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         cfs_mutex_down(&lov->lov_lock);
  79         cfs_atomic_inc(&lov->lov_refcount);
  80         cfs_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         cfs_mutex_down(&lov->lov_lock);
  91         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  92         if (cfs_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                         cfs_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                 cfs_mutex_up(&lov->lov_lock);
 112
 113                 cfs_list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 114                         cfs_list_del(&tgt->ltd_kill);
 115                         /* Disconnect */
 116                         __lov_del_obd(obd, tgt);
 117                 }
 118         } else {
 119                 cfs_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 #ifdef __KERNEL__
 139         cfs_proc_dir_entry_t *lov_proc_dir;
 140 #endif
 141         int rc;
 142         ENTRY;
 143
 144         if (!lov->lov_tgts[index])
 145                 RETURN(-EINVAL);
 146
 147         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 148         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 149
 150         if (!tgt_obd->obd_set_up) {
 151                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 152                 RETURN(-EINVAL);
 153         }
 154
 155         /* override the sp_me from lov */
 156         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 157
 158         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 159                 data->ocd_index = index;
 160
 161         /*
 162          * Divine LOV knows that OBDs under it are OSCs.
 163          */
 164         imp = tgt_obd->u.cli.cl_import;
 165
 166         if (activate) {
 167                 tgt_obd->obd_no_recov = 0;
 168                 /* FIXME this is probably supposed to be
 169                    ptlrpc_set_import_active.  Horrible naming. */
 170                 ptlrpc_activate_import(imp);
 171         }
 172
 173         rc = obd_register_observer(tgt_obd, obd);
 174         if (rc) {
 175                 CERROR("Target %s register_observer error %d\n",
 176                        obd_uuid2str(tgt_uuid), rc);
 177                 RETURN(rc);
 178         }
 179
 180
 181         if (imp->imp_invalid) {
 182                 CERROR("not connecting OSC %s; administratively "
 183                        "disabled\n", obd_uuid2str(tgt_uuid));
 184                 RETURN(0);
 185         }
 186
 187         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 188                          &lov_osc_uuid, data, NULL);
 189         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 190                 CERROR("Target %s connect error %d\n",
 191                        obd_uuid2str(tgt_uuid), rc);
 192                 RETURN(-ENODEV);
 193         }
 194
 195         lov->lov_tgts[index]->ltd_reap = 0;
 196
 197         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 198                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 199
 200 #ifdef __KERNEL__
 201         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 202         if (lov_proc_dir) {
 203                 struct obd_device *osc_obd = lov->lov_tgts[index]->ltd_exp->exp_obd;
 204                 cfs_proc_dir_entry_t *osc_symlink;
 205
 206                 LASSERT(osc_obd != NULL);
 207                 LASSERT(osc_obd->obd_magic == OBD_DEVICE_MAGIC);
 208                 LASSERT(osc_obd->obd_type->typ_name != NULL);
 209
 210                 osc_symlink = lprocfs_add_symlink(osc_obd->obd_name,
 211                                                   lov_proc_dir,
 212                                                   "../../../%s/%s",
 213                                                   osc_obd->obd_type->typ_name,
 214                                                   osc_obd->obd_name);
 215                 if (osc_symlink == NULL) {
 216                         CERROR("could not register LOV target "
 217                                 "/proc/fs/lustre/%s/%s/target_obds/%s.",
 218                                 obd->obd_type->typ_name, obd->obd_name,
 219                                 osc_obd->obd_name);
 220                         lprocfs_remove(&lov_proc_dir);
 221                 }
 222         }
 223 #endif
 224
 225         rc = qos_add_tgt(obd, index);
 226         if (rc)
 227                 CERROR("qos_add_tgt failed %d\n", rc);
 228
 229         RETURN(0);
 230 }
 231
 232 static int lov_connect(const struct lu_env *env,
 233                        struct obd_export **exp, struct obd_device *obd,
 234                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 235                        void *localdata)
 236 {
 237         struct lov_obd *lov = &obd->u.lov;
 238         struct lov_tgt_desc *tgt;
 239         struct lustre_handle conn;
 240         int i, rc;
 241         ENTRY;
 242
 243         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 244
 245         rc = class_connect(&conn, obd, cluuid);
 246         if (rc)
 247                 RETURN(rc);
 248
 249         *exp = class_conn2export(&conn);
 250
 251         /* Why should there ever be more than 1 connect? */
 252         lov->lov_connects++;
 253         LASSERT(lov->lov_connects == 1);
 254
 255         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 256         if (data)
 257                 lov->lov_ocd = *data;
 258
 259         obd_getref(obd);
 260         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 261                 tgt = lov->lov_tgts[i];
 262                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 263                         continue;
 264                 /* Flags will be lowest common denominator */
 265                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 266                 if (rc) {
 267                         CERROR("%s: lov connect tgt %d failed: %d\n",
 268                                obd->obd_name, i, rc);
 269                         continue;
 270                 }
 271                 /* connect to administrative disabled ost */
 272                 if (!lov->lov_tgts[i]->ltd_exp)
 273                         continue;
 274
 275                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 276                                 OBD_NOTIFY_CONNECT, (void *)&i);
 277                 if (rc) {
 278                         CERROR("%s error sending notify %d\n",
 279                                obd->obd_name, rc);
 280                 }
 281         }
 282         obd_putref(obd);
 283
 284         RETURN(0);
 285 }
 286
 287 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 288 {
 289         cfs_proc_dir_entry_t *lov_proc_dir;
 290         struct lov_obd *lov = &obd->u.lov;
 291         struct obd_device *osc_obd;
 292         int rc;
 293         ENTRY;
 294
 295         osc_obd = class_exp2obd(tgt->ltd_exp);
 296         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 297                obd->obd_name, osc_obd->obd_name);
 298
 299         if (tgt->ltd_active) {
 300                 tgt->ltd_active = 0;
 301                 lov->desc.ld_active_tgt_count--;
 302                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 303         }
 304
 305         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 306         if (lov_proc_dir) {
 307                 cfs_proc_dir_entry_t *osc_symlink;
 308
 309                 osc_symlink = lprocfs_srch(lov_proc_dir, osc_obd->obd_name);
 310                 if (osc_symlink) {
 311                         lprocfs_remove(&osc_symlink);
 312                 } else {
 313                         CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing.",
 314                                obd->obd_type->typ_name, obd->obd_name,
 315                                osc_obd->obd_name);
 316                 }
 317         }
 318
 319         if (osc_obd) {
 320                 /* Pass it on to our clients.
 321                  * XXX This should be an argument to disconnect,
 322                  * XXX not a back-door flag on the OBD.  Ah well.
 323                  */
 324                 osc_obd->obd_force = obd->obd_force;
 325                 osc_obd->obd_fail = obd->obd_fail;
 326                 osc_obd->obd_no_recov = obd->obd_no_recov;
 327         }
 328
 329         obd_register_observer(osc_obd, NULL);
 330
 331         rc = obd_disconnect(tgt->ltd_exp);
 332         if (rc) {
 333                 CERROR("Target %s disconnect error %d\n",
 334                        tgt->ltd_uuid.uuid, rc);
 335                 rc = 0;
 336         }
 337
 338         qos_del_tgt(obd, tgt);
 339
 340         tgt->ltd_exp = NULL;
 341         RETURN(0);
 342 }
 343
 344 static int lov_disconnect(struct obd_export *exp)
 345 {
 346         struct obd_device *obd = class_exp2obd(exp);
 347         struct lov_obd *lov = &obd->u.lov;
 348         int i, rc;
 349         ENTRY;
 350
 351         if (!lov->lov_tgts)
 352                 goto out;
 353
 354         /* Only disconnect the underlying layers on the final disconnect. */
 355         lov->lov_connects--;
 356         if (lov->lov_connects != 0) {
 357                 /* why should there be more than 1 connect? */
 358                 CERROR("disconnect #%d\n", lov->lov_connects);
 359                 goto out;
 360         }
 361
 362         /* Let's hold another reference so lov_del_obd doesn't spin through
 363            putref every time */
 364         obd_getref(obd);
 365
 366         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 367                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 368                         /* Disconnection is the last we know about an obd */
 369                         lov_del_target(obd, i, 0, lov->lov_tgts[i]->ltd_gen);
 370                 }
 371         }
 372         obd_putref(obd);
 373
 374 out:
 375         rc = class_disconnect(exp); /* bz 9811 */
 376         RETURN(rc);
 377 }
 378
 379 /* Error codes:
 380  *
 381  *  -EINVAL  : UUID can't be found in the LOV's target list
 382  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 383  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 384  *  any >= 0 : is log target index
 385  */
 386 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 387                               int activate)
 388 {
 389         struct lov_obd *lov = &obd->u.lov;
 390         struct lov_tgt_desc *tgt;
 391         int index;
 392         ENTRY;
 393
 394         CDEBUG(D_INFO, "Searching in lov %p for uuid %s (activate=%d)\n",
 395                lov, uuid->uuid, activate);
 396
 397         obd_getref(obd);
 398         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 399                 tgt = lov->lov_tgts[index];
 400                 if (!tgt || !tgt->ltd_exp)
 401                         continue;
 402
 403                 CDEBUG(D_INFO, "lov idx %d is %s conn "LPX64"\n",
 404                        index, obd_uuid2str(&tgt->ltd_uuid),
 405                        tgt->ltd_exp->exp_handle.h_cookie);
 406                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 407                         break;
 408         }
 409
 410         if (index == lov->desc.ld_tgt_count)
 411                 GOTO(out, index = -EINVAL);
 412
 413         if (lov->lov_tgts[index]->ltd_active == activate) {
 414                 CDEBUG(D_INFO, "OSC %s already %sactive!\n", uuid->uuid,
 415                        activate ? "" : "in");
 416                 GOTO(out, index);
 417         }
 418
 419         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n", obd_uuid2str(uuid),
 420                activate ? "" : "in");
 421
 422         lov->lov_tgts[index]->ltd_active = activate;
 423
 424         if (activate) {
 425                 lov->desc.ld_active_tgt_count++;
 426                 lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 427         } else {
 428                 lov->desc.ld_active_tgt_count--;
 429                 lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 430         }
 431         /* remove any old qos penalty */
 432         lov->lov_tgts[index]->ltd_qos.ltq_penalty = 0;
 433
 434  out:
 435         obd_putref(obd);
 436         RETURN(index);
 437 }
 438
 439 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 440                       enum obd_notify_event ev, void *data)
 441 {
 442         int rc = 0;
 443         ENTRY;
 444
 445         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 446                 struct obd_uuid *uuid;
 447
 448                 LASSERT(watched);
 449
 450                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 451                         CERROR("unexpected notification of %s %s!\n",
 452                                watched->obd_type->typ_name,
 453                                watched->obd_name);
 454                         RETURN(-EINVAL);
 455                 }
 456                 uuid = &watched->u.cli.cl_target_uuid;
 457
 458                 /* Set OSC as active before notifying the observer, so the
 459                  * observer can use the OSC normally.
 460                  */
 461                 rc = lov_set_osc_active(obd, uuid, ev == OBD_NOTIFY_ACTIVE);
 462                 if (rc < 0) {
 463                         CERROR("%sactivation of %s failed: %d\n",
 464                                (ev == OBD_NOTIFY_ACTIVE) ? "" : "de",
 465                                obd_uuid2str(uuid), rc);
 466                         RETURN(rc);
 467                 }
 468                 /* active event should be pass lov target index as data */
 469                 data = &rc;
 470         }
 471
 472         /* Pass the notification up the chain. */
 473         if (watched) {
 474                 rc = obd_notify_observer(obd, watched, ev, data);
 475         } else {
 476                 /* NULL watched means all osc's in the lov (only for syncs) */
 477                 /* sync event should be send lov idx as data */
 478                 struct lov_obd *lov = &obd->u.lov;
 479                 struct obd_device *tgt_obd;
 480                 int i;
 481                 obd_getref(obd);
 482                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 483                         /* don't send sync event if target not
 484                          * connected/activated */
 485                         if (!lov->lov_tgts[i] ||
 486                             !lov->lov_tgts[i]->ltd_active)
 487                                  continue;
 488
 489                         if ((ev == OBD_NOTIFY_SYNC) ||
 490                             (ev == OBD_NOTIFY_SYNC_NONBLOCK))
 491                                 data = &i;
 492
 493                         tgt_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
 494
 495                         rc = obd_notify_observer(obd, tgt_obd, ev, data);
 496                         if (rc) {
 497                                 CERROR("%s: notify %s of %s failed %d\n",
 498                                        obd->obd_name,
 499                                        obd->obd_observer->obd_name,
 500                                        tgt_obd->obd_name, rc);
 501                                 break;
 502                         }
 503                 }
 504                 obd_putref(obd);
 505         }
 506
 507         RETURN(rc);
 508 }
 509
 510 int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 511                    __u32 index, int gen, int active)
 512 {
 513         struct lov_obd *lov = &obd->u.lov;
 514         struct lov_tgt_desc *tgt;
 515         struct obd_device *tgt_obd;
 516         int rc;
 517         ENTRY;
 518
 519         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 520                uuidp->uuid, index, gen, active);
 521
 522         if (gen <= 0) {
 523                 CERROR("request to add OBD %s with invalid generation: %d\n",
 524                        uuidp->uuid, gen);
 525                 RETURN(-EINVAL);
 526         }
 527
 528         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 529                                         &obd->obd_uuid);
 530         if (tgt_obd == NULL)
 531                 RETURN(-EINVAL);
 532
 533         cfs_mutex_down(&lov->lov_lock);
 534
 535         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 536                 tgt = lov->lov_tgts[index];
 537                 CERROR("UUID %s already assigned at LOV target index %d\n",
 538                        obd_uuid2str(&tgt->ltd_uuid), index);
 539                 cfs_mutex_up(&lov->lov_lock);
 540                 RETURN(-EEXIST);
 541         }
 542
 543         if (index >= lov->lov_tgt_size) {
 544                 /* We need to reallocate the lov target array. */
 545                 struct lov_tgt_desc **newtgts, **old = NULL;
 546                 __u32 newsize, oldsize = 0;
 547
 548                 newsize = max(lov->lov_tgt_size, (__u32)2);
 549                 while (newsize < index + 1)
 550                         newsize = newsize << 1;
 551                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 552                 if (newtgts == NULL) {
 553                         cfs_mutex_up(&lov->lov_lock);
 554                         RETURN(-ENOMEM);
 555                 }
 556
 557                 if (lov->lov_tgt_size) {
 558                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 559                                lov->lov_tgt_size);
 560                         old = lov->lov_tgts;
 561                         oldsize = lov->lov_tgt_size;
 562                 }
 563
 564                 lov->lov_tgts = newtgts;
 565                 lov->lov_tgt_size = newsize;
 566 #ifdef __KERNEL__
 567                 smp_rmb();
 568 #endif
 569                 if (old)
 570                         OBD_FREE(old, sizeof(*old) * oldsize);
 571
 572                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 573                        lov->lov_tgts, lov->lov_tgt_size);
 574         }
 575
 576         OBD_ALLOC_PTR(tgt);
 577         if (!tgt) {
 578                 cfs_mutex_up(&lov->lov_lock);
 579                 RETURN(-ENOMEM);
 580         }
 581
 582         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 583         if (rc) {
 584                 cfs_mutex_up(&lov->lov_lock);
 585                 OBD_FREE_PTR(tgt);
 586                 RETURN(rc);
 587         }
 588
 589         memset(tgt, 0, sizeof(*tgt));
 590         tgt->ltd_uuid = *uuidp;
 591         tgt->ltd_obd = tgt_obd;
 592         /* XXX - add a sanity check on the generation number. */
 593         tgt->ltd_gen = gen;
 594         tgt->ltd_index = index;
 595         tgt->ltd_activate = active;
 596         lov->lov_tgts[index] = tgt;
 597         if (index >= lov->desc.ld_tgt_count)
 598                 lov->desc.ld_tgt_count = index + 1;
 599
 600         cfs_mutex_up(&lov->lov_lock);
 601
 602         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 603                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 604
 605         if (lov->lov_connects == 0) {
 606                 /* lov_connect hasn't been called yet. We'll do the
 607                    lov_connect_obd on this target when that fn first runs,
 608                    because we don't know the connect flags yet. */
 609                 RETURN(0);
 610         }
 611
 612         obd_getref(obd);
 613
 614         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 615         if (rc)
 616                 GOTO(out, rc);
 617
 618         /* connect to administrative disabled ost */
 619         if (!tgt->ltd_exp)
 620                 GOTO(out, rc = 0);
 621
 622         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 623                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 624                         (void *)&index);
 625
 626 out:
 627         if (rc) {
 628                 CERROR("add failed (%d), deleting %s\n", rc,
 629                        obd_uuid2str(&tgt->ltd_uuid));
 630                 lov_del_target(obd, index, 0, 0);
 631         }
 632         obd_putref(obd);
 633         RETURN(rc);
 634 }
 635
 636 /* Schedule a target for deletion */
 637 int lov_del_target(struct obd_device *obd, __u32 index,
 638                    struct obd_uuid *uuidp, int gen)
 639 {
 640         struct lov_obd *lov = &obd->u.lov;
 641         int count = lov->desc.ld_tgt_count;
 642         int rc = 0;
 643         ENTRY;
 644
 645         if (index >= count) {
 646                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 647                        index, count);
 648                 RETURN(-EINVAL);
 649         }
 650
 651         obd_getref(obd);
 652
 653         if (!lov->lov_tgts[index]) {
 654                 CERROR("LOV target at index %d is not setup.\n", index);
 655                 GOTO(out, rc = -EINVAL);
 656         }
 657
 658         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 659                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 660                        lov_uuid2str(lov, index), index,
 661                        obd_uuid2str(uuidp));
 662                 GOTO(out, rc = -EINVAL);
 663         }
 664
 665         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 666                lov_uuid2str(lov, index), index,
 667                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 668                lov->lov_tgts[index]->ltd_active);
 669
 670         lov->lov_tgts[index]->ltd_reap = 1;
 671         lov->lov_death_row++;
 672         /* we really delete it from obd_putref */
 673 out:
 674         obd_putref(obd);
 675
 676         RETURN(rc);
 677 }
 678
 679 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 680 {
 681         struct obd_device *osc_obd;
 682
 683         LASSERT(tgt);
 684         LASSERT(tgt->ltd_reap);
 685
 686         osc_obd = class_exp2obd(tgt->ltd_exp);
 687
 688         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 689                tgt->ltd_uuid.uuid,
 690                osc_obd ? osc_obd->obd_name : "<no obd>");
 691
 692         if (tgt->ltd_exp)
 693                 lov_disconnect_obd(obd, tgt);
 694
 695         OBD_FREE_PTR(tgt);
 696
 697         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 698            do it ourselves. And we can't do it from lov_cleanup,
 699            because we just lost our only reference to it. */
 700         if (osc_obd)
 701                 class_manual_cleanup(osc_obd);
 702 }
 703
 704 void lov_fix_desc_stripe_size(__u64 *val)
 705 {
 706         if (*val < PTLRPC_MAX_BRW_SIZE) {
 707                 LCONSOLE_WARN("Increasing default stripe size to min %u\n",
 708                               PTLRPC_MAX_BRW_SIZE);
 709                 *val = PTLRPC_MAX_BRW_SIZE;
 710         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 711                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 712                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
 713                               "multiple of %u)\n",
 714                               *val, LOV_MIN_STRIPE_SIZE);
 715         }
 716 }
 717
 718 void lov_fix_desc_stripe_count(__u32 *val)
 719 {
 720         if (*val == 0)
 721                 *val = 1;
 722 }
 723
 724 void lov_fix_desc_pattern(__u32 *val)
 725 {
 726         /* from lov_setstripe */
 727         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 728                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 729                 *val = 0;
 730         }
 731 }
 732
 733 void lov_fix_desc_qos_maxage(__u32 *val)
 734 {
 735         /* fix qos_maxage */
 736         if (*val == 0)
 737                 *val = QOS_DEFAULT_MAXAGE;
 738 }
 739
 740 void lov_fix_desc(struct lov_desc *desc)
 741 {
 742         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 743         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 744         lov_fix_desc_pattern(&desc->ld_pattern);
 745         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 746 }
 747
 748 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 749 {
 750         struct lprocfs_static_vars lvars = { 0 };
 751         struct lov_desc *desc;
 752         struct lov_obd *lov = &obd->u.lov;
 753         int rc;
 754         ENTRY;
 755
 756         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 757                 CERROR("LOV setup requires a descriptor\n");
 758                 RETURN(-EINVAL);
 759         }
 760
 761         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 762
 763         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 764                 CERROR("descriptor size wrong: %d > %d\n",
 765                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 766                 RETURN(-EINVAL);
 767         }
 768
 769         if (desc->ld_magic != LOV_DESC_MAGIC) {
 770                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 771                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 772                                    obd->obd_name, desc);
 773                             lustre_swab_lov_desc(desc);
 774                 } else {
 775                         CERROR("%s: Bad lov desc magic: %#x\n",
 776                                obd->obd_name, desc->ld_magic);
 777                         RETURN(-EINVAL);
 778                 }
 779         }
 780
 781         lov_fix_desc(desc);
 782
 783         desc->ld_active_tgt_count = 0;
 784         lov->desc = *desc;
 785         lov->lov_tgt_size = 0;
 786
 787         cfs_sema_init(&lov->lov_lock, 1);
 788         cfs_atomic_set(&lov->lov_refcount, 0);
 789         CFS_INIT_LIST_HEAD(&lov->lov_qos.lq_oss_list);
 790         cfs_init_rwsem(&lov->lov_qos.lq_rw_sem);
 791         lov->lov_sp_me = LUSTRE_SP_CLI;
 792         lov->lov_qos.lq_dirty = 1;
 793         lov->lov_qos.lq_rr.lqr_dirty = 1;
 794         lov->lov_qos.lq_reset = 1;
 795         /* Default priority is toward free space balance */
 796         lov->lov_qos.lq_prio_free = 232;
 797         /* Default threshold for rr (roughly 17%) */
 798         lov->lov_qos.lq_threshold_rr = 43;
 799         /* Init statfs fields */
 800         OBD_ALLOC_PTR(lov->lov_qos.lq_statfs_data);
 801         if (NULL == lov->lov_qos.lq_statfs_data)
 802                 RETURN(-ENOMEM);
 803         cfs_waitq_init(&lov->lov_qos.lq_statfs_waitq);
 804
 805         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 806                                                    HASH_POOLS_MAX_BITS,
 807                                                    &pool_hash_operations, CFS_HASH_REHASH);
 808         CFS_INIT_LIST_HEAD(&lov->lov_pool_list);
 809         lov->lov_pool_count = 0;
 810         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 811         if (rc)
 812                 RETURN(rc);
 813         rc = lov_ost_pool_init(&lov->lov_qos.lq_rr.lqr_pool, 0);
 814         if (rc) {
 815                 lov_ost_pool_free(&lov->lov_packed);
 816                 RETURN(rc);
 817         }
 818
 819         lprocfs_lov_init_vars(&lvars);
 820         lprocfs_obd_setup(obd, lvars.obd_vars);
 821 #ifdef LPROCFS
 822         {
 823                 int rc;
 824
 825                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
 826                                         0444, &lov_proc_target_fops, obd);
 827                 if (rc)
 828                         CWARN("Error adding the target_obd file\n");
 829         }
 830 #endif
 831         lov->lov_pool_proc_entry = lprocfs_register("pools",
 832                                                     obd->obd_proc_entry,
 833                                                     NULL, NULL);
 834
 835         RETURN(0);
 836 }
 837
 838 static int lov_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 839 {
 840         int rc = 0;
 841         struct lov_obd *lov = &obd->u.lov;
 842
 843         ENTRY;
 844
 845         switch (stage) {
 846         case OBD_CLEANUP_EARLY: {
 847                 int i;
 848                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 849                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_active)
 850                                 continue;
 851                         obd_precleanup(class_exp2obd(lov->lov_tgts[i]->ltd_exp),
 852                                        OBD_CLEANUP_EARLY);
 853                 }
 854                 break;
 855         }
 856         case OBD_CLEANUP_EXPORTS:
 857                 rc = obd_llog_finish(obd, 0);
 858                 if (rc != 0)
 859                         CERROR("failed to cleanup llogging subsystems\n");
 860                 break;
 861         }
 862         RETURN(rc);
 863 }
 864
 865 static int lov_cleanup(struct obd_device *obd)
 866 {
 867         struct lov_obd *lov = &obd->u.lov;
 868         cfs_list_t *pos, *tmp;
 869         struct pool_desc *pool;
 870
 871         cfs_list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 872                 pool = cfs_list_entry(pos, struct pool_desc, pool_list);
 873                 /* free pool structs */
 874                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 875                 lov_pool_del(obd, pool->pool_name);
 876         }
 877         cfs_hash_destroy(lov->lov_pools_hash_body);
 878         lov_ost_pool_free(&(lov->lov_qos.lq_rr.lqr_pool));
 879         lov_ost_pool_free(&lov->lov_packed);
 880
 881         if (lov->lov_tgts) {
 882                 int i;
 883                 obd_getref(obd);
 884                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 885                         if (!lov->lov_tgts[i])
 886                                 continue;
 887
 888                         /* Inactive targets may never have connected */
 889                         if (lov->lov_tgts[i]->ltd_active ||
 890                             cfs_atomic_read(&lov->lov_refcount))
 891                             /* We should never get here - these
 892                                should have been removed in the
 893                              disconnect. */
 894                                 CERROR("lov tgt %d not cleaned!"
 895                                        " deathrow=%d, lovrc=%d\n",
 896                                        i, lov->lov_death_row,
 897                                        cfs_atomic_read(&lov->lov_refcount));
 898                         lov_del_target(obd, i, 0, 0);
 899                 }
 900                 obd_putref(obd);
 901                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 902                          lov->lov_tgt_size);
 903                 lov->lov_tgt_size = 0;
 904         }
 905
 906         /* clear pools parent proc entry only after all pools is killed */
 907         lprocfs_obd_cleanup(obd);
 908
 909         OBD_FREE_PTR(lov->lov_qos.lq_statfs_data);
 910         RETURN(0);
 911 }
 912
 913 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 914                             __u32 *indexp, int *genp)
 915 {
 916         struct obd_uuid obd_uuid;
 917         int cmd;
 918         int rc = 0;
 919         ENTRY;
 920
 921         switch(cmd = lcfg->lcfg_command) {
 922         case LCFG_LOV_ADD_OBD:
 923         case LCFG_LOV_ADD_INA:
 924         case LCFG_LOV_DEL_OBD: {
 925                 __u32 index;
 926                 int gen;
 927                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 928                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
 929                         GOTO(out, rc = -EINVAL);
 930
 931                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 932
 933                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", indexp) != 1)
 934                         GOTO(out, rc = -EINVAL);
 935                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1)
 936                         GOTO(out, rc = -EINVAL);
 937                 index = *indexp;
 938                 gen = *genp;
 939                 if (cmd == LCFG_LOV_ADD_OBD)
 940                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 941                 else if (cmd == LCFG_LOV_ADD_INA)
 942                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 943                 else
 944                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 945                 GOTO(out, rc);
 946         }
 947         case LCFG_PARAM: {
 948                 struct lprocfs_static_vars lvars = { 0 };
 949                 struct lov_desc *desc = &(obd->u.lov.desc);
 950
 951                 if (!desc)
 952                         GOTO(out, rc = -EINVAL);
 953
 954                 lprocfs_lov_init_vars(&lvars);
 955
 956                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 957                                               lcfg, obd);
 958                 if (rc > 0)
 959                         rc = 0;
 960                 GOTO(out, rc);
 961         }
 962         case LCFG_POOL_NEW:
 963         case LCFG_POOL_ADD:
 964         case LCFG_POOL_DEL:
 965         case LCFG_POOL_REM:
 966                 GOTO(out, rc);
 967
 968         default: {
 969                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 970                 GOTO(out, rc = -EINVAL);
 971
 972         }
 973         }
 974 out:
 975         RETURN(rc);
 976 }
 977
 978 #ifndef log2
 979 #define log2(n) cfs_ffz(~(n))
 980 #endif
 981
 982 static int lov_clear_orphans(struct obd_export *export, struct obdo *src_oa,
 983                              struct lov_stripe_md **ea,
 984                              struct obd_trans_info *oti)
 985 {
 986         struct lov_obd *lov;
 987         struct obdo *tmp_oa;
 988         struct obd_uuid *ost_uuid = NULL;
 989         int rc = 0, i;
 990         ENTRY;
 991
 992         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 993                 src_oa->o_flags == OBD_FL_DELORPHAN);
 994
 995         lov = &export->exp_obd->u.lov;
 996
 997         OBDO_ALLOC(tmp_oa);
 998         if (tmp_oa == NULL)
 999                 RETURN(-ENOMEM);
1000
1001         if (oti->oti_ost_uuid) {
1002                 ost_uuid = oti->oti_ost_uuid;
1003                 CDEBUG(D_HA, "clearing orphans only for %s\n",
1004                        ost_uuid->uuid);
1005         }
1006
1007         obd_getref(export->exp_obd);
1008         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1009                 struct lov_stripe_md obj_md;
1010                 struct lov_stripe_md *obj_mdp = &obj_md;
1011                 struct lov_tgt_desc *tgt;
1012                 int err;
1013
1014                 tgt = lov->lov_tgts[i];
1015                 if (!tgt)
1016                         continue;
1017
1018                 /* if called for a specific target, we don't
1019                    care if it is not active. */
1020                 if (!lov->lov_tgts[i]->ltd_active && ost_uuid == NULL) {
1021                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
1022                         continue;
1023                 }
1024
1025                 if (ost_uuid && !obd_uuid_equals(ost_uuid, &tgt->ltd_uuid))
1026                         continue;
1027
1028                 CDEBUG(D_CONFIG,"Clear orphans for %d:%s\n", i,
1029                        obd_uuid2str(ost_uuid));
1030
1031                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
1032
1033                 LASSERT(lov->lov_tgts[i]->ltd_exp);
1034                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
1035                 err = obd_create(lov->lov_tgts[i]->ltd_exp,
1036                                  tmp_oa, &obj_mdp, oti);
1037                 if (err) {
1038                         /* This export will be disabled until it is recovered,
1039                            and then orphan recovery will be completed. */
1040                         CERROR("error in orphan recovery on OST idx %d/%d: "
1041                                "rc = %d\n", i, lov->desc.ld_tgt_count, err);
1042                         rc = err;
1043                 }
1044
1045                 if (ost_uuid)
1046                         break;
1047         }
1048         obd_putref(export->exp_obd);
1049
1050         OBDO_FREE(tmp_oa);
1051         RETURN(rc);
1052 }
1053
1054 static int lov_recreate(struct obd_export *exp, struct obdo *src_oa,
1055                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
1056 {
1057         struct lov_stripe_md *obj_mdp, *lsm;
1058         struct lov_obd *lov = &exp->exp_obd->u.lov;
1059         unsigned ost_idx;
1060         int rc, i;
1061         ENTRY;
1062
1063         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
1064                 src_oa->o_flags & OBD_FL_RECREATE_OBJS);
1065
1066         OBD_ALLOC(obj_mdp, sizeof(*obj_mdp));
1067         if (obj_mdp == NULL)
1068                 RETURN(-ENOMEM);
1069
1070         ost_idx = src_oa->o_nlink;
1071         lsm = *ea;
1072         if (lsm == NULL)
1073                 GOTO(out, rc = -EINVAL);
1074         if (ost_idx >= lov->desc.ld_tgt_count ||
1075             !lov->lov_tgts[ost_idx])
1076                 GOTO(out, rc = -EINVAL);
1077
1078         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1079                 if (lsm->lsm_oinfo[i]->loi_ost_idx == ost_idx) {
1080                         if (lsm->lsm_oinfo[i]->loi_id != src_oa->o_id)
1081                                 GOTO(out, rc = -EINVAL);
1082                         break;
1083                 }
1084         }
1085         if (i == lsm->lsm_stripe_count)
1086                 GOTO(out, rc = -EINVAL);
1087
1088         rc = obd_create(lov->lov_tgts[ost_idx]->ltd_exp, src_oa, &obj_mdp, oti);
1089 out:
1090         OBD_FREE(obj_mdp, sizeof(*obj_mdp));
1091         RETURN(rc);
1092 }
1093
1094 /* the LOV expects oa->o_id to be set to the LOV object id */
1095 static int lov_create(struct obd_export *exp, struct obdo *src_oa,
1096                       struct lov_stripe_md **ea, struct obd_trans_info *oti)
1097 {
1098         struct lov_obd *lov;
1099         struct obd_info oinfo;
1100         struct lov_request_set *set = NULL;
1101         struct lov_request *req;
1102         struct l_wait_info  lwi = { 0 };
1103         int rc = 0;
1104         ENTRY;
1105
1106         LASSERT(ea != NULL);
1107         if (exp == NULL)
1108                 RETURN(-EINVAL);
1109
1110         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1111             src_oa->o_flags == OBD_FL_DELORPHAN) {
1112                 rc = lov_clear_orphans(exp, src_oa, ea, oti);
1113                 RETURN(rc);
1114         }
1115
1116         lov = &exp->exp_obd->u.lov;
1117         if (!lov->desc.ld_active_tgt_count)
1118                 RETURN(-EIO);
1119
1120         obd_getref(exp->exp_obd);
1121         /* Recreate a specific object id at the given OST index */
1122         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1123             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
1124                  rc = lov_recreate(exp, src_oa, ea, oti);
1125                  GOTO(out, rc);
1126         }
1127
1128         /* issue statfs rpcs if the osfs data is older than qos_maxage - 1s,
1129          * later in alloc_qos(), we will wait for those rpcs to complete if
1130          * the osfs age is older than 2 * qos_maxage */
1131         qos_statfs_update(exp->exp_obd,
1132                           cfs_time_shift_64(-lov->desc.ld_qos_maxage) + CFS_HZ,
1133                           0);
1134
1135         rc = lov_prep_create_set(exp, &oinfo, ea, src_oa, oti, &set);
1136         if (rc)
1137                 GOTO(out, rc);
1138
1139         cfs_list_for_each_entry(req, &set->set_list, rq_link) {
1140                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
1141                 rc = obd_create_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1142                                       &req->rq_oi, &req->rq_oi.oi_md, oti);
1143         }
1144
1145         /* osc_create have timeout equ obd_timeout/2 so waiting don't be
1146          * longer then this */
1147         l_wait_event(set->set_waitq, lov_finished_set(set), &lwi);
1148
1149         /* we not have ptlrpc set for assign set->interpret and should
1150          * be call interpret function himself. calling from cb_create_update
1151          * not permited because lov_fini_create_set can sleep for long time,
1152          * but we must avoid sleeping in ptlrpcd interpret function. */
1153         rc = lov_fini_create_set(set, ea);
1154 out:
1155         obd_putref(exp->exp_obd);
1156         RETURN(rc);
1157 }
1158
1159 #define ASSERT_LSM_MAGIC(lsmp)                                                  \
1160 do {                                                                            \
1161         LASSERT((lsmp) != NULL);                                                \
1162         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                          \
1163                  (lsmp)->lsm_magic == LOV_MAGIC_V3),                            \
1164                  "%p->lsm_magic=%x\n", (lsmp), (lsmp)->lsm_magic);              \
1165 } while (0)
1166
1167 static int lov_destroy(struct obd_export *exp, struct obdo *oa,
1168                        struct lov_stripe_md *lsm, struct obd_trans_info *oti,
1169                        struct obd_export *md_exp, void *capa)
1170 {
1171         struct lov_request_set *set;
1172         struct obd_info oinfo;
1173         struct lov_request *req;
1174         cfs_list_t *pos;
1175         struct lov_obd *lov;
1176         int rc = 0, err = 0;
1177         ENTRY;
1178
1179         ASSERT_LSM_MAGIC(lsm);
1180
1181         if (!exp || !exp->exp_obd)
1182                 RETURN(-ENODEV);
1183
1184         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1185                 LASSERT(oti);
1186                 LASSERT(oti->oti_logcookies);
1187         }
1188
1189         lov = &exp->exp_obd->u.lov;
1190         obd_getref(exp->exp_obd);
1191         rc = lov_prep_destroy_set(exp, &oinfo, oa, lsm, oti, &set);
1192         if (rc)
1193                 GOTO(out, rc);
1194
1195         cfs_list_for_each (pos, &set->set_list) {
1196                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1197
1198                 if (oa->o_valid & OBD_MD_FLCOOKIE)
1199                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1200
1201                 err = obd_destroy(lov->lov_tgts[req->rq_idx]->ltd_exp,
1202                                   req->rq_oi.oi_oa, NULL, oti, NULL, capa);
1203                 err = lov_update_common_set(set, req, err);
1204                 if (err) {
1205                         CERROR("error: destroying objid "LPX64" subobj "
1206                                LPX64" on OST idx %d: rc = %d\n",
1207                                oa->o_id, req->rq_oi.oi_oa->o_id,
1208                                req->rq_idx, err);
1209                         if (!rc)
1210                                 rc = err;
1211                 }
1212         }
1213
1214         if (rc == 0) {
1215                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
1216                 rc = lsm_op_find(lsm->lsm_magic)->lsm_destroy(lsm, oa, md_exp);
1217         }
1218         err = lov_fini_destroy_set(set);
1219 out:
1220         obd_putref(exp->exp_obd);
1221         RETURN(rc ? rc : err);
1222 }
1223
1224 static int lov_getattr(struct obd_export *exp, struct obd_info *oinfo)
1225 {
1226         struct lov_request_set *set;
1227         struct lov_request *req;
1228         cfs_list_t *pos;
1229         struct lov_obd *lov;
1230         int err = 0, rc = 0;
1231         ENTRY;
1232
1233         LASSERT(oinfo);
1234         ASSERT_LSM_MAGIC(oinfo->oi_md);
1235
1236         if (!exp || !exp->exp_obd)
1237                 RETURN(-ENODEV);
1238
1239         lov = &exp->exp_obd->u.lov;
1240
1241         rc = lov_prep_getattr_set(exp, oinfo, &set);
1242         if (rc)
1243                 RETURN(rc);
1244
1245         cfs_list_for_each (pos, &set->set_list) {
1246                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1247
1248                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1249                        "%u\n", oinfo->oi_oa->o_id, req->rq_stripe,
1250                        req->rq_oi.oi_oa->o_id, req->rq_idx);
1251
1252                 rc = obd_getattr(lov->lov_tgts[req->rq_idx]->ltd_exp,
1253                                  &req->rq_oi);
1254                 err = lov_update_common_set(set, req, rc);
1255                 if (err) {
1256                         CERROR("error: getattr objid "LPX64" subobj "
1257                                LPX64" on OST idx %d: rc = %d\n",
1258                                oinfo->oi_oa->o_id, req->rq_oi.oi_oa->o_id,
1259                                req->rq_idx, err);
1260                         break;
1261                 }
1262         }
1263
1264         rc = lov_fini_getattr_set(set);
1265         if (err)
1266                 rc = err;
1267         RETURN(rc);
1268 }
1269
1270 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset,
1271                                  void *data, int rc)
1272 {
1273         struct lov_request_set *lovset = (struct lov_request_set *)data;
1274         int err;
1275         ENTRY;
1276
1277         /* don't do attribute merge if this aysnc op failed */
1278         if (rc)
1279                 lovset->set_completes = 0;
1280         err = lov_fini_getattr_set(lovset);
1281         RETURN(rc ? rc : err);
1282 }
1283
1284 static int lov_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
1285                               struct ptlrpc_request_set *rqset)
1286 {
1287         struct lov_request_set *lovset;
1288         struct lov_obd *lov;
1289         cfs_list_t *pos;
1290         struct lov_request *req;
1291         int rc = 0, err;
1292         ENTRY;
1293
1294         LASSERT(oinfo);
1295         ASSERT_LSM_MAGIC(oinfo->oi_md);
1296
1297         if (!exp || !exp->exp_obd)
1298                 RETURN(-ENODEV);
1299
1300         lov = &exp->exp_obd->u.lov;
1301
1302         rc = lov_prep_getattr_set(exp, oinfo, &lovset);
1303         if (rc)
1304                 RETURN(rc);
1305
1306         CDEBUG(D_INFO, "objid "LPX64": %ux%u byte stripes\n",
1307                oinfo->oi_md->lsm_object_id, oinfo->oi_md->lsm_stripe_count,
1308                oinfo->oi_md->lsm_stripe_size);
1309
1310         cfs_list_for_each (pos, &lovset->set_list) {
1311                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1312
1313                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1314                        "%u\n", oinfo->oi_oa->o_id, req->rq_stripe,
1315                        req->rq_oi.oi_oa->o_id, req->rq_idx);
1316                 rc = obd_getattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1317                                        &req->rq_oi, rqset);
1318                 if (rc) {
1319                         CERROR("error: getattr objid "LPX64" subobj "
1320                                LPX64" on OST idx %d: rc = %d\n",
1321                                oinfo->oi_oa->o_id, req->rq_oi.oi_oa->o_id,
1322                                req->rq_idx, rc);
1323                         GOTO(out, rc);
1324                 }
1325         }
1326
1327         if (!cfs_list_empty(&rqset->set_requests)) {
1328                 LASSERT(rc == 0);
1329                 LASSERT (rqset->set_interpret == NULL);
1330                 rqset->set_interpret = lov_getattr_interpret;
1331                 rqset->set_arg = (void *)lovset;
1332                 RETURN(rc);
1333         }
1334 out:
1335         if (rc)
1336                 lovset->set_completes = 0;
1337         err = lov_fini_getattr_set(lovset);
1338         RETURN(rc ? rc : err);
1339 }
1340
1341 static int lov_setattr(struct obd_export *exp, struct obd_info *oinfo,
1342                        struct obd_trans_info *oti)
1343 {
1344         struct lov_request_set *set;
1345         struct lov_obd *lov;
1346         cfs_list_t *pos;
1347         struct lov_request *req;
1348         int err = 0, rc = 0;
1349         ENTRY;
1350
1351         LASSERT(oinfo);
1352         ASSERT_LSM_MAGIC(oinfo->oi_md);
1353
1354         if (!exp || !exp->exp_obd)
1355                 RETURN(-ENODEV);
1356
1357         /* for now, we only expect the following updates here */
1358         LASSERT(!(oinfo->oi_oa->o_valid & ~(OBD_MD_FLID | OBD_MD_FLTYPE |
1359                                             OBD_MD_FLMODE | OBD_MD_FLATIME |
1360                                             OBD_MD_FLMTIME | OBD_MD_FLCTIME |
1361                                             OBD_MD_FLFLAGS | OBD_MD_FLSIZE |
1362                                             OBD_MD_FLGROUP | OBD_MD_FLUID |
1363                                             OBD_MD_FLGID | OBD_MD_FLFID |
1364                                             OBD_MD_FLGENER)));
1365         lov = &exp->exp_obd->u.lov;
1366         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1367         if (rc)
1368                 RETURN(rc);
1369
1370         cfs_list_for_each (pos, &set->set_list) {
1371                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1372
1373                 rc = obd_setattr(lov->lov_tgts[req->rq_idx]->ltd_exp,
1374                                  &req->rq_oi, NULL);
1375                 err = lov_update_setattr_set(set, req, rc);
1376                 if (err) {
1377                         CERROR("error: setattr objid "LPX64" subobj "
1378                                LPX64" on OST idx %d: rc = %d\n",
1379                                set->set_oi->oi_oa->o_id,
1380                                req->rq_oi.oi_oa->o_id, req->rq_idx, err);
1381                         if (!rc)
1382                                 rc = err;
1383                 }
1384         }
1385         err = lov_fini_setattr_set(set);
1386         if (!rc)
1387                 rc = err;
1388         RETURN(rc);
1389 }
1390
1391 static int lov_setattr_interpret(struct ptlrpc_request_set *rqset,
1392                                  void *data, int rc)
1393 {
1394         struct lov_request_set *lovset = (struct lov_request_set *)data;
1395         int err;
1396         ENTRY;
1397
1398         if (rc)
1399                 lovset->set_completes = 0;
1400         err = lov_fini_setattr_set(lovset);
1401         RETURN(rc ? rc : err);
1402 }
1403
1404 /* If @oti is given, the request goes from MDS and responses from OSTs are not
1405    needed. Otherwise, a client is waiting for responses. */
1406 static int lov_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
1407                              struct obd_trans_info *oti,
1408                              struct ptlrpc_request_set *rqset)
1409 {
1410         struct lov_request_set *set;
1411         struct lov_request *req;
1412         cfs_list_t *pos;
1413         struct lov_obd *lov;
1414         int rc = 0;
1415         ENTRY;
1416
1417         LASSERT(oinfo);
1418         ASSERT_LSM_MAGIC(oinfo->oi_md);
1419         if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE) {
1420                 LASSERT(oti);
1421                 LASSERT(oti->oti_logcookies);
1422         }
1423
1424         if (!exp || !exp->exp_obd)
1425                 RETURN(-ENODEV);
1426
1427         lov = &exp->exp_obd->u.lov;
1428         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1429         if (rc)
1430                 RETURN(rc);
1431
1432         CDEBUG(D_INFO, "objid "LPX64": %ux%u byte stripes\n",
1433                oinfo->oi_md->lsm_object_id, oinfo->oi_md->lsm_stripe_count,
1434                oinfo->oi_md->lsm_stripe_size);
1435
1436         cfs_list_for_each (pos, &set->set_list) {
1437                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1438
1439                 if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
1440                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1441
1442                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1443                        "%u\n", oinfo->oi_oa->o_id, req->rq_stripe,
1444                        req->rq_oi.oi_oa->o_id, req->rq_idx);
1445
1446                 rc = obd_setattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1447                                        &req->rq_oi, oti, rqset);
1448                 if (rc) {
1449                         CERROR("error: setattr objid "LPX64" subobj "
1450                                LPX64" on OST idx %d: rc = %d\n",
1451                                set->set_oi->oi_oa->o_id,
1452                                req->rq_oi.oi_oa->o_id,
1453                                req->rq_idx, rc);
1454                         break;
1455                 }
1456         }
1457
1458         /* If we are not waiting for responses on async requests, return. */
1459         if (rc || !rqset || cfs_list_empty(&rqset->set_requests)) {
1460                 int err;
1461                 if (rc)
1462                         set->set_completes = 0;
1463                 err = lov_fini_setattr_set(set);
1464                 RETURN(rc ? rc : err);
1465         }
1466
1467         LASSERT(rqset->set_interpret == NULL);
1468         rqset->set_interpret = lov_setattr_interpret;
1469         rqset->set_arg = (void *)set;
1470
1471         RETURN(0);
1472 }
1473
1474 static int lov_punch_interpret(struct ptlrpc_request_set *rqset,
1475                                void *data, int rc)
1476 {
1477         struct lov_request_set *lovset = (struct lov_request_set *)data;
1478         int err;
1479         ENTRY;
1480
1481         if (rc)
1482                 lovset->set_completes = 0;
1483         err = lov_fini_punch_set(lovset);
1484         RETURN(rc ? rc : err);
1485 }
1486
1487 /* FIXME: maybe we'll just make one node the authoritative attribute node, then
1488  * we can send this 'punch' to just the authoritative node and the nodes
1489  * that the punch will affect. */
1490 static int lov_punch(struct obd_export *exp, struct obd_info *oinfo,
1491                      struct obd_trans_info *oti,
1492                      struct ptlrpc_request_set *rqset)
1493 {
1494         struct lov_request_set *set;
1495         struct lov_obd *lov;
1496         cfs_list_t *pos;
1497         struct lov_request *req;
1498         int rc = 0;
1499         ENTRY;
1500
1501         LASSERT(oinfo);
1502         ASSERT_LSM_MAGIC(oinfo->oi_md);
1503
1504         if (!exp || !exp->exp_obd)
1505                 RETURN(-ENODEV);
1506
1507         lov = &exp->exp_obd->u.lov;
1508         rc = lov_prep_punch_set(exp, oinfo, oti, &set);
1509         if (rc)
1510                 RETURN(rc);
1511
1512         cfs_list_for_each (pos, &set->set_list) {
1513                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1514
1515                 rc = obd_punch(lov->lov_tgts[req->rq_idx]->ltd_exp,
1516                                &req->rq_oi, NULL, rqset);
1517                 if (rc) {
1518                         CERROR("error: punch objid "LPX64" subobj "LPX64
1519                                " on OST idx %d: rc = %d\n",
1520                                set->set_oi->oi_oa->o_id,
1521                                req->rq_oi.oi_oa->o_id, req->rq_idx, rc);
1522                         break;
1523                 }
1524         }
1525
1526         if (rc || cfs_list_empty(&rqset->set_requests)) {
1527                 int err;
1528                 err = lov_fini_punch_set(set);
1529                 RETURN(rc ? rc : err);
1530         }
1531
1532         LASSERT(rqset->set_interpret == NULL);
1533         rqset->set_interpret = lov_punch_interpret;
1534         rqset->set_arg = (void *)set;
1535
1536         RETURN(0);
1537 }
1538
1539 static int lov_sync(struct obd_export *exp, struct obdo *oa,
1540                     struct lov_stripe_md *lsm, obd_off start, obd_off end,
1541                     void *capa)
1542 {
1543         struct lov_request_set *set;
1544         struct obd_info oinfo;
1545         struct lov_obd *lov;
1546         cfs_list_t *pos;
1547         struct lov_request *req;
1548         int err = 0, rc = 0;
1549         ENTRY;
1550
1551         ASSERT_LSM_MAGIC(lsm);
1552
1553         if (!exp->exp_obd)
1554                 RETURN(-ENODEV);
1555
1556         lov = &exp->exp_obd->u.lov;
1557         rc = lov_prep_sync_set(exp, &oinfo, oa, lsm, start, end, &set);
1558         if (rc)
1559                 RETURN(rc);
1560
1561         cfs_list_for_each (pos, &set->set_list) {
1562                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1563
1564                 rc = obd_sync(lov->lov_tgts[req->rq_idx]->ltd_exp,
1565                               req->rq_oi.oi_oa, NULL,
1566                               req->rq_oi.oi_policy.l_extent.start,
1567                               req->rq_oi.oi_policy.l_extent.end, capa);
1568                 err = lov_update_common_set(set, req, rc);
1569                 if (err) {
1570                         CERROR("error: fsync objid "LPX64" subobj "LPX64
1571                                " on OST idx %d: rc = %d\n",
1572                                set->set_oi->oi_oa->o_id,
1573                                req->rq_oi.oi_oa->o_id, req->rq_idx, rc);
1574                         if (!rc)
1575                                 rc = err;
1576                 }
1577         }
1578         err = lov_fini_sync_set(set);
1579         if (!rc)
1580                 rc = err;
1581         RETURN(rc);
1582 }
1583
1584 static int lov_brw_check(struct lov_obd *lov, struct obd_info *lov_oinfo,
1585                          obd_count oa_bufs, struct brw_page *pga)
1586 {
1587         struct obd_info oinfo = { { { 0 } } };
1588         int i, rc = 0;
1589
1590         oinfo.oi_oa = lov_oinfo->oi_oa;
1591
1592         /* The caller just wants to know if there's a chance that this
1593          * I/O can succeed */
1594         for (i = 0; i < oa_bufs; i++) {
1595                 int stripe = lov_stripe_number(lov_oinfo->oi_md, pga[i].off);
1596                 int ost = lov_oinfo->oi_md->lsm_oinfo[stripe]->loi_ost_idx;
1597                 obd_off start, end;
1598
1599                 if (!lov_stripe_intersects(lov_oinfo->oi_md, i, pga[i].off,
1600                                            pga[i].off + pga[i].count - 1,
1601                                            &start, &end))
1602                         continue;
1603
1604                 if (!lov->lov_tgts[ost] || !lov->lov_tgts[ost]->ltd_active) {
1605                         CDEBUG(D_HA, "lov idx %d inactive\n", ost);
1606                         return -EIO;
1607                 }
1608
1609                 rc = obd_brw(OBD_BRW_CHECK, lov->lov_tgts[ost]->ltd_exp, &oinfo,
1610                              1, &pga[i], NULL);
1611                 if (rc)
1612                         break;
1613         }
1614         return rc;
1615 }
1616
1617 static int lov_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1618                    obd_count oa_bufs, struct brw_page *pga,
1619                    struct obd_trans_info *oti)
1620 {
1621         struct lov_request_set *set;
1622         struct lov_request *req;
1623         cfs_list_t *pos;
1624         struct lov_obd *lov = &exp->exp_obd->u.lov;
1625         int err, rc = 0;
1626         ENTRY;
1627
1628         ASSERT_LSM_MAGIC(oinfo->oi_md);
1629
1630         if (cmd == OBD_BRW_CHECK) {
1631                 rc = lov_brw_check(lov, oinfo, oa_bufs, pga);
1632                 RETURN(rc);
1633         }
1634
1635         rc = lov_prep_brw_set(exp, oinfo, oa_bufs, pga, oti, &set);
1636         if (rc)
1637                 RETURN(rc);
1638
1639         cfs_list_for_each (pos, &set->set_list) {
1640                 struct obd_export *sub_exp;
1641                 struct brw_page *sub_pga;
1642                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1643
1644                 sub_exp = lov->lov_tgts[req->rq_idx]->ltd_exp;
1645                 sub_pga = set->set_pga + req->rq_pgaidx;
1646                 rc = obd_brw(cmd, sub_exp, &req->rq_oi, req->rq_oabufs,
1647                              sub_pga, oti);
1648                 if (rc)
1649                         break;
1650                 lov_update_common_set(set, req, rc);
1651         }
1652
1653         err = lov_fini_brw_set(set);
1654         if (!rc)
1655                 rc = err;
1656         RETURN(rc);
1657 }
1658
1659 static int lov_enqueue_interpret(struct ptlrpc_request_set *rqset,
1660                                  void *data, int rc)
1661 {
1662         struct lov_request_set *lovset = (struct lov_request_set *)data;
1663         ENTRY;
1664         rc = lov_fini_enqueue_set(lovset, lovset->set_ei->ei_mode, rc, rqset);
1665         RETURN(rc);
1666 }
1667
1668 static int lov_enqueue(struct obd_export *exp, struct obd_info *oinfo,
1669                        struct ldlm_enqueue_info *einfo,
1670                        struct ptlrpc_request_set *rqset)
1671 {
1672         ldlm_mode_t mode = einfo->ei_mode;
1673         struct lov_request_set *set;
1674         struct lov_request *req;
1675         cfs_list_t *pos;
1676         struct lov_obd *lov;
1677         ldlm_error_t rc;
1678         ENTRY;
1679
1680         LASSERT(oinfo);
1681         ASSERT_LSM_MAGIC(oinfo->oi_md);
1682         LASSERT(mode == (mode & -mode));
1683
1684         /* we should never be asked to replay a lock this way. */
1685         LASSERT((oinfo->oi_flags & LDLM_FL_REPLAY) == 0);
1686
1687         if (!exp || !exp->exp_obd)
1688                 RETURN(-ENODEV);
1689
1690         lov = &exp->exp_obd->u.lov;
1691         rc = lov_prep_enqueue_set(exp, oinfo, einfo, &set);
1692         if (rc)
1693                 RETURN(rc);
1694
1695         cfs_list_for_each (pos, &set->set_list) {
1696                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1697
1698                 rc = obd_enqueue(lov->lov_tgts[req->rq_idx]->ltd_exp,
1699                                  &req->rq_oi, einfo, rqset);
1700                 if (rc != ELDLM_OK)
1701                         GOTO(out, rc);
1702         }
1703
1704         if (rqset && !cfs_list_empty(&rqset->set_requests)) {
1705                 LASSERT(rc == 0);
1706                 LASSERT(rqset->set_interpret == NULL);
1707                 rqset->set_interpret = lov_enqueue_interpret;
1708                 rqset->set_arg = (void *)set;
1709                 RETURN(rc);
1710         }
1711 out:
1712         rc = lov_fini_enqueue_set(set, mode, rc, rqset);
1713         RETURN(rc);
1714 }
1715
1716 static int lov_change_cbdata(struct obd_export *exp,
1717                              struct lov_stripe_md *lsm, ldlm_iterator_t it,
1718                              void *data)
1719 {
1720         struct lov_obd *lov;
1721         int rc = 0, i;
1722         ENTRY;
1723
1724         ASSERT_LSM_MAGIC(lsm);
1725
1726         if (!exp || !exp->exp_obd)
1727                 RETURN(-ENODEV);
1728
1729         LASSERT_MDS_GROUP(lsm->lsm_object_gr);
1730
1731         lov = &exp->exp_obd->u.lov;
1732         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1733                 struct lov_stripe_md submd;
1734                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1735
1736                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1737                         CDEBUG(D_HA, "lov idx %d NULL \n", loi->loi_ost_idx);
1738                         continue;
1739                 }
1740
1741                 submd.lsm_object_id = loi->loi_id;
1742                 submd.lsm_object_gr = lsm->lsm_object_gr;
1743                 submd.lsm_stripe_count = 0;
1744                 rc = obd_change_cbdata(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1745                                        &submd, it, data);
1746         }
1747         RETURN(rc);
1748 }
1749
1750 static int lov_cancel(struct obd_export *exp, struct lov_stripe_md *lsm,
1751                       __u32 mode, struct lustre_handle *lockh)
1752 {
1753         struct lov_request_set *set;
1754         struct obd_info oinfo;
1755         struct lov_request *req;
1756         cfs_list_t *pos;
1757         struct lov_obd *lov;
1758         struct lustre_handle *lov_lockhp;
1759         int err = 0, rc = 0;
1760         ENTRY;
1761
1762         ASSERT_LSM_MAGIC(lsm);
1763
1764         if (!exp || !exp->exp_obd)
1765                 RETURN(-ENODEV);
1766
1767         LASSERT_MDS_GROUP(lsm->lsm_object_gr);
1768         LASSERT(lockh);
1769         lov = &exp->exp_obd->u.lov;
1770         rc = lov_prep_cancel_set(exp, &oinfo, lsm, mode, lockh, &set);
1771         if (rc)
1772                 RETURN(rc);
1773
1774         cfs_list_for_each (pos, &set->set_list) {
1775                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1776                 lov_lockhp = set->set_lockh->llh_handles + req->rq_stripe;
1777
1778                 rc = obd_cancel(lov->lov_tgts[req->rq_idx]->ltd_exp,
1779                                 req->rq_oi.oi_md, mode, lov_lockhp);
1780                 rc = lov_update_common_set(set, req, rc);
1781                 if (rc) {
1782                         CERROR("error: cancel objid "LPX64" subobj "
1783                                LPX64" on OST idx %d: rc = %d\n",
1784                                lsm->lsm_object_id,
1785                                req->rq_oi.oi_md->lsm_object_id,
1786                                req->rq_idx, rc);
1787                         err = rc;
1788                 }
1789
1790         }
1791         lov_fini_cancel_set(set);
1792         RETURN(err);
1793 }
1794
1795 static int lov_cancel_unused(struct obd_export *exp,
1796                              struct lov_stripe_md *lsm,
1797                              int flags, void *opaque)
1798 {
1799         struct lov_obd *lov;
1800         int rc = 0, i;
1801         ENTRY;
1802
1803         if (!exp || !exp->exp_obd)
1804                 RETURN(-ENODEV);
1805
1806         lov = &exp->exp_obd->u.lov;
1807         if (lsm == NULL) {
1808                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1809                         int err;
1810                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1811                                 continue;
1812
1813                         err = obd_cancel_unused(lov->lov_tgts[i]->ltd_exp, NULL,
1814                                                 flags, opaque);
1815                         if (!rc)
1816                                 rc = err;
1817                 }
1818                 RETURN(rc);
1819         }
1820
1821         ASSERT_LSM_MAGIC(lsm);
1822
1823         LASSERT_MDS_GROUP(lsm->lsm_object_gr);
1824         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1825                 struct lov_stripe_md submd;
1826                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1827                 int err;
1828
1829                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1830                         CDEBUG(D_HA, "lov idx %d NULL\n", loi->loi_ost_idx);
1831                         continue;
1832                 }
1833
1834                 if (!lov->lov_tgts[loi->loi_ost_idx]->ltd_active)
1835                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1836
1837                 submd.lsm_object_id = loi->loi_id;
1838                 submd.lsm_object_gr = lsm->lsm_object_gr;
1839                 submd.lsm_stripe_count = 0;
1840                 err = obd_cancel_unused(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1841                                         &submd, flags, opaque);
1842                 if (err && lov->lov_tgts[loi->loi_ost_idx]->ltd_active) {
1843                         CERROR("error: cancel unused objid "LPX64" subobj "LPX64
1844                                " on OST idx %d: rc = %d\n", lsm->lsm_object_id,
1845                                loi->loi_id, loi->loi_ost_idx, err);
1846                         if (!rc)
1847                                 rc = err;
1848                 }
1849         }
1850         RETURN(rc);
1851 }
1852
1853 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1854 {
1855         struct lov_request_set *lovset = (struct lov_request_set *)data;
1856         int err;
1857         ENTRY;
1858
1859         if (rc)
1860                 lovset->set_completes = 0;
1861
1862         err = lov_fini_statfs_set(lovset);
1863         RETURN(rc ? rc : err);
1864 }
1865
1866 static int lov_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
1867                             __u64 max_age, struct ptlrpc_request_set *rqset)
1868 {
1869         struct lov_request_set *set;
1870         struct lov_request *req;
1871         cfs_list_t *pos;
1872         struct lov_obd *lov;
1873         int rc = 0;
1874         ENTRY;
1875
1876         LASSERT(oinfo != NULL);
1877         LASSERT(oinfo->oi_osfs != NULL);
1878
1879         lov = &obd->u.lov;
1880         rc = lov_prep_statfs_set(obd, oinfo, &set);
1881         if (rc)
1882                 RETURN(rc);
1883
1884         cfs_list_for_each (pos, &set->set_list) {
1885                 struct obd_device *osc_obd;
1886
1887                 req = cfs_list_entry(pos, struct lov_request, rq_link);
1888
1889                 osc_obd = class_exp2obd(lov->lov_tgts[req->rq_idx]->ltd_exp);
1890                 rc = obd_statfs_async(osc_obd, &req->rq_oi, max_age, rqset);
1891                 if (rc)
1892                         break;
1893         }
1894
1895         if (rc || cfs_list_empty(&rqset->set_requests)) {
1896                 int err;
1897                 if (rc)
1898                         set->set_completes = 0;
1899                 err = lov_fini_statfs_set(set);
1900                 RETURN(rc ? rc : err);
1901         }
1902
1903         LASSERT(rqset->set_interpret == NULL);
1904         rqset->set_interpret = lov_statfs_interpret;
1905         rqset->set_arg = (void *)set;
1906         RETURN(0);
1907 }
1908
1909 static int lov_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1910                       __u64 max_age, __u32 flags)
1911 {
1912         struct ptlrpc_request_set *set = NULL;
1913         struct obd_info oinfo = { { { 0 } } };
1914         int rc = 0;
1915         ENTRY;
1916
1917
1918         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1919          * statfs requests */
1920         set = ptlrpc_prep_set();
1921         if (set == NULL)
1922                 RETURN(-ENOMEM);
1923
1924         oinfo.oi_osfs = osfs;
1925         oinfo.oi_flags = flags;
1926         rc = lov_statfs_async(obd, &oinfo, max_age, set);
1927         if (rc == 0)
1928                 rc = ptlrpc_set_wait(set);
1929         ptlrpc_set_destroy(set);
1930
1931         RETURN(rc);
1932 }
1933
1934 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1935                          void *karg, void *uarg)
1936 {
1937         struct obd_device *obddev = class_exp2obd(exp);
1938         struct lov_obd *lov = &obddev->u.lov;
1939         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1940         struct obd_uuid *uuidp;
1941         ENTRY;
1942
1943         switch (cmd) {
1944         case IOC_OBD_STATFS: {
1945                 struct obd_ioctl_data *data = karg;
1946                 struct obd_device *osc_obd;
1947                 struct obd_statfs stat_buf = {0};
1948                 __u32 index;
1949
1950                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1951                 if ((index >= count))
1952                         RETURN(-ENODEV);
1953
1954                 if (!lov->lov_tgts[index])
1955                         /* Try again with the next index */
1956                         RETURN(-EAGAIN);
1957                 if (!lov->lov_tgts[index]->ltd_active)
1958                         RETURN(-ENODATA);
1959
1960                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1961                 if (!osc_obd)
1962                         RETURN(-EINVAL);
1963
1964                 /* got statfs data */
1965                 rc = obd_statfs(osc_obd, &stat_buf,
1966                                 cfs_time_current_64() - CFS_HZ, 0);
1967                 if (rc)
1968                         RETURN(rc);
1969                 if (cfs_copy_to_user(data->ioc_pbuf1, &stat_buf,
1970                                      data->ioc_plen1))
1971                         RETURN(-EFAULT);
1972                 /* copy UUID */
1973                 if (cfs_copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1974                                      data->ioc_plen2))
1975                         RETURN(-EFAULT);
1976                 break;
1977         }
1978         case OBD_IOC_LOV_GET_CONFIG: {
1979                 struct obd_ioctl_data *data;
1980                 struct lov_desc *desc;
1981                 char *buf = NULL;
1982                 __u32 *genp;
1983
1984                 len = 0;
1985                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
1986                         RETURN(-EINVAL);
1987
1988                 data = (struct obd_ioctl_data *)buf;
1989
1990                 if (sizeof(*desc) > data->ioc_inllen1) {
1991                         obd_ioctl_freedata(buf, len);
1992                         RETURN(-EINVAL);
1993                 }
1994
1995                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1996                         obd_ioctl_freedata(buf, len);
1997                         RETURN(-EINVAL);
1998                 }
1999
2000                 if (sizeof(__u32) * count > data->ioc_inllen3) {
2001                         obd_ioctl_freedata(buf, len);
2002                         RETURN(-EINVAL);
2003                 }
2004
2005                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2006                 memcpy(desc, &(lov->desc), sizeof(*desc));
2007
2008                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
2009                 genp = (__u32 *)data->ioc_inlbuf3;
2010                 /* the uuid will be empty for deleted OSTs */
2011                 for (i = 0; i < count; i++, uuidp++, genp++) {
2012                         if (!lov->lov_tgts[i])
2013                                 continue;
2014                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
2015                         *genp = lov->lov_tgts[i]->ltd_gen;
2016                 }
2017
2018                 if (cfs_copy_to_user((void *)uarg, buf, len))
2019                         rc = -EFAULT;
2020                 obd_ioctl_freedata(buf, len);
2021                 break;
2022         }
2023         case LL_IOC_LOV_SETSTRIPE:
2024                 rc = lov_setstripe(exp, len, karg, uarg);
2025                 break;
2026         case LL_IOC_LOV_GETSTRIPE:
2027                 rc = lov_getstripe(exp, karg, uarg);
2028                 break;
2029         case LL_IOC_LOV_SETEA:
2030                 rc = lov_setea(exp, karg, uarg);
2031                 break;
2032         case OBD_IOC_QUOTACTL: {
2033                 struct if_quotactl *qctl = karg;
2034                 struct lov_tgt_desc *tgt = NULL;
2035                 struct obd_quotactl *oqctl;
2036
2037                 if (qctl->qc_valid == QC_OSTIDX) {
2038                         if (qctl->qc_idx < 0 || count <= qctl->qc_idx)
2039                                 RETURN(-EINVAL);
2040
2041                         tgt = lov->lov_tgts[qctl->qc_idx];
2042                         if (!tgt || !tgt->ltd_exp)
2043                                 RETURN(-EINVAL);
2044                 } else if (qctl->qc_valid == QC_UUID) {
2045                         for (i = 0; i < count; i++) {
2046                                 tgt = lov->lov_tgts[i];
2047                                 if (!tgt ||
2048                                     !obd_uuid_equals(&tgt->ltd_uuid,
2049                                                      &qctl->obd_uuid))
2050                                         continue;
2051
2052                                 if (tgt->ltd_exp == NULL)
2053                                         RETURN(-EINVAL);
2054
2055                                 break;
2056                         }
2057                 } else {
2058                         RETURN(-EINVAL);
2059                 }
2060
2061                 if (i >= count)
2062                         RETURN(-EAGAIN);
2063
2064                 LASSERT(tgt && tgt->ltd_exp);
2065                 OBD_ALLOC_PTR(oqctl);
2066                 if (!oqctl)
2067                         RETURN(-ENOMEM);
2068
2069                 QCTL_COPY(oqctl, qctl);
2070                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
2071                 if (rc == 0) {
2072                         QCTL_COPY(qctl, oqctl);
2073                         qctl->qc_valid = QC_OSTIDX;
2074                         qctl->obd_uuid = tgt->ltd_uuid;
2075                 }
2076                 OBD_FREE_PTR(oqctl);
2077                 break;
2078         }
2079         default: {
2080                 int set = 0;
2081
2082                 if (count == 0)
2083                         RETURN(-ENOTTY);
2084
2085                 for (i = 0; i < count; i++) {
2086                         int err;
2087
2088                         /* OST was disconnected */
2089                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
2090                                 continue;
2091
2092                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
2093                                             len, karg, uarg);
2094                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
2095                                 RETURN(err);
2096                         } else if (err) {
2097                                 if (lov->lov_tgts[i]->ltd_active) {
2098                                         CDEBUG(err == -ENOTTY ?
2099                                                D_IOCTL : D_WARNING,
2100                                                "iocontrol OSC %s on OST "
2101                                                "idx %d cmd %x: err = %d\n",
2102                                                lov_uuid2str(lov, i),
2103                                                i, cmd, err);
2104                                         if (!rc)
2105                                                 rc = err;
2106                                 }
2107                         } else {
2108                                 set = 1;
2109                         }
2110                 }
2111                 if (!set && !rc)
2112                         rc = -EIO;
2113         }
2114         }
2115
2116         RETURN(rc);
2117 }
2118
2119 #define FIEMAP_BUFFER_SIZE 4096
2120
2121 /**
2122  * Non-zero fe_logical indicates that this is a continuation FIEMAP
2123  * call. The local end offset and the device are sent in the first
2124  * fm_extent. This function calculates the stripe number from the index.
2125  * This function returns a stripe_no on which mapping is to be restarted.
2126  *
2127  * This function returns fm_end_offset which is the in-OST offset at which
2128  * mapping should be restarted. If fm_end_offset=0 is returned then caller
2129  * will re-calculate proper offset in next stripe.
2130  * Note that the first extent is passed to lov_get_info via the value field.
2131  *
2132  * \param fiemap fiemap request header
2133  * \param lsm striping information for the file
2134  * \param fm_start logical start of mapping
2135  * \param fm_end logical end of mapping
2136  * \param start_stripe starting stripe will be returned in this
2137  */
2138 obd_size fiemap_calc_fm_end_offset(struct ll_user_fiemap *fiemap,
2139                                    struct lov_stripe_md *lsm, obd_size fm_start,
2140                                    obd_size fm_end, int *start_stripe)
2141 {
2142         obd_size local_end = fiemap->fm_extents[0].fe_logical;
2143         obd_off lun_start, lun_end;
2144         obd_size fm_end_offset;
2145         int stripe_no = -1, i;
2146
2147         if (fiemap->fm_extent_count == 0 ||
2148             fiemap->fm_extents[0].fe_logical == 0)
2149                 return 0;
2150
2151         /* Find out stripe_no from ost_index saved in the fe_device */
2152         for (i = 0; i < lsm->lsm_stripe_count; i++) {
2153                 if (lsm->lsm_oinfo[i]->loi_ost_idx ==
2154                                         fiemap->fm_extents[0].fe_device) {
2155                         stripe_no = i;
2156                         break;
2157                 }
2158         }
2159
2160         /* If we have finished mapping on previous device, shift logical
2161          * offset to start of next device */
2162         if ((lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
2163                                    &lun_start, &lun_end)) != 0 &&
2164                                    local_end < lun_end) {
2165                 fm_end_offset = local_end;
2166                 *start_stripe = stripe_no;
2167         } else {
2168                 /* This is a special value to indicate that caller should
2169                  * calculate offset in next stripe. */
2170                 fm_end_offset = 0;
2171                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
2172         }
2173
2174         return fm_end_offset;
2175 }
2176
2177 /**
2178  * We calculate on which OST the mapping will end. If the length of mapping
2179  * is greater than (stripe_size * stripe_count) then the last_stripe will
2180  * will be one just before start_stripe. Else we check if the mapping
2181  * intersects each OST and find last_stripe.
2182  * This function returns the last_stripe and also sets the stripe_count
2183  * over which the mapping is spread
2184  *
2185  * \param lsm striping information for the file
2186  * \param fm_start logical start of mapping
2187  * \param fm_end logical end of mapping
2188  * \param start_stripe starting stripe of the mapping
2189  * \param stripe_count the number of stripes across which to map is returned
2190  *
2191  * \retval last_stripe return the last stripe of the mapping
2192  */
2193 int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, obd_size fm_start,
2194                             obd_size fm_end, int start_stripe,
2195                             int *stripe_count)
2196 {
2197         int last_stripe;
2198         obd_off obd_start, obd_end;
2199         int i, j;
2200
2201         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
2202                 last_stripe = (start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
2203                                                               start_stripe - 1);
2204                 *stripe_count = lsm->lsm_stripe_count;
2205         } else {
2206                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
2207                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
2208                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
2209                                                    &obd_start, &obd_end)) == 0)
2210                                 break;
2211                 }
2212                 *stripe_count = j;
2213                 last_stripe = (start_stripe + j - 1) %lsm->lsm_stripe_count;
2214         }
2215
2216         return last_stripe;
2217 }
2218
2219 /**
2220  * Set fe_device and copy extents from local buffer into main return buffer.
2221  *
2222  * \param fiemap fiemap request header
2223  * \param lcl_fm_ext array of local fiemap extents to be copied
2224  * \param ost_index OST index to be written into the fm_device field for each
2225                     extent
2226  * \param ext_count number of extents to be copied
2227  * \param current_extent where to start copying in main extent array
2228  */
2229 void fiemap_prepare_and_copy_exts(struct ll_user_fiemap *fiemap,
2230                                   struct ll_fiemap_extent *lcl_fm_ext,
2231                                   int ost_index, unsigned int ext_count,
2232                                   int current_extent)
2233 {
2234         char *to;
2235         int ext;
2236
2237         for (ext = 0; ext < ext_count; ext++) {
2238                 lcl_fm_ext[ext].fe_device = ost_index;
2239                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
2240         }
2241
2242         /* Copy fm_extent's from fm_local to return buffer */
2243         to = (char *)fiemap + fiemap_count_to_size(current_extent);
2244         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct ll_fiemap_extent));
2245 }
2246
2247 /**
2248  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
2249  * This also handles the restarting of FIEMAP calls in case mapping overflows
2250  * the available number of extents in single call.
2251  */
2252 static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
2253                       __u32 *vallen, void *val, struct lov_stripe_md *lsm)
2254 {
2255         struct ll_fiemap_info_key *fm_key = key;
2256         struct ll_user_fiemap *fiemap = val;
2257         struct ll_user_fiemap *fm_local = NULL;
2258         struct ll_fiemap_extent *lcl_fm_ext;
2259         int count_local;
2260         unsigned int get_num_extents = 0;
2261         int ost_index = 0, actual_start_stripe, start_stripe;
2262         obd_size fm_start, fm_end, fm_length, fm_end_offset = 0;
2263         obd_size curr_loc;
2264         int current_extent = 0, rc = 0, i;
2265         int ost_eof = 0; /* EOF for object */
2266         int ost_done = 0; /* done with required mapping for this OST? */
2267         int last_stripe;
2268         int cur_stripe = 0, cur_stripe_wrap = 0, stripe_count;
2269         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
2270
2271         if (lsm == NULL)
2272                 GOTO(out, rc = 0);
2273
2274         if (fiemap_count_to_size(fm_key->fiemap.fm_extent_count) < buffer_size)
2275                 buffer_size = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
2276
2277         OBD_ALLOC(fm_local, buffer_size);
2278         if (fm_local == NULL)
2279                 GOTO(out, rc = -ENOMEM);
2280         lcl_fm_ext = &fm_local->fm_extents[0];
2281
2282         count_local = fiemap_size_to_count(buffer_size);
2283
2284         memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
2285         fm_start = fiemap->fm_start;
2286         fm_length = fiemap->fm_length;
2287         /* Calculate start stripe, last stripe and length of mapping */
2288         actual_start_stripe = start_stripe = lov_stripe_number(lsm, fm_start);
2289         fm_end = (fm_length == ~0ULL ? fm_key->oa.o_size :
2290                                                 fm_start + fm_length - 1);
2291         /* If fm_length != ~0ULL but fm_start+fm_length-1 exceeds file size */
2292         if (fm_end > fm_key->oa.o_size)
2293                 fm_end = fm_key->oa.o_size;
2294
2295         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
2296                                             actual_start_stripe, &stripe_count);
2297
2298         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start, fm_end,
2299                                                   &start_stripe);
2300
2301         if (fiemap->fm_extent_count == 0) {
2302                 get_num_extents = 1;
2303                 count_local = 0;
2304         }
2305
2306         /* Check each stripe */
2307         for (cur_stripe = start_stripe, i = 0; i < stripe_count;
2308              i++, cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
2309                 obd_size req_fm_len; /* Stores length of required mapping */
2310                 obd_size len_mapped_single_call;
2311                 obd_off lun_start, lun_end, obd_object_end;
2312                 unsigned int ext_count;
2313
2314                 cur_stripe_wrap = cur_stripe;
2315
2316                 /* Find out range of mapping on this stripe */
2317                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
2318                                            &lun_start, &obd_object_end)) == 0)
2319                         continue;
2320
2321                 /* If this is a continuation FIEMAP call and we are on
2322                  * starting stripe then lun_start needs to be set to
2323                  * fm_end_offset */
2324                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
2325                         lun_start = fm_end_offset;
2326
2327                 if (fm_length != ~0ULL) {
2328                         /* Handle fm_start + fm_length overflow */
2329                         if (fm_start + fm_length < fm_start)
2330                                 fm_length = ~0ULL - fm_start;
2331                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
2332                                                      cur_stripe);
2333                 } else {
2334                         lun_end = ~0ULL;
2335                 }
2336
2337                 if (lun_start == lun_end)
2338                         continue;
2339
2340                 req_fm_len = obd_object_end - lun_start;
2341                 fm_local->fm_length = 0;
2342                 len_mapped_single_call = 0;
2343
2344                 /* If the output buffer is very large and the objects have many
2345                  * extents we may need to loop on a single OST repeatedly */
2346                 ost_eof = 0;
2347                 ost_done = 0;
2348                 do {
2349                         if (get_num_extents == 0) {
2350                                 /* Don't get too many extents. */
2351                                 if (current_extent + count_local >
2352                                     fiemap->fm_extent_count)
2353                                         count_local = fiemap->fm_extent_count -
2354                                                                  current_extent;
2355                         }
2356
2357                         lun_start += len_mapped_single_call;
2358                         fm_local->fm_length = req_fm_len - len_mapped_single_call;
2359                         req_fm_len = fm_local->fm_length;
2360                         fm_local->fm_extent_count = count_local;
2361                         fm_local->fm_mapped_extents = 0;
2362                         fm_local->fm_flags = fiemap->fm_flags;
2363
2364                         fm_key->oa.o_id = lsm->lsm_oinfo[cur_stripe]->loi_id;
2365                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
2366
2367                         if (ost_index < 0 || ost_index >=lov->desc.ld_tgt_count)
2368                                 GOTO(out, rc = -EINVAL);
2369
2370                         /* If OST is inactive, return extent with UNKNOWN flag */
2371                         if (!lov->lov_tgts[ost_index]->ltd_active) {
2372                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
2373                                 fm_local->fm_mapped_extents = 1;
2374
2375                                 lcl_fm_ext[0].fe_logical = lun_start;
2376                                 lcl_fm_ext[0].fe_length = obd_object_end -
2377                                                                       lun_start;
2378                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
2379
2380                                 goto inactive_tgt;
2381                         }
2382
2383                         fm_local->fm_start = lun_start;
2384                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
2385                         memcpy(&fm_key->fiemap, fm_local, sizeof(*fm_local));
2386                         *vallen=fiemap_count_to_size(fm_local->fm_extent_count);
2387                         rc = obd_get_info(lov->lov_tgts[ost_index]->ltd_exp,
2388                                           keylen, key, vallen, fm_local, lsm);
2389                         if (rc != 0)
2390                                 GOTO(out, rc);
2391
2392 inactive_tgt:
2393                         ext_count = fm_local->fm_mapped_extents;
2394                         if (ext_count == 0) {
2395                                 ost_done = 1;
2396                                 /* If last stripe has hole at the end,
2397                                  * then we need to return */
2398                                 if (cur_stripe_wrap == last_stripe) {
2399                                         fiemap->fm_mapped_extents = 0;
2400                                         goto finish;
2401                                 }
2402                                 break;
2403                         }
2404
2405                         /* If we just need num of extents then go to next device */
2406                         if (get_num_extents) {
2407                                 current_extent += ext_count;
2408                                 break;
2409                         }
2410
2411                         len_mapped_single_call = lcl_fm_ext[ext_count-1].fe_logical -
2412                                   lun_start + lcl_fm_ext[ext_count - 1].fe_length;
2413
2414                         /* Have we finished mapping on this device? */
2415                         if (req_fm_len <= len_mapped_single_call)
2416                                 ost_done = 1;
2417
2418                         /* Clear the EXTENT_LAST flag which can be present on
2419                          * last extent */
2420                         if (lcl_fm_ext[ext_count-1].fe_flags & FIEMAP_EXTENT_LAST)
2421                                 lcl_fm_ext[ext_count - 1].fe_flags &=
2422                                                             ~FIEMAP_EXTENT_LAST;
2423
2424                         curr_loc = lov_stripe_size(lsm,
2425                                            lcl_fm_ext[ext_count - 1].fe_logical+
2426                                            lcl_fm_ext[ext_count - 1].fe_length,
2427                                            cur_stripe);
2428                         if (curr_loc >= fm_key->oa.o_size)
2429                                 ost_eof = 1;
2430
2431                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
2432                                                      ost_index, ext_count,
2433                                                      current_extent);
2434
2435                         current_extent += ext_count;
2436
2437                         /* Ran out of available extents? */
2438                         if (current_extent >= fiemap->fm_extent_count)
2439                                 goto finish;
2440                 } while (ost_done == 0 && ost_eof == 0);
2441
2442                 if (cur_stripe_wrap == last_stripe)
2443                         goto finish;
2444         }
2445
2446 finish:
2447         /* Indicate that we are returning device offsets unless file just has
2448          * single stripe */
2449         if (lsm->lsm_stripe_count > 1)
2450                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
2451
2452         if (get_num_extents)
2453                 goto skip_last_device_calc;
2454
2455         /* Check if we have reached the last stripe and whether mapping for that
2456          * stripe is done. */
2457         if (cur_stripe_wrap == last_stripe) {
2458                 if (ost_done || ost_eof)
2459                         fiemap->fm_extents[current_extent - 1].fe_flags |=
2460                                                              FIEMAP_EXTENT_LAST;
2461         }
2462
2463 skip_last_device_calc:
2464         fiemap->fm_mapped_extents = current_extent;
2465
2466 out:
2467         OBD_FREE(fm_local, buffer_size);
2468         return rc;
2469 }
2470
2471 static int lov_get_info(struct obd_export *exp, __u32 keylen,
2472                         void *key, __u32 *vallen, void *val,
2473                         struct lov_stripe_md *lsm)
2474 {
2475         struct obd_device *obddev = class_exp2obd(exp);
2476         struct lov_obd *lov = &obddev->u.lov;
2477         int i, rc;
2478         ENTRY;
2479
2480         if (!vallen || !val)
2481                 RETURN(-EFAULT);
2482
2483         obd_getref(obddev);
2484
2485         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
2486                 struct {
2487                         char name[16];
2488                         struct ldlm_lock *lock;
2489                 } *data = key;
2490                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
2491                 struct lov_oinfo *loi;
2492                 __u32 *stripe = val;
2493
2494                 if (*vallen < sizeof(*stripe))
2495                         GOTO(out, rc = -EFAULT);
2496                 *vallen = sizeof(*stripe);
2497
2498                 /* XXX This is another one of those bits that will need to
2499                  * change if we ever actually support nested LOVs.  It uses
2500                  * the lock's export to find out which stripe it is. */
2501                 /* XXX - it's assumed all the locks for deleted OSTs have
2502                  * been cancelled. Also, the export for deleted OSTs will
2503                  * be NULL and won't match the lock's export. */
2504                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
2505                         loi = lsm->lsm_oinfo[i];
2506                         if (!lov->lov_tgts[loi->loi_ost_idx])
2507                                 continue;
2508                         if (lov->lov_tgts[loi->loi_ost_idx]->ltd_exp ==
2509                             data->lock->l_conn_export &&
2510                             osc_res_name_eq(loi->loi_id, loi->loi_gr, res_id)) {
2511                                 *stripe = i;
2512                                 GOTO(out, rc = 0);
2513                         }
2514                 }
2515                 LDLM_ERROR(data->lock, "lock on inode without such object");
2516                 dump_lsm(D_ERROR, lsm);
2517                 GOTO(out, rc = -ENXIO);
2518         } else if (KEY_IS(KEY_LAST_ID)) {
2519                 struct obd_id_info *info = val;
2520                 __u32 size = sizeof(obd_id);
2521                 struct lov_tgt_desc *tgt;
2522
2523                 LASSERT(*vallen == sizeof(struct obd_id_info));
2524                 tgt = lov->lov_tgts[info->idx];
2525
2526                 if (!tgt || !tgt->ltd_active)
2527                         GOTO(out, rc = -ESRCH);
2528
2529                 rc = obd_get_info(tgt->ltd_exp, keylen, key, &size, info->data, NULL);
2530                 GOTO(out, rc = 0);
2531         } else if (KEY_IS(KEY_LOVDESC)) {
2532                 struct lov_desc *desc_ret = val;
2533                 *desc_ret = lov->desc;
2534
2535                 GOTO(out, rc = 0);
2536         } else if (KEY_IS(KEY_FIEMAP)) {
2537                 rc = lov_fiemap(lov, keylen, key, vallen, val, lsm);
2538                 GOTO(out, rc);
2539         }
2540
2541         rc = -EINVAL;
2542
2543 out:
2544         obd_putref(obddev);
2545         RETURN(rc);
2546 }
2547
2548 static int lov_set_info_async(struct obd_export *exp, obd_count keylen,
2549                               void *key, obd_count vallen, void *val,
2550                               struct ptlrpc_request_set *set)
2551 {
2552         struct obd_device *obddev = class_exp2obd(exp);
2553         struct lov_obd *lov = &obddev->u.lov;
2554         obd_count count;
2555         int i, rc = 0, err;
2556         struct lov_tgt_desc *tgt;
2557         unsigned incr, check_uuid,
2558                  do_inactive, no_set;
2559         unsigned next_id = 0,  mds_con = 0, capa = 0;
2560         ENTRY;
2561
2562         incr = check_uuid = do_inactive = no_set = 0;
2563         if (set == NULL) {
2564                 no_set = 1;
2565                 set = ptlrpc_prep_set();
2566                 if (!set)
2567                         RETURN(-ENOMEM);
2568         }
2569
2570         obd_getref(obddev);
2571         count = lov->desc.ld_tgt_count;
2572
2573         if (KEY_IS(KEY_NEXT_ID)) {
2574                 count = vallen / sizeof(struct obd_id_info);
2575                 vallen = sizeof(obd_id);
2576                 incr = sizeof(struct obd_id_info);
2577                 do_inactive = 1;
2578                 next_id = 1;
2579         } else if (KEY_IS(KEY_CHECKSUM)) {
2580                 do_inactive = 1;
2581         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2582                 /* use defaults:  do_inactive = incr = 0; */
2583         } else if (KEY_IS(KEY_MDS_CONN)) {
2584                 mds_con = 1;
2585         } else if (KEY_IS(KEY_CAPA_KEY)) {
2586                 capa = 1;
2587         }
2588
2589         for (i = 0; i < count; i++, val = (char *)val + incr) {
2590                 if (next_id) {
2591                         tgt = lov->lov_tgts[((struct obd_id_info*)val)->idx];
2592                 } else {
2593                         tgt = lov->lov_tgts[i];
2594                 }
2595                 /* OST was disconnected */
2596                 if (!tgt || !tgt->ltd_exp)
2597                         continue;
2598
2599                 /* OST is inactive and we don't want inactive OSCs */
2600                 if (!tgt->ltd_active && !do_inactive)
2601                         continue;
2602
2603                 if (mds_con) {
2604                         struct mds_group_info *mgi;
2605
2606                         LASSERT(vallen == sizeof(*mgi));
2607                         mgi = (struct mds_group_info *)val;
2608
2609                         /* Only want a specific OSC */
2610                         if (mgi->uuid && !obd_uuid_equals(mgi->uuid,
2611                                                 &tgt->ltd_uuid))
2612                                 continue;
2613
2614                         err = obd_set_info_async(tgt->ltd_exp,
2615                                          keylen, key, sizeof(int),
2616                                          &mgi->group, set);
2617                 } else if (next_id) {
2618                         err = obd_set_info_async(tgt->ltd_exp,
2619                                          keylen, key, vallen,
2620                                          ((struct obd_id_info*)val)->data, set);
2621                 } else if (capa) {
2622                         struct mds_capa_info *info = (struct mds_capa_info*)val;
2623
2624                         LASSERT(vallen == sizeof(*info));
2625
2626                          /* Only want a specific OSC */
2627                         if (info->uuid &&
2628                             !obd_uuid_equals(info->uuid, &tgt->ltd_uuid))
2629                                 continue;
2630
2631                         err = obd_set_info_async(tgt->ltd_exp, keylen, key,
2632                                                  sizeof(*info->capa),
2633                                                  info->capa, set);
2634
2635                 } else {
2636                         /* Only want a specific OSC */
2637                         if (check_uuid &&
2638                             !obd_uuid_equals(val, &tgt->ltd_uuid))
2639                                 continue;
2640
2641                         err = obd_set_info_async(tgt->ltd_exp,
2642                                          keylen, key, vallen, val, set);
2643                 }
2644
2645                 if (!rc)
2646                         rc = err;
2647         }
2648
2649         obd_putref(obddev);
2650         if (no_set) {
2651                 err = ptlrpc_set_wait(set);
2652                 if (!rc)
2653                         rc = err;
2654                 ptlrpc_set_destroy(set);
2655         }
2656         RETURN(rc);
2657 }
2658
2659 int lov_test_and_clear_async_rc(struct lov_stripe_md *lsm)
2660 {
2661         int i, rc = 0;
2662         ENTRY;
2663
2664         for (i = 0; i < lsm->lsm_stripe_count; i++) {
2665                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
2666                 if (loi->loi_ar.ar_rc && !rc)
2667                         rc = loi->loi_ar.ar_rc;
2668                 loi->loi_ar.ar_rc = 0;
2669         }
2670         RETURN(rc);
2671 }
2672 EXPORT_SYMBOL(lov_test_and_clear_async_rc);
2673
2674
2675 static int lov_extent_calc(struct obd_export *exp, struct lov_stripe_md *lsm,
2676                            int cmd, __u64 *offset)
2677 {
2678         __u32 ssize = lsm->lsm_stripe_size;
2679         __u64 start;
2680
2681         start = *offset;
2682         do_div(start, ssize);
2683         start = start * ssize;
2684
2685         CDEBUG(D_DLMTRACE, "offset "LPU64", stripe %u, start "LPU64
2686                            ", end "LPU64"\n", *offset, ssize, start,
2687                            start + ssize - 1);
2688         if (cmd == OBD_CALC_STRIPE_END) {
2689                 *offset = start + ssize - 1;
2690         } else if (cmd == OBD_CALC_STRIPE_START) {
2691                 *offset = start;
2692         } else {
2693                 LBUG();
2694         }
2695
2696         RETURN(0);
2697 }
2698
2699 void lov_stripe_lock(struct lov_stripe_md *md)
2700 {
2701         LASSERT(md->lsm_lock_owner != cfs_curproc_pid());
2702         cfs_spin_lock(&md->lsm_lock);
2703         LASSERT(md->lsm_lock_owner == 0);
2704         md->lsm_lock_owner = cfs_curproc_pid();
2705 }
2706 EXPORT_SYMBOL(lov_stripe_lock);
2707
2708 void lov_stripe_unlock(struct lov_stripe_md *md)
2709 {
2710         LASSERT(md->lsm_lock_owner == cfs_curproc_pid());
2711         md->lsm_lock_owner = 0;
2712         cfs_spin_unlock(&md->lsm_lock);
2713 }
2714 EXPORT_SYMBOL(lov_stripe_unlock);
2715
2716
2717 struct obd_ops lov_obd_ops = {
2718         .o_owner               = THIS_MODULE,
2719         .o_setup               = lov_setup,
2720         .o_precleanup          = lov_precleanup,
2721         .o_cleanup             = lov_cleanup,
2722         //.o_process_config      = lov_process_config,
2723         .o_connect             = lov_connect,
2724         .o_disconnect          = lov_disconnect,
2725         .o_statfs              = lov_statfs,
2726         .o_statfs_async        = lov_statfs_async,
2727         .o_packmd              = lov_packmd,
2728         .o_unpackmd            = lov_unpackmd,
2729         .o_create              = lov_create,
2730         .o_destroy             = lov_destroy,
2731         .o_getattr             = lov_getattr,
2732         .o_getattr_async       = lov_getattr_async,
2733         .o_setattr             = lov_setattr,
2734         .o_setattr_async       = lov_setattr_async,
2735         .o_brw                 = lov_brw,
2736         .o_merge_lvb           = lov_merge_lvb,
2737         .o_adjust_kms          = lov_adjust_kms,
2738         .o_punch               = lov_punch,
2739         .o_sync                = lov_sync,
2740         .o_enqueue             = lov_enqueue,
2741         .o_change_cbdata       = lov_change_cbdata,
2742         .o_cancel              = lov_cancel,
2743         .o_cancel_unused       = lov_cancel_unused,
2744         .o_iocontrol           = lov_iocontrol,
2745         .o_get_info            = lov_get_info,
2746         .o_set_info_async      = lov_set_info_async,
2747         .o_extent_calc         = lov_extent_calc,
2748         .o_llog_init           = lov_llog_init,
2749         .o_llog_finish         = lov_llog_finish,
2750         .o_notify              = lov_notify,
2751         .o_pool_new            = lov_pool_new,
2752         .o_pool_rem            = lov_pool_remove,
2753         .o_pool_add            = lov_pool_add,
2754         .o_pool_del            = lov_pool_del,
2755         .o_getref              = lov_getref,
2756         .o_putref              = lov_putref,
2757 };
2758
2759 static quota_interface_t *quota_interface;
2760 extern quota_interface_t lov_quota_interface;
2761
2762 cfs_mem_cache_t *lov_oinfo_slab;
2763
2764 extern struct lu_kmem_descr lov_caches[];
2765
2766 int __init lov_init(void)
2767 {
2768         struct lprocfs_static_vars lvars = { 0 };
2769         int rc, rc2;
2770         ENTRY;
2771
2772         /* print an address of _any_ initialized kernel symbol from this
2773          * module, to allow debugging with gdb that doesn't support data
2774          * symbols from modules.*/
2775         CDEBUG(D_CONSOLE, "Lustre LOV module (%p).\n", &lov_caches);
2776
2777         rc = lu_kmem_init(lov_caches);
2778         if (rc)
2779                 return rc;
2780
2781         lov_oinfo_slab = cfs_mem_cache_create("lov_oinfo",
2782                                               sizeof(struct lov_oinfo),
2783                                               0, CFS_SLAB_HWCACHE_ALIGN);
2784         if (lov_oinfo_slab == NULL) {
2785                 lu_kmem_fini(lov_caches);
2786                 return -ENOMEM;
2787         }
2788         lprocfs_lov_init_vars(&lvars);
2789
2790         cfs_request_module("lquota");
2791         quota_interface = PORTAL_SYMBOL_GET(lov_quota_interface);
2792         init_obd_quota_ops(quota_interface, &lov_obd_ops);
2793
2794         rc = class_register_type(&lov_obd_ops, NULL, lvars.module_vars,
2795                                  LUSTRE_LOV_NAME, &lov_device_type);
2796
2797         if (rc) {
2798                 if (quota_interface)
2799                         PORTAL_SYMBOL_PUT(lov_quota_interface);
2800                 rc2 = cfs_mem_cache_destroy(lov_oinfo_slab);
2801                 LASSERT(rc2 == 0);
2802                 lu_kmem_fini(lov_caches);
2803         }
2804
2805         RETURN(rc);
2806 }
2807
2808 #ifdef __KERNEL__
2809 static void /*__exit*/ lov_exit(void)
2810 {
2811         int rc;
2812
2813         lu_device_type_fini(&lov_device_type);
2814         lu_kmem_fini(lov_caches);
2815
2816         if (quota_interface)
2817                 PORTAL_SYMBOL_PUT(lov_quota_interface);
2818
2819         class_unregister_type(LUSTRE_LOV_NAME);
2820         rc = cfs_mem_cache_destroy(lov_oinfo_slab);
2821         LASSERT(rc == 0);
2822 }
2823
2824 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2825 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
2826 MODULE_LICENSE("GPL");
2827
2828 cfs_module(lov, LUSTRE_VERSION_STRING, lov_init, lov_exit);
2829 #endif