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