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