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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/lov/lov_obd.c
  33  *
  34  * Author: Phil Schwan <phil@clusterfs.com>
  35  * Author: Peter Braam <braam@clusterfs.com>
  36  * Author: Mike Shaver <shaver@clusterfs.com>
  37  * Author: Nathan Rutman <nathan@clusterfs.com>
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_LOV
  41 #include <libcfs/libcfs.h>
  42
  43 #include <lustre/lustre_idl.h>
  44
  45 #include <cl_object.h>
  46 #include <lustre_dlm.h>
  47 #include <lustre_fid.h>
  48 #include <lustre_ioctl.h>
  49 #include <lustre_lib.h>
  50 #include <lustre_mds.h>
  51 #include <lustre_net.h>
  52 #include <lustre_param.h>
  53 #include <lustre_swab.h>
  54 #include <lprocfs_status.h>
  55 #include <obd_class.h>
  56 #include <obd_support.h>
  57
  58 #include "lov_internal.h"
  59
  60 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  61    Any function that expects lov_tgts to remain stationary must take a ref. */
  62 static void lov_getref(struct obd_device *obd)
  63 {
  64         struct lov_obd *lov = &obd->u.lov;
  65
  66         /* nobody gets through here until lov_putref is done */
  67         mutex_lock(&lov->lov_lock);
  68         atomic_inc(&lov->lov_refcount);
  69         mutex_unlock(&lov->lov_lock);
  70         return;
  71 }
  72
  73 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  74
  75 static void lov_putref(struct obd_device *obd)
  76 {
  77         struct lov_obd *lov = &obd->u.lov;
  78
  79         mutex_lock(&lov->lov_lock);
  80         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  81         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  82                 struct list_head kill = LIST_HEAD_INIT(kill);
  83                 struct lov_tgt_desc *tgt, *n;
  84                 int i;
  85
  86                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  87                        lov->lov_death_row);
  88                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  89                         tgt = lov->lov_tgts[i];
  90
  91                         if (!tgt || !tgt->ltd_reap)
  92                                 continue;
  93                         list_add(&tgt->ltd_kill, &kill);
  94                         /* XXX - right now there is a dependency on ld_tgt_count
  95                          * being the maximum tgt index for computing the
  96                          * mds_max_easize. So we can't shrink it. */
  97                         lov_ost_pool_remove(&lov->lov_packed, i);
  98                         lov->lov_tgts[i] = NULL;
  99                         lov->lov_death_row--;
 100                 }
 101                 mutex_unlock(&lov->lov_lock);
 102
 103                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 104                         list_del(&tgt->ltd_kill);
 105                         /* Disconnect */
 106                         __lov_del_obd(obd, tgt);
 107                 }
 108         } else {
 109                 mutex_unlock(&lov->lov_lock);
 110         }
 111 }
 112
 113 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 114                               enum obd_notify_event ev);
 115 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 116                       enum obd_notify_event ev, void *data);
 117
 118 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 119                     struct obd_connect_data *data)
 120 {
 121         struct lov_obd *lov = &obd->u.lov;
 122         struct obd_uuid *tgt_uuid;
 123         struct obd_device *tgt_obd;
 124         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 125         struct obd_import *imp;
 126         int rc;
 127         ENTRY;
 128
 129         if (lov->lov_tgts[index] == NULL)
 130                 RETURN(-EINVAL);
 131
 132         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 133         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 134
 135         if (!tgt_obd->obd_set_up) {
 136                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 137                 RETURN(-EINVAL);
 138         }
 139
 140         /* override the sp_me from lov */
 141         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 142
 143         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 144                 data->ocd_index = index;
 145
 146         /*
 147          * Divine LOV knows that OBDs under it are OSCs.
 148          */
 149         imp = tgt_obd->u.cli.cl_import;
 150
 151         if (activate) {
 152                 tgt_obd->obd_no_recov = 0;
 153                 /* FIXME this is probably supposed to be
 154                    ptlrpc_set_import_active.  Horrible naming. */
 155                 ptlrpc_activate_import(imp);
 156         }
 157
 158         rc = obd_register_observer(tgt_obd, obd);
 159         if (rc) {
 160                 CERROR("Target %s register_observer error %d\n",
 161                        obd_uuid2str(tgt_uuid), rc);
 162                 RETURN(rc);
 163         }
 164
 165
 166         if (imp->imp_invalid) {
 167                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively "
 168                        "disabled\n", obd_uuid2str(tgt_uuid));
 169                 RETURN(0);
 170         }
 171
 172         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 173                          &lov_osc_uuid, data, NULL);
 174         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 175                 CERROR("Target %s connect error %d\n",
 176                        obd_uuid2str(tgt_uuid), rc);
 177                 RETURN(-ENODEV);
 178         }
 179
 180         lov->lov_tgts[index]->ltd_reap = 0;
 181
 182         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 183                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 184
 185         if (lov->targets_proc_entry != NULL) {
 186                 struct proc_dir_entry *osc_symlink;
 187                 struct obd_device *osc_obd;
 188
 189                 osc_obd = lov->lov_tgts[index]->ltd_exp->exp_obd;
 190
 191                 LASSERT(osc_obd != NULL);
 192                 LASSERT(osc_obd->obd_magic == OBD_DEVICE_MAGIC);
 193                 LASSERT(osc_obd->obd_type->typ_name != NULL);
 194
 195                 osc_symlink = lprocfs_add_symlink(osc_obd->obd_name,
 196                                                   lov->targets_proc_entry,
 197                                                   "../../../%s/%s",
 198                                                   osc_obd->obd_type->typ_name,
 199                                                   osc_obd->obd_name);
 200                 if (osc_symlink == NULL) {
 201                         CERROR("cannot register LOV target "
 202                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 203                                obd->obd_type->typ_name, obd->obd_name,
 204                                osc_obd->obd_name);
 205                 }
 206         }
 207         RETURN(0);
 208 }
 209
 210 static int lov_connect(const struct lu_env *env,
 211                        struct obd_export **exp, struct obd_device *obd,
 212                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 213                        void *localdata)
 214 {
 215         struct lov_obd *lov = &obd->u.lov;
 216         struct lov_tgt_desc *tgt;
 217         struct lustre_handle conn;
 218         int i, rc;
 219         ENTRY;
 220
 221         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 222
 223         rc = class_connect(&conn, obd, cluuid);
 224         if (rc)
 225                 RETURN(rc);
 226
 227         *exp = class_conn2export(&conn);
 228
 229         /* Why should there ever be more than 1 connect? */
 230         lov->lov_connects++;
 231         LASSERT(lov->lov_connects == 1);
 232
 233         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 234         if (data)
 235                 lov->lov_ocd = *data;
 236
 237         lov->targets_proc_entry = lprocfs_register("target_obds",
 238                                                    obd->obd_proc_entry,
 239                                                    NULL, NULL);
 240         if (IS_ERR(lov->targets_proc_entry)) {
 241                 CERROR("%s: cannot register "
 242                        "/proc/fs/lustre/%s/%s/target_obds\n",
 243                        obd->obd_name, obd->obd_type->typ_name, obd->obd_name);
 244                 lov->targets_proc_entry = NULL;
 245         }
 246
 247         obd_getref(obd);
 248         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 249                 tgt = lov->lov_tgts[i];
 250                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 251                         continue;
 252                 /* Flags will be lowest common denominator */
 253                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 254                 if (rc) {
 255                         CERROR("%s: lov connect tgt %d failed: %d\n",
 256                                obd->obd_name, i, rc);
 257                         continue;
 258                 }
 259                 /* connect to administrative disabled ost */
 260                 if (!lov->lov_tgts[i]->ltd_exp)
 261                         continue;
 262
 263                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 264                                 OBD_NOTIFY_CONNECT, (void *)&i);
 265                 if (rc) {
 266                         CERROR("%s error sending notify %d\n",
 267                                obd->obd_name, rc);
 268                 }
 269         }
 270         obd_putref(obd);
 271
 272         RETURN(0);
 273 }
 274
 275 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 276 {
 277         struct lov_obd *lov = &obd->u.lov;
 278         struct obd_device *osc_obd;
 279         int rc;
 280         ENTRY;
 281
 282         osc_obd = class_exp2obd(tgt->ltd_exp);
 283         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 284                obd->obd_name, osc_obd->obd_name);
 285
 286         if (tgt->ltd_active) {
 287                 tgt->ltd_active = 0;
 288                 lov->desc.ld_active_tgt_count--;
 289                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 290         }
 291
 292         if (osc_obd) {
 293                 /* Pass it on to our clients.
 294                  * XXX This should be an argument to disconnect,
 295                  * XXX not a back-door flag on the OBD.  Ah well.
 296                  */
 297                 osc_obd->obd_force = obd->obd_force;
 298                 osc_obd->obd_fail = obd->obd_fail;
 299                 osc_obd->obd_no_recov = obd->obd_no_recov;
 300
 301                 if (lov->targets_proc_entry != NULL)
 302                         lprocfs_remove_proc_entry(osc_obd->obd_name,
 303                                                   lov->targets_proc_entry);
 304         }
 305
 306         obd_register_observer(osc_obd, NULL);
 307
 308         rc = obd_disconnect(tgt->ltd_exp);
 309         if (rc) {
 310                 CERROR("Target %s disconnect error %d\n",
 311                        tgt->ltd_uuid.uuid, rc);
 312                 rc = 0;
 313         }
 314
 315         tgt->ltd_exp = NULL;
 316         RETURN(0);
 317 }
 318
 319 static int lov_disconnect(struct obd_export *exp)
 320 {
 321         struct obd_device *obd = class_exp2obd(exp);
 322         struct lov_obd *lov = &obd->u.lov;
 323         int i, rc;
 324         ENTRY;
 325
 326         if (!lov->lov_tgts)
 327                 goto out;
 328
 329         /* Only disconnect the underlying layers on the final disconnect. */
 330         lov->lov_connects--;
 331         if (lov->lov_connects != 0) {
 332                 /* why should there be more than 1 connect? */
 333                 CERROR("disconnect #%d\n", lov->lov_connects);
 334                 goto out;
 335         }
 336
 337         /* Let's hold another reference so lov_del_obd doesn't spin through
 338            putref every time */
 339         obd_getref(obd);
 340
 341         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 342                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 343                         /* Disconnection is the last we know about an obd */
 344                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
 345                 }
 346         }
 347         obd_putref(obd);
 348
 349         if (lov->targets_proc_entry != NULL)
 350                 lprocfs_remove(&lov->targets_proc_entry);
 351
 352 out:
 353         rc = class_disconnect(exp); /* bz 9811 */
 354         RETURN(rc);
 355 }
 356
 357 /* Error codes:
 358  *
 359  *  -EINVAL  : UUID can't be found in the LOV's target list
 360  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 361  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 362  *  any >= 0 : is log target index
 363  */
 364 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 365                               enum obd_notify_event ev)
 366 {
 367         struct lov_obd *lov = &obd->u.lov;
 368         struct lov_tgt_desc *tgt;
 369         int index, activate, active;
 370         ENTRY;
 371
 372         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 373                lov, uuid->uuid, ev);
 374
 375         obd_getref(obd);
 376         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 377                 tgt = lov->lov_tgts[index];
 378                 if (!tgt)
 379                         continue;
 380                 /*
 381                  * LU-642, initially inactive OSC could miss the obd_connect,
 382                  * we make up for it here.
 383                  */
 384                 if (ev == OBD_NOTIFY_ACTIVATE && tgt->ltd_exp == NULL &&
 385                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 386                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 387
 388                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 389                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 390                 }
 391                 if (!tgt->ltd_exp)
 392                         continue;
 393
 394                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 395                        index, obd_uuid2str(&tgt->ltd_uuid),
 396                        tgt->ltd_exp->exp_handle.h_cookie);
 397                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 398                         break;
 399         }
 400
 401         if (index == lov->desc.ld_tgt_count)
 402                 GOTO(out, index = -EINVAL);
 403
 404         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 405                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 406
 407                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 408                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 409                                uuid->uuid, activate ? "" : "de");
 410                 } else {
 411                         lov->lov_tgts[index]->ltd_activate = activate;
 412                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 413                                activate ? "" : "de", obd_uuid2str(uuid));
 414                 }
 415
 416         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 417                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 418
 419                 if (lov->lov_tgts[index]->ltd_active == active) {
 420                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 421                                uuid->uuid, active ? "" : "in");
 422                         GOTO(out, index);
 423                 } else {
 424                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 425                                obd_uuid2str(uuid), active ? "" : "in");
 426                 }
 427
 428                 lov->lov_tgts[index]->ltd_active = active;
 429                 if (active) {
 430                         lov->desc.ld_active_tgt_count++;
 431                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 432                 } else {
 433                         lov->desc.ld_active_tgt_count--;
 434                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 435                 }
 436         } else {
 437                 CERROR("%s: unknown event %d for uuid %s\n", obd->obd_name,
 438                        ev, uuid->uuid);
 439         }
 440
 441  out:
 442         obd_putref(obd);
 443         RETURN(index);
 444 }
 445
 446 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 447                       enum obd_notify_event ev, void *data)
 448 {
 449         int rc = 0;
 450         struct lov_obd *lov = &obd->u.lov;
 451         ENTRY;
 452
 453         down_read(&lov->lov_notify_lock);
 454         if (!lov->lov_connects)
 455                 GOTO(out_notify_lock, rc = 0);
 456
 457         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 458             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 459                 struct obd_uuid *uuid;
 460
 461                 LASSERT(watched);
 462
 463                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 464                         CERROR("unexpected notification of %s %s\n",
 465                                watched->obd_type->typ_name, watched->obd_name);
 466                         GOTO(out_notify_lock, rc = -EINVAL);
 467                 }
 468
 469                 uuid = &watched->u.cli.cl_target_uuid;
 470
 471                 /* Set OSC as active before notifying the observer, so the
 472                  * observer can use the OSC normally.
 473                  */
 474                 rc = lov_set_osc_active(obd, uuid, ev);
 475                 if (rc < 0) {
 476                         CERROR("%s: event %d failed: rc = %d\n", obd->obd_name,
 477                                ev, rc);
 478                         GOTO(out_notify_lock, rc);
 479                 }
 480
 481                 /* active event should be pass lov target index as data */
 482                 data = &rc;
 483         }
 484
 485         /* Pass the notification up the chain. */
 486         rc = obd_notify_observer(obd, watched, ev, data);
 487
 488 out_notify_lock:
 489         up_read(&lov->lov_notify_lock);
 490
 491         RETURN(rc);
 492 }
 493
 494 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 495                           __u32 index, int gen, int active)
 496 {
 497         struct lov_obd *lov = &obd->u.lov;
 498         struct lov_tgt_desc *tgt;
 499         struct obd_device *tgt_obd;
 500         int rc;
 501         ENTRY;
 502
 503         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 504                uuidp->uuid, index, gen, active);
 505
 506         if (gen <= 0) {
 507                 CERROR("request to add OBD %s with invalid generation: %d\n",
 508                        uuidp->uuid, gen);
 509                 RETURN(-EINVAL);
 510         }
 511
 512         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 513                                         &obd->obd_uuid);
 514         if (tgt_obd == NULL)
 515                 RETURN(-EINVAL);
 516
 517         mutex_lock(&lov->lov_lock);
 518
 519         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 520                 tgt = lov->lov_tgts[index];
 521                 CERROR("UUID %s already assigned at LOV target index %d\n",
 522                        obd_uuid2str(&tgt->ltd_uuid), index);
 523                 mutex_unlock(&lov->lov_lock);
 524                 RETURN(-EEXIST);
 525         }
 526
 527         if (index >= lov->lov_tgt_size) {
 528                 /* We need to reallocate the lov target array. */
 529                 struct lov_tgt_desc **newtgts, **old = NULL;
 530                 __u32 newsize, oldsize = 0;
 531
 532                 newsize = max(lov->lov_tgt_size, (__u32)2);
 533                 while (newsize < index + 1)
 534                         newsize = newsize << 1;
 535                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 536                 if (newtgts == NULL) {
 537                         mutex_unlock(&lov->lov_lock);
 538                         RETURN(-ENOMEM);
 539                 }
 540
 541                 if (lov->lov_tgt_size) {
 542                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 543                                lov->lov_tgt_size);
 544                         old = lov->lov_tgts;
 545                         oldsize = lov->lov_tgt_size;
 546                 }
 547
 548                 lov->lov_tgts = newtgts;
 549                 lov->lov_tgt_size = newsize;
 550                 smp_rmb();
 551                 if (old)
 552                         OBD_FREE(old, sizeof(*old) * oldsize);
 553
 554                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 555                        lov->lov_tgts, lov->lov_tgt_size);
 556         }
 557
 558         OBD_ALLOC_PTR(tgt);
 559         if (!tgt) {
 560                 mutex_unlock(&lov->lov_lock);
 561                 RETURN(-ENOMEM);
 562         }
 563
 564         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 565         if (rc) {
 566                 mutex_unlock(&lov->lov_lock);
 567                 OBD_FREE_PTR(tgt);
 568                 RETURN(rc);
 569         }
 570
 571         tgt->ltd_uuid = *uuidp;
 572         tgt->ltd_obd = tgt_obd;
 573         /* XXX - add a sanity check on the generation number. */
 574         tgt->ltd_gen = gen;
 575         tgt->ltd_index = index;
 576         tgt->ltd_activate = active;
 577         lov->lov_tgts[index] = tgt;
 578         if (index >= lov->desc.ld_tgt_count)
 579                 lov->desc.ld_tgt_count = index + 1;
 580
 581         mutex_unlock(&lov->lov_lock);
 582
 583         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 584                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 585
 586         if (lov->lov_connects == 0) {
 587                 /* lov_connect hasn't been called yet. We'll do the
 588                    lov_connect_obd on this target when that fn first runs,
 589                    because we don't know the connect flags yet. */
 590                 RETURN(0);
 591         }
 592
 593         obd_getref(obd);
 594
 595         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 596         if (rc)
 597                 GOTO(out, rc);
 598
 599         /* connect to administrative disabled ost */
 600         if (!tgt->ltd_exp)
 601                 GOTO(out, rc = 0);
 602
 603         if (lov->lov_cache != NULL) {
 604                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 605                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 606                                 sizeof(struct cl_client_cache), lov->lov_cache,
 607                                 NULL);
 608                 if (rc < 0)
 609                         GOTO(out, rc);
 610         }
 611
 612         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 613                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 614                         (void *)&index);
 615
 616 out:
 617         if (rc) {
 618                 CERROR("add failed (%d), deleting %s\n", rc,
 619                        obd_uuid2str(&tgt->ltd_uuid));
 620                 lov_del_target(obd, index, NULL, 0);
 621         }
 622         obd_putref(obd);
 623         RETURN(rc);
 624 }
 625
 626 /* Schedule a target for deletion */
 627 int lov_del_target(struct obd_device *obd, __u32 index,
 628                    struct obd_uuid *uuidp, int gen)
 629 {
 630         struct lov_obd *lov = &obd->u.lov;
 631         int count = lov->desc.ld_tgt_count;
 632         int rc = 0;
 633         ENTRY;
 634
 635         if (index >= count) {
 636                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 637                        index, count);
 638                 RETURN(-EINVAL);
 639         }
 640
 641         /* to make sure there's no ongoing lov_notify() now */
 642         down_write(&lov->lov_notify_lock);
 643         obd_getref(obd);
 644
 645         if (!lov->lov_tgts[index]) {
 646                 CERROR("LOV target at index %d is not setup.\n", index);
 647                 GOTO(out, rc = -EINVAL);
 648         }
 649
 650         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 651                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 652                        lov_uuid2str(lov, index), index,
 653                        obd_uuid2str(uuidp));
 654                 GOTO(out, rc = -EINVAL);
 655         }
 656
 657         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 658                lov_uuid2str(lov, index), index,
 659                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 660                lov->lov_tgts[index]->ltd_active);
 661
 662         lov->lov_tgts[index]->ltd_reap = 1;
 663         lov->lov_death_row++;
 664         /* we really delete it from obd_putref */
 665 out:
 666         obd_putref(obd);
 667         up_write(&lov->lov_notify_lock);
 668
 669         RETURN(rc);
 670 }
 671
 672 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 673 {
 674         struct obd_device *osc_obd;
 675
 676         LASSERT(tgt);
 677         LASSERT(tgt->ltd_reap);
 678
 679         osc_obd = class_exp2obd(tgt->ltd_exp);
 680
 681         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 682                tgt->ltd_uuid.uuid,
 683                osc_obd ? osc_obd->obd_name : "<no obd>");
 684
 685         if (tgt->ltd_exp)
 686                 lov_disconnect_obd(obd, tgt);
 687
 688         OBD_FREE_PTR(tgt);
 689
 690         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 691            do it ourselves. And we can't do it from lov_cleanup,
 692            because we just lost our only reference to it. */
 693         if (osc_obd)
 694                 class_manual_cleanup(osc_obd);
 695 }
 696
 697 void lov_fix_desc_stripe_size(__u64 *val)
 698 {
 699         if (*val < LOV_MIN_STRIPE_SIZE) {
 700                 if (*val != 0)
 701                         LCONSOLE_INFO("Increasing default stripe size to "
 702                                       "minimum %u\n",
 703                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 704                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 705         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 706                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 707                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
 708                               "multiple of %u)\n",
 709                               *val, LOV_MIN_STRIPE_SIZE);
 710         }
 711 }
 712
 713 void lov_fix_desc_stripe_count(__u32 *val)
 714 {
 715         if (*val == 0)
 716                 *val = 1;
 717 }
 718
 719 void lov_fix_desc_pattern(__u32 *val)
 720 {
 721         /* from lov_setstripe */
 722         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 723                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 724                 *val = 0;
 725         }
 726 }
 727
 728 void lov_fix_desc_qos_maxage(__u32 *val)
 729 {
 730         if (*val == 0)
 731                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 732 }
 733
 734 void lov_fix_desc(struct lov_desc *desc)
 735 {
 736         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 737         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 738         lov_fix_desc_pattern(&desc->ld_pattern);
 739         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 740 }
 741
 742 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 743 {
 744         struct lov_desc *desc;
 745         struct lov_obd *lov = &obd->u.lov;
 746 #ifdef CONFIG_PROC_FS
 747         struct obd_type *type;
 748 #endif
 749         int rc;
 750         ENTRY;
 751
 752         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 753                 CERROR("LOV setup requires a descriptor\n");
 754                 RETURN(-EINVAL);
 755         }
 756
 757         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 758
 759         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 760                 CERROR("descriptor size wrong: %d > %d\n",
 761                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 762                 RETURN(-EINVAL);
 763         }
 764
 765         if (desc->ld_magic != LOV_DESC_MAGIC) {
 766                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 767                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 768                                    obd->obd_name, desc);
 769                             lustre_swab_lov_desc(desc);
 770                 } else {
 771                         CERROR("%s: Bad lov desc magic: %#x\n",
 772                                obd->obd_name, desc->ld_magic);
 773                         RETURN(-EINVAL);
 774                 }
 775         }
 776
 777         lov_fix_desc(desc);
 778
 779         desc->ld_active_tgt_count = 0;
 780         lov->desc = *desc;
 781         lov->lov_tgt_size = 0;
 782
 783         mutex_init(&lov->lov_lock);
 784         atomic_set(&lov->lov_refcount, 0);
 785         lov->lov_sp_me = LUSTRE_SP_CLI;
 786
 787         init_rwsem(&lov->lov_notify_lock);
 788
 789         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 790                                                    HASH_POOLS_MAX_BITS,
 791                                                    HASH_POOLS_BKT_BITS, 0,
 792                                                    CFS_HASH_MIN_THETA,
 793                                                    CFS_HASH_MAX_THETA,
 794                                                    &pool_hash_operations,
 795                                                    CFS_HASH_DEFAULT);
 796         INIT_LIST_HEAD(&lov->lov_pool_list);
 797         lov->lov_pool_count = 0;
 798         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 799         if (rc)
 800                 GOTO(out, rc);
 801
 802 #ifdef CONFIG_PROC_FS
 803         obd->obd_vars = lprocfs_lov_obd_vars;
 804         /* If this is true then both client (lov) and server
 805          * (lod) are on the same node. The lod layer if loaded
 806          * first will register the lov proc directory. In that
 807          * case obd->obd_type->typ_procroot will be not set.
 808          * Instead we use type->typ_procsym as the parent. */
 809         type = class_search_type(LUSTRE_LOD_NAME);
 810         if (type != NULL && type->typ_procsym != NULL) {
 811                 obd->obd_proc_entry = lprocfs_register(obd->obd_name,
 812                                                        type->typ_procsym,
 813                                                        obd->obd_vars, obd);
 814                 if (IS_ERR(obd->obd_proc_entry)) {
 815                         rc = PTR_ERR(obd->obd_proc_entry);
 816                         CERROR("error %d setting up lprocfs for %s\n", rc,
 817                                obd->obd_name);
 818                         obd->obd_proc_entry = NULL;
 819                 }
 820         } else {
 821                 rc = lprocfs_obd_setup(obd);
 822         }
 823
 824         if (rc == 0) {
 825                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
 826                                         0444, &lov_proc_target_fops, obd);
 827                 if (rc)
 828                         CWARN("Error adding the target_obd file\n");
 829
 830                 lov->lov_pool_proc_entry = lprocfs_register("pools",
 831                                                             obd->obd_proc_entry,
 832                                                             NULL, NULL);
 833                 if (IS_ERR(lov->lov_pool_proc_entry)) {
 834                         rc = PTR_ERR(lov->lov_pool_proc_entry);
 835                         CERROR("error %d setting up lprocfs for pools\n", rc);
 836                         lov->lov_pool_proc_entry = NULL;
 837                 }
 838         }
 839 #endif
 840         RETURN(0);
 841
 842 out:
 843         return rc;
 844 }
 845
 846 static int lov_cleanup(struct obd_device *obd)
 847 {
 848         struct lov_obd *lov = &obd->u.lov;
 849         struct list_head *pos, *tmp;
 850         struct pool_desc *pool;
 851         ENTRY;
 852
 853         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 854                 pool = list_entry(pos, struct pool_desc, pool_list);
 855                 /* free pool structs */
 856                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 857                 /* In the function below, .hs_keycmp resolves to
 858                  * pool_hashkey_keycmp() */
 859                 /* coverity[overrun-buffer-val] */
 860                 lov_pool_del(obd, pool->pool_name);
 861         }
 862         cfs_hash_putref(lov->lov_pools_hash_body);
 863         lov_ost_pool_free(&lov->lov_packed);
 864
 865         lprocfs_obd_cleanup(obd);
 866         if (lov->lov_tgts) {
 867                 int i;
 868                 obd_getref(obd);
 869                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 870                         if (!lov->lov_tgts[i])
 871                                 continue;
 872
 873                         /* Inactive targets may never have connected */
 874                         if (lov->lov_tgts[i]->ltd_active ||
 875                             atomic_read(&lov->lov_refcount))
 876                                 /* We should never get here - these
 877                                  * should have been removed in the
 878                                  * disconnect. */
 879                                 CERROR("%s: lov tgt %d not cleaned! "
 880                                        "deathrow=%d, lovrc=%d\n",
 881                                        obd->obd_name, i, lov->lov_death_row,
 882                                        atomic_read(&lov->lov_refcount));
 883                         lov_del_target(obd, i, NULL, 0);
 884                 }
 885                 obd_putref(obd);
 886                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 887                          lov->lov_tgt_size);
 888                 lov->lov_tgt_size = 0;
 889         }
 890
 891         if (lov->lov_cache != NULL) {
 892                 cl_cache_decref(lov->lov_cache);
 893                 lov->lov_cache = NULL;
 894         }
 895
 896         RETURN(0);
 897 }
 898
 899 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 900                             __u32 *indexp, int *genp)
 901 {
 902         struct obd_uuid obd_uuid;
 903         int cmd;
 904         int rc = 0;
 905         ENTRY;
 906
 907         switch(cmd = lcfg->lcfg_command) {
 908         case LCFG_LOV_ADD_OBD:
 909         case LCFG_LOV_ADD_INA:
 910         case LCFG_LOV_DEL_OBD: {
 911                 __u32 index;
 912                 int gen;
 913                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 914                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
 915                         GOTO(out, rc = -EINVAL);
 916
 917                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 918
 919                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", indexp) != 1)
 920                         GOTO(out, rc = -EINVAL);
 921                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1)
 922                         GOTO(out, rc = -EINVAL);
 923                 index = *indexp;
 924                 gen = *genp;
 925                 if (cmd == LCFG_LOV_ADD_OBD)
 926                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 927                 else if (cmd == LCFG_LOV_ADD_INA)
 928                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 929                 else
 930                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 931                 GOTO(out, rc);
 932         }
 933         case LCFG_PARAM: {
 934                 struct lov_desc *desc = &(obd->u.lov.desc);
 935
 936                 if (!desc)
 937                         GOTO(out, rc = -EINVAL);
 938
 939                 rc = class_process_proc_param(PARAM_LOV, obd->obd_vars,
 940                                               lcfg, obd);
 941                 if (rc > 0)
 942                         rc = 0;
 943                 GOTO(out, rc);
 944         }
 945         case LCFG_POOL_NEW:
 946         case LCFG_POOL_ADD:
 947         case LCFG_POOL_DEL:
 948         case LCFG_POOL_REM:
 949                 GOTO(out, rc);
 950
 951         default: {
 952                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 953                 GOTO(out, rc = -EINVAL);
 954
 955         }
 956         }
 957 out:
 958         RETURN(rc);
 959 }
 960
 961 static int
 962 lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
 963 {
 964         struct lov_request_set *lovset = (struct lov_request_set *)data;
 965         int err;
 966         ENTRY;
 967
 968         if (rc)
 969                 atomic_set(&lovset->set_completes, 0);
 970
 971         err = lov_fini_statfs_set(lovset);
 972         RETURN(rc ? rc : err);
 973 }
 974
 975 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
 976                             __u64 max_age, struct ptlrpc_request_set *rqset)
 977 {
 978         struct obd_device      *obd = class_exp2obd(exp);
 979         struct lov_request_set *set;
 980         struct lov_request *req;
 981         struct list_head *pos;
 982         struct lov_obd *lov;
 983         int rc = 0;
 984         ENTRY;
 985
 986         LASSERT(oinfo != NULL);
 987         LASSERT(oinfo->oi_osfs != NULL);
 988
 989         lov = &obd->u.lov;
 990         rc = lov_prep_statfs_set(obd, oinfo, &set);
 991         if (rc)
 992                 RETURN(rc);
 993
 994         list_for_each(pos, &set->set_list) {
 995                 req = list_entry(pos, struct lov_request, rq_link);
 996                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
 997                                       &req->rq_oi, max_age, rqset);
 998                 if (rc)
 999                         break;
1000         }
1001
1002         if (rc || list_empty(&rqset->set_requests)) {
1003                 int err;
1004                 if (rc)
1005                         atomic_set(&set->set_completes, 0);
1006                 err = lov_fini_statfs_set(set);
1007                 RETURN(rc ? rc : err);
1008         }
1009
1010         LASSERT(rqset->set_interpret == NULL);
1011         rqset->set_interpret = lov_statfs_interpret;
1012         rqset->set_arg = (void *)set;
1013         RETURN(0);
1014 }
1015
1016 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1017                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1018 {
1019         struct ptlrpc_request_set *set = NULL;
1020         struct obd_info oinfo = {
1021                 .oi_osfs = osfs,
1022                 .oi_flags = flags,
1023         };
1024         int rc = 0;
1025
1026         ENTRY;
1027
1028         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1029          * statfs requests */
1030         set = ptlrpc_prep_set();
1031         if (set == NULL)
1032                 RETURN(-ENOMEM);
1033
1034         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1035         if (rc == 0)
1036                 rc = ptlrpc_set_wait(set);
1037
1038         ptlrpc_set_destroy(set);
1039
1040         RETURN(rc);
1041 }
1042
1043 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1044                          void *karg, void __user *uarg)
1045 {
1046         struct obd_device *obddev = class_exp2obd(exp);
1047         struct lov_obd *lov = &obddev->u.lov;
1048         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1049         struct obd_uuid *uuidp;
1050         ENTRY;
1051
1052         switch (cmd) {
1053         case IOC_OBD_STATFS: {
1054                 struct obd_ioctl_data *data = karg;
1055                 struct obd_device *osc_obd;
1056                 struct obd_statfs stat_buf = {0};
1057                 __u32 index;
1058                 __u32 flags;
1059
1060                 memcpy(&index, data->ioc_inlbuf2, sizeof(index));
1061                 if ((index >= count))
1062                         RETURN(-ENODEV);
1063
1064                 if (!lov->lov_tgts[index])
1065                         /* Try again with the next index */
1066                         RETURN(-EAGAIN);
1067                 if (!lov->lov_tgts[index]->ltd_active)
1068                         RETURN(-ENODATA);
1069
1070                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1071                 if (!osc_obd)
1072                         RETURN(-EINVAL);
1073
1074                 /* copy UUID */
1075                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1076                                  min_t(unsigned long, data->ioc_plen2,
1077                                        sizeof(struct obd_uuid))))
1078                         RETURN(-EFAULT);
1079
1080                 memcpy(&flags, data->ioc_inlbuf1, sizeof(flags));
1081                 flags = flags & LL_STATFS_NODELAY ? OBD_STATFS_NODELAY : 0;
1082
1083                 /* got statfs data */
1084                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1085                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1086                                 flags);
1087                 if (rc)
1088                         RETURN(rc);
1089                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1090                                  min_t(unsigned long, data->ioc_plen1,
1091                                        sizeof(struct obd_statfs))))
1092                         RETURN(-EFAULT);
1093                 break;
1094         }
1095         case OBD_IOC_LOV_GET_CONFIG: {
1096                 struct obd_ioctl_data *data;
1097                 struct lov_desc *desc;
1098                 char *buf = NULL;
1099                 __u32 *genp;
1100
1101                 len = 0;
1102                 if (obd_ioctl_getdata(&buf, &len, uarg))
1103                         RETURN(-EINVAL);
1104
1105                 data = (struct obd_ioctl_data *)buf;
1106
1107                 if (sizeof(*desc) > data->ioc_inllen1) {
1108                         obd_ioctl_freedata(buf, len);
1109                         RETURN(-EINVAL);
1110                 }
1111
1112                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1113                         obd_ioctl_freedata(buf, len);
1114                         RETURN(-EINVAL);
1115                 }
1116
1117                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1118                         obd_ioctl_freedata(buf, len);
1119                         RETURN(-EINVAL);
1120                 }
1121
1122                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1123                 memcpy(desc, &(lov->desc), sizeof(*desc));
1124
1125                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1126                 genp = (__u32 *)data->ioc_inlbuf3;
1127                 /* the uuid will be empty for deleted OSTs */
1128                 for (i = 0; i < count; i++, uuidp++, genp++) {
1129                         if (!lov->lov_tgts[i])
1130                                 continue;
1131                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1132                         *genp = lov->lov_tgts[i]->ltd_gen;
1133                 }
1134
1135                 if (copy_to_user(uarg, buf, len))
1136                         rc = -EFAULT;
1137                 obd_ioctl_freedata(buf, len);
1138                 break;
1139         }
1140         case OBD_IOC_QUOTACTL: {
1141                 struct if_quotactl *qctl = karg;
1142                 struct lov_tgt_desc *tgt = NULL;
1143                 struct obd_quotactl *oqctl;
1144
1145                 if (qctl->qc_valid == QC_OSTIDX) {
1146                         if (count <= qctl->qc_idx)
1147                                 RETURN(-EINVAL);
1148
1149                         tgt = lov->lov_tgts[qctl->qc_idx];
1150                         if (!tgt || !tgt->ltd_exp)
1151                                 RETURN(-EINVAL);
1152                 } else if (qctl->qc_valid == QC_UUID) {
1153                         for (i = 0; i < count; i++) {
1154                                 tgt = lov->lov_tgts[i];
1155                                 if (!tgt ||
1156                                     !obd_uuid_equals(&tgt->ltd_uuid,
1157                                                      &qctl->obd_uuid))
1158                                         continue;
1159
1160                                 if (tgt->ltd_exp == NULL)
1161                                         RETURN(-EINVAL);
1162
1163                                 break;
1164                         }
1165                 } else {
1166                         RETURN(-EINVAL);
1167                 }
1168
1169                 if (i >= count)
1170                         RETURN(-EAGAIN);
1171
1172                 LASSERT(tgt && tgt->ltd_exp);
1173                 OBD_ALLOC_PTR(oqctl);
1174                 if (!oqctl)
1175                         RETURN(-ENOMEM);
1176
1177                 QCTL_COPY(oqctl, qctl);
1178                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1179                 if (rc == 0) {
1180                         QCTL_COPY(qctl, oqctl);
1181                         qctl->qc_valid = QC_OSTIDX;
1182                         qctl->obd_uuid = tgt->ltd_uuid;
1183                 }
1184                 OBD_FREE_PTR(oqctl);
1185                 break;
1186         }
1187         default: {
1188                 int set = 0;
1189
1190                 if (count == 0)
1191                         RETURN(-ENOTTY);
1192
1193                 for (i = 0; i < count; i++) {
1194                         int err;
1195                         struct obd_device *osc_obd;
1196
1197                         /* OST was disconnected */
1198                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1199                                 continue;
1200
1201                         /* ll_umount_begin() sets force flag but for lov, not
1202                          * osc. Let's pass it through */
1203                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1204                         osc_obd->obd_force = obddev->obd_force;
1205                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1206                                             len, karg, uarg);
1207                         if (err) {
1208                                 if (lov->lov_tgts[i]->ltd_active) {
1209                                         CDEBUG(err == -ENOTTY ?
1210                                                D_IOCTL : D_WARNING,
1211                                                "iocontrol OSC %s on OST "
1212                                                "idx %d cmd %x: err = %d\n",
1213                                                lov_uuid2str(lov, i),
1214                                                i, cmd, err);
1215                                         if (!rc)
1216                                                 rc = err;
1217                                 }
1218                         } else {
1219                                 set = 1;
1220                         }
1221                 }
1222                 if (!set && !rc)
1223                         rc = -EIO;
1224         }
1225         }
1226
1227         RETURN(rc);
1228 }
1229
1230 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1231                         __u32 keylen, void *key, __u32 *vallen, void *val)
1232 {
1233         struct obd_device *obddev = class_exp2obd(exp);
1234         struct lov_obd *lov = &obddev->u.lov;
1235         struct lov_desc *ld = &lov->desc;
1236         int rc = 0;
1237         ENTRY;
1238
1239         if (vallen == NULL || val == NULL)
1240                 RETURN(-EFAULT);
1241
1242         obd_getref(obddev);
1243
1244         if (KEY_IS(KEY_MAX_EASIZE)) {
1245                 u32 max_stripe_count = min_t(u32, ld->ld_active_tgt_count,
1246                                              LOV_MAX_STRIPE_COUNT);
1247
1248                 *((u32 *)val) = lov_mds_md_size(max_stripe_count, LOV_MAGIC_V3);
1249         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
1250                 u32 def_stripe_count = min_t(u32, ld->ld_default_stripe_count,
1251                                              LOV_MAX_STRIPE_COUNT);
1252
1253                 *((u32 *)val) = lov_mds_md_size(def_stripe_count, LOV_MAGIC_V3);
1254         } else if (KEY_IS(KEY_TGT_COUNT)) {
1255                 *((int *)val) = lov->desc.ld_tgt_count;
1256         } else {
1257                 rc = -EINVAL;
1258         }
1259
1260         obd_putref(obddev);
1261
1262         RETURN(rc);
1263 }
1264
1265 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
1266                               __u32 keylen, void *key,
1267                               __u32 vallen, void *val,
1268                               struct ptlrpc_request_set *set)
1269 {
1270         struct obd_device *obddev = class_exp2obd(exp);
1271         struct lov_obd *lov = &obddev->u.lov;
1272         struct lov_tgt_desc *tgt;
1273         int do_inactive = 0;
1274         int no_set = 0;
1275         u32 count;
1276         u32 i;
1277         int rc = 0;
1278         int err;
1279         ENTRY;
1280
1281         if (set == NULL) {
1282                 no_set = 1;
1283                 set = ptlrpc_prep_set();
1284                 if (!set)
1285                         RETURN(-ENOMEM);
1286         }
1287
1288         obd_getref(obddev);
1289         count = lov->desc.ld_tgt_count;
1290
1291         if (KEY_IS(KEY_CHECKSUM)) {
1292                 do_inactive = 1;
1293         } else if (KEY_IS(KEY_CACHE_SET)) {
1294                 LASSERT(lov->lov_cache == NULL);
1295                 lov->lov_cache = val;
1296                 do_inactive = 1;
1297                 cl_cache_incref(lov->lov_cache);
1298         }
1299
1300         for (i = 0; i < count; i++) {
1301                 tgt = lov->lov_tgts[i];
1302
1303                 /* OST was disconnected */
1304                 if (!tgt || !tgt->ltd_exp)
1305                         continue;
1306
1307                 /* OST is inactive and we don't want inactive OSCs */
1308                 if (!tgt->ltd_active && !do_inactive)
1309                         continue;
1310
1311                 err = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1312                                          vallen, val, set);
1313                 if (!rc)
1314                         rc = err;
1315         }
1316
1317         obd_putref(obddev);
1318         if (no_set) {
1319                 err = ptlrpc_set_wait(set);
1320                 if (!rc)
1321                         rc = err;
1322                 ptlrpc_set_destroy(set);
1323         }
1324         RETURN(rc);
1325 }
1326
1327 void lov_stripe_lock(struct lov_stripe_md *md)
1328 __acquires(&md->lsm_lock)
1329 {
1330         LASSERT(md->lsm_lock_owner != current_pid());
1331         spin_lock(&md->lsm_lock);
1332         LASSERT(md->lsm_lock_owner == 0);
1333         md->lsm_lock_owner = current_pid();
1334 }
1335
1336 void lov_stripe_unlock(struct lov_stripe_md *md)
1337 __releases(&md->lsm_lock)
1338 {
1339         LASSERT(md->lsm_lock_owner == current_pid());
1340         md->lsm_lock_owner = 0;
1341         spin_unlock(&md->lsm_lock);
1342 }
1343
1344 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
1345                         struct obd_quotactl *oqctl)
1346 {
1347         struct lov_obd      *lov = &obd->u.lov;
1348         struct lov_tgt_desc *tgt;
1349         __u64                curspace = 0;
1350         __u64                bhardlimit = 0;
1351         int                  i, rc = 0;
1352         ENTRY;
1353
1354         if (oqctl->qc_cmd != Q_GETOQUOTA &&
1355             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA) {
1356                 CERROR("%s: bad quota opc %x for lov obd\n",
1357                        obd->obd_name, oqctl->qc_cmd);
1358                 RETURN(-EFAULT);
1359         }
1360
1361         /* for lov tgt */
1362         obd_getref(obd);
1363         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1364                 int err;
1365
1366                 tgt = lov->lov_tgts[i];
1367
1368                 if (!tgt)
1369                         continue;
1370
1371                 if (!tgt->ltd_active || tgt->ltd_reap) {
1372                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
1373                             lov->lov_tgts[i]->ltd_activate) {
1374                                 rc = -ENETDOWN;
1375                                 CERROR("ost %d is inactive\n", i);
1376                         } else {
1377                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
1378                         }
1379                         continue;
1380                 }
1381
1382                 err = obd_quotactl(tgt->ltd_exp, oqctl);
1383                 if (err) {
1384                         if (tgt->ltd_active && !rc)
1385                                 rc = err;
1386                         continue;
1387                 }
1388
1389                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
1390                         curspace += oqctl->qc_dqblk.dqb_curspace;
1391                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
1392                 }
1393         }
1394         obd_putref(obd);
1395
1396         if (oqctl->qc_cmd == Q_GETOQUOTA) {
1397                 oqctl->qc_dqblk.dqb_curspace = curspace;
1398                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
1399         }
1400         RETURN(rc);
1401 }
1402
1403 static struct obd_ops lov_obd_ops = {
1404         .o_owner                = THIS_MODULE,
1405         .o_setup                = lov_setup,
1406         .o_cleanup              = lov_cleanup,
1407         .o_connect              = lov_connect,
1408         .o_disconnect           = lov_disconnect,
1409         .o_statfs               = lov_statfs,
1410         .o_statfs_async         = lov_statfs_async,
1411         .o_iocontrol            = lov_iocontrol,
1412         .o_get_info             = lov_get_info,
1413         .o_set_info_async       = lov_set_info_async,
1414         .o_notify               = lov_notify,
1415         .o_pool_new             = lov_pool_new,
1416         .o_pool_rem             = lov_pool_remove,
1417         .o_pool_add             = lov_pool_add,
1418         .o_pool_del             = lov_pool_del,
1419         .o_getref               = lov_getref,
1420         .o_putref               = lov_putref,
1421         .o_quotactl             = lov_quotactl,
1422 };
1423
1424 struct kmem_cache *lov_oinfo_slab;
1425
1426 static int __init lov_init(void)
1427 {
1428         bool enable_proc = true;
1429         struct obd_type *type;
1430         int rc;
1431         ENTRY;
1432
1433         /* print an address of _any_ initialized kernel symbol from this
1434          * module, to allow debugging with gdb that doesn't support data
1435          * symbols from modules.*/
1436         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
1437
1438         rc = lu_kmem_init(lov_caches);
1439         if (rc)
1440                 return rc;
1441
1442         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
1443                                            sizeof(struct lov_oinfo), 0,
1444                                            SLAB_HWCACHE_ALIGN, NULL);
1445         if (lov_oinfo_slab == NULL) {
1446                 lu_kmem_fini(lov_caches);
1447                 return -ENOMEM;
1448         }
1449
1450         type = class_search_type(LUSTRE_LOD_NAME);
1451         if (type != NULL && type->typ_procsym != NULL)
1452                 enable_proc = false;
1453
1454         rc = class_register_type(&lov_obd_ops, NULL, enable_proc, NULL,
1455                                  LUSTRE_LOV_NAME, &lov_device_type);
1456
1457         if (rc) {
1458                 kmem_cache_destroy(lov_oinfo_slab);
1459                 lu_kmem_fini(lov_caches);
1460         }
1461
1462         RETURN(rc);
1463 }
1464
1465 static void __exit lov_exit(void)
1466 {
1467         class_unregister_type(LUSTRE_LOV_NAME);
1468         kmem_cache_destroy(lov_oinfo_slab);
1469         lu_kmem_fini(lov_caches);
1470 }
1471
1472 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1473 MODULE_DESCRIPTION("Lustre Logical Object Volume");
1474 MODULE_VERSION(LUSTRE_VERSION_STRING);
1475 MODULE_LICENSE("GPL");
1476
1477 module_init(lov_init);
1478 module_exit(lov_exit);