drivers/staging/lustre/lustre/lov/lov_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  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 #define DEBUG_SUBSYSTEM S_LOV
  45 #include "../../include/linux/libcfs/libcfs.h"
  46
  47 #include "../include/obd_support.h"
  48 #include "../include/lustre_lib.h"
  49 #include "../include/lustre_net.h"
  50 #include "../include/lustre/lustre_idl.h"
  51 #include "../include/lustre_dlm.h"
  52 #include "../include/lustre_mds.h"
  53 #include "../include/obd_class.h"
  54 #include "../include/lprocfs_status.h"
  55 #include "../include/lustre_param.h"
  56 #include "../include/cl_object.h"
  57 #include "../include/lclient.h"         /* for cl_client_lru */
  58 #include "../include/lustre/ll_fiemap.h"
  59 #include "../include/lustre_fid.h"
  60
  61 #include "lov_internal.h"
  62
  63 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  64    Any function that expects lov_tgts to remain stationary must take a ref. */
  65 static void lov_getref(struct obd_device *obd)
  66 {
  67         struct lov_obd *lov = &obd->u.lov;
  68
  69         /* nobody gets through here until lov_putref is done */
  70         mutex_lock(&lov->lov_lock);
  71         atomic_inc(&lov->lov_refcount);
  72         mutex_unlock(&lov->lov_lock);
  73         return;
  74 }
  75
  76 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  77
  78 static void lov_putref(struct obd_device *obd)
  79 {
  80         struct lov_obd *lov = &obd->u.lov;
  81
  82         mutex_lock(&lov->lov_lock);
  83         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  84         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  85                 LIST_HEAD(kill);
  86                 int i;
  87                 struct lov_tgt_desc *tgt, *n;
  88
  89                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  90                        lov->lov_death_row);
  91                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  92                         tgt = lov->lov_tgts[i];
  93
  94                         if (!tgt || !tgt->ltd_reap)
  95                                 continue;
  96                         list_add(&tgt->ltd_kill, &kill);
  97                         /* XXX - right now there is a dependency on ld_tgt_count
  98                          * being the maximum tgt index for computing the
  99                          * mds_max_easize. So we can't shrink it. */
 100                         lov_ost_pool_remove(&lov->lov_packed, i);
 101                         lov->lov_tgts[i] = NULL;
 102                         lov->lov_death_row--;
 103                 }
 104                 mutex_unlock(&lov->lov_lock);
 105
 106                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 107                         list_del(&tgt->ltd_kill);
 108                         /* Disconnect */
 109                         __lov_del_obd(obd, tgt);
 110                 }
 111
 112                 if (lov->lov_tgts_kobj)
 113                         kobject_put(lov->lov_tgts_kobj);
 114
 115         } else {
 116                 mutex_unlock(&lov->lov_lock);
 117         }
 118 }
 119
 120 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 121                               enum obd_notify_event ev);
 122 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 123                       enum obd_notify_event ev, void *data);
 124
 125
 126 #define MAX_STRING_SIZE 128
 127 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 128                     struct obd_connect_data *data)
 129 {
 130         struct lov_obd *lov = &obd->u.lov;
 131         struct obd_uuid *tgt_uuid;
 132         struct obd_device *tgt_obd;
 133         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 134         struct obd_import *imp;
 135         int rc;
 136
 137         if (!lov->lov_tgts[index])
 138                 return -EINVAL;
 139
 140         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 141         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 142
 143         if (!tgt_obd->obd_set_up) {
 144                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 145                 return -EINVAL;
 146         }
 147
 148         /* override the sp_me from lov */
 149         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 150
 151         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 152                 data->ocd_index = index;
 153
 154         /*
 155          * Divine LOV knows that OBDs under it are OSCs.
 156          */
 157         imp = tgt_obd->u.cli.cl_import;
 158
 159         if (activate) {
 160                 tgt_obd->obd_no_recov = 0;
 161                 /* FIXME this is probably supposed to be
 162                    ptlrpc_set_import_active.  Horrible naming. */
 163                 ptlrpc_activate_import(imp);
 164         }
 165
 166         rc = obd_register_observer(tgt_obd, obd);
 167         if (rc) {
 168                 CERROR("Target %s register_observer error %d\n",
 169                        obd_uuid2str(tgt_uuid), rc);
 170                 return rc;
 171         }
 172
 173
 174         if (imp->imp_invalid) {
 175                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively disabled\n",
 176                        obd_uuid2str(tgt_uuid));
 177                 return 0;
 178         }
 179
 180         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 181                          &lov_osc_uuid, data, NULL);
 182         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 183                 CERROR("Target %s connect error %d\n",
 184                        obd_uuid2str(tgt_uuid), rc);
 185                 return -ENODEV;
 186         }
 187
 188         lov->lov_tgts[index]->ltd_reap = 0;
 189
 190         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 191                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 192
 193         if (lov->lov_tgts_kobj)
 194                 /* Even if we failed, that's ok */
 195                 rc = sysfs_create_link(lov->lov_tgts_kobj, &tgt_obd->obd_kobj,
 196                                        tgt_obd->obd_name);
 197
 198         return 0;
 199 }
 200
 201 static int lov_connect(const struct lu_env *env,
 202                        struct obd_export **exp, struct obd_device *obd,
 203                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 204                        void *localdata)
 205 {
 206         struct lov_obd *lov = &obd->u.lov;
 207         struct lov_tgt_desc *tgt;
 208         struct lustre_handle conn;
 209         int i, rc;
 210
 211         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 212
 213         rc = class_connect(&conn, obd, cluuid);
 214         if (rc)
 215                 return rc;
 216
 217         *exp = class_conn2export(&conn);
 218
 219         /* Why should there ever be more than 1 connect? */
 220         lov->lov_connects++;
 221         LASSERT(lov->lov_connects == 1);
 222
 223         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 224         if (data)
 225                 lov->lov_ocd = *data;
 226
 227         obd_getref(obd);
 228
 229         lov->lov_tgts_kobj = kobject_create_and_add("target_obds",
 230                                                     &obd->obd_kobj);
 231
 232         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 233                 tgt = lov->lov_tgts[i];
 234                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 235                         continue;
 236                 /* Flags will be lowest common denominator */
 237                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 238                 if (rc) {
 239                         CERROR("%s: lov connect tgt %d failed: %d\n",
 240                                obd->obd_name, i, rc);
 241                         continue;
 242                 }
 243                 /* connect to administrative disabled ost */
 244                 if (!lov->lov_tgts[i]->ltd_exp)
 245                         continue;
 246
 247                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 248                                 OBD_NOTIFY_CONNECT, (void *)&i);
 249                 if (rc) {
 250                         CERROR("%s error sending notify %d\n",
 251                                obd->obd_name, rc);
 252                 }
 253         }
 254         obd_putref(obd);
 255
 256         return 0;
 257 }
 258
 259 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 260 {
 261         struct lov_obd *lov = &obd->u.lov;
 262         struct obd_device *osc_obd;
 263         int rc;
 264
 265         osc_obd = class_exp2obd(tgt->ltd_exp);
 266         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 267                 obd->obd_name, osc_obd ? osc_obd->obd_name : "NULL");
 268
 269         if (tgt->ltd_active) {
 270                 tgt->ltd_active = 0;
 271                 lov->desc.ld_active_tgt_count--;
 272                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 273         }
 274
 275         if (osc_obd) {
 276                 if (lov->lov_tgts_kobj)
 277                         sysfs_remove_link(lov->lov_tgts_kobj,
 278                                           osc_obd->obd_name);
 279
 280                 /* Pass it on to our clients.
 281                  * XXX This should be an argument to disconnect,
 282                  * XXX not a back-door flag on the OBD.  Ah well.
 283                  */
 284                 osc_obd->obd_force = obd->obd_force;
 285                 osc_obd->obd_fail = obd->obd_fail;
 286                 osc_obd->obd_no_recov = obd->obd_no_recov;
 287         }
 288
 289         obd_register_observer(osc_obd, NULL);
 290
 291         rc = obd_disconnect(tgt->ltd_exp);
 292         if (rc) {
 293                 CERROR("Target %s disconnect error %d\n",
 294                        tgt->ltd_uuid.uuid, rc);
 295                 rc = 0;
 296         }
 297
 298         tgt->ltd_exp = NULL;
 299         return 0;
 300 }
 301
 302 static int lov_disconnect(struct obd_export *exp)
 303 {
 304         struct obd_device *obd = class_exp2obd(exp);
 305         struct lov_obd *lov = &obd->u.lov;
 306         int i, rc;
 307
 308         if (!lov->lov_tgts)
 309                 goto out;
 310
 311         /* Only disconnect the underlying layers on the final disconnect. */
 312         lov->lov_connects--;
 313         if (lov->lov_connects != 0) {
 314                 /* why should there be more than 1 connect? */
 315                 CERROR("disconnect #%d\n", lov->lov_connects);
 316                 goto out;
 317         }
 318
 319         /* Let's hold another reference so lov_del_obd doesn't spin through
 320            putref every time */
 321         obd_getref(obd);
 322
 323         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 324                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 325                         /* Disconnection is the last we know about an obd */
 326                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
 327                 }
 328         }
 329
 330         obd_putref(obd);
 331
 332 out:
 333         rc = class_disconnect(exp); /* bz 9811 */
 334         return rc;
 335 }
 336
 337 /* Error codes:
 338  *
 339  *  -EINVAL  : UUID can't be found in the LOV's target list
 340  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 341  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 342  *  any >= 0 : is log target index
 343  */
 344 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 345                               enum obd_notify_event ev)
 346 {
 347         struct lov_obd *lov = &obd->u.lov;
 348         struct lov_tgt_desc *tgt;
 349         int index, activate, active;
 350
 351         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 352                lov, uuid->uuid, ev);
 353
 354         obd_getref(obd);
 355         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 356                 tgt = lov->lov_tgts[index];
 357                 if (!tgt)
 358                         continue;
 359                 /*
 360                  * LU-642, initially inactive OSC could miss the obd_connect,
 361                  * we make up for it here.
 362                  */
 363                 if (ev == OBD_NOTIFY_ACTIVATE && tgt->ltd_exp == NULL &&
 364                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 365                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 366
 367                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 368                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 369                 }
 370                 if (!tgt->ltd_exp)
 371                         continue;
 372
 373                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 374                        index, obd_uuid2str(&tgt->ltd_uuid),
 375                        tgt->ltd_exp->exp_handle.h_cookie);
 376                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 377                         break;
 378         }
 379
 380         if (index == lov->desc.ld_tgt_count) {
 381                 index = -EINVAL;
 382                 goto out;
 383         }
 384
 385         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 386                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 387
 388                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 389                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 390                                uuid->uuid, activate ? "" : "de");
 391                 } else {
 392                         lov->lov_tgts[index]->ltd_activate = activate;
 393                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 394                                activate ? "" : "de", obd_uuid2str(uuid));
 395                 }
 396
 397         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 398                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 399
 400                 if (lov->lov_tgts[index]->ltd_active == active) {
 401                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 402                                uuid->uuid, active ? "" : "in");
 403                         goto out;
 404                 } else {
 405                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 406                                obd_uuid2str(uuid), active ? "" : "in");
 407                 }
 408
 409                 lov->lov_tgts[index]->ltd_active = active;
 410                 if (active) {
 411                         lov->desc.ld_active_tgt_count++;
 412                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 413                 } else {
 414                         lov->desc.ld_active_tgt_count--;
 415                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 416                 }
 417         } else {
 418                 CERROR("Unknown event(%d) for uuid %s", ev, uuid->uuid);
 419         }
 420
 421  out:
 422         obd_putref(obd);
 423         return index;
 424 }
 425
 426 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 427                       enum obd_notify_event ev, void *data)
 428 {
 429         int rc = 0;
 430         struct lov_obd *lov = &obd->u.lov;
 431
 432         down_read(&lov->lov_notify_lock);
 433         if (!lov->lov_connects) {
 434                 up_read(&lov->lov_notify_lock);
 435                 return rc;
 436         }
 437
 438         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 439             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 440                 struct obd_uuid *uuid;
 441
 442                 LASSERT(watched);
 443
 444                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 445                         up_read(&lov->lov_notify_lock);
 446                         CERROR("unexpected notification of %s %s!\n",
 447                                watched->obd_type->typ_name,
 448                                watched->obd_name);
 449                         return -EINVAL;
 450                 }
 451                 uuid = &watched->u.cli.cl_target_uuid;
 452
 453                 /* Set OSC as active before notifying the observer, so the
 454                  * observer can use the OSC normally.
 455                  */
 456                 rc = lov_set_osc_active(obd, uuid, ev);
 457                 if (rc < 0) {
 458                         up_read(&lov->lov_notify_lock);
 459                         CERROR("event(%d) of %s failed: %d\n", ev,
 460                                obd_uuid2str(uuid), rc);
 461                         return rc;
 462                 }
 463                 /* active event should be pass lov target index as data */
 464                 data = &rc;
 465         }
 466
 467         /* Pass the notification up the chain. */
 468         if (watched) {
 469                 rc = obd_notify_observer(obd, watched, ev, data);
 470         } else {
 471                 /* NULL watched means all osc's in the lov (only for syncs) */
 472                 /* sync event should be send lov idx as data */
 473                 struct lov_obd *lov = &obd->u.lov;
 474                 int i, is_sync;
 475
 476                 data = &i;
 477                 is_sync = (ev == OBD_NOTIFY_SYNC) ||
 478                           (ev == OBD_NOTIFY_SYNC_NONBLOCK);
 479
 480                 obd_getref(obd);
 481                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 482                         if (!lov->lov_tgts[i])
 483                                 continue;
 484
 485                         /* don't send sync event if target not
 486                          * connected/activated */
 487                         if (is_sync &&  !lov->lov_tgts[i]->ltd_active)
 488                                 continue;
 489
 490                         rc = obd_notify_observer(obd, lov->lov_tgts[i]->ltd_obd,
 491                                                  ev, data);
 492                         if (rc) {
 493                                 CERROR("%s: notify %s of %s failed %d\n",
 494                                        obd->obd_name,
 495                                        obd->obd_observer->obd_name,
 496                                        lov->lov_tgts[i]->ltd_obd->obd_name,
 497                                        rc);
 498                         }
 499                 }
 500                 obd_putref(obd);
 501         }
 502
 503         up_read(&lov->lov_notify_lock);
 504         return rc;
 505 }
 506
 507 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 508                           __u32 index, int gen, int active)
 509 {
 510         struct lov_obd *lov = &obd->u.lov;
 511         struct lov_tgt_desc *tgt;
 512         struct obd_device *tgt_obd;
 513         int rc;
 514
 515         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 516                uuidp->uuid, index, gen, active);
 517
 518         if (gen <= 0) {
 519                 CERROR("request to add OBD %s with invalid generation: %d\n",
 520                        uuidp->uuid, gen);
 521                 return -EINVAL;
 522         }
 523
 524         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 525                                         &obd->obd_uuid);
 526         if (tgt_obd == NULL)
 527                 return -EINVAL;
 528
 529         mutex_lock(&lov->lov_lock);
 530
 531         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 532                 tgt = lov->lov_tgts[index];
 533                 CERROR("UUID %s already assigned at LOV target index %d\n",
 534                        obd_uuid2str(&tgt->ltd_uuid), index);
 535                 mutex_unlock(&lov->lov_lock);
 536                 return -EEXIST;
 537         }
 538
 539         if (index >= lov->lov_tgt_size) {
 540                 /* We need to reallocate the lov target array. */
 541                 struct lov_tgt_desc **newtgts, **old = NULL;
 542                 __u32 newsize, oldsize = 0;
 543
 544                 newsize = max_t(__u32, lov->lov_tgt_size, 2);
 545                 while (newsize < index + 1)
 546                         newsize <<= 1;
 547                 newtgts = kcalloc(newsize, sizeof(*newtgts), GFP_NOFS);
 548                 if (newtgts == NULL) {
 549                         mutex_unlock(&lov->lov_lock);
 550                         return -ENOMEM;
 551                 }
 552
 553                 if (lov->lov_tgt_size) {
 554                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 555                                lov->lov_tgt_size);
 556                         old = lov->lov_tgts;
 557                         oldsize = lov->lov_tgt_size;
 558                 }
 559
 560                 lov->lov_tgts = newtgts;
 561                 lov->lov_tgt_size = newsize;
 562                 smp_rmb();
 563                 kfree(old);
 564
 565                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 566                        lov->lov_tgts, lov->lov_tgt_size);
 567         }
 568
 569         tgt = kzalloc(sizeof(*tgt), GFP_NOFS);
 570         if (!tgt) {
 571                 mutex_unlock(&lov->lov_lock);
 572                 return -ENOMEM;
 573         }
 574
 575         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 576         if (rc) {
 577                 mutex_unlock(&lov->lov_lock);
 578                 kfree(tgt);
 579                 return rc;
 580         }
 581
 582         tgt->ltd_uuid = *uuidp;
 583         tgt->ltd_obd = tgt_obd;
 584         /* XXX - add a sanity check on the generation number. */
 585         tgt->ltd_gen = gen;
 586         tgt->ltd_index = index;
 587         tgt->ltd_activate = active;
 588         lov->lov_tgts[index] = tgt;
 589         if (index >= lov->desc.ld_tgt_count)
 590                 lov->desc.ld_tgt_count = index + 1;
 591
 592         mutex_unlock(&lov->lov_lock);
 593
 594         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 595                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 596
 597         rc = obd_notify(obd, tgt_obd, OBD_NOTIFY_CREATE, &index);
 598
 599         if (lov->lov_connects == 0) {
 600                 /* lov_connect hasn't been called yet. We'll do the
 601                    lov_connect_obd on this target when that fn first runs,
 602                    because we don't know the connect flags yet. */
 603                 return 0;
 604         }
 605
 606         obd_getref(obd);
 607
 608         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 609         if (rc)
 610                 goto out;
 611
 612         /* connect to administrative disabled ost */
 613         if (!tgt->ltd_exp) {
 614                 rc = 0;
 615                 goto out;
 616         }
 617
 618         if (lov->lov_cache != NULL) {
 619                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 620                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 621                                 sizeof(struct cl_client_cache), lov->lov_cache,
 622                                 NULL);
 623                 if (rc < 0)
 624                         goto out;
 625         }
 626
 627         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 628                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 629                         (void *)&index);
 630
 631 out:
 632         if (rc) {
 633                 CERROR("add failed (%d), deleting %s\n", rc,
 634                        obd_uuid2str(&tgt->ltd_uuid));
 635                 lov_del_target(obd, index, NULL, 0);
 636         }
 637         obd_putref(obd);
 638         return rc;
 639 }
 640
 641 /* Schedule a target for deletion */
 642 int lov_del_target(struct obd_device *obd, __u32 index,
 643                    struct obd_uuid *uuidp, int gen)
 644 {
 645         struct lov_obd *lov = &obd->u.lov;
 646         int count = lov->desc.ld_tgt_count;
 647         int rc = 0;
 648
 649         if (index >= count) {
 650                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 651                        index, count);
 652                 return -EINVAL;
 653         }
 654
 655         /* to make sure there's no ongoing lov_notify() now */
 656         down_write(&lov->lov_notify_lock);
 657         obd_getref(obd);
 658
 659         if (!lov->lov_tgts[index]) {
 660                 CERROR("LOV target at index %d is not setup.\n", index);
 661                 rc = -EINVAL;
 662                 goto out;
 663         }
 664
 665         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 666                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 667                        lov_uuid2str(lov, index), index,
 668                        obd_uuid2str(uuidp));
 669                 rc = -EINVAL;
 670                 goto out;
 671         }
 672
 673         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 674                lov_uuid2str(lov, index), index,
 675                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 676                lov->lov_tgts[index]->ltd_active);
 677
 678         lov->lov_tgts[index]->ltd_reap = 1;
 679         lov->lov_death_row++;
 680         /* we really delete it from obd_putref */
 681 out:
 682         obd_putref(obd);
 683         up_write(&lov->lov_notify_lock);
 684
 685         return rc;
 686 }
 687
 688 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 689 {
 690         struct obd_device *osc_obd;
 691
 692         LASSERT(tgt);
 693         LASSERT(tgt->ltd_reap);
 694
 695         osc_obd = class_exp2obd(tgt->ltd_exp);
 696
 697         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 698                tgt->ltd_uuid.uuid,
 699                osc_obd ? osc_obd->obd_name : "<no obd>");
 700
 701         if (tgt->ltd_exp)
 702                 lov_disconnect_obd(obd, tgt);
 703
 704         kfree(tgt);
 705
 706         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 707            do it ourselves. And we can't do it from lov_cleanup,
 708            because we just lost our only reference to it. */
 709         if (osc_obd)
 710                 class_manual_cleanup(osc_obd);
 711 }
 712
 713 void lov_fix_desc_stripe_size(__u64 *val)
 714 {
 715         if (*val < LOV_MIN_STRIPE_SIZE) {
 716                 if (*val != 0)
 717                         LCONSOLE_INFO("Increasing default stripe size to minimum %u\n",
 718                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 719                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 720         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 721                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 722                 LCONSOLE_WARN("Changing default stripe size to %llu (a multiple of %u)\n",
 723                               *val, LOV_MIN_STRIPE_SIZE);
 724         }
 725 }
 726
 727 void lov_fix_desc_stripe_count(__u32 *val)
 728 {
 729         if (*val == 0)
 730                 *val = 1;
 731 }
 732
 733 void lov_fix_desc_pattern(__u32 *val)
 734 {
 735         /* from lov_setstripe */
 736         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 737                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 738                 *val = 0;
 739         }
 740 }
 741
 742 void lov_fix_desc_qos_maxage(__u32 *val)
 743 {
 744         if (*val == 0)
 745                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 746 }
 747
 748 void lov_fix_desc(struct lov_desc *desc)
 749 {
 750         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 751         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 752         lov_fix_desc_pattern(&desc->ld_pattern);
 753         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 754 }
 755
 756 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 757 {
 758         struct lprocfs_static_vars lvars = { NULL };
 759         struct lov_desc *desc;
 760         struct lov_obd *lov = &obd->u.lov;
 761         int rc;
 762
 763         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 764                 CERROR("LOV setup requires a descriptor\n");
 765                 return -EINVAL;
 766         }
 767
 768         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 769
 770         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 771                 CERROR("descriptor size wrong: %d > %d\n",
 772                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 773                 return -EINVAL;
 774         }
 775
 776         if (desc->ld_magic != LOV_DESC_MAGIC) {
 777                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 778                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 779                                    obd->obd_name, desc);
 780                             lustre_swab_lov_desc(desc);
 781                 } else {
 782                         CERROR("%s: Bad lov desc magic: %#x\n",
 783                                obd->obd_name, desc->ld_magic);
 784                         return -EINVAL;
 785                 }
 786         }
 787
 788         lov_fix_desc(desc);
 789
 790         desc->ld_active_tgt_count = 0;
 791         lov->desc = *desc;
 792         lov->lov_tgt_size = 0;
 793
 794         mutex_init(&lov->lov_lock);
 795         atomic_set(&lov->lov_refcount, 0);
 796         lov->lov_sp_me = LUSTRE_SP_CLI;
 797
 798         init_rwsem(&lov->lov_notify_lock);
 799
 800         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 801                                                    HASH_POOLS_MAX_BITS,
 802                                                    HASH_POOLS_BKT_BITS, 0,
 803                                                    CFS_HASH_MIN_THETA,
 804                                                    CFS_HASH_MAX_THETA,
 805                                                    &pool_hash_operations,
 806                                                    CFS_HASH_DEFAULT);
 807         INIT_LIST_HEAD(&lov->lov_pool_list);
 808         lov->lov_pool_count = 0;
 809         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 810         if (rc)
 811                 goto out;
 812
 813         lprocfs_lov_init_vars(&lvars);
 814         lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 815
 816         rc = ldebugfs_seq_create(obd->obd_debugfs_entry, "target_obd",
 817                                  0444, &lov_proc_target_fops, obd);
 818         if (rc)
 819                 CWARN("Error adding the target_obd file\n");
 820
 821         lov->lov_pool_debugfs_entry = ldebugfs_register("pools",
 822                                                      obd->obd_debugfs_entry,
 823                                                      NULL, NULL);
 824         return 0;
 825
 826 out:
 827         return rc;
 828 }
 829
 830 static int lov_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 831 {
 832         struct lov_obd *lov = &obd->u.lov;
 833
 834         switch (stage) {
 835         case OBD_CLEANUP_EARLY: {
 836                 int i;
 837
 838                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 839                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_active)
 840                                 continue;
 841                         obd_precleanup(class_exp2obd(lov->lov_tgts[i]->ltd_exp),
 842                                        OBD_CLEANUP_EARLY);
 843                 }
 844                 break;
 845         }
 846         default:
 847                 break;
 848         }
 849
 850         return 0;
 851 }
 852
 853 static int lov_cleanup(struct obd_device *obd)
 854 {
 855         struct lov_obd *lov = &obd->u.lov;
 856         struct list_head *pos, *tmp;
 857         struct pool_desc *pool;
 858
 859         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 860                 pool = list_entry(pos, struct pool_desc, pool_list);
 861                 /* free pool structs */
 862                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 863                 /* In the function below, .hs_keycmp resolves to
 864                  * pool_hashkey_keycmp() */
 865                 /* coverity[overrun-buffer-val] */
 866                 lov_pool_del(obd, pool->pool_name);
 867         }
 868         cfs_hash_putref(lov->lov_pools_hash_body);
 869         lov_ost_pool_free(&lov->lov_packed);
 870
 871         lprocfs_obd_cleanup(obd);
 872         if (lov->lov_tgts) {
 873                 int i;
 874
 875                 obd_getref(obd);
 876                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 877                         if (!lov->lov_tgts[i])
 878                                 continue;
 879
 880                         /* Inactive targets may never have connected */
 881                         if (lov->lov_tgts[i]->ltd_active ||
 882                             atomic_read(&lov->lov_refcount))
 883                             /* We should never get here - these
 884                                should have been removed in the
 885                              disconnect. */
 886                                 CERROR("lov tgt %d not cleaned! deathrow=%d, lovrc=%d\n",
 887                                        i, lov->lov_death_row,
 888                                        atomic_read(&lov->lov_refcount));
 889                         lov_del_target(obd, i, NULL, 0);
 890                 }
 891                 obd_putref(obd);
 892                 kfree(lov->lov_tgts);
 893                 lov->lov_tgt_size = 0;
 894         }
 895         return 0;
 896 }
 897
 898 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 899                             __u32 *indexp, int *genp)
 900 {
 901         struct obd_uuid obd_uuid;
 902         int cmd;
 903         int rc = 0;
 904
 905         switch (cmd = lcfg->lcfg_command) {
 906         case LCFG_LOV_ADD_OBD:
 907         case LCFG_LOV_ADD_INA:
 908         case LCFG_LOV_DEL_OBD: {
 909                 __u32 index;
 910                 int gen;
 911                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 912                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid)) {
 913                         rc = -EINVAL;
 914                         goto out;
 915                 }
 916
 917                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 918
 919                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", indexp) != 1) {
 920                         rc = -EINVAL;
 921                         goto out;
 922                 }
 923                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1) {
 924                         rc = -EINVAL;
 925                         goto out;
 926                 }
 927                 index = *indexp;
 928                 gen = *genp;
 929                 if (cmd == LCFG_LOV_ADD_OBD)
 930                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 931                 else if (cmd == LCFG_LOV_ADD_INA)
 932                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 933                 else
 934                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 935                 goto out;
 936         }
 937         case LCFG_PARAM: {
 938                 struct lprocfs_static_vars lvars = { NULL };
 939                 struct lov_desc *desc = &(obd->u.lov.desc);
 940
 941                 if (!desc) {
 942                         rc = -EINVAL;
 943                         goto out;
 944                 }
 945
 946                 lprocfs_lov_init_vars(&lvars);
 947
 948                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 949                                               lcfg, obd);
 950                 if (rc > 0)
 951                         rc = 0;
 952                 goto out;
 953         }
 954         case LCFG_POOL_NEW:
 955         case LCFG_POOL_ADD:
 956         case LCFG_POOL_DEL:
 957         case LCFG_POOL_REM:
 958                 goto out;
 959
 960         default: {
 961                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 962                 rc = -EINVAL;
 963                 goto out;
 964
 965         }
 966         }
 967 out:
 968         return rc;
 969 }
 970
 971 static int lov_recreate(struct obd_export *exp, struct obdo *src_oa,
 972                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
 973 {
 974         struct lov_stripe_md *obj_mdp, *lsm;
 975         struct lov_obd *lov = &exp->exp_obd->u.lov;
 976         unsigned ost_idx;
 977         int rc, i;
 978
 979         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 980                 src_oa->o_flags & OBD_FL_RECREATE_OBJS);
 981
 982         obj_mdp = kzalloc(sizeof(*obj_mdp), GFP_NOFS);
 983         if (!obj_mdp)
 984                 return -ENOMEM;
 985
 986         ost_idx = src_oa->o_nlink;
 987         lsm = *ea;
 988         if (lsm == NULL) {
 989                 rc = -EINVAL;
 990                 goto out;
 991         }
 992         if (ost_idx >= lov->desc.ld_tgt_count ||
 993             !lov->lov_tgts[ost_idx]) {
 994                 rc = -EINVAL;
 995                 goto out;
 996         }
 997
 998         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 999                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1000
1001                 if (lov_oinfo_is_dummy(loi))
1002                         continue;
1003
1004                 if (loi->loi_ost_idx == ost_idx) {
1005                         if (ostid_id(&loi->loi_oi) != ostid_id(&src_oa->o_oi)) {
1006                                 rc = -EINVAL;
1007                                 goto out;
1008                         }
1009                         break;
1010                 }
1011         }
1012         if (i == lsm->lsm_stripe_count) {
1013                 rc = -EINVAL;
1014                 goto out;
1015         }
1016
1017         rc = obd_create(NULL, lov->lov_tgts[ost_idx]->ltd_exp,
1018                         src_oa, &obj_mdp, oti);
1019 out:
1020         kfree(obj_mdp);
1021         return rc;
1022 }
1023
1024 /* the LOV expects oa->o_id to be set to the LOV object id */
1025 static int lov_create(const struct lu_env *env, struct obd_export *exp,
1026                       struct obdo *src_oa, struct lov_stripe_md **ea,
1027                       struct obd_trans_info *oti)
1028 {
1029         struct lov_obd *lov;
1030         int rc = 0;
1031
1032         LASSERT(ea != NULL);
1033         if (exp == NULL)
1034                 return -EINVAL;
1035
1036         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1037             src_oa->o_flags == OBD_FL_DELORPHAN) {
1038                 /* should be used with LOV anymore */
1039                 LBUG();
1040         }
1041
1042         lov = &exp->exp_obd->u.lov;
1043         if (!lov->desc.ld_active_tgt_count)
1044                 return -EIO;
1045
1046         obd_getref(exp->exp_obd);
1047         /* Recreate a specific object id at the given OST index */
1048         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1049             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
1050                  rc = lov_recreate(exp, src_oa, ea, oti);
1051         }
1052
1053         obd_putref(exp->exp_obd);
1054         return rc;
1055 }
1056
1057 #define ASSERT_LSM_MAGIC(lsmp)                                            \
1058 do {                                                                        \
1059         LASSERT((lsmp) != NULL);                                                \
1060         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                    \
1061                  (lsmp)->lsm_magic == LOV_MAGIC_V3),                        \
1062                  "%p->lsm_magic=%x\n", (lsmp), (lsmp)->lsm_magic);            \
1063 } while (0)
1064
1065 static int lov_destroy(const struct lu_env *env, struct obd_export *exp,
1066                        struct obdo *oa, struct lov_stripe_md *lsm,
1067                        struct obd_trans_info *oti, struct obd_export *md_exp)
1068 {
1069         struct lov_request_set *set;
1070         struct obd_info oinfo;
1071         struct lov_request *req;
1072         struct list_head *pos;
1073         struct lov_obd *lov;
1074         int rc = 0, err = 0;
1075
1076         ASSERT_LSM_MAGIC(lsm);
1077
1078         if (!exp || !exp->exp_obd)
1079                 return -ENODEV;
1080
1081         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1082                 LASSERT(oti);
1083                 LASSERT(oti->oti_logcookies);
1084         }
1085
1086         lov = &exp->exp_obd->u.lov;
1087         obd_getref(exp->exp_obd);
1088         rc = lov_prep_destroy_set(exp, &oinfo, oa, lsm, oti, &set);
1089         if (rc)
1090                 goto out;
1091
1092         list_for_each(pos, &set->set_list) {
1093                 req = list_entry(pos, struct lov_request, rq_link);
1094
1095                 if (oa->o_valid & OBD_MD_FLCOOKIE)
1096                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1097
1098                 err = obd_destroy(env, lov->lov_tgts[req->rq_idx]->ltd_exp,
1099                                   req->rq_oi.oi_oa, NULL, oti, NULL);
1100                 err = lov_update_common_set(set, req, err);
1101                 if (err) {
1102                         CERROR("%s: destroying objid "DOSTID" subobj "
1103                                DOSTID" on OST idx %d: rc = %d\n",
1104                                exp->exp_obd->obd_name, POSTID(&oa->o_oi),
1105                                POSTID(&req->rq_oi.oi_oa->o_oi),
1106                                req->rq_idx, err);
1107                         if (!rc)
1108                                 rc = err;
1109                 }
1110         }
1111
1112         if (rc == 0) {
1113                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
1114                 rc = lsm_op_find(lsm->lsm_magic)->lsm_destroy(lsm, oa, md_exp);
1115         }
1116         err = lov_fini_destroy_set(set);
1117 out:
1118         obd_putref(exp->exp_obd);
1119         return rc ? rc : err;
1120 }
1121
1122 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset,
1123                                  void *data, int rc)
1124 {
1125         struct lov_request_set *lovset = (struct lov_request_set *)data;
1126         int err;
1127
1128         /* don't do attribute merge if this async op failed */
1129         if (rc)
1130                 atomic_set(&lovset->set_completes, 0);
1131         err = lov_fini_getattr_set(lovset);
1132         return rc ? rc : err;
1133 }
1134
1135 static int lov_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
1136                               struct ptlrpc_request_set *rqset)
1137 {
1138         struct lov_request_set *lovset;
1139         struct lov_obd *lov;
1140         struct list_head *pos;
1141         struct lov_request *req;
1142         int rc = 0, err;
1143
1144         LASSERT(oinfo);
1145         ASSERT_LSM_MAGIC(oinfo->oi_md);
1146
1147         if (!exp || !exp->exp_obd)
1148                 return -ENODEV;
1149
1150         lov = &exp->exp_obd->u.lov;
1151
1152         rc = lov_prep_getattr_set(exp, oinfo, &lovset);
1153         if (rc)
1154                 return rc;
1155
1156         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1157                POSTID(&oinfo->oi_md->lsm_oi), oinfo->oi_md->lsm_stripe_count,
1158                oinfo->oi_md->lsm_stripe_size);
1159
1160         list_for_each(pos, &lovset->set_list) {
1161                 req = list_entry(pos, struct lov_request, rq_link);
1162
1163                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1164                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1165                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1166                 rc = obd_getattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1167                                        &req->rq_oi, rqset);
1168                 if (rc) {
1169                         CERROR("%s: getattr objid "DOSTID" subobj"
1170                                DOSTID" on OST idx %d: rc = %d\n",
1171                                exp->exp_obd->obd_name,
1172                                POSTID(&oinfo->oi_oa->o_oi),
1173                                POSTID(&req->rq_oi.oi_oa->o_oi),
1174                                req->rq_idx, rc);
1175                         goto out;
1176                 }
1177         }
1178
1179         if (!list_empty(&rqset->set_requests)) {
1180                 LASSERT(rc == 0);
1181                 LASSERT(rqset->set_interpret == NULL);
1182                 rqset->set_interpret = lov_getattr_interpret;
1183                 rqset->set_arg = (void *)lovset;
1184                 return rc;
1185         }
1186 out:
1187         if (rc)
1188                 atomic_set(&lovset->set_completes, 0);
1189         err = lov_fini_getattr_set(lovset);
1190         return rc ? rc : err;
1191 }
1192
1193 static int lov_setattr_interpret(struct ptlrpc_request_set *rqset,
1194                                  void *data, int rc)
1195 {
1196         struct lov_request_set *lovset = (struct lov_request_set *)data;
1197         int err;
1198
1199         if (rc)
1200                 atomic_set(&lovset->set_completes, 0);
1201         err = lov_fini_setattr_set(lovset);
1202         return rc ? rc : err;
1203 }
1204
1205 /* If @oti is given, the request goes from MDS and responses from OSTs are not
1206    needed. Otherwise, a client is waiting for responses. */
1207 static int lov_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
1208                              struct obd_trans_info *oti,
1209                              struct ptlrpc_request_set *rqset)
1210 {
1211         struct lov_request_set *set;
1212         struct lov_request *req;
1213         struct list_head *pos;
1214         struct lov_obd *lov;
1215         int rc = 0;
1216
1217         LASSERT(oinfo);
1218         ASSERT_LSM_MAGIC(oinfo->oi_md);
1219         if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE) {
1220                 LASSERT(oti);
1221                 LASSERT(oti->oti_logcookies);
1222         }
1223
1224         if (!exp || !exp->exp_obd)
1225                 return -ENODEV;
1226
1227         lov = &exp->exp_obd->u.lov;
1228         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1229         if (rc)
1230                 return rc;
1231
1232         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1233                POSTID(&oinfo->oi_md->lsm_oi),
1234                oinfo->oi_md->lsm_stripe_count,
1235                oinfo->oi_md->lsm_stripe_size);
1236
1237         list_for_each(pos, &set->set_list) {
1238                 req = list_entry(pos, struct lov_request, rq_link);
1239
1240                 if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
1241                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1242
1243                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1244                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1245                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1246
1247                 rc = obd_setattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1248                                        &req->rq_oi, oti, rqset);
1249                 if (rc) {
1250                         CERROR("error: setattr objid "DOSTID" subobj"
1251                                DOSTID" on OST idx %d: rc = %d\n",
1252                                POSTID(&set->set_oi->oi_oa->o_oi),
1253                                POSTID(&req->rq_oi.oi_oa->o_oi),
1254                                req->rq_idx, rc);
1255                         break;
1256                 }
1257         }
1258
1259         /* If we are not waiting for responses on async requests, return. */
1260         if (rc || !rqset || list_empty(&rqset->set_requests)) {
1261                 int err;
1262
1263                 if (rc)
1264                         atomic_set(&set->set_completes, 0);
1265                 err = lov_fini_setattr_set(set);
1266                 return rc ? rc : err;
1267         }
1268
1269         LASSERT(rqset->set_interpret == NULL);
1270         rqset->set_interpret = lov_setattr_interpret;
1271         rqset->set_arg = (void *)set;
1272
1273         return 0;
1274 }
1275
1276 /* find any ldlm lock of the inode in lov
1277  * return 0    not find
1278  *      1    find one
1279  *      < 0    error */
1280 static int lov_find_cbdata(struct obd_export *exp,
1281                            struct lov_stripe_md *lsm, ldlm_iterator_t it,
1282                            void *data)
1283 {
1284         struct lov_obd *lov;
1285         int rc = 0, i;
1286
1287         ASSERT_LSM_MAGIC(lsm);
1288
1289         if (!exp || !exp->exp_obd)
1290                 return -ENODEV;
1291
1292         lov = &exp->exp_obd->u.lov;
1293         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1294                 struct lov_stripe_md submd;
1295                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1296
1297                 if (lov_oinfo_is_dummy(loi))
1298                         continue;
1299
1300                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1301                         CDEBUG(D_HA, "lov idx %d NULL\n", loi->loi_ost_idx);
1302                         continue;
1303                 }
1304
1305                 submd.lsm_oi = loi->loi_oi;
1306                 submd.lsm_stripe_count = 0;
1307                 rc = obd_find_cbdata(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1308                                      &submd, it, data);
1309                 if (rc != 0)
1310                         return rc;
1311         }
1312         return rc;
1313 }
1314
1315 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1316 {
1317         struct lov_request_set *lovset = (struct lov_request_set *)data;
1318         int err;
1319
1320         if (rc)
1321                 atomic_set(&lovset->set_completes, 0);
1322
1323         err = lov_fini_statfs_set(lovset);
1324         return rc ? rc : err;
1325 }
1326
1327 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
1328                             __u64 max_age, struct ptlrpc_request_set *rqset)
1329 {
1330         struct obd_device      *obd = class_exp2obd(exp);
1331         struct lov_request_set *set;
1332         struct lov_request *req;
1333         struct list_head *pos;
1334         struct lov_obd *lov;
1335         int rc = 0;
1336
1337         LASSERT(oinfo != NULL);
1338         LASSERT(oinfo->oi_osfs != NULL);
1339
1340         lov = &obd->u.lov;
1341         rc = lov_prep_statfs_set(obd, oinfo, &set);
1342         if (rc)
1343                 return rc;
1344
1345         list_for_each(pos, &set->set_list) {
1346                 req = list_entry(pos, struct lov_request, rq_link);
1347                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1348                                       &req->rq_oi, max_age, rqset);
1349                 if (rc)
1350                         break;
1351         }
1352
1353         if (rc || list_empty(&rqset->set_requests)) {
1354                 int err;
1355
1356                 if (rc)
1357                         atomic_set(&set->set_completes, 0);
1358                 err = lov_fini_statfs_set(set);
1359                 return rc ? rc : err;
1360         }
1361
1362         LASSERT(rqset->set_interpret == NULL);
1363         rqset->set_interpret = lov_statfs_interpret;
1364         rqset->set_arg = (void *)set;
1365         return 0;
1366 }
1367
1368 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1369                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1370 {
1371         struct ptlrpc_request_set *set = NULL;
1372         struct obd_info oinfo = { };
1373         int rc = 0;
1374
1375         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1376          * statfs requests */
1377         set = ptlrpc_prep_set();
1378         if (set == NULL)
1379                 return -ENOMEM;
1380
1381         oinfo.oi_osfs = osfs;
1382         oinfo.oi_flags = flags;
1383         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1384         if (rc == 0)
1385                 rc = ptlrpc_set_wait(set);
1386         ptlrpc_set_destroy(set);
1387
1388         return rc;
1389 }
1390
1391 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1392                          void *karg, void *uarg)
1393 {
1394         struct obd_device *obddev = class_exp2obd(exp);
1395         struct lov_obd *lov = &obddev->u.lov;
1396         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1397         struct obd_uuid *uuidp;
1398
1399         switch (cmd) {
1400         case IOC_OBD_STATFS: {
1401                 struct obd_ioctl_data *data = karg;
1402                 struct obd_device *osc_obd;
1403                 struct obd_statfs stat_buf = {0};
1404                 __u32 index;
1405                 __u32 flags;
1406
1407                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1408                 if (index >= count)
1409                         return -ENODEV;
1410
1411                 if (!lov->lov_tgts[index])
1412                         /* Try again with the next index */
1413                         return -EAGAIN;
1414                 if (!lov->lov_tgts[index]->ltd_active)
1415                         return -ENODATA;
1416
1417                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1418                 if (!osc_obd)
1419                         return -EINVAL;
1420
1421                 /* copy UUID */
1422                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1423                                      min((int) data->ioc_plen2,
1424                                          (int) sizeof(struct obd_uuid))))
1425                         return -EFAULT;
1426
1427                 flags = uarg ? *(__u32 *)uarg : 0;
1428                 /* got statfs data */
1429                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1430                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1431                                 flags);
1432                 if (rc)
1433                         return rc;
1434                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1435                                      min((int) data->ioc_plen1,
1436                                          (int) sizeof(stat_buf))))
1437                         return -EFAULT;
1438                 break;
1439         }
1440         case OBD_IOC_LOV_GET_CONFIG: {
1441                 struct obd_ioctl_data *data;
1442                 struct lov_desc *desc;
1443                 char *buf = NULL;
1444                 __u32 *genp;
1445
1446                 len = 0;
1447                 if (obd_ioctl_getdata(&buf, &len, uarg))
1448                         return -EINVAL;
1449
1450                 data = (struct obd_ioctl_data *)buf;
1451
1452                 if (sizeof(*desc) > data->ioc_inllen1) {
1453                         obd_ioctl_freedata(buf, len);
1454                         return -EINVAL;
1455                 }
1456
1457                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1458                         obd_ioctl_freedata(buf, len);
1459                         return -EINVAL;
1460                 }
1461
1462                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1463                         obd_ioctl_freedata(buf, len);
1464                         return -EINVAL;
1465                 }
1466
1467                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1468                 memcpy(desc, &(lov->desc), sizeof(*desc));
1469
1470                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1471                 genp = (__u32 *)data->ioc_inlbuf3;
1472                 /* the uuid will be empty for deleted OSTs */
1473                 for (i = 0; i < count; i++, uuidp++, genp++) {
1474                         if (!lov->lov_tgts[i])
1475                                 continue;
1476                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1477                         *genp = lov->lov_tgts[i]->ltd_gen;
1478                 }
1479
1480                 if (copy_to_user(uarg, buf, len))
1481                         rc = -EFAULT;
1482                 obd_ioctl_freedata(buf, len);
1483                 break;
1484         }
1485         case LL_IOC_LOV_GETSTRIPE:
1486                 rc = lov_getstripe(exp, karg, uarg);
1487                 break;
1488         case OBD_IOC_QUOTACTL: {
1489                 struct if_quotactl *qctl = karg;
1490                 struct lov_tgt_desc *tgt = NULL;
1491                 struct obd_quotactl *oqctl;
1492
1493                 if (qctl->qc_valid == QC_OSTIDX) {
1494                         if (count <= qctl->qc_idx)
1495                                 return -EINVAL;
1496
1497                         tgt = lov->lov_tgts[qctl->qc_idx];
1498                         if (!tgt || !tgt->ltd_exp)
1499                                 return -EINVAL;
1500                 } else if (qctl->qc_valid == QC_UUID) {
1501                         for (i = 0; i < count; i++) {
1502                                 tgt = lov->lov_tgts[i];
1503                                 if (!tgt ||
1504                                     !obd_uuid_equals(&tgt->ltd_uuid,
1505                                                      &qctl->obd_uuid))
1506                                         continue;
1507
1508                                 if (tgt->ltd_exp == NULL)
1509                                         return -EINVAL;
1510
1511                                 break;
1512                         }
1513                 } else {
1514                         return -EINVAL;
1515                 }
1516
1517                 if (i >= count)
1518                         return -EAGAIN;
1519
1520                 LASSERT(tgt && tgt->ltd_exp);
1521                 oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
1522                 if (!oqctl)
1523                         return -ENOMEM;
1524
1525                 QCTL_COPY(oqctl, qctl);
1526                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1527                 if (rc == 0) {
1528                         QCTL_COPY(qctl, oqctl);
1529                         qctl->qc_valid = QC_OSTIDX;
1530                         qctl->obd_uuid = tgt->ltd_uuid;
1531                 }
1532                 kfree(oqctl);
1533                 break;
1534         }
1535         default: {
1536                 int set = 0;
1537
1538                 if (count == 0)
1539                         return -ENOTTY;
1540
1541                 for (i = 0; i < count; i++) {
1542                         int err;
1543                         struct obd_device *osc_obd;
1544
1545                         /* OST was disconnected */
1546                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1547                                 continue;
1548
1549                         /* ll_umount_begin() sets force flag but for lov, not
1550                          * osc. Let's pass it through */
1551                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1552                         osc_obd->obd_force = obddev->obd_force;
1553                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1554                                             len, karg, uarg);
1555                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1556                                 return err;
1557                         } else if (err) {
1558                                 if (lov->lov_tgts[i]->ltd_active) {
1559                                         CDEBUG(err == -ENOTTY ?
1560                                                D_IOCTL : D_WARNING,
1561                                                "iocontrol OSC %s on OST idx %d cmd %x: err = %d\n",
1562                                                lov_uuid2str(lov, i),
1563                                                i, cmd, err);
1564                                         if (!rc)
1565                                                 rc = err;
1566                                 }
1567                         } else {
1568                                 set = 1;
1569                         }
1570                 }
1571                 if (!set && !rc)
1572                         rc = -EIO;
1573         }
1574         }
1575
1576         return rc;
1577 }
1578
1579 #define FIEMAP_BUFFER_SIZE 4096
1580
1581 /**
1582  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1583  * call. The local end offset and the device are sent in the first
1584  * fm_extent. This function calculates the stripe number from the index.
1585  * This function returns a stripe_no on which mapping is to be restarted.
1586  *
1587  * This function returns fm_end_offset which is the in-OST offset at which
1588  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1589  * will re-calculate proper offset in next stripe.
1590  * Note that the first extent is passed to lov_get_info via the value field.
1591  *
1592  * \param fiemap fiemap request header
1593  * \param lsm striping information for the file
1594  * \param fm_start logical start of mapping
1595  * \param fm_end logical end of mapping
1596  * \param start_stripe starting stripe will be returned in this
1597  */
1598 static u64 fiemap_calc_fm_end_offset(struct ll_user_fiemap *fiemap,
1599                                      struct lov_stripe_md *lsm, u64 fm_start,
1600                                      u64 fm_end, int *start_stripe)
1601 {
1602         u64 local_end = fiemap->fm_extents[0].fe_logical;
1603         u64 lun_start, lun_end;
1604         u64 fm_end_offset;
1605         int stripe_no = -1, i;
1606
1607         if (fiemap->fm_extent_count == 0 ||
1608             fiemap->fm_extents[0].fe_logical == 0)
1609                 return 0;
1610
1611         /* Find out stripe_no from ost_index saved in the fe_device */
1612         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1613                 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
1614
1615                 if (lov_oinfo_is_dummy(oinfo))
1616                         continue;
1617
1618                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1619                         stripe_no = i;
1620                         break;
1621                 }
1622         }
1623         if (stripe_no == -1)
1624                 return -EINVAL;
1625
1626         /* If we have finished mapping on previous device, shift logical
1627          * offset to start of next device */
1628         if ((lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
1629                                    &lun_start, &lun_end)) != 0 &&
1630                                    local_end < lun_end) {
1631                 fm_end_offset = local_end;
1632                 *start_stripe = stripe_no;
1633         } else {
1634                 /* This is a special value to indicate that caller should
1635                  * calculate offset in next stripe. */
1636                 fm_end_offset = 0;
1637                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
1638         }
1639
1640         return fm_end_offset;
1641 }
1642
1643 /**
1644  * We calculate on which OST the mapping will end. If the length of mapping
1645  * is greater than (stripe_size * stripe_count) then the last_stripe will
1646  * will be one just before start_stripe. Else we check if the mapping
1647  * intersects each OST and find last_stripe.
1648  * This function returns the last_stripe and also sets the stripe_count
1649  * over which the mapping is spread
1650  *
1651  * \param lsm striping information for the file
1652  * \param fm_start logical start of mapping
1653  * \param fm_end logical end of mapping
1654  * \param start_stripe starting stripe of the mapping
1655  * \param stripe_count the number of stripes across which to map is returned
1656  *
1657  * \retval last_stripe return the last stripe of the mapping
1658  */
1659 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, u64 fm_start,
1660                                    u64 fm_end, int start_stripe,
1661                                    int *stripe_count)
1662 {
1663         int last_stripe;
1664         u64 obd_start, obd_end;
1665         int i, j;
1666
1667         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
1668                 last_stripe = start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
1669                                                               start_stripe - 1;
1670                 *stripe_count = lsm->lsm_stripe_count;
1671         } else {
1672                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
1673                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
1674                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
1675                                                    &obd_start, &obd_end)) == 0)
1676                                 break;
1677                 }
1678                 *stripe_count = j;
1679                 last_stripe = (start_stripe + j - 1) % lsm->lsm_stripe_count;
1680         }
1681
1682         return last_stripe;
1683 }
1684
1685 /**
1686  * Set fe_device and copy extents from local buffer into main return buffer.
1687  *
1688  * \param fiemap fiemap request header
1689  * \param lcl_fm_ext array of local fiemap extents to be copied
1690  * \param ost_index OST index to be written into the fm_device field for each
1691                     extent
1692  * \param ext_count number of extents to be copied
1693  * \param current_extent where to start copying in main extent array
1694  */
1695 static void fiemap_prepare_and_copy_exts(struct ll_user_fiemap *fiemap,
1696                                          struct ll_fiemap_extent *lcl_fm_ext,
1697                                          int ost_index, unsigned int ext_count,
1698                                          int current_extent)
1699 {
1700         char *to;
1701         int ext;
1702
1703         for (ext = 0; ext < ext_count; ext++) {
1704                 lcl_fm_ext[ext].fe_device = ost_index;
1705                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1706         }
1707
1708         /* Copy fm_extent's from fm_local to return buffer */
1709         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1710         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct ll_fiemap_extent));
1711 }
1712
1713 /**
1714  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1715  * This also handles the restarting of FIEMAP calls in case mapping overflows
1716  * the available number of extents in single call.
1717  */
1718 static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
1719                       __u32 *vallen, void *val, struct lov_stripe_md *lsm)
1720 {
1721         struct ll_fiemap_info_key *fm_key = key;
1722         struct ll_user_fiemap *fiemap = val;
1723         struct ll_user_fiemap *fm_local = NULL;
1724         struct ll_fiemap_extent *lcl_fm_ext;
1725         int count_local;
1726         unsigned int get_num_extents = 0;
1727         int ost_index = 0, actual_start_stripe, start_stripe;
1728         u64 fm_start, fm_end, fm_length, fm_end_offset;
1729         u64 curr_loc;
1730         int current_extent = 0, rc = 0, i;
1731         int ost_eof = 0; /* EOF for object */
1732         int ost_done = 0; /* done with required mapping for this OST? */
1733         int last_stripe;
1734         int cur_stripe = 0, cur_stripe_wrap = 0, stripe_count;
1735         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1736
1737         if (!lsm_has_objects(lsm)) {
1738                 rc = 0;
1739                 goto out;
1740         }
1741
1742         if (fiemap_count_to_size(fm_key->fiemap.fm_extent_count) < buffer_size)
1743                 buffer_size = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
1744
1745         fm_local = libcfs_kvzalloc(buffer_size, GFP_NOFS);
1746         if (fm_local == NULL) {
1747                 rc = -ENOMEM;
1748                 goto out;
1749         }
1750         lcl_fm_ext = &fm_local->fm_extents[0];
1751
1752         count_local = fiemap_size_to_count(buffer_size);
1753
1754         memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
1755         fm_start = fiemap->fm_start;
1756         fm_length = fiemap->fm_length;
1757         /* Calculate start stripe, last stripe and length of mapping */
1758         actual_start_stripe = start_stripe = lov_stripe_number(lsm, fm_start);
1759         fm_end = (fm_length == ~0ULL ? fm_key->oa.o_size :
1760                                                 fm_start + fm_length - 1);
1761         /* If fm_length != ~0ULL but fm_start+fm_length-1 exceeds file size */
1762         if (fm_end > fm_key->oa.o_size)
1763                 fm_end = fm_key->oa.o_size;
1764
1765         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
1766                                             actual_start_stripe, &stripe_count);
1767
1768         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start,
1769                                                   fm_end, &start_stripe);
1770         if (fm_end_offset == -EINVAL) {
1771                 rc = -EINVAL;
1772                 goto out;
1773         }
1774
1775         if (fiemap_count_to_size(fiemap->fm_extent_count) > *vallen)
1776                 fiemap->fm_extent_count = fiemap_size_to_count(*vallen);
1777         if (fiemap->fm_extent_count == 0) {
1778                 get_num_extents = 1;
1779                 count_local = 0;
1780         }
1781         /* Check each stripe */
1782         for (cur_stripe = start_stripe, i = 0; i < stripe_count;
1783              i++, cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
1784                 u64 req_fm_len; /* Stores length of required mapping */
1785                 u64 len_mapped_single_call;
1786                 u64 lun_start, lun_end, obd_object_end;
1787                 unsigned int ext_count;
1788
1789                 cur_stripe_wrap = cur_stripe;
1790
1791                 /* Find out range of mapping on this stripe */
1792                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
1793                                            &lun_start, &obd_object_end)) == 0)
1794                         continue;
1795
1796                 if (lov_oinfo_is_dummy(lsm->lsm_oinfo[cur_stripe])) {
1797                         rc = -EIO;
1798                         goto out;
1799                 }
1800
1801                 /* If this is a continuation FIEMAP call and we are on
1802                  * starting stripe then lun_start needs to be set to
1803                  * fm_end_offset */
1804                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
1805                         lun_start = fm_end_offset;
1806
1807                 if (fm_length != ~0ULL) {
1808                         /* Handle fm_start + fm_length overflow */
1809                         if (fm_start + fm_length < fm_start)
1810                                 fm_length = ~0ULL - fm_start;
1811                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
1812                                                      cur_stripe);
1813                 } else {
1814                         lun_end = ~0ULL;
1815                 }
1816
1817                 if (lun_start == lun_end)
1818                         continue;
1819
1820                 req_fm_len = obd_object_end - lun_start;
1821                 fm_local->fm_length = 0;
1822                 len_mapped_single_call = 0;
1823
1824                 /* If the output buffer is very large and the objects have many
1825                  * extents we may need to loop on a single OST repeatedly */
1826                 ost_eof = 0;
1827                 ost_done = 0;
1828                 do {
1829                         if (get_num_extents == 0) {
1830                                 /* Don't get too many extents. */
1831                                 if (current_extent + count_local >
1832                                     fiemap->fm_extent_count)
1833                                         count_local = fiemap->fm_extent_count -
1834                                                                  current_extent;
1835                         }
1836
1837                         lun_start += len_mapped_single_call;
1838                         fm_local->fm_length = req_fm_len - len_mapped_single_call;
1839                         req_fm_len = fm_local->fm_length;
1840                         fm_local->fm_extent_count = count_local;
1841                         fm_local->fm_mapped_extents = 0;
1842                         fm_local->fm_flags = fiemap->fm_flags;
1843
1844                         fm_key->oa.o_oi = lsm->lsm_oinfo[cur_stripe]->loi_oi;
1845                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
1846
1847                         if (ost_index < 0 ||
1848                             ost_index >= lov->desc.ld_tgt_count) {
1849                                 rc = -EINVAL;
1850                                 goto out;
1851                         }
1852
1853                         /* If OST is inactive, return extent with UNKNOWN flag */
1854                         if (!lov->lov_tgts[ost_index]->ltd_active) {
1855                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
1856                                 fm_local->fm_mapped_extents = 1;
1857
1858                                 lcl_fm_ext[0].fe_logical = lun_start;
1859                                 lcl_fm_ext[0].fe_length = obd_object_end -
1860                                                                       lun_start;
1861                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1862
1863                                 goto inactive_tgt;
1864                         }
1865
1866                         fm_local->fm_start = lun_start;
1867                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1868                         memcpy(&fm_key->fiemap, fm_local, sizeof(*fm_local));
1869                         *vallen = fiemap_count_to_size(fm_local->fm_extent_count);
1870                         rc = obd_get_info(NULL,
1871                                           lov->lov_tgts[ost_index]->ltd_exp,
1872                                           keylen, key, vallen, fm_local, lsm);
1873                         if (rc != 0)
1874                                 goto out;
1875
1876 inactive_tgt:
1877                         ext_count = fm_local->fm_mapped_extents;
1878                         if (ext_count == 0) {
1879                                 ost_done = 1;
1880                                 /* If last stripe has hole at the end,
1881                                  * then we need to return */
1882                                 if (cur_stripe_wrap == last_stripe) {
1883                                         fiemap->fm_mapped_extents = 0;
1884                                         goto finish;
1885                                 }
1886                                 break;
1887                         }
1888
1889                         /* If we just need num of extents then go to next device */
1890                         if (get_num_extents) {
1891                                 current_extent += ext_count;
1892                                 break;
1893                         }
1894
1895                         len_mapped_single_call = lcl_fm_ext[ext_count-1].fe_logical -
1896                                   lun_start + lcl_fm_ext[ext_count - 1].fe_length;
1897
1898                         /* Have we finished mapping on this device? */
1899                         if (req_fm_len <= len_mapped_single_call)
1900                                 ost_done = 1;
1901
1902                         /* Clear the EXTENT_LAST flag which can be present on
1903                          * last extent */
1904                         if (lcl_fm_ext[ext_count-1].fe_flags & FIEMAP_EXTENT_LAST)
1905                                 lcl_fm_ext[ext_count - 1].fe_flags &=
1906                                                             ~FIEMAP_EXTENT_LAST;
1907
1908                         curr_loc = lov_stripe_size(lsm,
1909                                            lcl_fm_ext[ext_count - 1].fe_logical+
1910                                            lcl_fm_ext[ext_count - 1].fe_length,
1911                                            cur_stripe);
1912                         if (curr_loc >= fm_key->oa.o_size)
1913                                 ost_eof = 1;
1914
1915                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
1916                                                      ost_index, ext_count,
1917                                                      current_extent);
1918
1919                         current_extent += ext_count;
1920
1921                         /* Ran out of available extents? */
1922                         if (current_extent >= fiemap->fm_extent_count)
1923                                 goto finish;
1924                 } while (ost_done == 0 && ost_eof == 0);
1925
1926                 if (cur_stripe_wrap == last_stripe)
1927                         goto finish;
1928         }
1929
1930 finish:
1931         /* Indicate that we are returning device offsets unless file just has
1932          * single stripe */
1933         if (lsm->lsm_stripe_count > 1)
1934                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1935
1936         if (get_num_extents)
1937                 goto skip_last_device_calc;
1938
1939         /* Check if we have reached the last stripe and whether mapping for that
1940          * stripe is done. */
1941         if (cur_stripe_wrap == last_stripe) {
1942                 if (ost_done || ost_eof)
1943                         fiemap->fm_extents[current_extent - 1].fe_flags |=
1944                                                              FIEMAP_EXTENT_LAST;
1945         }
1946
1947 skip_last_device_calc:
1948         fiemap->fm_mapped_extents = current_extent;
1949
1950 out:
1951         kvfree(fm_local);
1952         return rc;
1953 }
1954
1955 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1956                         __u32 keylen, void *key, __u32 *vallen, void *val,
1957                         struct lov_stripe_md *lsm)
1958 {
1959         struct obd_device *obddev = class_exp2obd(exp);
1960         struct lov_obd *lov = &obddev->u.lov;
1961         int i, rc;
1962
1963         if (!vallen || !val)
1964                 return -EFAULT;
1965
1966         obd_getref(obddev);
1967
1968         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
1969                 struct {
1970                         char name[16];
1971                         struct ldlm_lock *lock;
1972                 } *data = key;
1973                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
1974                 struct lov_oinfo *loi;
1975                 __u32 *stripe = val;
1976
1977                 if (*vallen < sizeof(*stripe)) {
1978                         rc = -EFAULT;
1979                         goto out;
1980                 }
1981                 *vallen = sizeof(*stripe);
1982
1983                 /* XXX This is another one of those bits that will need to
1984                  * change if we ever actually support nested LOVs.  It uses
1985                  * the lock's export to find out which stripe it is. */
1986                 /* XXX - it's assumed all the locks for deleted OSTs have
1987                  * been cancelled. Also, the export for deleted OSTs will
1988                  * be NULL and won't match the lock's export. */
1989                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
1990                         loi = lsm->lsm_oinfo[i];
1991                         if (lov_oinfo_is_dummy(loi))
1992                                 continue;
1993
1994                         if (!lov->lov_tgts[loi->loi_ost_idx])
1995                                 continue;
1996                         if (lov->lov_tgts[loi->loi_ost_idx]->ltd_exp ==
1997                             data->lock->l_conn_export &&
1998                             ostid_res_name_eq(&loi->loi_oi, res_id)) {
1999                                 *stripe = i;
2000                                 rc = 0;
2001                                 goto out;
2002                         }
2003                 }
2004                 LDLM_ERROR(data->lock, "lock on inode without such object");
2005                 dump_lsm(D_ERROR, lsm);
2006                 rc = -ENXIO;
2007                 goto out;
2008         } else if (KEY_IS(KEY_LAST_ID)) {
2009                 struct obd_id_info *info = val;
2010                 __u32 size = sizeof(u64);
2011                 struct lov_tgt_desc *tgt;
2012
2013                 LASSERT(*vallen == sizeof(struct obd_id_info));
2014                 tgt = lov->lov_tgts[info->idx];
2015
2016                 if (!tgt || !tgt->ltd_active) {
2017                         rc = -ESRCH;
2018                         goto out;
2019                 }
2020
2021                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
2022                                   &size, info->data, NULL);
2023                 rc = 0;
2024                 goto out;
2025         } else if (KEY_IS(KEY_LOVDESC)) {
2026                 struct lov_desc *desc_ret = val;
2027                 *desc_ret = lov->desc;
2028
2029                 rc = 0;
2030                 goto out;
2031         } else if (KEY_IS(KEY_FIEMAP)) {
2032                 rc = lov_fiemap(lov, keylen, key, vallen, val, lsm);
2033                 goto out;
2034         } else if (KEY_IS(KEY_CONNECT_FLAG)) {
2035                 struct lov_tgt_desc *tgt;
2036                 __u64 ost_idx = *((__u64 *)val);
2037
2038                 LASSERT(*vallen == sizeof(__u64));
2039                 LASSERT(ost_idx < lov->desc.ld_tgt_count);
2040                 tgt = lov->lov_tgts[ost_idx];
2041
2042                 if (!tgt || !tgt->ltd_exp) {
2043                         rc = -ESRCH;
2044                         goto out;
2045                 }
2046
2047                 *((__u64 *)val) = exp_connect_flags(tgt->ltd_exp);
2048                 rc = 0;
2049                 goto out;
2050         } else if (KEY_IS(KEY_TGT_COUNT)) {
2051                 *((int *)val) = lov->desc.ld_tgt_count;
2052                 rc = 0;
2053                 goto out;
2054         }
2055
2056         rc = -EINVAL;
2057
2058 out:
2059         obd_putref(obddev);
2060         return rc;
2061 }
2062
2063 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
2064                               u32 keylen, void *key, u32 vallen,
2065                               void *val, struct ptlrpc_request_set *set)
2066 {
2067         struct obd_device *obddev = class_exp2obd(exp);
2068         struct lov_obd *lov = &obddev->u.lov;
2069         u32 count;
2070         int i, rc = 0, err;
2071         struct lov_tgt_desc *tgt;
2072         unsigned incr, check_uuid,
2073                  do_inactive, no_set;
2074         unsigned next_id = 0,  mds_con = 0;
2075
2076         incr = check_uuid = do_inactive = no_set = 0;
2077         if (set == NULL) {
2078                 no_set = 1;
2079                 set = ptlrpc_prep_set();
2080                 if (!set)
2081                         return -ENOMEM;
2082         }
2083
2084         obd_getref(obddev);
2085         count = lov->desc.ld_tgt_count;
2086
2087         if (KEY_IS(KEY_NEXT_ID)) {
2088                 count = vallen / sizeof(struct obd_id_info);
2089                 vallen = sizeof(u64);
2090                 incr = sizeof(struct obd_id_info);
2091                 do_inactive = 1;
2092                 next_id = 1;
2093         } else if (KEY_IS(KEY_CHECKSUM)) {
2094                 do_inactive = 1;
2095         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2096                 /* use defaults:  do_inactive = incr = 0; */
2097         } else if (KEY_IS(KEY_MDS_CONN)) {
2098                 mds_con = 1;
2099         } else if (KEY_IS(KEY_CACHE_SET)) {
2100                 LASSERT(lov->lov_cache == NULL);
2101                 lov->lov_cache = val;
2102                 do_inactive = 1;
2103         }
2104
2105         for (i = 0; i < count; i++, val = (char *)val + incr) {
2106                 if (next_id) {
2107                         tgt = lov->lov_tgts[((struct obd_id_info *)val)->idx];
2108                 } else {
2109                         tgt = lov->lov_tgts[i];
2110                 }
2111                 /* OST was disconnected */
2112                 if (!tgt || !tgt->ltd_exp)
2113                         continue;
2114
2115                 /* OST is inactive and we don't want inactive OSCs */
2116                 if (!tgt->ltd_active && !do_inactive)
2117                         continue;
2118
2119                 if (mds_con) {
2120                         struct mds_group_info *mgi;
2121
2122                         LASSERT(vallen == sizeof(*mgi));
2123                         mgi = (struct mds_group_info *)val;
2124
2125                         /* Only want a specific OSC */
2126                         if (mgi->uuid && !obd_uuid_equals(mgi->uuid,
2127                                                 &tgt->ltd_uuid))
2128                                 continue;
2129
2130                         err = obd_set_info_async(env, tgt->ltd_exp,
2131                                          keylen, key, sizeof(int),
2132                                          &mgi->group, set);
2133                 } else if (next_id) {
2134                         err = obd_set_info_async(env, tgt->ltd_exp,
2135                                          keylen, key, vallen,
2136                                          ((struct obd_id_info *)val)->data, set);
2137                 } else {
2138                         /* Only want a specific OSC */
2139                         if (check_uuid &&
2140                             !obd_uuid_equals(val, &tgt->ltd_uuid))
2141                                 continue;
2142
2143                         err = obd_set_info_async(env, tgt->ltd_exp,
2144                                          keylen, key, vallen, val, set);
2145                 }
2146
2147                 if (!rc)
2148                         rc = err;
2149         }
2150
2151         obd_putref(obddev);
2152         if (no_set) {
2153                 err = ptlrpc_set_wait(set);
2154                 if (!rc)
2155                         rc = err;
2156                 ptlrpc_set_destroy(set);
2157         }
2158         return rc;
2159 }
2160
2161 void lov_stripe_lock(struct lov_stripe_md *md)
2162                 __acquires(&md->lsm_lock)
2163 {
2164         LASSERT(md->lsm_lock_owner != current_pid());
2165         spin_lock(&md->lsm_lock);
2166         LASSERT(md->lsm_lock_owner == 0);
2167         md->lsm_lock_owner = current_pid();
2168 }
2169 EXPORT_SYMBOL(lov_stripe_lock);
2170
2171 void lov_stripe_unlock(struct lov_stripe_md *md)
2172                 __releases(&md->lsm_lock)
2173 {
2174         LASSERT(md->lsm_lock_owner == current_pid());
2175         md->lsm_lock_owner = 0;
2176         spin_unlock(&md->lsm_lock);
2177 }
2178 EXPORT_SYMBOL(lov_stripe_unlock);
2179
2180 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
2181                         struct obd_quotactl *oqctl)
2182 {
2183         struct lov_obd      *lov = &obd->u.lov;
2184         struct lov_tgt_desc *tgt;
2185         __u64           curspace = 0;
2186         __u64           bhardlimit = 0;
2187         int               i, rc = 0;
2188
2189         if (oqctl->qc_cmd != LUSTRE_Q_QUOTAON &&
2190             oqctl->qc_cmd != LUSTRE_Q_QUOTAOFF &&
2191             oqctl->qc_cmd != Q_GETOQUOTA &&
2192             oqctl->qc_cmd != Q_INITQUOTA &&
2193             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA &&
2194             oqctl->qc_cmd != Q_FINVALIDATE) {
2195                 CERROR("bad quota opc %x for lov obd", oqctl->qc_cmd);
2196                 return -EFAULT;
2197         }
2198
2199         /* for lov tgt */
2200         obd_getref(obd);
2201         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2202                 int err;
2203
2204                 tgt = lov->lov_tgts[i];
2205
2206                 if (!tgt)
2207                         continue;
2208
2209                 if (!tgt->ltd_active || tgt->ltd_reap) {
2210                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
2211                             lov->lov_tgts[i]->ltd_activate) {
2212                                 rc = -EREMOTEIO;
2213                                 CERROR("ost %d is inactive\n", i);
2214                         } else {
2215                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
2216                         }
2217                         continue;
2218                 }
2219
2220                 err = obd_quotactl(tgt->ltd_exp, oqctl);
2221                 if (err) {
2222                         if (tgt->ltd_active && !rc)
2223                                 rc = err;
2224                         continue;
2225                 }
2226
2227                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
2228                         curspace += oqctl->qc_dqblk.dqb_curspace;
2229                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
2230                 }
2231         }
2232         obd_putref(obd);
2233
2234         if (oqctl->qc_cmd == Q_GETOQUOTA) {
2235                 oqctl->qc_dqblk.dqb_curspace = curspace;
2236                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
2237         }
2238         return rc;
2239 }
2240
2241 static int lov_quotacheck(struct obd_device *obd, struct obd_export *exp,
2242                           struct obd_quotactl *oqctl)
2243 {
2244         struct lov_obd *lov = &obd->u.lov;
2245         int          i, rc = 0;
2246
2247         obd_getref(obd);
2248
2249         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2250                 if (!lov->lov_tgts[i])
2251                         continue;
2252
2253                 /* Skip quota check on the administratively disabled OSTs. */
2254                 if (!lov->lov_tgts[i]->ltd_activate) {
2255                         CWARN("lov idx %d was administratively disabled, skip quotacheck on it.\n",
2256                               i);
2257                         continue;
2258                 }
2259
2260                 if (!lov->lov_tgts[i]->ltd_active) {
2261                         CERROR("lov idx %d inactive\n", i);
2262                         rc = -EIO;
2263                         goto out;
2264                 }
2265         }
2266
2267         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2268                 int err;
2269
2270                 if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_activate)
2271                         continue;
2272
2273                 err = obd_quotacheck(lov->lov_tgts[i]->ltd_exp, oqctl);
2274                 if (err && !rc)
2275                         rc = err;
2276         }
2277
2278 out:
2279         obd_putref(obd);
2280
2281         return rc;
2282 }
2283
2284 static struct obd_ops lov_obd_ops = {
2285         .o_owner               = THIS_MODULE,
2286         .o_setup               = lov_setup,
2287         .o_precleanup     = lov_precleanup,
2288         .o_cleanup           = lov_cleanup,
2289         /*.o_process_config      = lov_process_config,*/
2290         .o_connect           = lov_connect,
2291         .o_disconnect     = lov_disconnect,
2292         .o_statfs             = lov_statfs,
2293         .o_statfs_async = lov_statfs_async,
2294         .o_packmd             = lov_packmd,
2295         .o_unpackmd         = lov_unpackmd,
2296         .o_create             = lov_create,
2297         .o_destroy           = lov_destroy,
2298         .o_getattr_async       = lov_getattr_async,
2299         .o_setattr_async       = lov_setattr_async,
2300         .o_adjust_kms     = lov_adjust_kms,
2301         .o_find_cbdata   = lov_find_cbdata,
2302         .o_iocontrol       = lov_iocontrol,
2303         .o_get_info         = lov_get_info,
2304         .o_set_info_async      = lov_set_info_async,
2305         .o_notify             = lov_notify,
2306         .o_pool_new         = lov_pool_new,
2307         .o_pool_rem         = lov_pool_remove,
2308         .o_pool_add         = lov_pool_add,
2309         .o_pool_del         = lov_pool_del,
2310         .o_getref             = lov_getref,
2311         .o_putref             = lov_putref,
2312         .o_quotactl         = lov_quotactl,
2313         .o_quotacheck     = lov_quotacheck,
2314 };
2315
2316 struct kmem_cache *lov_oinfo_slab;
2317
2318 static int __init lov_init(void)
2319 {
2320         struct lprocfs_static_vars lvars = { NULL };
2321         int rc;
2322
2323         /* print an address of _any_ initialized kernel symbol from this
2324          * module, to allow debugging with gdb that doesn't support data
2325          * symbols from modules.*/
2326         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
2327
2328         rc = lu_kmem_init(lov_caches);
2329         if (rc)
2330                 return rc;
2331
2332         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
2333                                               sizeof(struct lov_oinfo),
2334                                               0, SLAB_HWCACHE_ALIGN, NULL);
2335         if (lov_oinfo_slab == NULL) {
2336                 lu_kmem_fini(lov_caches);
2337                 return -ENOMEM;
2338         }
2339         lprocfs_lov_init_vars(&lvars);
2340
2341         rc = class_register_type(&lov_obd_ops, NULL,
2342                                  LUSTRE_LOV_NAME, &lov_device_type);
2343
2344         if (rc) {
2345                 kmem_cache_destroy(lov_oinfo_slab);
2346                 lu_kmem_fini(lov_caches);
2347         }
2348
2349         return rc;
2350 }
2351
2352 static void /*__exit*/ lov_exit(void)
2353 {
2354         class_unregister_type(LUSTRE_LOV_NAME);
2355         kmem_cache_destroy(lov_oinfo_slab);
2356
2357         lu_kmem_fini(lov_caches);
2358 }
2359
2360 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2361 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
2362 MODULE_LICENSE("GPL");
2363 MODULE_VERSION(LUSTRE_VERSION_STRING);
2364
2365 module_init(lov_init);
2366 module_exit(lov_exit);