lustre/lov/lov_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/lov/lov_obd.c
  33  *
  34  * Author: Phil Schwan <phil@clusterfs.com>
  35  * Author: Peter Braam <braam@clusterfs.com>
  36  * Author: Mike Shaver <shaver@clusterfs.com>
  37  * Author: Nathan Rutman <nathan@clusterfs.com>
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_LOV
  41 #include <libcfs/libcfs.h>
  42
  43 #include <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->targets_proc_entry != NULL) {
 184                 struct proc_dir_entry *osc_symlink;
 185                 struct obd_device *osc_obd;
 186
 187                 osc_obd = lov->lov_tgts[index]->ltd_exp->exp_obd;
 188
 189                 LASSERT(osc_obd != NULL);
 190                 LASSERT(osc_obd->obd_magic == OBD_DEVICE_MAGIC);
 191                 LASSERT(osc_obd->obd_type->typ_name != NULL);
 192
 193                 osc_symlink = lprocfs_add_symlink(osc_obd->obd_name,
 194                                                   lov->targets_proc_entry,
 195                                                   "../../../%s/%s",
 196                                                   osc_obd->obd_type->typ_name,
 197                                                   osc_obd->obd_name);
 198                 if (osc_symlink == NULL) {
 199                         CERROR("cannot register LOV target "
 200                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 201                                obd->obd_type->typ_name, obd->obd_name,
 202                                osc_obd->obd_name);
 203                 }
 204         }
 205         RETURN(0);
 206 }
 207
 208 static int lov_connect(const struct lu_env *env,
 209                        struct obd_export **exp, struct obd_device *obd,
 210                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 211                        void *localdata)
 212 {
 213         struct lov_obd *lov = &obd->u.lov;
 214         struct lov_tgt_desc *tgt;
 215         struct lustre_handle conn;
 216         int i, rc;
 217         ENTRY;
 218
 219         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 220
 221         rc = class_connect(&conn, obd, cluuid);
 222         if (rc)
 223                 RETURN(rc);
 224
 225         *exp = class_conn2export(&conn);
 226
 227         /* Why should there ever be more than 1 connect? */
 228         lov->lov_connects++;
 229         LASSERT(lov->lov_connects == 1);
 230
 231         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 232         if (data)
 233                 lov->lov_ocd = *data;
 234
 235         lov->targets_proc_entry = lprocfs_register("target_obds",
 236                                                    obd->obd_proc_entry,
 237                                                    NULL, NULL);
 238         if (IS_ERR(lov->targets_proc_entry)) {
 239                 CERROR("%s: cannot register "
 240                        "/proc/fs/lustre/%s/%s/target_obds\n",
 241                        obd->obd_name, obd->obd_type->typ_name, obd->obd_name);
 242                 lov->targets_proc_entry = NULL;
 243         }
 244
 245         obd_getref(obd);
 246         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 247                 tgt = lov->lov_tgts[i];
 248                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 249                         continue;
 250                 /* Flags will be lowest common denominator */
 251                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 252                 if (rc) {
 253                         CERROR("%s: lov connect tgt %d failed: %d\n",
 254                                obd->obd_name, i, rc);
 255                         continue;
 256                 }
 257                 /* connect to administrative disabled ost */
 258                 if (!lov->lov_tgts[i]->ltd_exp)
 259                         continue;
 260
 261                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 262                                 OBD_NOTIFY_CONNECT);
 263                 if (rc) {
 264                         CERROR("%s error sending notify %d\n",
 265                                obd->obd_name, rc);
 266                 }
 267         }
 268         obd_putref(obd);
 269
 270         RETURN(0);
 271 }
 272
 273 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 274 {
 275         struct lov_obd *lov = &obd->u.lov;
 276         struct obd_device *osc_obd;
 277         int rc;
 278         ENTRY;
 279
 280         osc_obd = class_exp2obd(tgt->ltd_exp);
 281         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 282                obd->obd_name, osc_obd->obd_name);
 283
 284         if (tgt->ltd_active) {
 285                 tgt->ltd_active = 0;
 286                 lov->desc.ld_active_tgt_count--;
 287                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 288         }
 289
 290         if (osc_obd) {
 291                 /* Pass it on to our clients.
 292                  * XXX This should be an argument to disconnect,
 293                  * XXX not a back-door flag on the OBD.  Ah well.
 294                  */
 295                 osc_obd->obd_force = obd->obd_force;
 296                 osc_obd->obd_fail = obd->obd_fail;
 297                 osc_obd->obd_no_recov = obd->obd_no_recov;
 298
 299                 if (lov->targets_proc_entry != NULL)
 300                         lprocfs_remove_proc_entry(osc_obd->obd_name,
 301                                                   lov->targets_proc_entry);
 302         }
 303
 304         obd_register_observer(osc_obd, NULL);
 305
 306         rc = obd_disconnect(tgt->ltd_exp);
 307         if (rc) {
 308                 CERROR("Target %s disconnect error %d\n",
 309                        tgt->ltd_uuid.uuid, rc);
 310                 rc = 0;
 311         }
 312
 313         tgt->ltd_exp = NULL;
 314         RETURN(0);
 315 }
 316
 317 static int lov_disconnect(struct obd_export *exp)
 318 {
 319         struct obd_device *obd = class_exp2obd(exp);
 320         struct lov_obd *lov = &obd->u.lov;
 321         int i, rc;
 322         ENTRY;
 323
 324         if (!lov->lov_tgts)
 325                 goto out;
 326
 327         /* Only disconnect the underlying layers on the final disconnect. */
 328         lov->lov_connects--;
 329         if (lov->lov_connects != 0) {
 330                 /* why should there be more than 1 connect? */
 331                 CERROR("disconnect #%d\n", lov->lov_connects);
 332                 goto out;
 333         }
 334
 335         /* Let's hold another reference so lov_del_obd doesn't spin through
 336            putref every time */
 337         obd_getref(obd);
 338
 339         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 340                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 341                         /* Disconnection is the last we know about an obd */
 342                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
 343                 }
 344         }
 345         obd_putref(obd);
 346
 347         if (lov->targets_proc_entry != NULL)
 348                 lprocfs_remove(&lov->targets_proc_entry);
 349
 350 out:
 351         rc = class_disconnect(exp); /* bz 9811 */
 352         RETURN(rc);
 353 }
 354
 355 /* Error codes:
 356  *
 357  *  -EINVAL  : UUID can't be found in the LOV's target list
 358  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 359  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 360  *  any >= 0 : is log target index
 361  */
 362 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 363                               enum obd_notify_event ev)
 364 {
 365         struct lov_obd *lov = &obd->u.lov;
 366         struct lov_tgt_desc *tgt;
 367         int index, activate, active;
 368         ENTRY;
 369
 370         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 371                lov, uuid->uuid, ev);
 372
 373         obd_getref(obd);
 374         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 375                 tgt = lov->lov_tgts[index];
 376                 if (!tgt)
 377                         continue;
 378                 /*
 379                  * LU-642, initially inactive OSC could miss the obd_connect,
 380                  * we make up for it here.
 381                  */
 382                 if (ev == OBD_NOTIFY_ACTIVATE && tgt->ltd_exp == NULL &&
 383                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 384                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 385
 386                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 387                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 388                 }
 389                 if (!tgt->ltd_exp)
 390                         continue;
 391
 392                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 393                        index, obd_uuid2str(&tgt->ltd_uuid),
 394                        tgt->ltd_exp->exp_handle.h_cookie);
 395                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 396                         break;
 397         }
 398
 399         if (index == lov->desc.ld_tgt_count)
 400                 GOTO(out, index = -EINVAL);
 401
 402         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 403                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 404
 405                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 406                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 407                                uuid->uuid, activate ? "" : "de");
 408                 } else {
 409                         lov->lov_tgts[index]->ltd_activate = activate;
 410                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 411                                activate ? "" : "de", obd_uuid2str(uuid));
 412                 }
 413
 414         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 415                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 416
 417                 if (lov->lov_tgts[index]->ltd_active == active) {
 418                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 419                                uuid->uuid, active ? "" : "in");
 420                         GOTO(out, index);
 421                 } else {
 422                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 423                                obd_uuid2str(uuid), active ? "" : "in");
 424                 }
 425
 426                 lov->lov_tgts[index]->ltd_active = active;
 427                 if (active) {
 428                         lov->desc.ld_active_tgt_count++;
 429                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 430                 } else {
 431                         lov->desc.ld_active_tgt_count--;
 432                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 433                 }
 434         } else {
 435                 CERROR("%s: unknown event %d for uuid %s\n", obd->obd_name,
 436                        ev, uuid->uuid);
 437         }
 438
 439  out:
 440         obd_putref(obd);
 441         RETURN(index);
 442 }
 443
 444 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 445                       enum obd_notify_event ev)
 446 {
 447         int rc = 0;
 448         struct lov_obd *lov = &obd->u.lov;
 449         ENTRY;
 450
 451         down_read(&lov->lov_notify_lock);
 452         if (!lov->lov_connects)
 453                 GOTO(out_notify_lock, rc = 0);
 454
 455         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 456             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 457                 struct obd_uuid *uuid;
 458
 459                 LASSERT(watched);
 460
 461                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 462                         CERROR("unexpected notification of %s %s\n",
 463                                watched->obd_type->typ_name, watched->obd_name);
 464                         GOTO(out_notify_lock, rc = -EINVAL);
 465                 }
 466
 467                 uuid = &watched->u.cli.cl_target_uuid;
 468
 469                 /* Set OSC as active before notifying the observer, so the
 470                  * observer can use the OSC normally.
 471                  */
 472                 rc = lov_set_osc_active(obd, uuid, ev);
 473                 if (rc < 0) {
 474                         CERROR("%s: event %d failed: rc = %d\n", obd->obd_name,
 475                                ev, rc);
 476                         GOTO(out_notify_lock, rc);
 477                 }
 478         }
 479
 480         /* Pass the notification up the chain. */
 481         rc = obd_notify_observer(obd, watched, ev);
 482
 483 out_notify_lock:
 484         up_read(&lov->lov_notify_lock);
 485
 486         RETURN(rc);
 487 }
 488
 489 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 490                           __u32 index, int gen, int active)
 491 {
 492         struct lov_obd *lov = &obd->u.lov;
 493         struct lov_tgt_desc *tgt;
 494         struct obd_device *tgt_obd;
 495         int rc;
 496         ENTRY;
 497
 498         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 499                uuidp->uuid, index, gen, active);
 500
 501         if (gen <= 0) {
 502                 CERROR("request to add OBD %s with invalid generation: %d\n",
 503                        uuidp->uuid, gen);
 504                 RETURN(-EINVAL);
 505         }
 506
 507         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 508                                         &obd->obd_uuid);
 509         if (tgt_obd == NULL)
 510                 RETURN(-EINVAL);
 511
 512         mutex_lock(&lov->lov_lock);
 513
 514         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 515                 tgt = lov->lov_tgts[index];
 516                 CERROR("UUID %s already assigned at LOV target index %d\n",
 517                        obd_uuid2str(&tgt->ltd_uuid), index);
 518                 mutex_unlock(&lov->lov_lock);
 519                 RETURN(-EEXIST);
 520         }
 521
 522         if (index >= lov->lov_tgt_size) {
 523                 /* We need to reallocate the lov target array. */
 524                 struct lov_tgt_desc **newtgts, **old = NULL;
 525                 __u32 newsize, oldsize = 0;
 526
 527                 newsize = max(lov->lov_tgt_size, (__u32)2);
 528                 while (newsize < index + 1)
 529                         newsize = newsize << 1;
 530                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 531                 if (newtgts == NULL) {
 532                         mutex_unlock(&lov->lov_lock);
 533                         RETURN(-ENOMEM);
 534                 }
 535
 536                 if (lov->lov_tgt_size) {
 537                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 538                                lov->lov_tgt_size);
 539                         old = lov->lov_tgts;
 540                         oldsize = lov->lov_tgt_size;
 541                 }
 542
 543                 lov->lov_tgts = newtgts;
 544                 lov->lov_tgt_size = newsize;
 545                 smp_rmb();
 546                 if (old)
 547                         OBD_FREE(old, sizeof(*old) * oldsize);
 548
 549                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 550                        lov->lov_tgts, lov->lov_tgt_size);
 551         }
 552
 553         OBD_ALLOC_PTR(tgt);
 554         if (!tgt) {
 555                 mutex_unlock(&lov->lov_lock);
 556                 RETURN(-ENOMEM);
 557         }
 558
 559         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 560         if (rc) {
 561                 mutex_unlock(&lov->lov_lock);
 562                 OBD_FREE_PTR(tgt);
 563                 RETURN(rc);
 564         }
 565
 566         tgt->ltd_uuid = *uuidp;
 567         tgt->ltd_obd = tgt_obd;
 568         /* XXX - add a sanity check on the generation number. */
 569         tgt->ltd_gen = gen;
 570         tgt->ltd_index = index;
 571         tgt->ltd_activate = active;
 572         lov->lov_tgts[index] = tgt;
 573         if (index >= lov->desc.ld_tgt_count)
 574                 lov->desc.ld_tgt_count = index + 1;
 575
 576         mutex_unlock(&lov->lov_lock);
 577
 578         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 579                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 580
 581         if (lov->lov_connects == 0) {
 582                 /* lov_connect hasn't been called yet. We'll do the
 583                    lov_connect_obd on this target when that fn first runs,
 584                    because we don't know the connect flags yet. */
 585                 RETURN(0);
 586         }
 587
 588         obd_getref(obd);
 589
 590         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 591         if (rc)
 592                 GOTO(out, rc);
 593
 594         /* connect to administrative disabled ost */
 595         if (!tgt->ltd_exp)
 596                 GOTO(out, rc = 0);
 597
 598         if (lov->lov_cache != NULL) {
 599                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 600                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 601                                 sizeof(struct cl_client_cache), lov->lov_cache,
 602                                 NULL);
 603                 if (rc < 0)
 604                         GOTO(out, rc);
 605         }
 606
 607         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 608                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE);
 609
 610 out:
 611         if (rc) {
 612                 CERROR("add failed (%d), deleting %s\n", rc,
 613                        obd_uuid2str(&tgt->ltd_uuid));
 614                 lov_del_target(obd, index, NULL, 0);
 615         }
 616         obd_putref(obd);
 617         RETURN(rc);
 618 }
 619
 620 /* Schedule a target for deletion */
 621 int lov_del_target(struct obd_device *obd, __u32 index,
 622                    struct obd_uuid *uuidp, int gen)
 623 {
 624         struct lov_obd *lov = &obd->u.lov;
 625         int count = lov->desc.ld_tgt_count;
 626         int rc = 0;
 627         ENTRY;
 628
 629         if (index >= count) {
 630                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 631                        index, count);
 632                 RETURN(-EINVAL);
 633         }
 634
 635         /* to make sure there's no ongoing lov_notify() now */
 636         down_write(&lov->lov_notify_lock);
 637         obd_getref(obd);
 638
 639         if (!lov->lov_tgts[index]) {
 640                 CERROR("LOV target at index %d is not setup.\n", index);
 641                 GOTO(out, rc = -EINVAL);
 642         }
 643
 644         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 645                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 646                        lov_uuid2str(lov, index), index,
 647                        obd_uuid2str(uuidp));
 648                 GOTO(out, rc = -EINVAL);
 649         }
 650
 651         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 652                lov_uuid2str(lov, index), index,
 653                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 654                lov->lov_tgts[index]->ltd_active);
 655
 656         lov->lov_tgts[index]->ltd_reap = 1;
 657         lov->lov_death_row++;
 658         /* we really delete it from obd_putref */
 659 out:
 660         obd_putref(obd);
 661         up_write(&lov->lov_notify_lock);
 662
 663         RETURN(rc);
 664 }
 665
 666 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 667 {
 668         struct obd_device *osc_obd;
 669
 670         LASSERT(tgt);
 671         LASSERT(tgt->ltd_reap);
 672
 673         osc_obd = class_exp2obd(tgt->ltd_exp);
 674
 675         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 676                tgt->ltd_uuid.uuid,
 677                osc_obd ? osc_obd->obd_name : "<no obd>");
 678
 679         if (tgt->ltd_exp)
 680                 lov_disconnect_obd(obd, tgt);
 681
 682         OBD_FREE_PTR(tgt);
 683
 684         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 685            do it ourselves. And we can't do it from lov_cleanup,
 686            because we just lost our only reference to it. */
 687         if (osc_obd)
 688                 class_manual_cleanup(osc_obd);
 689 }
 690
 691 void lov_fix_desc_stripe_size(__u64 *val)
 692 {
 693         if (*val < LOV_MIN_STRIPE_SIZE) {
 694                 if (*val != 0)
 695                         LCONSOLE_INFO("Increasing default stripe size to "
 696                                       "minimum %u\n",
 697                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 698                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 699         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 700                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 701                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
 702                               "multiple of %u)\n",
 703                               *val, LOV_MIN_STRIPE_SIZE);
 704         }
 705 }
 706
 707 void lov_fix_desc_stripe_count(__u32 *val)
 708 {
 709         if (*val == 0)
 710                 *val = 1;
 711 }
 712
 713 void lov_fix_desc_pattern(__u32 *val)
 714 {
 715         /* from lov_setstripe */
 716         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 717                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 718                 *val = 0;
 719         }
 720 }
 721
 722 void lov_fix_desc_qos_maxage(__u32 *val)
 723 {
 724         if (*val == 0)
 725                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 726 }
 727
 728 void lov_fix_desc(struct lov_desc *desc)
 729 {
 730         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 731         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 732         lov_fix_desc_pattern(&desc->ld_pattern);
 733         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 734 }
 735
 736 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 737 {
 738         struct lov_desc *desc;
 739         struct lov_obd *lov = &obd->u.lov;
 740 #ifdef CONFIG_PROC_FS
 741         struct obd_type *type;
 742 #endif
 743         int rc;
 744         ENTRY;
 745
 746         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 747                 CERROR("LOV setup requires a descriptor\n");
 748                 RETURN(-EINVAL);
 749         }
 750
 751         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 752
 753         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 754                 CERROR("descriptor size wrong: %d > %d\n",
 755                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 756                 RETURN(-EINVAL);
 757         }
 758
 759         if (desc->ld_magic != LOV_DESC_MAGIC) {
 760                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 761                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 762                                    obd->obd_name, desc);
 763                             lustre_swab_lov_desc(desc);
 764                 } else {
 765                         CERROR("%s: Bad lov desc magic: %#x\n",
 766                                obd->obd_name, desc->ld_magic);
 767                         RETURN(-EINVAL);
 768                 }
 769         }
 770
 771         lov_fix_desc(desc);
 772
 773         desc->ld_active_tgt_count = 0;
 774         lov->desc = *desc;
 775         lov->lov_tgt_size = 0;
 776
 777         mutex_init(&lov->lov_lock);
 778         atomic_set(&lov->lov_refcount, 0);
 779         lov->lov_sp_me = LUSTRE_SP_CLI;
 780
 781         init_rwsem(&lov->lov_notify_lock);
 782
 783         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 784                                                    HASH_POOLS_MAX_BITS,
 785                                                    HASH_POOLS_BKT_BITS, 0,
 786                                                    CFS_HASH_MIN_THETA,
 787                                                    CFS_HASH_MAX_THETA,
 788                                                    &pool_hash_operations,
 789                                                    CFS_HASH_DEFAULT);
 790         INIT_LIST_HEAD(&lov->lov_pool_list);
 791         lov->lov_pool_count = 0;
 792         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 793         if (rc)
 794                 GOTO(out, rc);
 795
 796 #ifdef CONFIG_PROC_FS
 797         obd->obd_vars = lprocfs_lov_obd_vars;
 798         /* If this is true then both client (lov) and server
 799          * (lod) are on the same node. The lod layer if loaded
 800          * first will register the lov proc directory. In that
 801          * case obd->obd_type->typ_procroot will be not set.
 802          * Instead we use type->typ_procsym as the parent.
 803          */
 804         type = class_search_type(LUSTRE_LOD_NAME);
 805         if (type && type->typ_procsym) {
 806                 obd->obd_proc_entry = lprocfs_register(obd->obd_name,
 807                                                        type->typ_procsym,
 808                                                        obd->obd_vars, obd);
 809                 if (IS_ERR(obd->obd_proc_entry)) {
 810                         rc = PTR_ERR(obd->obd_proc_entry);
 811                         CERROR("error %d setting up lprocfs for %s\n", rc,
 812                                obd->obd_name);
 813                         obd->obd_proc_entry = NULL;
 814                 }
 815         }
 816
 817         rc = lprocfs_obd_setup(obd, false);
 818         if (!rc) {
 819                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
 820                                         0444, &lov_proc_target_fops, obd);
 821                 if (rc)
 822                         CWARN("Error adding the target_obd file\n");
 823
 824                 lov->lov_pool_proc_entry = lprocfs_register("pools",
 825                                                             obd->obd_proc_entry,
 826                                                             NULL, NULL);
 827                 if (IS_ERR(lov->lov_pool_proc_entry)) {
 828                         rc = PTR_ERR(lov->lov_pool_proc_entry);
 829                         CERROR("error %d setting up lprocfs for pools\n", rc);
 830                         lov->lov_pool_proc_entry = NULL;
 831                 }
 832         }
 833 #endif
 834         RETURN(0);
 835
 836 out:
 837         return rc;
 838 }
 839
 840 static int lov_cleanup(struct obd_device *obd)
 841 {
 842         struct lov_obd *lov = &obd->u.lov;
 843         struct list_head *pos, *tmp;
 844         struct pool_desc *pool;
 845         ENTRY;
 846
 847         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 848                 pool = list_entry(pos, struct pool_desc, pool_list);
 849                 /* free pool structs */
 850                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 851                 /* In the function below, .hs_keycmp resolves to
 852                  * pool_hashkey_keycmp() */
 853                 /* coverity[overrun-buffer-val] */
 854                 lov_pool_del(obd, pool->pool_name);
 855         }
 856         cfs_hash_putref(lov->lov_pools_hash_body);
 857         lov_ost_pool_free(&lov->lov_packed);
 858
 859         lprocfs_obd_cleanup(obd);
 860         if (lov->lov_tgts) {
 861                 int i;
 862                 obd_getref(obd);
 863                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 864                         if (!lov->lov_tgts[i])
 865                                 continue;
 866
 867                         /* Inactive targets may never have connected */
 868                         if (lov->lov_tgts[i]->ltd_active ||
 869                             atomic_read(&lov->lov_refcount))
 870                                 /* We should never get here - these
 871                                  * should have been removed in the
 872                                  * disconnect. */
 873                                 CERROR("%s: lov tgt %d not cleaned! "
 874                                        "deathrow=%d, lovrc=%d\n",
 875                                        obd->obd_name, i, lov->lov_death_row,
 876                                        atomic_read(&lov->lov_refcount));
 877                         lov_del_target(obd, i, NULL, 0);
 878                 }
 879                 obd_putref(obd);
 880                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 881                          lov->lov_tgt_size);
 882                 lov->lov_tgt_size = 0;
 883         }
 884
 885         if (lov->lov_cache != NULL) {
 886                 cl_cache_decref(lov->lov_cache);
 887                 lov->lov_cache = NULL;
 888         }
 889
 890         RETURN(0);
 891 }
 892
 893 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 894                             __u32 *indexp, int *genp)
 895 {
 896         struct obd_uuid obd_uuid;
 897         int cmd;
 898         int rc = 0;
 899         ENTRY;
 900
 901         switch(cmd = lcfg->lcfg_command) {
 902         case LCFG_ADD_MDC:
 903         case LCFG_DEL_MDC:
 904                 break;
 905         case LCFG_LOV_ADD_OBD:
 906         case LCFG_LOV_ADD_INA:
 907         case LCFG_LOV_DEL_OBD: {
 908                 __u32 index;
 909                 int gen;
 910                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 911                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
 912                         GOTO(out, rc = -EINVAL);
 913
 914                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 915
 916                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", indexp) != 1)
 917                         GOTO(out, rc = -EINVAL);
 918                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1)
 919                         GOTO(out, rc = -EINVAL);
 920                 index = *indexp;
 921                 gen = *genp;
 922                 if (cmd == LCFG_LOV_ADD_OBD)
 923                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 924                 else if (cmd == LCFG_LOV_ADD_INA)
 925                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 926                 else
 927                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 928                 GOTO(out, rc);
 929         }
 930         case LCFG_PARAM: {
 931                 struct lov_desc *desc = &(obd->u.lov.desc);
 932
 933                 if (!desc)
 934                         GOTO(out, rc = -EINVAL);
 935
 936                 rc = class_process_proc_param(PARAM_LOV, obd->obd_vars,
 937                                               lcfg, obd);
 938                 if (rc > 0)
 939                         rc = 0;
 940                 GOTO(out, rc);
 941         }
 942         case LCFG_POOL_NEW:
 943         case LCFG_POOL_ADD:
 944         case LCFG_POOL_DEL:
 945         case LCFG_POOL_REM:
 946                 GOTO(out, rc);
 947
 948         default: {
 949                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 950                 GOTO(out, rc = -EINVAL);
 951
 952         }
 953         }
 954 out:
 955         RETURN(rc);
 956 }
 957
 958 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
 959                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
 960 {
 961         struct obd_device *obd = class_exp2obd(exp);
 962         struct lov_obd *lov = &obd->u.lov;
 963         struct obd_info oinfo = {
 964                 .oi_osfs = osfs,
 965                 .oi_flags = flags,
 966         };
 967         struct ptlrpc_request_set *rqset;
 968         struct lov_request_set *set = NULL;
 969         struct lov_request *req;
 970         int rc = 0;
 971         int rc2;
 972
 973         ENTRY;
 974
 975         rqset = ptlrpc_prep_set();
 976         if (rqset == NULL)
 977                 RETURN(-ENOMEM);
 978
 979         rc = lov_prep_statfs_set(obd, &oinfo, &set);
 980         if (rc < 0)
 981                 GOTO(out_rqset, rc);
 982
 983         list_for_each_entry(req, &set->set_list, rq_link) {
 984                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
 985                                       &req->rq_oi, max_age, rqset);
 986                 if (rc < 0)
 987                         GOTO(out_set, rc);
 988         }
 989
 990         rc = ptlrpc_set_wait(rqset);
 991
 992 out_set:
 993         if (rc < 0)
 994                 atomic_set(&set->set_completes, 0);
 995
 996         rc2 = lov_fini_statfs_set(set);
 997         if (rc == 0)
 998                 rc = rc2;
 999
1000 out_rqset:
1001         ptlrpc_set_destroy(rqset);
1002
1003         RETURN(rc);
1004 }
1005
1006 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1007                          void *karg, void __user *uarg)
1008 {
1009         struct obd_device *obddev = class_exp2obd(exp);
1010         struct lov_obd *lov = &obddev->u.lov;
1011         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1012         struct obd_uuid *uuidp;
1013         ENTRY;
1014
1015         switch (cmd) {
1016         case IOC_OBD_STATFS: {
1017                 struct obd_ioctl_data *data = karg;
1018                 struct obd_device *osc_obd;
1019                 struct obd_statfs stat_buf = {0};
1020                 __u32 index;
1021                 __u32 flags;
1022
1023                 memcpy(&index, data->ioc_inlbuf2, sizeof(index));
1024                 if ((index >= count))
1025                         RETURN(-ENODEV);
1026
1027                 if (!lov->lov_tgts[index])
1028                         /* Try again with the next index */
1029                         RETURN(-EAGAIN);
1030                 if (!lov->lov_tgts[index]->ltd_active)
1031                         RETURN(-ENODATA);
1032
1033                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1034                 if (!osc_obd)
1035                         RETURN(-EINVAL);
1036
1037                 /* copy UUID */
1038                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1039                                  min_t(unsigned long, data->ioc_plen2,
1040                                        sizeof(struct obd_uuid))))
1041                         RETURN(-EFAULT);
1042
1043                 memcpy(&flags, data->ioc_inlbuf1, sizeof(flags));
1044                 flags = flags & LL_STATFS_NODELAY ? OBD_STATFS_NODELAY : 0;
1045
1046                 /* got statfs data */
1047                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1048                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1049                                 flags);
1050                 if (rc)
1051                         RETURN(rc);
1052                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1053                                  min_t(unsigned long, data->ioc_plen1,
1054                                        sizeof(struct obd_statfs))))
1055                         RETURN(-EFAULT);
1056                 break;
1057         }
1058         case OBD_IOC_LOV_GET_CONFIG: {
1059                 struct obd_ioctl_data *data;
1060                 struct lov_desc *desc;
1061                 char *buf = NULL;
1062                 __u32 *genp;
1063
1064                 len = 0;
1065                 if (obd_ioctl_getdata(&buf, &len, uarg))
1066                         RETURN(-EINVAL);
1067
1068                 data = (struct obd_ioctl_data *)buf;
1069
1070                 if (sizeof(*desc) > data->ioc_inllen1) {
1071                         OBD_FREE_LARGE(buf, len);
1072                         RETURN(-EINVAL);
1073                 }
1074
1075                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1076                         OBD_FREE_LARGE(buf, len);
1077                         RETURN(-EINVAL);
1078                 }
1079
1080                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1081                         OBD_FREE_LARGE(buf, len);
1082                         RETURN(-EINVAL);
1083                 }
1084
1085                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1086                 memcpy(desc, &(lov->desc), sizeof(*desc));
1087
1088                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1089                 genp = (__u32 *)data->ioc_inlbuf3;
1090                 /* the uuid will be empty for deleted OSTs */
1091                 for (i = 0; i < count; i++, uuidp++, genp++) {
1092                         if (!lov->lov_tgts[i])
1093                                 continue;
1094                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1095                         *genp = lov->lov_tgts[i]->ltd_gen;
1096                 }
1097
1098                 if (copy_to_user(uarg, buf, len))
1099                         rc = -EFAULT;
1100                 OBD_FREE_LARGE(buf, len);
1101                 break;
1102         }
1103         case OBD_IOC_QUOTACTL: {
1104                 struct if_quotactl *qctl = karg;
1105                 struct lov_tgt_desc *tgt = NULL;
1106                 struct obd_quotactl *oqctl;
1107
1108                 if (qctl->qc_valid == QC_OSTIDX) {
1109                         if (count <= qctl->qc_idx)
1110                                 RETURN(-EINVAL);
1111
1112                         tgt = lov->lov_tgts[qctl->qc_idx];
1113                         if (!tgt || !tgt->ltd_exp)
1114                                 RETURN(-EINVAL);
1115                 } else if (qctl->qc_valid == QC_UUID) {
1116                         for (i = 0; i < count; i++) {
1117                                 tgt = lov->lov_tgts[i];
1118                                 if (!tgt ||
1119                                     !obd_uuid_equals(&tgt->ltd_uuid,
1120                                                      &qctl->obd_uuid))
1121                                         continue;
1122
1123                                 if (tgt->ltd_exp == NULL)
1124                                         RETURN(-EINVAL);
1125
1126                                 break;
1127                         }
1128                 } else {
1129                         RETURN(-EINVAL);
1130                 }
1131
1132                 if (i >= count)
1133                         RETURN(-EAGAIN);
1134
1135                 LASSERT(tgt && tgt->ltd_exp);
1136                 OBD_ALLOC_PTR(oqctl);
1137                 if (!oqctl)
1138                         RETURN(-ENOMEM);
1139
1140                 QCTL_COPY(oqctl, qctl);
1141                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1142                 if (rc == 0) {
1143                         QCTL_COPY(qctl, oqctl);
1144                         qctl->qc_valid = QC_OSTIDX;
1145                         qctl->obd_uuid = tgt->ltd_uuid;
1146                 }
1147                 OBD_FREE_PTR(oqctl);
1148                 break;
1149         }
1150         default: {
1151                 int set = 0;
1152
1153                 if (count == 0)
1154                         RETURN(-ENOTTY);
1155
1156                 for (i = 0; i < count; i++) {
1157                         int err;
1158                         struct obd_device *osc_obd;
1159
1160                         /* OST was disconnected */
1161                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1162                                 continue;
1163
1164                         /* ll_umount_begin() sets force flag but for lov, not
1165                          * osc. Let's pass it through */
1166                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1167                         osc_obd->obd_force = obddev->obd_force;
1168                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1169                                             len, karg, uarg);
1170                         if (err) {
1171                                 if (lov->lov_tgts[i]->ltd_active) {
1172                                         CDEBUG(err == -ENOTTY ?
1173                                                D_IOCTL : D_WARNING,
1174                                                "iocontrol OSC %s on OST "
1175                                                "idx %d cmd %x: err = %d\n",
1176                                                lov_uuid2str(lov, i),
1177                                                i, cmd, err);
1178                                         if (!rc)
1179                                                 rc = err;
1180                                 }
1181                         } else {
1182                                 set = 1;
1183                         }
1184                 }
1185                 if (!set && !rc)
1186                         rc = -EIO;
1187         }
1188         }
1189
1190         RETURN(rc);
1191 }
1192
1193 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1194                         __u32 keylen, void *key, __u32 *vallen, void *val)
1195 {
1196         struct obd_device *obddev = class_exp2obd(exp);
1197         struct lov_obd *lov = &obddev->u.lov;
1198         struct lov_desc *ld = &lov->desc;
1199         int rc = 0;
1200         ENTRY;
1201
1202         if (vallen == NULL || val == NULL)
1203                 RETURN(-EFAULT);
1204
1205         obd_getref(obddev);
1206
1207         if (KEY_IS(KEY_MAX_EASIZE)) {
1208                 u32 max_stripe_count = min_t(u32, ld->ld_active_tgt_count,
1209                                              LOV_MAX_STRIPE_COUNT);
1210
1211                 *((u32 *)val) = lov_mds_md_size(max_stripe_count, LOV_MAGIC_V3);
1212         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
1213                 u32 def_stripe_count = min_t(u32, ld->ld_default_stripe_count,
1214                                              LOV_MAX_STRIPE_COUNT);
1215
1216                 *((u32 *)val) = lov_mds_md_size(def_stripe_count, LOV_MAGIC_V3);
1217         } else if (KEY_IS(KEY_TGT_COUNT)) {
1218                 *((int *)val) = lov->desc.ld_tgt_count;
1219         } else {
1220                 rc = -EINVAL;
1221         }
1222
1223         obd_putref(obddev);
1224
1225         RETURN(rc);
1226 }
1227
1228 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
1229                               __u32 keylen, void *key,
1230                               __u32 vallen, void *val,
1231                               struct ptlrpc_request_set *set)
1232 {
1233         struct obd_device *obddev = class_exp2obd(exp);
1234         struct lov_obd *lov = &obddev->u.lov;
1235         struct lov_tgt_desc *tgt;
1236         bool do_inactive = false, no_set = false;
1237         u32 i;
1238         int rc = 0;
1239         int err;
1240
1241         ENTRY;
1242
1243         if (set == NULL) {
1244                 no_set = true;
1245                 set = ptlrpc_prep_set();
1246                 if (!set)
1247                         RETURN(-ENOMEM);
1248         }
1249
1250         obd_getref(obddev);
1251
1252         if (KEY_IS(KEY_CHECKSUM)) {
1253                 do_inactive = true;
1254         } else if (KEY_IS(KEY_CACHE_SET)) {
1255                 LASSERT(lov->lov_cache == NULL);
1256                 lov->lov_cache = val;
1257                 do_inactive = true;
1258                 cl_cache_incref(lov->lov_cache);
1259         }
1260
1261         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1262                 tgt = lov->lov_tgts[i];
1263
1264                 /* OST was disconnected */
1265                 if (tgt == NULL || tgt->ltd_exp == NULL)
1266                         continue;
1267
1268                 /* OST is inactive and we don't want inactive OSCs */
1269                 if (!tgt->ltd_active && !do_inactive)
1270                         continue;
1271
1272                 err = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1273                                          vallen, val, set);
1274
1275                 if (rc == 0)
1276                         rc = err;
1277         }
1278
1279         /* cycle through MDC target for Data-on-MDT */
1280         for (i = 0; i < LOV_MDC_TGT_MAX; i++) {
1281                 struct obd_device *mdc;
1282
1283                 mdc = lov->lov_mdc_tgts[i].lmtd_mdc;
1284                 if (mdc == NULL)
1285                         continue;
1286
1287                 err = obd_set_info_async(env, mdc->obd_self_export,
1288                                          keylen, key, vallen, val, set);
1289                 if (rc == 0)
1290                         rc = err;
1291         }
1292
1293         obd_putref(obddev);
1294         if (no_set) {
1295                 err = ptlrpc_set_wait(set);
1296                 if (rc == 0)
1297                         rc = err;
1298                 ptlrpc_set_destroy(set);
1299         }
1300         RETURN(rc);
1301 }
1302
1303 void lov_stripe_lock(struct lov_stripe_md *md)
1304 __acquires(&md->lsm_lock)
1305 {
1306         LASSERT(md->lsm_lock_owner != current_pid());
1307         spin_lock(&md->lsm_lock);
1308         LASSERT(md->lsm_lock_owner == 0);
1309         md->lsm_lock_owner = current_pid();
1310 }
1311
1312 void lov_stripe_unlock(struct lov_stripe_md *md)
1313 __releases(&md->lsm_lock)
1314 {
1315         LASSERT(md->lsm_lock_owner == current_pid());
1316         md->lsm_lock_owner = 0;
1317         spin_unlock(&md->lsm_lock);
1318 }
1319
1320 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
1321                         struct obd_quotactl *oqctl)
1322 {
1323         struct lov_obd      *lov = &obd->u.lov;
1324         struct lov_tgt_desc *tgt;
1325         __u64                curspace = 0;
1326         __u64                bhardlimit = 0;
1327         int                  i, rc = 0;
1328         ENTRY;
1329
1330         if (oqctl->qc_cmd != Q_GETOQUOTA &&
1331             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA) {
1332                 CERROR("%s: bad quota opc %x for lov obd\n",
1333                        obd->obd_name, oqctl->qc_cmd);
1334                 RETURN(-EFAULT);
1335         }
1336
1337         /* for lov tgt */
1338         obd_getref(obd);
1339         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1340                 int err;
1341
1342                 tgt = lov->lov_tgts[i];
1343
1344                 if (!tgt)
1345                         continue;
1346
1347                 if (!tgt->ltd_active || tgt->ltd_reap) {
1348                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
1349                             lov->lov_tgts[i]->ltd_activate) {
1350                                 rc = -ENETDOWN;
1351                                 CERROR("ost %d is inactive\n", i);
1352                         } else {
1353                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
1354                         }
1355                         continue;
1356                 }
1357
1358                 err = obd_quotactl(tgt->ltd_exp, oqctl);
1359                 if (err) {
1360                         if (tgt->ltd_active && !rc)
1361                                 rc = err;
1362                         continue;
1363                 }
1364
1365                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
1366                         curspace += oqctl->qc_dqblk.dqb_curspace;
1367                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
1368                 }
1369         }
1370         obd_putref(obd);
1371
1372         if (oqctl->qc_cmd == Q_GETOQUOTA) {
1373                 oqctl->qc_dqblk.dqb_curspace = curspace;
1374                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
1375         }
1376         RETURN(rc);
1377 }
1378
1379 static struct obd_ops lov_obd_ops = {
1380         .o_owner                = THIS_MODULE,
1381         .o_setup                = lov_setup,
1382         .o_cleanup              = lov_cleanup,
1383         .o_connect              = lov_connect,
1384         .o_disconnect           = lov_disconnect,
1385         .o_statfs               = lov_statfs,
1386         .o_iocontrol            = lov_iocontrol,
1387         .o_get_info             = lov_get_info,
1388         .o_set_info_async       = lov_set_info_async,
1389         .o_notify               = lov_notify,
1390         .o_pool_new             = lov_pool_new,
1391         .o_pool_rem             = lov_pool_remove,
1392         .o_pool_add             = lov_pool_add,
1393         .o_pool_del             = lov_pool_del,
1394         .o_getref               = lov_getref,
1395         .o_putref               = lov_putref,
1396         .o_quotactl             = lov_quotactl,
1397 };
1398
1399 struct kmem_cache *lov_oinfo_slab;
1400
1401 static int __init lov_init(void)
1402 {
1403         bool enable_proc = true;
1404         struct obd_type *type;
1405         int rc;
1406         ENTRY;
1407
1408         /* print an address of _any_ initialized kernel symbol from this
1409          * module, to allow debugging with gdb that doesn't support data
1410          * symbols from modules.*/
1411         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
1412
1413         rc = lu_kmem_init(lov_caches);
1414         if (rc)
1415                 return rc;
1416
1417         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
1418                                            sizeof(struct lov_oinfo), 0,
1419                                            SLAB_HWCACHE_ALIGN, NULL);
1420         if (lov_oinfo_slab == NULL) {
1421                 lu_kmem_fini(lov_caches);
1422                 return -ENOMEM;
1423         }
1424
1425         type = class_search_type(LUSTRE_LOD_NAME);
1426         if (type != NULL && type->typ_procsym != NULL)
1427                 enable_proc = false;
1428
1429         rc = class_register_type(&lov_obd_ops, NULL, enable_proc, NULL,
1430                                  LUSTRE_LOV_NAME, &lov_device_type);
1431
1432         if (rc) {
1433                 kmem_cache_destroy(lov_oinfo_slab);
1434                 lu_kmem_fini(lov_caches);
1435         }
1436
1437         RETURN(rc);
1438 }
1439
1440 static void __exit lov_exit(void)
1441 {
1442         class_unregister_type(LUSTRE_LOV_NAME);
1443         kmem_cache_destroy(lov_oinfo_slab);
1444         lu_kmem_fini(lov_caches);
1445 }
1446
1447 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1448 MODULE_DESCRIPTION("Lustre Logical Object Volume");
1449 MODULE_VERSION(LUSTRE_VERSION_STRING);
1450 MODULE_LICENSE("GPL");
1451
1452 module_init(lov_init);
1453 module_exit(lov_exit);