASSERT_LSM_MAGIC(oinfo->oi_md);
1496
1497         if (!exp || !exp->exp_obd)
1498                 RETURN(-ENODEV);
1499
1500         lov = &exp->exp_obd->u.lov;
1501         rc = lov_prep_punch_set(exp, oinfo, oti, &set);
1502         if (rc)
1503                 RETURN(rc);
1504
1505         list_for_each (pos, &set->set_list) {
1506                 req = list_entry(pos, struct lov_request, rq_link);
1507
1508                 rc = obd_punch(lov->lov_tgts[req->rq_idx]->ltd_exp,
1509                                &req->rq_oi, NULL, rqset);
1510                 if (rc) {
1511                         CERROR("error: punch objid "LPX64" subobj "LPX64
1512                                " on OST idx %d: rc = %d\n",
1513                                set->set_oi->oi_oa->o_id,
1514                                req->rq_oi.oi_oa->o_id, req->rq_idx, rc);
1515                         break;
1516                 }
1517         }
1518
1519         if (rc || list_empty(&rqset->set_requests)) {
1520                 int err;
1521                 err = lov_fini_punch_set(set);
1522                 RETURN(rc ? rc : err);
1523         }
1524
1525         LASSERT(rqset->set_interpret == NULL);
1526         rqset->set_interpret = lov_punch_interpret;
1527         rqset->set_arg = (void *)set;
1528
1529         RETURN(0);
1530 }
1531
1532 static int lov_sync(struct obd_export *exp, struct obdo *oa,
1533                     struct lov_stripe_md *lsm, obd_off start, obd_off end,
1534                     void *capa)
1535 {
1536         struct lov_request_set *set;
1537         struct obd_info oinfo;
1538         struct lov_obd *lov;
1539         struct list_head *pos;
1540         struct lov_request *req;
1541         int err = 0, rc = 0;
1542         ENTRY;
1543
1544         ASSERT_LSM_MAGIC(lsm);
1545
1546         if (!exp->exp_obd)
1547                 RETURN(-ENODEV);
1548
1549         lov = &exp->exp_obd->u.lov;
1550         rc = lov_prep_sync_set(exp, &oinfo, oa, lsm, start, end, &set);
1551         if (rc)
1552                 RETURN(rc);
1553
1554         list_for_each (pos, &set->set_list) {
1555                 req = list_entry(pos, struct lov_request, rq_link);
1556
1557                 rc = obd_sync(lov->lov_tgts[req->rq_idx]->ltd_exp,
1558                               req->rq_oi.oi_oa, NULL,
1559                               req->rq_oi.oi_policy.l_extent.start,
1560                               req->rq_oi.oi_policy.l_extent.end, capa);
1561                 err = lov_update_common_set(set, req, rc);
1562                 if (err) {
1563                         CERROR("error: fsync objid "LPX64" subobj "LPX64
1564                                " on OST idx %d: rc = %d\n",
1565                                set->set_oi->oi_oa->o_id,
1566                                req->rq_oi.oi_oa->o_id, req->rq_idx, rc);
1567                         if (!rc)
1568                                 rc = err;
1569                 }
1570         }
1571         err = lov_fini_sync_set(set);
1572         if (!rc)
1573                 rc = err;
1574         RETURN(rc);
1575 }
1576
1577 static int lov_brw_check(struct lov_obd *lov, struct obd_info *lov_oinfo,
1578                          obd_count oa_bufs, struct brw_page *pga)
1579 {
1580         struct obd_info oinfo = { { { 0 } } };
1581         int i, rc = 0;
1582
1583         oinfo.oi_oa = lov_oinfo->oi_oa;
1584
1585         /* The caller just wants to know if there's a chance that this
1586          * I/O can succeed */
1587         for (i = 0; i < oa_bufs; i++) {
1588                 int stripe = lov_stripe_number(lov_oinfo->oi_md, pga[i].off);
1589                 int ost = lov_oinfo->oi_md->lsm_oinfo[stripe]->loi_ost_idx;
1590                 obd_off start, end;
1591
1592                 if (!lov_stripe_intersects(lov_oinfo->oi_md, i, pga[i].off,
1593                                            pga[i].off + pga[i].count - 1,
1594                                            &start, &end))
1595                         continue;
1596
1597                 if (!lov->lov_tgts[ost] || !lov->lov_tgts[ost]->ltd_active) {
1598                         CDEBUG(D_HA, "lov idx %d inactive\n", ost);
1599                         return -EIO;
1600                 }
1601
1602                 rc = obd_brw(OBD_BRW_CHECK, lov->lov_tgts[ost]->ltd_exp, &oinfo,
1603                              1, &pga[i], NULL);
1604                 if (rc)
1605                         break;
1606         }
1607         return rc;
1608 }
1609
1610 static int lov_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1611                    obd_count oa_bufs, struct brw_page *pga,
1612                    struct obd_trans_info *oti)
1613 {
1614         struct lov_request_set *set;
1615         struct lov_request *req;
1616         struct list_head *pos;
1617         struct lov_obd *lov = &exp->exp_obd->u.lov;
1618         int err, rc = 0;
1619         ENTRY;
1620
1621         ASSERT_LSM_MAGIC(oinfo->oi_md);
1622
1623         if (cmd == OBD_BRW_CHECK) {
1624                 rc = lov_brw_check(lov, oinfo, oa_bufs, pga);
1625                 RETURN(rc);
1626         }
1627
1628         rc = lov_prep_brw_set(exp, oinfo, oa_bufs, pga, oti, &set);
1629         if (rc)
1630                 RETURN(rc);
1631
1632         list_for_each (pos, &set->set_list) {
1633                 struct obd_export *sub_exp;
1634                 struct brw_page *sub_pga;
1635                 req = list_entry(pos, struct lov_request, rq_link);
1636
1637                 sub_exp = lov->lov_tgts[req->rq_idx]->ltd_exp;
1638                 sub_pga = set->set_pga + req->rq_pgaidx;
1639                 rc = obd_brw(cmd, sub_exp, &req->rq_oi, req->rq_oabufs,
1640                              sub_pga, oti);
1641                 if (rc)
1642                         break;
1643                 lov_update_common_set(set, req, rc);
1644         }
1645
1646         err = lov_fini_brw_set(set);
1647         if (!rc)
1648                 rc = err;
1649         RETURN(rc);
1650 }
1651
1652 static int lov_enqueue_interpret(struct ptlrpc_request_set *rqset,
1653                                  void *data, int rc)
1654 {
1655         struct lov_request_set *lovset = (struct lov_request_set *)data;
1656         ENTRY;
1657         rc = lov_fini_enqueue_set(lovset, lovset->set_ei->ei_mode, rc, rqset);
1658         RETURN(rc);
1659 }
1660
1661 static int lov_enqueue(struct obd_export *exp, struct obd_info *oinfo,
1662                        struct ldlm_enqueue_info *einfo,
1663                        struct ptlrpc_request_set *rqset)
1664 {
1665         ldlm_mode_t mode = einfo->ei_mode;
1666         struct lov_request_set *set;
1667         struct lov_request *req;
1668         struct list_head *pos;
1669         struct lov_obd *lov;
1670         ldlm_error_t rc;
1671         ENTRY;
1672
1673         LASSERT(oinfo);
1674         ASSERT_LSM_MAGIC(oinfo->oi_md);
1675         LASSERT(mode == (mode & -mode));
1676
1677         /* we should never be asked to replay a lock this way. */
1678         LASSERT((oinfo->oi_flags & LDLM_FL_REPLAY) == 0);
1679
1680         if (!exp || !exp->exp_obd)
1681                 RETURN(-ENODEV);
1682
1683         lov = &exp->exp_obd->u.lov;
1684         rc = lov_prep_enqueue_set(exp, oinfo, einfo, &set);
1685         if (rc)
1686                 RETURN(rc);
1687
1688         list_for_each (pos, &set->set_list) {
1689                 req = list_entry(pos, struct lov_request, rq_link);
1690
1691                 rc = obd_enqueue(lov->lov_tgts[req->rq_idx]->ltd_exp,
1692                                  &req->rq_oi, einfo, rqset);
1693                 if (rc != ELDLM_OK)
1694                         GOTO(out, rc);
1695         }
1696
1697         if (rqset && !list_empty(&rqset->set_requests)) {
1698                 LASSERT(rc == 0);
1699                 LASSERT(rqset->set_interpret == NULL);
1700                 rqset->set_interpret = lov_enqueue_interpret;
1701                 rqset->set_arg = (void *)set;
1702                 RETURN(rc);
1703         }
1704 out:
1705         rc = lov_fini_enqueue_set(set, mode, rc, rqset);
1706         RETURN(rc);
1707 }
1708
1709 static int lov_change_cbdata(struct obd_export *exp,
1710                              struct lov_stripe_md *lsm, ldlm_iterator_t it,
1711                              void *data)
1712 {
1713         struct lov_obd *lov;
1714         int rc = 0, i;
1715         ENTRY;
1716
1717         ASSERT_LSM_MAGIC(lsm);
1718
1719         if (!exp || !exp->exp_obd)
1720                 RETURN(-ENODEV);
1721
1722         LASSERT_MDS_GROUP(lsm->lsm_object_gr);
1723
1724         lov = &exp->exp_obd->u.lov;
1725         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1726                 struct lov_stripe_md submd;
1727                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1728
1729                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1730                         CDEBUG(D_HA, "lov idx %d NULL \n", loi->loi_ost_idx);
1731                         continue;
1732                 }
1733
1734                 submd.lsm_object_id = loi->loi_id;
1735                 submd.lsm_object_gr = lsm->lsm_object_gr;
1736                 submd.lsm_stripe_count = 0;
1737                 rc = obd_change_cbdata(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1738                                        &submd, it, data);
1739         }
1740         RETURN(rc);
1741 }
1742
1743 static int lov_cancel(struct obd_export *exp, struct lov_stripe_md *lsm,
1744                       __u32 mode, struct lustre_handle *lockh)
1745 {
1746         struct lov_request_set *set;
1747         struct obd_info oinfo;
1748         struct lov_request *req;
1749         struct list_head *pos;
1750         struct lov_obd *lov;
1751         struct lustre_handle *lov_lockhp;
1752         int err = 0, rc = 0;
1753         ENTRY;
1754
1755         ASSERT_LSM_MAGIC(lsm);
1756
1757         if (!exp || !exp->exp_obd)
1758                 RETURN(-ENODEV);
1759
1760         LASSERT_MDS_GROUP(lsm->lsm_object_gr);
1761         LASSERT(lockh);
1762         lov = &exp->exp_obd->u.lov;
1763         rc = lov_prep_cancel_set(exp, &oinfo, lsm, mode, lockh, &set);
1764         if (rc)
1765                 RETURN(rc);
1766
1767         list_for_each (pos, &set->set_list) {
1768                 req = list_entry(pos, struct lov_request, rq_link);
1769                 lov_lockhp = set->set_lockh->llh_handles + req->rq_stripe;
1770
1771                 rc = obd_cancel(lov->lov_tgts[req->rq_idx]->ltd_exp,
1772                                 req->rq_oi.oi_md, mode, lov_lockhp);
1773                 rc = lov_update_common_set(set, req, rc);
1774                 if (rc) {
1775                         CERROR("error: cancel objid "LPX64" subobj "
1776                                LPX64" on OST idx %d: rc = %d\n",
1777                                lsm->lsm_object_id,
1778                                req->rq_oi.oi_md->lsm_object_id,
1779                                req->rq_idx, rc);
1780                         err = rc;
1781                 }
1782
1783         }
1784         lov_fini_cancel_set(set);
1785         RETURN(err);
1786 }
1787
1788 static int lov_cancel_unused(struct obd_export *exp,
1789                              struct lov_stripe_md *lsm,
1790                              int flags, void *opaque)
1791 {
1792         struct lov_obd *lov;
1793         int rc = 0, i;
1794         ENTRY;
1795
1796         if (!exp || !exp->exp_obd)
1797                 RETURN(-ENODEV);
1798
1799         lov = &exp->exp_obd->u.lov;
1800         if (lsm == NULL) {
1801                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1802                         int err;
1803                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1804                                 continue;
1805
1806                         err = obd_cancel_unused(lov->lov_tgts[i]->ltd_exp, NULL,
1807                                                 flags, opaque);
1808                         if (!rc)
1809                                 rc = err;
1810                 }
1811                 RETURN(rc);
1812         }
1813
1814         ASSERT_LSM_MAGIC(lsm);
1815
1816         LASSERT_MDS_GROUP(lsm->lsm_object_gr);
1817         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1818                 struct lov_stripe_md submd;
1819                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1820                 int err;
1821
1822                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1823                         CDEBUG(D_HA, "lov idx %d NULL\n", loi->loi_ost_idx);
1824                         continue;
1825                 }
1826
1827                 if (!lov->lov_tgts[loi->loi_ost_idx]->ltd_active)
1828                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1829
1830                 submd.lsm_object_id = loi->loi_id;
1831                 submd.lsm_object_gr = lsm->lsm_object_gr;
1832                 submd.lsm_stripe_count = 0;
1833                 err = obd_cancel_unused(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1834                                         &submd, flags, opaque);
1835                 if (err && lov->lov_tgts[loi->loi_ost_idx]->ltd_active) {
1836                         CERROR("error: cancel unused objid "LPX64" subobj "LPX64
1837                                " on OST idx %d: rc = %d\n", lsm->lsm_object_id,
1838                                loi->loi_id, loi->loi_ost_idx, err);
1839                         if (!rc)
1840                                 rc = err;
1841                 }
1842         }
1843         RETURN(rc);
1844 }
1845
1846 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1847 {
1848         struct lov_request_set *lovset = (struct lov_request_set *)data;
1849         int err;
1850         ENTRY;
1851
1852         if (rc)
1853                 lovset->set_completes = 0;
1854
1855         err = lov_fini_statfs_set(lovset);
1856         RETURN(rc ? rc : err);
1857 }
1858
1859 static int lov_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
1860                             __u64 max_age, struct ptlrpc_request_set *rqset)
1861 {
1862         struct lov_request_set *set;
1863         struct lov_request *req;
1864         struct list_head *pos;
1865         struct lov_obd *lov;
1866         int rc = 0;
1867         ENTRY;
1868
1869         LASSERT(oinfo != NULL);
1870         LASSERT(oinfo->oi_osfs != NULL);
1871
1872         lov = &obd->u.lov;
1873         rc = lov_prep_statfs_set(obd, oinfo, &set);
1874         if (rc)
1875                 RETURN(rc);
1876
1877         list_for_each (pos, &set->set_list) {
1878                 struct obd_device *osc_obd;
1879
1880                 req = list_entry(pos, struct lov_request, rq_link);
1881
1882                 osc_obd = class_exp2obd(lov->lov_tgts[req->rq_idx]->ltd_exp);
1883                 rc = obd_statfs_async(osc_obd, &req->rq_oi, max_age, rqset);
1884                 if (rc)
1885                         break;
1886         }
1887
1888         if (rc || list_empty(&rqset->set_requests)) {
1889                 int err;
1890                 if (rc)
1891                         set->set_completes = 0;
1892                 err = lov_fini_statfs_set(set);
1893                 RETURN(rc ? rc : err);
1894         }
1895
1896         LASSERT(rqset->set_interpret == NULL);
1897         rqset->set_interpret = lov_statfs_interpret;
1898         rqset->set_arg = (void *)set;
1899         RETURN(0);
1900 }
1901
1902 static int lov_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1903                       __u64 max_age, __u32 flags)
1904 {
1905         struct ptlrpc_request_set *set = NULL;
1906         struct obd_info oinfo = { { { 0 } } };
1907         int rc = 0;
1908         ENTRY;
1909
1910
1911         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1912          * statfs requests */
1913         set = ptlrpc_prep_set();
1914         if (set == NULL)
1915                 RETURN(-ENOMEM);
1916
1917         oinfo.oi_osfs = osfs;
1918         oinfo.oi_flags = flags;
1919         rc = lov_statfs_async(obd, &oinfo, max_age, set);
1920         if (rc == 0)
1921                 rc = ptlrpc_set_wait(set);
1922         ptlrpc_set_destroy(set);
1923
1924         RETURN(rc);
1925 }
1926
1927 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1928                          void *karg, void *uarg)
1929 {
1930         struct obd_device *obddev = class_exp2obd(exp);
1931         struct lov_obd *lov = &obddev->u.lov;
1932         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1933         struct obd_uuid *uuidp;
1934         ENTRY;
1935
1936         switch (cmd) {
1937         case IOC_OBD_STATFS: {
1938                 struct obd_ioctl_data *data = karg;
1939                 struct obd_device *osc_obd;
1940                 struct obd_statfs stat_buf = {0};
1941                 __u32 index;
1942
1943                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1944                 LASSERT(data->ioc_plen1 == sizeof(struct obd_statfs));
1945
1946                 if ((index >= count))
1947                         RETURN(-ENODEV);
1948
1949                 if (!lov->lov_tgts[index])
1950                         /* Try again with the next index */
1951                         RETURN(-EAGAIN);
1952                 if (!lov->lov_tgts[index]->ltd_active)
1953                         RETURN(-ENODATA);
1954
1955                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1956                 if (!osc_obd)
1957                         RETURN(-EINVAL);
1958
1959                 /* got statfs data */
1960                 rc = obd_statfs(osc_obd, &stat_buf,
1961                                 cfs_time_current_64() - HZ, 0);
1962                 if (rc)
1963                         RETURN(rc);
1964                 if (copy_to_user(data->ioc_pbuf1, &stat_buf, data->ioc_plen1))
1965                         RETURN(-EFAULT);
1966                 /* copy UUID */
1967                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1968                                  data->ioc_plen2))
1969                         RETURN(-EFAULT);
1970                 break;
1971         }
1972         case OBD_IOC_LOV_GET_CONFIG: {
1973                 struct obd_ioctl_data *data;
1974                 struct lov_desc *desc;
1975                 char *buf = NULL;
1976                 __u32 *genp;
1977
1978                 len = 0;
1979                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
1980                         RETURN(-EINVAL);
1981
1982                 data = (struct obd_ioctl_data *)buf;
1983
1984                 if (sizeof(*desc) > data->ioc_inllen1) {
1985                         obd_ioctl_freedata(buf, len);
1986                         RETURN(-EINVAL);
1987                 }
1988
1989                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1990                         obd_ioctl_freedata(buf, len);
1991                         RETURN(-EINVAL);
1992                 }
1993
1994                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1995                         obd_ioctl_freedata(buf, len);
1996                         RETURN(-EINVAL);
1997                 }
1998
1999                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2000                 memcpy(desc, &(lov->desc), sizeof(*desc));
2001
2002                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
2003                 genp = (__u32 *)data->ioc_inlbuf3;
2004                 /* the uuid will be empty for deleted OSTs */
2005                 for (i = 0; i < count; i++, uuidp++, genp++) {
2006                         if (!lov->lov_tgts[i])
2007                                 continue;
2008                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
2009                         *genp = lov->lov_tgts[i]->ltd_gen;
2010                 }
2011
2012                 if (copy_to_user((void *)uarg, buf, len))
2013                         rc = -EFAULT;
2014                 obd_ioctl_freedata(buf, len);
2015                 break;
2016         }
2017         case LL_IOC_LOV_SETSTRIPE:
2018                 rc = lov_setstripe(exp, len, karg, uarg);
2019                 break;
2020         case LL_IOC_LOV_GETSTRIPE:
2021                 rc = lov_getstripe(exp, karg, uarg);
2022                 break;
2023         case LL_IOC_LOV_SETEA:
2024                 rc = lov_setea(exp, karg, uarg);
2025                 break;
2026         case OBD_IOC_QUOTACTL: {
2027                 struct if_quotactl *qctl = karg;
2028                 struct lov_tgt_desc *tgt = NULL;
2029                 struct obd_quotactl *oqctl;
2030
2031                 if (qctl->qc_valid == QC_OSTIDX) {
2032                         if (qctl->qc_idx < 0 || count <= qctl->qc_idx)
2033                                 RETURN(-EINVAL);
2034
2035                         tgt = lov->lov_tgts[qctl->qc_idx];
2036                         if (!tgt || !tgt->ltd_exp)
2037                                 RETURN(-EINVAL);
2038                 } else if (qctl->qc_valid == QC_UUID) {
2039                         for (i = 0; i < count; i++) {
2040                                 tgt = lov->lov_tgts[i];
2041                                 if (!tgt ||
2042                                     !obd_uuid_equals(&tgt->ltd_uuid,
2043                                                      &qctl->obd_uuid))
2044                                         continue;
2045
2046                                 if (tgt->ltd_exp == NULL)
2047                                         RETURN(-EINVAL);
2048
2049                                 break;
2050                         }
2051                 } else {
2052                         RETURN(-EINVAL);
2053                 }
2054
2055                 if (i >= count)
2056                         RETURN(-EAGAIN);
2057
2058                 LASSERT(tgt && tgt->ltd_exp);
2059                 OBD_ALLOC_PTR(oqctl);
2060                 if (!oqctl)
2061                         RETURN(-ENOMEM);
2062
2063                 QCTL_COPY(oqctl, qctl);
2064                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
2065                 if (rc == 0) {
2066                         QCTL_COPY(qctl, oqctl);
2067                         qctl->qc_valid = QC_OSTIDX;
2068                         qctl->obd_uuid = tgt->ltd_uuid;
2069                 }
2070                 OBD_FREE_PTR(oqctl);
2071                 break;
2072         }
2073         default: {
2074                 int set = 0;
2075
2076                 if (count == 0)
2077                         RETURN(-ENOTTY);
2078
2079                 for (i = 0; i < count; i++) {
2080                         int err;
2081
2082                         /* OST was disconnected */
2083                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
2084                                 continue;
2085
2086                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
2087                                             len, karg, uarg);
2088                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
2089                                 RETURN(err);
2090                         } else if (err) {
2091                                 if (lov->lov_tgts[i]->ltd_active) {
2092                                         CDEBUG(err == -ENOTTY ?
2093                                                D_IOCTL : D_WARNING,
2094                                                "iocontrol OSC %s on OST "
2095                                                "idx %d cmd %x: err = %d\n",
2096                                                lov_uuid2str(lov, i),
2097                                                i, cmd, err);
2098                                         if (!rc)
2099                                                 rc = err;
2100                                 }
2101                         } else {
2102                                 set = 1;
2103                         }
2104                 }
2105                 if (!set && !rc)
2106                         rc = -EIO;
2107         }
2108         }
2109
2110         RETURN(rc);
2111 }
2112
2113 #define FIEMAP_BUFFER_SIZE 4096
2114
2115 /**
2116  * Non-zero fe_logical indicates that this is a continuation FIEMAP
2117  * call. The local end offset and the device are sent in the first
2118  * fm_extent. This function calculates the stripe number from the index.
2119  * This function returns a stripe_no on which mapping is to be restarted.
2120  *
2121  * This function returns fm_end_offset which is the in-OST offset at which
2122  * mapping should be restarted. If fm_end_offset=0 is returned then caller
2123  * will re-calculate proper offset in next stripe.
2124  * Note that the first extent is passed to lov_get_info via the value field.
2125  *
2126  * \param fiemap fiemap request header
2127  * \param lsm striping information for the file
2128  * \param fm_start logical start of mapping
2129  * \param fm_end logical end of mapping
2130  * \param start_stripe starting stripe will be returned in this
2131  */
2132 obd_size fiemap_calc_fm_end_offset(struct ll_user_fiemap *fiemap,
2133                                    struct lov_stripe_md *lsm, obd_size fm_start,
2134                                    obd_size fm_end, int *start_stripe)
2135 {
2136         obd_size local_end = fiemap->fm_extents[0].fe_logical;
2137         obd_off lun_start, lun_end;
2138         obd_size fm_end_offset;
2139         int stripe_no = -1, i;
2140
2141         if (fiemap->fm_extent_count == 0 ||
2142             fiemap->fm_extents[0].fe_logical == 0)
2143                 return 0;
2144
2145         /* Find out stripe_no from ost_index saved in the fe_device */
2146         for (i = 0; i < lsm->lsm_stripe_count; i++) {
2147                 if (lsm->lsm_oinfo[i]->loi_ost_idx ==
2148                                         fiemap->fm_extents[0].fe_device) {
2149                         stripe_no = i;
2150                         break;
2151                 }
2152         }
2153
2154         /* If we have finished mapping on previous device, shift logical
2155          * offset to start of next device */
2156         if ((lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
2157                                    &lun_start, &lun_end)) != 0 &&
2158                                    local_end < lun_end) {
2159                 fm_end_offset = local_end;
2160                 *start_stripe = stripe_no;
2161         } else {
2162                 /* This is a special value to indicate that caller should
2163                  * calculate offset in next stripe. */
2164                 fm_end_offset = 0;
2165                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
2166         }
2167
2168         return fm_end_offset;
2169 }
2170
2171 /**
2172  * We calculate on which OST the mapping will end. If the length of mapping
2173  * is greater than (stripe_size * stripe_count) then the last_stripe will
2174  * will be one just before start_stripe. Else we check if the mapping
2175  * intersects each OST and find last_stripe.
2176  * This function returns the last_stripe and also sets the stripe_count
2177  * over which the mapping is spread
2178  *
2179  * \param lsm striping information for the file
2180  * \param fm_start logical start of mapping
2181  * \param fm_end logical end of mapping
2182  * \param start_stripe starting stripe of the mapping
2183  * \param stripe_count the number of stripes across which to map is returned
2184  *
2185  * \retval last_stripe return the last stripe of the mapping
2186  */
2187 int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, obd_size fm_start,
2188                             obd_size fm_end, int start_stripe,
2189                             int *stripe_count)
2190 {
2191         int last_stripe;
2192         obd_off obd_start, obd_end;
2193         int i, j;
2194
2195         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
2196                 last_stripe = (start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
2197                                                               start_stripe - 1);
2198                 *stripe_count = lsm->lsm_stripe_count;
2199         } else {
2200                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
2201                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
2202                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
2203                                                    &obd_start, &obd_end)) == 0)
2204                                 break;
2205                 }
2206                 *stripe_count = j;
2207                 last_stripe = (start_stripe + j - 1) %lsm->lsm_stripe_count;
2208         }
2209
2210         return last_stripe;
2211 }
2212
2213 /**
2214  * Set fe_device and copy extents from local buffer into main return buffer.
2215  *
2216  * \param fiemap fiemap request header
2217  * \param lcl_fm_ext array of local fiemap extents to be copied
2218  * \param ost_index OST index to be written into the fm_device field for each
2219                     extent
2220  * \param ext_count number of extents to be copied
2221  * \param current_extent where to start copying in main extent array
2222  */
2223 void fiemap_prepare_and_copy_exts(struct ll_user_fiemap *fiemap,
2224                                   struct ll_fiemap_extent *lcl_fm_ext,
2225                                   int ost_index, unsigned int ext_count,
2226                                   int current_extent)
2227 {
2228         char *to;
2229         int ext;
2230
2231         for (ext = 0; ext < ext_count; ext++) {
2232                 lcl_fm_ext[ext].fe_device = ost_index;
2233                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
2234         }
2235
2236         /* Copy fm_extent's from fm_local to return buffer */
2237         to = (char *)fiemap + fiemap_count_to_size(current_extent);
2238         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct ll_fiemap_extent));
2239 }
2240
2241 /**
2242  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
2243  * This also handles the restarting of FIEMAP calls in case mapping overflows
2244  * the available number of extents in single call.
2245  */
2246 static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
2247                       __u32 *vallen, void *val, struct lov_stripe_md *lsm)
2248 {
2249         struct ll_fiemap_info_key *fm_key = key;
2250         struct ll_user_fiemap *fiemap = val;
2251         struct ll_user_fiemap *fm_local = NULL;
2252         struct ll_fiemap_extent *lcl_fm_ext;
2253         int count_local;
2254         unsigned int get_num_extents = 0;
2255         int ost_index = 0, actual_start_stripe, start_stripe;
2256         obd_size fm_start, fm_end, fm_length, fm_end_offset = 0;
2257         obd_size curr_loc;
2258         int current_extent = 0, rc = 0, i;
2259         int ost_eof = 0; /* EOF for object */
2260         int ost_done = 0; /* done with required mapping for this OST? */
2261         int last_stripe;
2262         int cur_stripe = 0, cur_stripe_wrap = 0, stripe_count;
2263         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
2264
2265         if (lsm == NULL)
2266                 GOTO(out, rc = 0);
2267
2268         if (fiemap_count_to_size(fm_key->fiemap.fm_extent_count) < buffer_size)
2269                 buffer_size = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
2270
2271         OBD_ALLOC(fm_local, buffer_size);
2272         if (fm_local == NULL)
2273                 GOTO(out, rc = -ENOMEM);
2274         lcl_fm_ext = &fm_local->fm_extents[0];
2275
2276         count_local = fiemap_size_to_count(buffer_size);
2277
2278         memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
2279         fm_start = fiemap->fm_start;
2280         fm_length = fiemap->fm_length;
2281         /* Calculate start stripe, last stripe and length of mapping */
2282         actual_start_stripe = start_stripe = lov_stripe_number(lsm, fm_start);
2283         fm_end = (fm_length == ~0ULL ? fm_key->oa.o_size :
2284                                                 fm_start + fm_length - 1);
2285         /* If fm_length != ~0ULL but fm_start+fm_length-1 exceeds file size */
2286         if (fm_end > fm_key->oa.o_size)
2287                 fm_end = fm_key->oa.o_size;
2288
2289         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
2290                                             actual_start_stripe, &stripe_count);
2291
2292         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start, fm_end,
2293                                                   &start_stripe);
2294
2295         if (fiemap->fm_extent_count == 0) {
2296                 get_num_extents = 1;
2297                 count_local = 0;
2298         }
2299
2300         /* Check each stripe */
2301         for (cur_stripe = start_stripe, i = 0; i < stripe_count;
2302              i++, cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
2303                 obd_size req_fm_len; /* Stores length of required mapping */
2304                 obd_size len_mapped_single_call;
2305                 obd_off lun_start, lun_end, obd_object_end;
2306                 unsigned int ext_count;
2307
2308                 cur_stripe_wrap = cur_stripe;
2309
2310                 /* Find out range of mapping on this stripe */
2311                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
2312                                            &lun_start, &obd_object_end)) == 0)
2313                         continue;
2314
2315                 /* If this is a continuation FIEMAP call and we are on
2316                  * starting stripe then lun_start needs to be set to
2317                  * fm_end_offset */
2318                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
2319                         lun_start = fm_end_offset;
2320
2321                 if (fm_length != ~0ULL) {
2322                         /* Handle fm_start + fm_length overflow */
2323                         if (fm_start + fm_length < fm_start)
2324                                 fm_length = ~0ULL - fm_start;
2325                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
2326                                                      cur_stripe);
2327                 } else {
2328                         lun_end = ~0ULL;
2329                 }
2330
2331                 if (lun_start == lun_end)
2332                         continue;
2333
2334                 req_fm_len = obd_object_end - lun_start;
2335                 fm_local->fm_length = 0;
2336                 len_mapped_single_call = 0;
2337
2338                 /* If the output buffer is very large and the objects have many
2339                  * extents we may need to loop on a single OST repeatedly */
2340                 ost_eof = 0;
2341                 ost_done = 0;
2342                 do {
2343                         if (get_num_extents == 0) {
2344                                 /* Don't get too many extents. */
2345                                 if (current_extent + count_local >
2346                                     fiemap->fm_extent_count)
2347                                         count_local = fiemap->fm_extent_count -
2348                                                                  current_extent;
2349                         }
2350
2351                         lun_start += len_mapped_single_call;
2352                         fm_local->fm_length = req_fm_len - len_mapped_single_call;
2353                         req_fm_len = fm_local->fm_length;
2354                         fm_local->fm_extent_count = count_local;
2355                         fm_local->fm_mapped_extents = 0;
2356                         fm_local->fm_flags = fiemap->fm_flags;
2357
2358                         fm_key->oa.o_id = lsm->lsm_oinfo[cur_stripe]->loi_id;
2359                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
2360
2361                         if (ost_index < 0 || ost_index >=lov->desc.ld_tgt_count)
2362                                 GOTO(out, rc = -EINVAL);
2363
2364                         /* If OST is inactive, return extent with UNKNOWN flag */
2365                         if (!lov->lov_tgts[ost_index]->ltd_active) {
2366                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
2367                                 fm_local->fm_mapped_extents = 1;
2368
2369                                 lcl_fm_ext[0].fe_logical = lun_start;
2370                                 lcl_fm_ext[0].fe_length = obd_object_end -
2371                                                                       lun_start;
2372                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
2373
2374                                 goto inactive_tgt;
2375                         }
2376
2377                         fm_local->fm_start = lun_start;
2378                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
2379                         memcpy(&fm_key->fiemap, fm_local, sizeof(*fm_local));
2380                         *vallen=fiemap_count_to_size(fm_local->fm_extent_count);
2381                         rc = obd_get_info(lov->lov_tgts[ost_index]->ltd_exp,
2382                                           keylen, key, vallen, fm_local, lsm);
2383                         if (rc != 0)
2384                                 GOTO(out, rc);
2385
2386 inactive_tgt:
2387                         ext_count = fm_local->fm_mapped_extents;
2388                         if (ext_count == 0) {
2389                                 ost_done = 1;
2390                                 /* If last stripe has hole at the end,
2391                                  * then we need to return */
2392                                 if (cur_stripe_wrap == last_stripe) {
2393                                         fiemap->fm_mapped_extents = 0;
2394                                         goto finish;
2395                                 }
2396                                 break;
2397                         }
2398
2399                         /* If we just need num of extents then go to next device */
2400                         if (get_num_extents) {
2401                                 current_extent += ext_count;
2402                                 break;
2403                         }
2404
2405                         len_mapped_single_call = lcl_fm_ext[ext_count-1].fe_logical -
2406                                   lun_start + lcl_fm_ext[ext_count - 1].fe_length;
2407
2408                         /* Have we finished mapping on this device? */
2409                         if (req_fm_len <= len_mapped_single_call)
2410                                 ost_done = 1;
2411
2412                         /* Clear the EXTENT_LAST flag which can be present on
2413                          * last extent */
2414                         if (lcl_fm_ext[ext_count-1].fe_flags & FIEMAP_EXTENT_LAST)
2415                                 lcl_fm_ext[ext_count - 1].fe_flags &=
2416                                                             ~FIEMAP_EXTENT_LAST;
2417
2418                         curr_loc = lov_stripe_size(lsm,
2419                                            lcl_fm_ext[ext_count - 1].fe_logical+
2420                                            lcl_fm_ext[ext_count - 1].fe_length,
2421                                            cur_stripe);
2422                         if (curr_loc >= fm_key->oa.o_size)
2423                                 ost_eof = 1;
2424
2425                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
2426                                                      ost_index, ext_count,
2427                                                      current_extent);
2428
2429                         current_extent += ext_count;
2430
2431                         /* Ran out of available extents? */
2432                         if (current_extent >= fiemap->fm_extent_count)
2433                                 goto finish;
2434                 } while (ost_done == 0 && ost_eof == 0);
2435
2436                 if (cur_stripe_wrap == last_stripe)
2437                         goto finish;
2438         }
2439
2440 finish:
2441         /* Indicate that we are returning device offsets unless file just has
2442          * single stripe */
2443         if (lsm->lsm_stripe_count > 1)
2444                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
2445
2446         if (get_num_extents)
2447                 goto skip_last_device_calc;
2448
2449         /* Check if we have reached the last stripe and whether mapping for that
2450          * stripe is done. */
2451         if (cur_stripe_wrap == last_stripe) {
2452                 if (ost_done || ost_eof)
2453                         fiemap->fm_extents[current_extent - 1].fe_flags |=
2454                                                              FIEMAP_EXTENT_LAST;
2455         }
2456
2457 skip_last_device_calc:
2458         fiemap->fm_mapped_extents = current_extent;
2459
2460 out:
2461         OBD_FREE(fm_local, buffer_size);
2462         return rc;
2463 }
2464
2465 static int lov_get_info(struct obd_export *exp, __u32 keylen,
2466                         void *key, __u32 *vallen, void *val,
2467                         struct lov_stripe_md *lsm)
2468 {
2469         struct obd_device *obddev = class_exp2obd(exp);
2470         struct lov_obd *lov = &obddev->u.lov;
2471         int i, rc;
2472         ENTRY;
2473
2474         if (!vallen || !val)
2475                 RETURN(-EFAULT);
2476
2477         obd_getref(obddev);
2478
2479         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
2480                 struct {
2481                         char name[16];
2482                         struct ldlm_lock *lock;
2483                 } *data = key;
2484                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
2485                 struct lov_oinfo *loi;
2486                 __u32 *stripe = val;
2487
2488                 if (*vallen < sizeof(*stripe))
2489                         GOTO(out, rc = -EFAULT);
2490                 *vallen = sizeof(*stripe);
2491
2492                 /* XXX This is another one of those bits that will need to
2493                  * change if we ever actually support nested LOVs.  It uses
2494                  * the lock's export to find out which stripe it is. */
2495                 /* XXX - it's assumed all the locks for deleted OSTs have
2496                  * been cancelled. Also, the export for deleted OSTs will
2497                  * be NULL and won't match the lock's export. */
2498                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
2499                         loi = lsm->lsm_oinfo[i];
2500                         if (!lov->lov_tgts[loi->loi_ost_idx])
2501                                 continue;
2502                         if (lov->lov_tgts[loi->loi_ost_idx]->ltd_exp ==
2503                             data->lock->l_conn_export &&
2504                             osc_res_name_eq(loi->loi_id, loi->loi_gr, res_id)) {
2505                                 *stripe = i;
2506                                 GOTO(out, rc = 0);
2507                         }
2508                 }
2509                 LDLM_ERROR(data->lock, "lock on inode without such object");
2510                 dump_lsm(D_ERROR, lsm);
2511                 GOTO(out, rc = -ENXIO);
2512         } else if (KEY_IS(KEY_LAST_ID)) {
2513                 struct obd_id_info *info = val;
2514                 __u32 size = sizeof(obd_id);
2515                 struct lov_tgt_desc *tgt;
2516
2517                 LASSERT(*vallen == sizeof(struct obd_id_info));
2518                 tgt = lov->lov_tgts[info->idx];
2519
2520                 if (!tgt || !tgt->ltd_active)
2521                         GOTO(out, rc = -ESRCH);
2522
2523                 rc = obd_get_info(tgt->ltd_exp, keylen, key, &size, info->data, NULL);
2524                 GOTO(out, rc = 0);
2525         } else if (KEY_IS(KEY_LOVDESC)) {
2526                 struct lov_desc *desc_ret = val;
2527                 *desc_ret = lov->desc;
2528
2529                 GOTO(out, rc = 0);
2530         } else if (KEY_IS(KEY_FIEMAP)) {
2531                 rc = lov_fiemap(lov, keylen, key, vallen, val, lsm);
2532                 GOTO(out, rc);
2533         }
2534
2535         rc = -EINVAL;
2536
2537 out:
2538         obd_putref(obddev);
2539         RETURN(rc);
2540 }
2541
2542 static int lov_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 obd_device *obddev = class_exp2obd(exp);
2547         struct lov_obd *lov = &obddev->u.lov;
2548         obd_count count;
2549         int i, rc = 0, err;
2550         struct lov_tgt_desc *tgt;
2551         unsigned incr, check_uuid,
2552                  do_inactive, no_set;
2553         unsigned next_id = 0,  mds_con = 0, capa = 0;
2554         ENTRY;
2555
2556         incr = check_uuid = do_inactive = no_set = 0;
2557         if (set == NULL) {
2558                 no_set = 1;
2559                 set = ptlrpc_prep_set();
2560                 if (!set)
2561                         RETURN(-ENOMEM);
2562         }
2563
2564         obd_getref(obddev);
2565         count = lov->desc.ld_tgt_count;
2566
2567         if (KEY_IS(KEY_NEXT_ID)) {
2568                 count = vallen / sizeof(struct obd_id_info);
2569                 vallen = sizeof(obd_id);
2570                 incr = sizeof(struct obd_id_info);
2571                 do_inactive = 1;
2572                 next_id = 1;
2573         } else if (KEY_IS(KEY_CHECKSUM)) {
2574                 do_inactive = 1;
2575         } else if (KEY_IS(KEY_UNLINKED)) {
2576                 check_uuid = val ? 1 : 0;
2577         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2578                 /* use defaults:  do_inactive = incr = 0; */
2579         } else if (KEY_IS(KEY_MDS_CONN)) {
2580                 mds_con = 1;
2581         } else if (KEY_IS(KEY_CAPA_KEY)) {
2582                 capa = 1;
2583         }
2584
2585         for (i = 0; i < count; i++, val = (char *)val + incr) {
2586                 if (next_id) {
2587                         tgt = lov->lov_tgts[((struct obd_id_info*)val)->idx];
2588                 } else {
2589                         tgt = lov->lov_tgts[i];
2590                 }
2591                 /* OST was disconnected */
2592                 if (!tgt || !tgt->ltd_exp)
2593                         continue;
2594
2595                 /* OST is inactive and we don't want inactive OSCs */
2596                 if (!tgt->ltd_active && !do_inactive)
2597                         continue;
2598
2599                 if (mds_con) {
2600                         struct mds_group_info *mgi;
2601
2602                         LASSERT(vallen == sizeof(*mgi));
2603                         mgi = (struct mds_group_info *)val;
2604
2605                         /* Only want a specific OSC */
2606                         if (mgi->uuid && !obd_uuid_equals(mgi->uuid,
2607                                                 &tgt->ltd_uuid))
2608                                 continue;
2609
2610                         err = obd_set_info_async(tgt->ltd_exp,
2611                                          keylen, key, sizeof(int),
2612                                          &mgi->group, set);
2613                 } else if (next_id) {
2614                         err = obd_set_info_async(tgt->ltd_exp,
2615                                          keylen, key, vallen,
2616                                          ((struct obd_id_info*)val)->data, set);
2617                 } else if (capa) {
2618                         struct mds_capa_info *info = (struct mds_capa_info*)val;
2619
2620                         LASSERT(vallen == sizeof(*info));
2621
2622                          /* Only want a specific OSC */
2623                         if (info->uuid &&
2624                             !obd_uuid_equals(info->uuid, &tgt->ltd_uuid))
2625                                 continue;
2626
2627                         err = obd_set_info_async(tgt->ltd_exp, keylen, key,
2628                                                  sizeof(*info->capa),
2629                                                  info->capa, set);
2630
2631                 } else {
2632                         /* Only want a specific OSC */
2633                         if (check_uuid &&
2634                             !obd_uuid_equals(val, &tgt->ltd_uuid))
2635                                 continue;
2636
2637                         err = obd_set_info_async(tgt->ltd_exp,
2638                                          keylen, key, vallen, val, set);
2639                 }
2640
2641                 if (!rc)
2642                         rc = err;
2643         }
2644
2645         obd_putref(obddev);
2646         if (no_set) {
2647                 err = ptlrpc_set_wait(set);
2648                 if (!rc)
2649                         rc = err;
2650                 ptlrpc_set_destroy(set);
2651         }
2652         RETURN(rc);
2653 }
2654
2655 static int lov_checkmd(struct obd_export *exp, struct obd_export *md_exp,
2656                        struct lov_stripe_md *lsm)
2657 {
2658         int rc;
2659         ENTRY;
2660
2661         if (!lsm)
2662                 RETURN(0);
2663         LASSERT(md_exp);
2664         LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
2665         rc = lsm_op_find(lsm->lsm_magic)->lsm_revalidate(lsm, md_exp->exp_obd);
2666
2667         RETURN(rc);
2668 }
2669
2670 int lov_test_and_clear_async_rc(struct lov_stripe_md *lsm)
2671 {
2672         int i, rc = 0;
2673         ENTRY;
2674
2675         for (i = 0; i < lsm->lsm_stripe_count; i++) {
2676                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
2677                 if (loi->loi_ar.ar_rc && !rc)
2678                         rc = loi->loi_ar.ar_rc;
2679                 loi->loi_ar.ar_rc = 0;
2680         }
2681         RETURN(rc);
2682 }
2683 EXPORT_SYMBOL(lov_test_and_clear_async_rc);
2684
2685
2686 static int lov_extent_calc(struct obd_export *exp, struct lov_stripe_md *lsm,
2687                            int cmd, __u64 *offset)
2688 {
2689         __u32 ssize = lsm->lsm_stripe_size;
2690         __u64 start;
2691
2692         start = *offset;
2693         do_div(start, ssize);
2694         start = start * ssize;
2695
2696         CDEBUG(D_DLMTRACE, "offset "LPU64", stripe %u, start "LPU64
2697                            ", end "LPU64"\n", *offset, ssize, start,
2698                            start + ssize - 1);
2699         if (cmd == OBD_CALC_STRIPE_END) {
2700                 *offset = start + ssize - 1;
2701         } else if (cmd == OBD_CALC_STRIPE_START) {
2702                 *offset = start;
2703         } else {
2704                 LBUG();
2705         }
2706
2707         RETURN(0);
2708 }
2709
2710 void lov_stripe_lock(struct lov_stripe_md *md)
2711 {
2712         LASSERT(md->lsm_lock_owner != cfs_curproc_pid());
2713         spin_lock(&md->lsm_lock);
2714         LASSERT(md->lsm_lock_owner == 0);
2715         md->lsm_lock_owner = cfs_curproc_pid();
2716 }
2717 EXPORT_SYMBOL(lov_stripe_lock);
2718
2719 void lov_stripe_unlock(struct lov_stripe_md *md)
2720 {
2721         LASSERT(md->lsm_lock_owner == cfs_curproc_pid());
2722         md->lsm_lock_owner = 0;
2723         spin_unlock(&md->lsm_lock);
2724 }
2725 EXPORT_SYMBOL(lov_stripe_unlock);
2726
2727
2728 struct obd_ops lov_obd_ops = {
2729         .o_owner               = THIS_MODULE,
2730         .o_setup               = lov_setup,
2731         .o_precleanup          = lov_precleanup,
2732         .o_cleanup             = lov_cleanup,
2733         //.o_process_config      = lov_process_config,
2734         .o_connect             = lov_connect,
2735         .o_disconnect          = lov_disconnect,
2736         .o_statfs              = lov_statfs,
2737         .o_statfs_async        = lov_statfs_async,
2738         .o_packmd              = lov_packmd,
2739         .o_unpackmd            = lov_unpackmd,
2740         .o_checkmd             = lov_checkmd,
2741         .o_create              = lov_create,
2742         .o_destroy             = lov_destroy,
2743         .o_getattr             = lov_getattr,
2744         .o_getattr_async       = lov_getattr_async,
2745         .o_setattr             = lov_setattr,
2746         .o_setattr_async       = lov_setattr_async,
2747         .o_brw                 = lov_brw,
2748         .o_merge_lvb           = lov_merge_lvb,
2749         .o_adjust_kms          = lov_adjust_kms,
2750         .o_punch               = lov_punch,
2751         .o_sync                = lov_sync,
2752         .o_enqueue             = lov_enqueue,
2753         .o_change_cbdata       = lov_change_cbdata,
2754         .o_cancel              = lov_cancel,
2755         .o_cancel_unused       = lov_cancel_unused,
2756         .o_iocontrol           = lov_iocontrol,
2757         .o_get_info            = lov_get_info,
2758         .o_set_info_async      = lov_set_info_async,
2759         .o_extent_calc         = lov_extent_calc,
2760         .o_llog_init           = lov_llog_init,
2761         .o_llog_finish         = lov_llog_finish,
2762         .o_notify              = lov_notify,
2763         .o_pool_new            = lov_pool_new,
2764         .o_pool_rem            = lov_pool_remove,
2765         .o_pool_add            = lov_pool_add,
2766         .o_pool_del            = lov_pool_del,
2767         .o_getref              = lov_getref,
2768         .o_putref              = lov_putref,
2769 };
2770
2771 static quota_interface_t *quota_interface;
2772 extern quota_interface_t lov_quota_interface;
2773
2774 cfs_mem_cache_t *lov_oinfo_slab;
2775
2776 extern struct lu_kmem_descr lov_caches[];
2777
2778 int __init lov_init(void)
2779 {
2780         struct lprocfs_static_vars lvars = { 0 };
2781         int rc, rc2;
2782         ENTRY;
2783
2784         /* print an address of _any_ initialized kernel symbol from this
2785          * module, to allow debugging with gdb that doesn't support data
2786          * symbols from modules.*/
2787         CDEBUG(D_CONSOLE, "Lustre LOV module (%p).\n", &lov_caches);
2788
2789         rc = lu_kmem_init(lov_caches);
2790         if (rc)
2791                 return rc;
2792
2793         lov_oinfo_slab = cfs_mem_cache_create("lov_oinfo",
2794                                               sizeof(struct lov_oinfo),
2795                                               0, SLAB_HWCACHE_ALIGN);
2796         if (lov_oinfo_slab == NULL) {
2797                 lu_kmem_fini(lov_caches);
2798                 return -ENOMEM;
2799         }
2800         lprocfs_lov_init_vars(&lvars);
2801
2802         request_module("lquota");
2803         quota_interface = PORTAL_SYMBOL_GET(lov_quota_interface);
2804         init_obd_quota_ops(quota_interface, &lov_obd_ops);
2805
2806         rc = class_register_type(&lov_obd_ops, NULL, lvars.module_vars,
2807                                  LUSTRE_LOV_NAME, &lov_device_type);
2808
2809         if (rc) {
2810                 if (quota_interface)
2811                         PORTAL_SYMBOL_PUT(lov_quota_interface);
2812                 rc2 = cfs_mem_cache_destroy(lov_oinfo_slab);
2813                 LASSERT(rc2 == 0);
2814                 lu_kmem_fini(lov_caches);
2815         }
2816
2817         RETURN(rc);
2818 }
2819
2820 #ifdef __KERNEL__
2821 static void /*__exit*/ lov_exit(void)
2822 {
2823         int rc;
2824
2825         lu_device_type_fini(&lov_device_type);
2826         lu_kmem_fini(lov_caches);
2827
2828         if (quota_interface)
2829                 PORTAL_SYMBOL_PUT(lov_quota_interface);
2830
2831         class_unregister_type(LUSTRE_LOV_NAME);
2832         rc = cfs_mem_cache_destroy(lov_oinfo_slab);
2833         LASSERT(rc == 0);
2834 }
2835
2836 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2837 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
2838 MODULE_LICENSE("GPL");
2839
2840 cfs_module(lov, LUSTRE_VERSION_STRING, lov_init, lov_exit);
2841 #endif