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, 2017, 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 <cl_object.h>
  44 #include <lustre_dlm.h>
  45 #include <lustre_fid.h>
  46 #include <uapi/linux/lustre/lustre_ioctl.h>
  47 #include <lustre_lib.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_net.h>
  50 #include <uapi/linux/lustre/lustre_param.h>
  51 #include <lustre_swab.h>
  52 #include <lprocfs_status.h>
  53 #include <obd_class.h>
  54 #include <obd_support.h>
  55
  56 #include "lov_internal.h"
  57
  58 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  59    Any function that expects lov_tgts to remain stationary must take a ref. */
  60 void lov_tgts_getref(struct obd_device *obd)
  61 {
  62         struct lov_obd *lov = &obd->u.lov;
  63
  64         /* nobody gets through here until lov_putref is done */
  65         mutex_lock(&lov->lov_lock);
  66         atomic_inc(&lov->lov_refcount);
  67         mutex_unlock(&lov->lov_lock);
  68         return;
  69 }
  70
  71 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  72
  73 void lov_tgts_putref(struct obd_device *obd)
  74 {
  75         struct lov_obd *lov = &obd->u.lov;
  76
  77         mutex_lock(&lov->lov_lock);
  78         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  79         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  80                 struct list_head kill = LIST_HEAD_INIT(kill);
  81                 struct lov_tgt_desc *tgt, *n;
  82                 int i;
  83
  84                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  85                        lov->lov_death_row);
  86                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  87                         tgt = lov->lov_tgts[i];
  88
  89                         if (!tgt || !tgt->ltd_reap)
  90                                 continue;
  91                         list_add(&tgt->ltd_kill, &kill);
  92                         /* XXX - right now there is a dependency on ld_tgt_count
  93                          * being the maximum tgt index for computing the
  94                          * mds_max_easize. So we can't shrink it. */
  95                         lov_ost_pool_remove(&lov->lov_packed, i);
  96                         lov->lov_tgts[i] = NULL;
  97                         lov->lov_death_row--;
  98                 }
  99                 mutex_unlock(&lov->lov_lock);
 100
 101                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 102                         list_del(&tgt->ltd_kill);
 103                         /* Disconnect */
 104                         __lov_del_obd(obd, tgt);
 105                 }
 106         } else {
 107                 mutex_unlock(&lov->lov_lock);
 108         }
 109 }
 110
 111 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 112                               enum obd_notify_event ev);
 113 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 114                       enum obd_notify_event ev);
 115
 116 int lov_connect_obd(struct obd_device *obd, u32 index, int activate,
 117                     struct obd_connect_data *data)
 118 {
 119         struct lov_obd *lov = &obd->u.lov;
 120         struct obd_uuid *tgt_uuid;
 121         struct obd_device *tgt_obd;
 122         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 123         struct obd_import *imp;
 124         int rc;
 125         ENTRY;
 126
 127         if (lov->lov_tgts[index] == NULL)
 128                 RETURN(-EINVAL);
 129
 130         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 131         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 132
 133         if (!tgt_obd->obd_set_up) {
 134                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 135                 RETURN(-EINVAL);
 136         }
 137
 138         /* override the sp_me from lov */
 139         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 140
 141         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 142                 data->ocd_index = index;
 143
 144         /*
 145          * Divine LOV knows that OBDs under it are OSCs.
 146          */
 147         imp = tgt_obd->u.cli.cl_import;
 148
 149         if (activate) {
 150                 tgt_obd->obd_no_recov = 0;
 151                 /* FIXME this is probably supposed to be
 152                    ptlrpc_set_import_active.  Horrible naming. */
 153                 ptlrpc_activate_import(imp);
 154         }
 155
 156         rc = obd_register_observer(tgt_obd, obd);
 157         if (rc) {
 158                 CERROR("Target %s register_observer error %d\n",
 159                        obd_uuid2str(tgt_uuid), rc);
 160                 RETURN(rc);
 161         }
 162
 163
 164         if (imp->imp_invalid) {
 165                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively "
 166                        "disabled\n", obd_uuid2str(tgt_uuid));
 167                 RETURN(0);
 168         }
 169
 170         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 171                          &lov_osc_uuid, data, NULL);
 172         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 173                 CERROR("Target %s connect error %d\n",
 174                        obd_uuid2str(tgt_uuid), rc);
 175                 RETURN(-ENODEV);
 176         }
 177
 178         lov->lov_tgts[index]->ltd_reap = 0;
 179
 180         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 181                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 182
 183         if (lov->lov_tgts_kobj) {
 184                 /* Even if we failed, that's ok */
 185                 rc = sysfs_create_link(lov->lov_tgts_kobj,
 186                                        &tgt_obd->obd_kset.kobj,
 187                                        tgt_obd->obd_name);
 188                 if (rc) {
 189                         CERROR("%s: can't register LOV target /sys/fs/lustre/%s/%s/target_obds/%s : rc = %d\n",
 190                                obd->obd_name, obd->obd_type->typ_name,
 191                                obd->obd_name,
 192                                lov->lov_tgts[index]->ltd_exp->exp_obd->obd_name,
 193                                rc);
 194                 }
 195         }
 196         RETURN(0);
 197 }
 198
 199 static int lov_connect(const struct lu_env *env,
 200                        struct obd_export **exp, struct obd_device *obd,
 201                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 202                        void *localdata)
 203 {
 204         struct lov_obd *lov = &obd->u.lov;
 205         struct lov_tgt_desc *tgt;
 206         struct lustre_handle conn;
 207         int i, rc;
 208         ENTRY;
 209
 210         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 211
 212         rc = class_connect(&conn, obd, cluuid);
 213         if (rc)
 214                 RETURN(rc);
 215
 216         *exp = class_conn2export(&conn);
 217
 218         /* Why should there ever be more than 1 connect? */
 219         lov->lov_connects++;
 220         LASSERT(lov->lov_connects == 1);
 221
 222         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 223         if (data)
 224                 lov->lov_ocd = *data;
 225
 226         lov_tgts_getref(obd);
 227
 228         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 229                 tgt = lov->lov_tgts[i];
 230                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 231                         continue;
 232                 /* Flags will be lowest common denominator */
 233                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 234                 if (rc) {
 235                         CERROR("%s: lov connect tgt %d failed: %d\n",
 236                                obd->obd_name, i, rc);
 237                         continue;
 238                 }
 239                 /* connect to administrative disabled ost */
 240                 if (!lov->lov_tgts[i]->ltd_exp)
 241                         continue;
 242
 243                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 244                                 OBD_NOTIFY_CONNECT);
 245                 if (rc) {
 246                         CERROR("%s error sending notify %d\n",
 247                                obd->obd_name, rc);
 248                 }
 249         }
 250
 251         lov_tgts_putref(obd);
 252
 253         RETURN(0);
 254 }
 255
 256 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 257 {
 258         struct lov_obd *lov = &obd->u.lov;
 259         struct obd_device *osc_obd;
 260         int rc;
 261         ENTRY;
 262
 263         osc_obd = class_exp2obd(tgt->ltd_exp);
 264         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 265                obd->obd_name, osc_obd->obd_name);
 266
 267         if (tgt->ltd_active) {
 268                 tgt->ltd_active = 0;
 269                 lov->desc.ld_active_tgt_count--;
 270                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 271         }
 272
 273         if (osc_obd) {
 274                 if (lov->lov_tgts_kobj)
 275                         sysfs_remove_link(lov->lov_tgts_kobj,
 276                                           osc_obd->obd_name);
 277
 278                 /* Pass it on to our clients.
 279                  * XXX This should be an argument to disconnect,
 280                  * XXX not a back-door flag on the OBD.  Ah well.
 281                  */
 282                 osc_obd->obd_force = obd->obd_force;
 283                 osc_obd->obd_fail = obd->obd_fail;
 284                 osc_obd->obd_no_recov = obd->obd_no_recov;
 285
 286                 if (lov->targets_proc_entry != NULL)
 287                         lprocfs_remove_proc_entry(osc_obd->obd_name,
 288                                                   lov->targets_proc_entry);
 289         }
 290
 291         obd_register_observer(osc_obd, NULL);
 292
 293         rc = obd_disconnect(tgt->ltd_exp);
 294         if (rc) {
 295                 CERROR("Target %s disconnect error %d\n",
 296                        tgt->ltd_uuid.uuid, rc);
 297                 rc = 0;
 298         }
 299
 300         tgt->ltd_exp = NULL;
 301         RETURN(0);
 302 }
 303
 304 static int lov_disconnect(struct obd_export *exp)
 305 {
 306         struct obd_device *obd = class_exp2obd(exp);
 307         struct lov_obd *lov = &obd->u.lov;
 308         u32 index;
 309         int rc;
 310
 311         ENTRY;
 312         if (!lov->lov_tgts)
 313                 goto out;
 314
 315         /* Only disconnect the underlying layers on the final disconnect. */
 316         lov->lov_connects--;
 317         if (lov->lov_connects != 0) {
 318                 /* why should there be more than 1 connect? */
 319                 CWARN("%s: unexpected disconnect #%d\n",
 320                       obd->obd_name, lov->lov_connects);
 321                 goto out;
 322         }
 323
 324         /* hold another ref so lov_del_obd() doesn't spin in putref each time */
 325         lov_tgts_getref(obd);
 326
 327         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 328                 if (lov->lov_tgts[index] && lov->lov_tgts[index]->ltd_exp) {
 329                         /* Disconnection is the last we know about an OBD */
 330                         lov_del_target(obd, index, NULL,
 331                                        lov->lov_tgts[index]->ltd_gen);
 332                 }
 333         }
 334         lov_tgts_putref(obd);
 335
 336 out:
 337         rc = class_disconnect(exp); /* bz 9811 */
 338         RETURN(rc);
 339 }
 340
 341 /* Error codes:
 342  *
 343  *  -EINVAL  : UUID can't be found in the LOV's target list
 344  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 345  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 346  *  any >= 0 : is log target index
 347  */
 348 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 349                               enum obd_notify_event ev)
 350 {
 351         struct lov_obd *lov = &obd->u.lov;
 352         struct lov_tgt_desc *tgt;
 353         int index, activate, active;
 354         ENTRY;
 355
 356         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 357                lov, uuid->uuid, ev);
 358
 359         lov_tgts_getref(obd);
 360         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 361                 tgt = lov->lov_tgts[index];
 362                 if (!tgt)
 363                         continue;
 364                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 365                         break;
 366         }
 367
 368         if (index == lov->desc.ld_tgt_count)
 369                 GOTO(out, index = -EINVAL);
 370
 371         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 372                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 373
 374                 /*
 375                  * LU-642, initially inactive OSC could miss the obd_connect,
 376                  * we make up for it here.
 377                  */
 378                 if (activate && !tgt->ltd_exp) {
 379                         int rc;
 380                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 381
 382                         rc = obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 383                                          &lov_osc_uuid, &lov->lov_ocd, NULL);
 384                         if (rc || tgt->ltd_exp == NULL)
 385                                 GOTO(out, index = rc);
 386                         rc = obd_set_info_async(NULL, tgt->ltd_exp,
 387                                                 sizeof(KEY_CACHE_SET),
 388                                                 KEY_CACHE_SET,
 389                                                 sizeof(struct cl_client_cache),
 390                                                 lov->lov_cache, NULL);
 391                         if (rc < 0)
 392                                 GOTO(out, index = rc);
 393                 }
 394
 395                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 396                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 397                                uuid->uuid, activate ? "" : "de");
 398                 } else {
 399                         lov->lov_tgts[index]->ltd_activate = activate;
 400                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 401                                activate ? "" : "de", obd_uuid2str(uuid));
 402                 }
 403
 404         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 405                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 406
 407                 if (lov->lov_tgts[index]->ltd_active == active) {
 408                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 409                                uuid->uuid, active ? "" : "in");
 410                         GOTO(out, index);
 411                 } else {
 412                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 413                                obd_uuid2str(uuid), active ? "" : "in");
 414                 }
 415
 416                 lov->lov_tgts[index]->ltd_active = active;
 417                 if (active) {
 418                         lov->desc.ld_active_tgt_count++;
 419                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 420                 } else {
 421                         lov->desc.ld_active_tgt_count--;
 422                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 423                 }
 424         } else {
 425                 CERROR("%s: unknown event %d for uuid %s\n", obd->obd_name,
 426                        ev, uuid->uuid);
 427         }
 428
 429         if (tgt->ltd_exp)
 430                 CDEBUG(D_INFO, "%s: lov idx %d conn %llx\n", obd_uuid2str(uuid),
 431                        index, tgt->ltd_exp->exp_handle.h_cookie);
 432
 433  out:
 434         lov_tgts_putref(obd);
 435         RETURN(index);
 436 }
 437
 438 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 439                       enum obd_notify_event ev)
 440 {
 441         int rc = 0;
 442         struct lov_obd *lov = &obd->u.lov;
 443         ENTRY;
 444
 445         down_read(&lov->lov_notify_lock);
 446         if (!lov->lov_connects)
 447                 GOTO(out_notify_lock, rc = 0);
 448
 449         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 450             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 451                 struct obd_uuid *uuid;
 452
 453                 LASSERT(watched);
 454
 455                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 456                         CERROR("unexpected notification of %s %s\n",
 457                                watched->obd_type->typ_name, watched->obd_name);
 458                         GOTO(out_notify_lock, rc = -EINVAL);
 459                 }
 460
 461                 uuid = &watched->u.cli.cl_target_uuid;
 462
 463                 /* Set OSC as active before notifying the observer, so the
 464                  * observer can use the OSC normally.
 465                  */
 466                 rc = lov_set_osc_active(obd, uuid, ev);
 467                 if (rc < 0) {
 468                         CERROR("%s: event %d failed: rc = %d\n", obd->obd_name,
 469                                ev, rc);
 470                         GOTO(out_notify_lock, rc);
 471                 }
 472         }
 473
 474         /* Pass the notification up the chain. */
 475         rc = obd_notify_observer(obd, watched, ev);
 476
 477 out_notify_lock:
 478         up_read(&lov->lov_notify_lock);
 479
 480         RETURN(rc);
 481 }
 482
 483 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 484                           u32 index, int gen, int active)
 485 {
 486         struct lov_obd *lov = &obd->u.lov;
 487         struct lov_tgt_desc *tgt;
 488         struct obd_device *tgt_obd;
 489         int rc;
 490
 491         ENTRY;
 492         CDEBUG(D_CONFIG, "uuid:%s idx:%u gen:%d active:%d\n",
 493                uuidp->uuid, index, gen, active);
 494
 495         if (gen <= 0) {
 496                 CERROR("%s: request to add '%s' with invalid generation: %d\n",
 497                        obd->obd_name, uuidp->uuid, gen);
 498                 RETURN(-EINVAL);
 499         }
 500
 501         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME, &obd->obd_uuid);
 502         if (tgt_obd == NULL)
 503                 RETURN(-EINVAL);
 504
 505         mutex_lock(&lov->lov_lock);
 506
 507         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 508                 tgt = lov->lov_tgts[index];
 509                 rc = -EEXIST;
 510                 CERROR("%s: UUID %s already assigned at index %d: rc = %d\n",
 511                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), index, rc);
 512                 mutex_unlock(&lov->lov_lock);
 513                 RETURN(rc);
 514         }
 515
 516         if (index >= lov->lov_tgt_size) {
 517                 /* We need to reallocate the lov target array. */
 518                 struct lov_tgt_desc **newtgts, **old = NULL;
 519                 __u32 newsize, oldsize = 0;
 520
 521                 newsize = max(lov->lov_tgt_size, (__u32)2);
 522                 while (newsize < index + 1)
 523                         newsize = newsize << 1;
 524                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 525                 if (newtgts == NULL) {
 526                         mutex_unlock(&lov->lov_lock);
 527                         RETURN(-ENOMEM);
 528                 }
 529
 530                 if (lov->lov_tgt_size) {
 531                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 532                                lov->lov_tgt_size);
 533                         old = lov->lov_tgts;
 534                         oldsize = lov->lov_tgt_size;
 535                 }
 536
 537                 lov->lov_tgts = newtgts;
 538                 lov->lov_tgt_size = newsize;
 539                 smp_rmb();
 540                 if (old)
 541                         OBD_FREE(old, sizeof(*old) * oldsize);
 542
 543                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 544                        lov->lov_tgts, lov->lov_tgt_size);
 545         }
 546
 547         OBD_ALLOC_PTR(tgt);
 548         if (!tgt) {
 549                 mutex_unlock(&lov->lov_lock);
 550                 RETURN(-ENOMEM);
 551         }
 552
 553         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 554         if (rc) {
 555                 mutex_unlock(&lov->lov_lock);
 556                 OBD_FREE_PTR(tgt);
 557                 RETURN(rc);
 558         }
 559
 560         tgt->ltd_uuid = *uuidp;
 561         tgt->ltd_obd = tgt_obd;
 562         /* XXX - add a sanity check on the generation number. */
 563         tgt->ltd_gen = gen;
 564         tgt->ltd_index = index;
 565         tgt->ltd_activate = active;
 566         lov->lov_tgts[index] = tgt;
 567         if (index >= lov->desc.ld_tgt_count)
 568                 lov->desc.ld_tgt_count = index + 1;
 569
 570         mutex_unlock(&lov->lov_lock);
 571
 572         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 573                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 574
 575         if (lov->lov_connects == 0) {
 576                 /* lov_connect hasn't been called yet. We'll do the
 577                    lov_connect_obd on this target when that fn first runs,
 578                    because we don't know the connect flags yet. */
 579                 RETURN(0);
 580         }
 581
 582         lov_tgts_getref(obd);
 583
 584         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 585         if (rc)
 586                 GOTO(out, rc);
 587
 588         /* connect to administrative disabled ost */
 589         if (!tgt->ltd_exp)
 590                 GOTO(out, rc = 0);
 591
 592         if (lov->lov_cache != NULL) {
 593                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 594                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 595                                 sizeof(struct cl_client_cache), lov->lov_cache,
 596                                 NULL);
 597                 if (rc < 0)
 598                         GOTO(out, rc);
 599         }
 600
 601         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 602                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE);
 603
 604 out:
 605         if (rc) {
 606                 CERROR("%s: add failed, deleting %s: rc = %d\n",
 607                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), rc);
 608                 lov_del_target(obd, index, NULL, 0);
 609         }
 610         lov_tgts_putref(obd);
 611         RETURN(rc);
 612 }
 613
 614 /* Schedule a target for deletion */
 615 int lov_del_target(struct obd_device *obd, u32 index,
 616                    struct obd_uuid *uuidp, int gen)
 617 {
 618         struct lov_obd *lov = &obd->u.lov;
 619         int count = lov->desc.ld_tgt_count;
 620         int rc = 0;
 621         ENTRY;
 622
 623         if (index >= count) {
 624                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 625                        index, count);
 626                 RETURN(-EINVAL);
 627         }
 628
 629         /* to make sure there's no ongoing lov_notify() now */
 630         down_write(&lov->lov_notify_lock);
 631         lov_tgts_getref(obd);
 632
 633         if (!lov->lov_tgts[index]) {
 634                 CERROR("LOV target at index %d is not setup.\n", index);
 635                 GOTO(out, rc = -EINVAL);
 636         }
 637
 638         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 639                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 640                        lov_uuid2str(lov, index), index,
 641                        obd_uuid2str(uuidp));
 642                 GOTO(out, rc = -EINVAL);
 643         }
 644
 645         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 646                lov_uuid2str(lov, index), index,
 647                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 648                lov->lov_tgts[index]->ltd_active);
 649
 650         lov->lov_tgts[index]->ltd_reap = 1;
 651         lov->lov_death_row++;
 652         /* we really delete it from lov_tgts_putref() */
 653 out:
 654         lov_tgts_putref(obd);
 655         up_write(&lov->lov_notify_lock);
 656
 657         RETURN(rc);
 658 }
 659
 660 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 661 {
 662         struct obd_device *osc_obd;
 663
 664         LASSERT(tgt);
 665         LASSERT(tgt->ltd_reap);
 666
 667         osc_obd = class_exp2obd(tgt->ltd_exp);
 668
 669         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 670                tgt->ltd_uuid.uuid,
 671                osc_obd ? osc_obd->obd_name : "<no obd>");
 672
 673         if (tgt->ltd_exp)
 674                 lov_disconnect_obd(obd, tgt);
 675
 676         OBD_FREE_PTR(tgt);
 677
 678         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 679            do it ourselves. And we can't do it from lov_cleanup,
 680            because we just lost our only reference to it. */
 681         if (osc_obd)
 682                 class_manual_cleanup(osc_obd);
 683 }
 684
 685 void lov_fix_desc_stripe_size(__u64 *val)
 686 {
 687         if (*val < LOV_MIN_STRIPE_SIZE) {
 688                 if (*val != 0)
 689                         LCONSOLE_INFO("Increasing default stripe size to "
 690                                       "minimum %u\n",
 691                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 692                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 693         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 694                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 695                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
 696                               "multiple of %u)\n",
 697                               *val, LOV_MIN_STRIPE_SIZE);
 698         }
 699 }
 700
 701 void lov_fix_desc_stripe_count(__u32 *val)
 702 {
 703         if (*val == 0)
 704                 *val = 1;
 705 }
 706
 707 void lov_fix_desc_pattern(__u32 *val)
 708 {
 709         /* from lov_setstripe */
 710         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 711                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 712                 *val = 0;
 713         }
 714 }
 715
 716 void lov_fix_desc_qos_maxage(__u32 *val)
 717 {
 718         if (*val == 0)
 719                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 720 }
 721
 722 void lov_fix_desc(struct lov_desc *desc)
 723 {
 724         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 725         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 726         lov_fix_desc_pattern(&desc->ld_pattern);
 727         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 728 }
 729
 730 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 731 {
 732         struct lov_desc *desc;
 733         struct lov_obd *lov = &obd->u.lov;
 734         int rc;
 735         ENTRY;
 736
 737         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 738                 CERROR("LOV setup requires a descriptor\n");
 739                 RETURN(-EINVAL);
 740         }
 741
 742         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 743
 744         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 745                 CERROR("descriptor size wrong: %d > %d\n",
 746                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 747                 RETURN(-EINVAL);
 748         }
 749
 750         if (desc->ld_magic != LOV_DESC_MAGIC) {
 751                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 752                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 753                                    obd->obd_name, desc);
 754                             lustre_swab_lov_desc(desc);
 755                 } else {
 756                         CERROR("%s: Bad lov desc magic: %#x\n",
 757                                obd->obd_name, desc->ld_magic);
 758                         RETURN(-EINVAL);
 759                 }
 760         }
 761
 762         lov_fix_desc(desc);
 763
 764         desc->ld_active_tgt_count = 0;
 765         lov->desc = *desc;
 766         lov->lov_tgt_size = 0;
 767
 768         mutex_init(&lov->lov_lock);
 769         atomic_set(&lov->lov_refcount, 0);
 770         lov->lov_sp_me = LUSTRE_SP_CLI;
 771
 772         init_rwsem(&lov->lov_notify_lock);
 773
 774         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 775                                                    HASH_POOLS_MAX_BITS,
 776                                                    HASH_POOLS_BKT_BITS, 0,
 777                                                    CFS_HASH_MIN_THETA,
 778                                                    CFS_HASH_MAX_THETA,
 779                                                    &pool_hash_operations,
 780                                                    CFS_HASH_DEFAULT);
 781         INIT_LIST_HEAD(&lov->lov_pool_list);
 782         lov->lov_pool_count = 0;
 783         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 784         if (rc)
 785                 GOTO(out, rc);
 786
 787         rc = lov_tunables_init(obd);
 788         if (rc)
 789                 GOTO(out, rc);
 790
 791         lov->lov_tgts_kobj = kobject_create_and_add("target_obds",
 792                                                     &obd->obd_kset.kobj);
 793
 794 out:
 795         return rc;
 796 }
 797
 798 static int lov_cleanup(struct obd_device *obd)
 799 {
 800         struct lov_obd *lov = &obd->u.lov;
 801         struct list_head *pos, *tmp;
 802         struct pool_desc *pool;
 803         ENTRY;
 804
 805         if (lov->lov_tgts_kobj) {
 806                 kobject_put(lov->lov_tgts_kobj);
 807                 lov->lov_tgts_kobj = NULL;
 808         }
 809
 810         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 811                 pool = list_entry(pos, struct pool_desc, pool_list);
 812                 /* free pool structs */
 813                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 814                 /* In the function below, .hs_keycmp resolves to
 815                  * pool_hashkey_keycmp() */
 816                 /* coverity[overrun-buffer-val] */
 817                 lov_pool_del(obd, pool->pool_name);
 818         }
 819         cfs_hash_putref(lov->lov_pools_hash_body);
 820         lov_ost_pool_free(&lov->lov_packed);
 821
 822         lprocfs_obd_cleanup(obd);
 823         if (lov->lov_tgts) {
 824                 int i;
 825                 lov_tgts_getref(obd);
 826                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 827                         if (!lov->lov_tgts[i])
 828                                 continue;
 829
 830                         /* Inactive targets may never have connected */
 831                         if (lov->lov_tgts[i]->ltd_active ||
 832                             atomic_read(&lov->lov_refcount))
 833                                 /* We should never get here - these
 834                                  * should have been removed in the
 835                                  * disconnect. */
 836                                 CERROR("%s: lov tgt %d not cleaned! "
 837                                        "deathrow=%d, lovrc=%d\n",
 838                                        obd->obd_name, i, lov->lov_death_row,
 839                                        atomic_read(&lov->lov_refcount));
 840                         lov_del_target(obd, i, NULL, 0);
 841                 }
 842                 lov_tgts_putref(obd);
 843                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 844                          lov->lov_tgt_size);
 845                 lov->lov_tgt_size = 0;
 846         }
 847
 848         if (lov->lov_cache != NULL) {
 849                 cl_cache_decref(lov->lov_cache);
 850                 lov->lov_cache = NULL;
 851         }
 852
 853         RETURN(0);
 854 }
 855
 856 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 857                             u32 *indexp, int *genp)
 858 {
 859         struct obd_uuid obd_uuid;
 860         int cmd;
 861         int rc = 0;
 862
 863         ENTRY;
 864         switch (cmd = lcfg->lcfg_command) {
 865         case LCFG_ADD_MDC:
 866         case LCFG_DEL_MDC:
 867                 break;
 868         case LCFG_LOV_ADD_OBD:
 869         case LCFG_LOV_ADD_INA:
 870         case LCFG_LOV_DEL_OBD: {
 871                 u32 index;
 872                 int gen;
 873
 874                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 875                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
 876                         GOTO(out, rc = -EINVAL);
 877
 878                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 879
 880                 rc = kstrtou32(lustre_cfg_buf(lcfg, 2), 10, indexp);
 881                 if (rc)
 882                         GOTO(out, rc);
 883                 rc = kstrtoint(lustre_cfg_buf(lcfg, 3), 10, genp);
 884                 if (rc)
 885                         GOTO(out, rc);
 886                 index = *indexp;
 887                 gen = *genp;
 888                 if (cmd == LCFG_LOV_ADD_OBD)
 889                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 890                 else if (cmd == LCFG_LOV_ADD_INA)
 891                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 892                 else
 893                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 894
 895                 GOTO(out, rc);
 896         }
 897         case LCFG_PARAM: {
 898                 struct lov_desc *desc = &(obd->u.lov.desc);
 899                 ssize_t count;
 900
 901                 if (!desc)
 902                         GOTO(out, rc = -EINVAL);
 903
 904                 count = class_modify_config(lcfg, PARAM_LOV,
 905                                             &obd->obd_kset.kobj);
 906                 GOTO(out, rc = count < 0 ? count : 0);
 907         }
 908         case LCFG_POOL_NEW:
 909         case LCFG_POOL_ADD:
 910         case LCFG_POOL_DEL:
 911         case LCFG_POOL_REM:
 912                 GOTO(out, rc);
 913
 914         default: {
 915                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 916                 GOTO(out, rc = -EINVAL);
 917
 918         }
 919         }
 920 out:
 921         RETURN(rc);
 922 }
 923
 924 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
 925                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
 926 {
 927         struct obd_device *obd = class_exp2obd(exp);
 928         struct lov_obd *lov = &obd->u.lov;
 929         struct obd_info oinfo = {
 930                 .oi_osfs = osfs,
 931                 .oi_flags = flags,
 932         };
 933         struct ptlrpc_request_set *rqset;
 934         struct lov_request_set *set = NULL;
 935         struct lov_request *req;
 936         int rc = 0;
 937         int rc2;
 938
 939         ENTRY;
 940
 941         rqset = ptlrpc_prep_set();
 942         if (rqset == NULL)
 943                 RETURN(-ENOMEM);
 944
 945         rc = lov_prep_statfs_set(obd, &oinfo, &set);
 946         if (rc < 0)
 947                 GOTO(out_rqset, rc);
 948
 949         list_for_each_entry(req, &set->set_list, rq_link) {
 950                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
 951                                       &req->rq_oi, max_age, rqset);
 952                 if (rc < 0)
 953                         GOTO(out_set, rc);
 954         }
 955
 956         rc = ptlrpc_set_wait(env, rqset);
 957
 958 out_set:
 959         if (rc < 0)
 960                 atomic_set(&set->set_completes, 0);
 961
 962         rc2 = lov_fini_statfs_set(set);
 963         if (rc == 0)
 964                 rc = rc2;
 965
 966 out_rqset:
 967         ptlrpc_set_destroy(rqset);
 968
 969         RETURN(rc);
 970 }
 971
 972 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
 973                          void *karg, void __user *uarg)
 974 {
 975         struct obd_device *obd = class_exp2obd(exp);
 976         struct lov_obd *lov = &obd->u.lov;
 977         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
 978         struct obd_uuid *uuidp;
 979
 980         ENTRY;
 981         switch (cmd) {
 982         case IOC_OBD_STATFS: {
 983                 struct obd_ioctl_data *data = karg;
 984                 struct obd_device *osc_obd;
 985                 struct obd_statfs stat_buf = {0};
 986                 struct obd_import *imp;
 987                 __u32 index;
 988                 __u32 flags;
 989
 990                 memcpy(&index, data->ioc_inlbuf2, sizeof(index));
 991                 if (index >= count)
 992                         RETURN(-ENODEV);
 993
 994                 if (!lov->lov_tgts[index])
 995                         /* Try again with the next index */
 996                         RETURN(-EAGAIN);
 997
 998                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
 999                 if (!osc_obd)
1000                         RETURN(-EINVAL);
1001
1002                 imp = osc_obd->u.cli.cl_import;
1003                 if (!lov->lov_tgts[index]->ltd_active &&
1004                     imp->imp_state != LUSTRE_IMP_IDLE)
1005                         RETURN(-ENODATA);
1006
1007                 /* copy UUID */
1008                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1009                                  min_t(unsigned long, data->ioc_plen2,
1010                                        sizeof(struct obd_uuid))))
1011                         RETURN(-EFAULT);
1012
1013                 memcpy(&flags, data->ioc_inlbuf1, sizeof(flags));
1014                 flags = flags & LL_STATFS_NODELAY ? OBD_STATFS_NODELAY : 0;
1015
1016                 /* got statfs data */
1017                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1018                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
1019                                 flags);
1020                 if (rc)
1021                         RETURN(rc);
1022                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1023                                  min_t(unsigned long, data->ioc_plen1,
1024                                        sizeof(struct obd_statfs))))
1025                         RETURN(-EFAULT);
1026                 break;
1027         }
1028         case OBD_IOC_LOV_GET_CONFIG: {
1029                 struct obd_ioctl_data *data;
1030                 struct lov_desc *desc;
1031                 char *buf = NULL;
1032                 __u32 *genp;
1033
1034                 len = 0;
1035                 if (obd_ioctl_getdata(&buf, &len, uarg))
1036                         RETURN(-EINVAL);
1037
1038                 data = (struct obd_ioctl_data *)buf;
1039
1040                 if (sizeof(*desc) > data->ioc_inllen1) {
1041                         OBD_FREE_LARGE(buf, len);
1042                         RETURN(-EINVAL);
1043                 }
1044
1045                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1046                         OBD_FREE_LARGE(buf, len);
1047                         RETURN(-EINVAL);
1048                 }
1049
1050                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1051                         OBD_FREE_LARGE(buf, len);
1052                         RETURN(-EINVAL);
1053                 }
1054
1055                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1056                 memcpy(desc, &(lov->desc), sizeof(*desc));
1057
1058                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1059                 genp = (__u32 *)data->ioc_inlbuf3;
1060                 /* the uuid will be empty for deleted OSTs */
1061                 for (i = 0; i < count; i++, uuidp++, genp++) {
1062                         if (!lov->lov_tgts[i])
1063                                 continue;
1064                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1065                         *genp = lov->lov_tgts[i]->ltd_gen;
1066                 }
1067
1068                 if (copy_to_user(uarg, buf, len))
1069                         rc = -EFAULT;
1070                 OBD_FREE_LARGE(buf, len);
1071                 break;
1072         }
1073         case OBD_IOC_QUOTACTL: {
1074                 struct if_quotactl *qctl = karg;
1075                 struct lov_tgt_desc *tgt = NULL;
1076                 struct obd_quotactl *oqctl;
1077
1078                 if (qctl->qc_valid == QC_OSTIDX) {
1079                         if (count <= qctl->qc_idx)
1080                                 RETURN(-EINVAL);
1081
1082                         tgt = lov->lov_tgts[qctl->qc_idx];
1083                         if (!tgt || !tgt->ltd_exp)
1084                                 RETURN(-EINVAL);
1085                 } else if (qctl->qc_valid == QC_UUID) {
1086                         for (i = 0; i < count; i++) {
1087                                 tgt = lov->lov_tgts[i];
1088                                 if (!tgt ||
1089                                     !obd_uuid_equals(&tgt->ltd_uuid,
1090                                                      &qctl->obd_uuid))
1091                                         continue;
1092
1093                                 if (tgt->ltd_exp == NULL)
1094                                         RETURN(-EINVAL);
1095
1096                                 break;
1097                         }
1098                 } else {
1099                         RETURN(-EINVAL);
1100                 }
1101
1102                 if (i >= count)
1103                         RETURN(-EAGAIN);
1104
1105                 LASSERT(tgt && tgt->ltd_exp);
1106                 OBD_ALLOC_PTR(oqctl);
1107                 if (!oqctl)
1108                         RETURN(-ENOMEM);
1109
1110                 QCTL_COPY(oqctl, qctl);
1111                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1112                 if (rc == 0) {
1113                         QCTL_COPY(qctl, oqctl);
1114                         qctl->qc_valid = QC_OSTIDX;
1115                         qctl->obd_uuid = tgt->ltd_uuid;
1116                 }
1117                 OBD_FREE_PTR(oqctl);
1118                 break;
1119         }
1120         default: {
1121                 int set = 0;
1122
1123                 if (count == 0)
1124                         RETURN(-ENOTTY);
1125
1126                 for (i = 0; i < count; i++) {
1127                         int err;
1128                         struct obd_device *osc_obd;
1129
1130                         /* OST was disconnected */
1131                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1132                                 continue;
1133
1134                         /* ll_umount_begin() sets force on lov, pass to osc */
1135                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1136                         osc_obd->obd_force = obd->obd_force;
1137                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1138                                             len, karg, uarg);
1139                         if (err) {
1140                                 if (lov->lov_tgts[i]->ltd_active) {
1141                                         CDEBUG(err == -ENOTTY ?
1142                                                D_IOCTL : D_WARNING,
1143                                                "iocontrol OSC %s on OST "
1144                                                "idx %d cmd %x: err = %d\n",
1145                                                lov_uuid2str(lov, i),
1146                                                i, cmd, err);
1147                                         if (!rc)
1148                                                 rc = err;
1149                                 }
1150                         } else {
1151                                 set = 1;
1152                         }
1153                 }
1154                 if (!set && !rc)
1155                         rc = -EIO;
1156         }
1157         }
1158
1159         RETURN(rc);
1160 }
1161
1162 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1163                         __u32 keylen, void *key, __u32 *vallen, void *val)
1164 {
1165         struct obd_device *obddev = class_exp2obd(exp);
1166         struct lov_obd *lov = &obddev->u.lov;
1167         struct lov_desc *ld = &lov->desc;
1168         int rc = 0;
1169         ENTRY;
1170
1171         if (vallen == NULL || val == NULL)
1172                 RETURN(-EFAULT);
1173
1174         lov_tgts_getref(obddev);
1175
1176         if (KEY_IS(KEY_MAX_EASIZE)) {
1177                 u32 max_stripe_count = min_t(u32, ld->ld_active_tgt_count,
1178                                              LOV_MAX_STRIPE_COUNT);
1179
1180                 *((u32 *)val) = lov_mds_md_size(max_stripe_count, LOV_MAGIC_V3);
1181         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
1182                 u32 def_stripe_count = min_t(u32, ld->ld_default_stripe_count,
1183                                              LOV_MAX_STRIPE_COUNT);
1184
1185                 *((u32 *)val) = lov_mds_md_size(def_stripe_count, LOV_MAGIC_V3);
1186         } else if (KEY_IS(KEY_TGT_COUNT)) {
1187                 *((int *)val) = lov->desc.ld_tgt_count;
1188         } else {
1189                 rc = -EINVAL;
1190         }
1191
1192         lov_tgts_putref(obddev);
1193
1194         RETURN(rc);
1195 }
1196
1197 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
1198                               __u32 keylen, void *key,
1199                               __u32 vallen, void *val,
1200                               struct ptlrpc_request_set *set)
1201 {
1202         struct obd_device *obddev = class_exp2obd(exp);
1203         struct lov_obd *lov = &obddev->u.lov;
1204         struct lov_tgt_desc *tgt;
1205         bool do_inactive = false, no_set = false;
1206         u32 i;
1207         int rc = 0;
1208         int err;
1209
1210         ENTRY;
1211
1212         if (set == NULL) {
1213                 no_set = true;
1214                 set = ptlrpc_prep_set();
1215                 if (!set)
1216                         RETURN(-ENOMEM);
1217         }
1218
1219         lov_tgts_getref(obddev);
1220
1221         if (KEY_IS(KEY_CHECKSUM)) {
1222                 do_inactive = true;
1223         } else if (KEY_IS(KEY_CACHE_SET)) {
1224                 LASSERT(lov->lov_cache == NULL);
1225                 lov->lov_cache = val;
1226                 do_inactive = true;
1227                 cl_cache_incref(lov->lov_cache);
1228         }
1229
1230         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1231                 tgt = lov->lov_tgts[i];
1232
1233                 /* OST was disconnected */
1234                 if (tgt == NULL || tgt->ltd_exp == NULL)
1235                         continue;
1236
1237                 /* OST is inactive and we don't want inactive OSCs */
1238                 if (!tgt->ltd_active && !do_inactive)
1239                         continue;
1240
1241                 err = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1242                                          vallen, val, set);
1243
1244                 if (rc == 0)
1245                         rc = err;
1246         }
1247
1248         /* cycle through MDC target for Data-on-MDT */
1249         for (i = 0; i < LOV_MDC_TGT_MAX; i++) {
1250                 struct obd_device *mdc;
1251
1252                 mdc = lov->lov_mdc_tgts[i].lmtd_mdc;
1253                 if (mdc == NULL)
1254                         continue;
1255
1256                 err = obd_set_info_async(env, mdc->obd_self_export,
1257                                          keylen, key, vallen, val, set);
1258                 if (rc == 0)
1259                         rc = err;
1260         }
1261
1262         lov_tgts_putref(obddev);
1263         if (no_set) {
1264                 err = ptlrpc_set_wait(env, set);
1265                 if (rc == 0)
1266                         rc = err;
1267                 ptlrpc_set_destroy(set);
1268         }
1269         RETURN(rc);
1270 }
1271
1272 void lov_stripe_lock(struct lov_stripe_md *md)
1273 __acquires(&md->lsm_lock)
1274 {
1275         LASSERT(md->lsm_lock_owner != current_pid());
1276         spin_lock(&md->lsm_lock);
1277         LASSERT(md->lsm_lock_owner == 0);
1278         md->lsm_lock_owner = current_pid();
1279 }
1280
1281 void lov_stripe_unlock(struct lov_stripe_md *md)
1282 __releases(&md->lsm_lock)
1283 {
1284         LASSERT(md->lsm_lock_owner == current_pid());
1285         md->lsm_lock_owner = 0;
1286         spin_unlock(&md->lsm_lock);
1287 }
1288
1289 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
1290                         struct obd_quotactl *oqctl)
1291 {
1292         struct lov_obd      *lov = &obd->u.lov;
1293         struct lov_tgt_desc *tgt;
1294         __u64                curspace = 0;
1295         __u64                bhardlimit = 0;
1296         int                  i, rc = 0;
1297         ENTRY;
1298
1299         if (oqctl->qc_cmd != Q_GETOQUOTA &&
1300             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA) {
1301                 CERROR("%s: bad quota opc %x for lov obd\n",
1302                        obd->obd_name, oqctl->qc_cmd);
1303                 RETURN(-EFAULT);
1304         }
1305
1306         /* for lov tgt */
1307         lov_tgts_getref(obd);
1308         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1309                 int err;
1310
1311                 tgt = lov->lov_tgts[i];
1312
1313                 if (!tgt)
1314                         continue;
1315
1316                 if (!tgt->ltd_active || tgt->ltd_reap) {
1317                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
1318                             lov->lov_tgts[i]->ltd_activate) {
1319                                 rc = -ENETDOWN;
1320                                 CERROR("ost %d is inactive\n", i);
1321                         } else {
1322                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
1323                         }
1324                         continue;
1325                 }
1326
1327                 err = obd_quotactl(tgt->ltd_exp, oqctl);
1328                 if (err) {
1329                         if (tgt->ltd_active && !rc)
1330                                 rc = err;
1331                         continue;
1332                 }
1333
1334                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
1335                         curspace += oqctl->qc_dqblk.dqb_curspace;
1336                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
1337                 }
1338         }
1339         lov_tgts_putref(obd);
1340
1341         if (oqctl->qc_cmd == Q_GETOQUOTA) {
1342                 oqctl->qc_dqblk.dqb_curspace = curspace;
1343                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
1344         }
1345         RETURN(rc);
1346 }
1347
1348 static struct obd_ops lov_obd_ops = {
1349         .o_owner                = THIS_MODULE,
1350         .o_setup                = lov_setup,
1351         .o_cleanup              = lov_cleanup,
1352         .o_connect              = lov_connect,
1353         .o_disconnect           = lov_disconnect,
1354         .o_statfs               = lov_statfs,
1355         .o_iocontrol            = lov_iocontrol,
1356         .o_get_info             = lov_get_info,
1357         .o_set_info_async       = lov_set_info_async,
1358         .o_notify               = lov_notify,
1359         .o_pool_new             = lov_pool_new,
1360         .o_pool_rem             = lov_pool_remove,
1361         .o_pool_add             = lov_pool_add,
1362         .o_pool_del             = lov_pool_del,
1363         .o_quotactl             = lov_quotactl,
1364 };
1365
1366 struct kmem_cache *lov_oinfo_slab;
1367
1368 static int __init lov_init(void)
1369 {
1370         bool enable_proc = true;
1371         struct obd_type *type;
1372         int rc;
1373         ENTRY;
1374
1375         /* print an address of _any_ initialized kernel symbol from this
1376          * module, to allow debugging with gdb that doesn't support data
1377          * symbols from modules.*/
1378         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
1379
1380         rc = lu_kmem_init(lov_caches);
1381         if (rc)
1382                 return rc;
1383
1384         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
1385                                            sizeof(struct lov_oinfo), 0,
1386                                            SLAB_HWCACHE_ALIGN, NULL);
1387         if (lov_oinfo_slab == NULL) {
1388                 lu_kmem_fini(lov_caches);
1389                 return -ENOMEM;
1390         }
1391
1392         type = class_search_type(LUSTRE_LOD_NAME);
1393         if (type != NULL && type->typ_procsym != NULL)
1394                 enable_proc = false;
1395
1396         rc = class_register_type(&lov_obd_ops, NULL, enable_proc, NULL,
1397                                  LUSTRE_LOV_NAME, &lov_device_type);
1398
1399         if (rc) {
1400                 kmem_cache_destroy(lov_oinfo_slab);
1401                 lu_kmem_fini(lov_caches);
1402         }
1403
1404         RETURN(rc);
1405 }
1406
1407 static void __exit lov_exit(void)
1408 {
1409         class_unregister_type(LUSTRE_LOV_NAME);
1410         kmem_cache_destroy(lov_oinfo_slab);
1411         lu_kmem_fini(lov_caches);
1412 }
1413
1414 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1415 MODULE_DESCRIPTION("Lustre Logical Object Volume");
1416 MODULE_VERSION(LUSTRE_VERSION_STRING);
1417 MODULE_LICENSE("GPL");
1418
1419 module_init(lov_init);
1420 module_exit(lov_exit);