drivers/staging/lustre/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, 2015, 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 "../../include/linux/libcfs/libcfs.h"
  42
  43 #include "../include/lustre/lustre_idl.h"
  44 #include "../include/lustre/lustre_ioctl.h"
  45
  46 #include "../include/cl_object.h"
  47 #include "../include/lustre_dlm.h"
  48 #include "../include/lustre_fid.h"
  49 #include "../include/lustre_lib.h"
  50 #include "../include/lustre_mds.h"
  51 #include "../include/lustre_net.h"
  52 #include "../include/lustre_param.h"
  53 #include "../include/lustre_swab.h"
  54 #include "../include/lprocfs_status.h"
  55 #include "../include/obd_class.h"
  56 #include "../include/obd_support.h"
  57
  58 #include "lov_internal.h"
  59
  60 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  61  * Any function that expects lov_tgts to remain stationary must take a ref.
  62  */
  63 static void lov_getref(struct obd_device *obd)
  64 {
  65         struct lov_obd *lov = &obd->u.lov;
  66
  67         /* nobody gets through here until lov_putref is done */
  68         mutex_lock(&lov->lov_lock);
  69         atomic_inc(&lov->lov_refcount);
  70         mutex_unlock(&lov->lov_lock);
  71         return;
  72 }
  73
  74 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  75
  76 static void lov_putref(struct obd_device *obd)
  77 {
  78         struct lov_obd *lov = &obd->u.lov;
  79
  80         mutex_lock(&lov->lov_lock);
  81         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  82         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  83                 LIST_HEAD(kill);
  84                 int i;
  85                 struct lov_tgt_desc *tgt, *n;
  86
  87                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  88                        lov->lov_death_row);
  89                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  90                         tgt = lov->lov_tgts[i];
  91
  92                         if (!tgt || !tgt->ltd_reap)
  93                                 continue;
  94                         list_add(&tgt->ltd_kill, &kill);
  95                         /* XXX - right now there is a dependency on ld_tgt_count
  96                          * being the maximum tgt index for computing the
  97                          * mds_max_easize. So we can't shrink it.
  98                          */
  99                         lov_ost_pool_remove(&lov->lov_packed, i);
 100                         lov->lov_tgts[i] = NULL;
 101                         lov->lov_death_row--;
 102                 }
 103                 mutex_unlock(&lov->lov_lock);
 104
 105                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 106                         list_del(&tgt->ltd_kill);
 107                         /* Disconnect */
 108                         __lov_del_obd(obd, tgt);
 109                 }
 110
 111                 if (lov->lov_tgts_kobj)
 112                         kobject_put(lov->lov_tgts_kobj);
 113
 114         } else {
 115                 mutex_unlock(&lov->lov_lock);
 116         }
 117 }
 118
 119 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 120                               enum obd_notify_event ev);
 121 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 122                       enum obd_notify_event ev, void *data);
 123
 124 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 125                     struct obd_connect_data *data)
 126 {
 127         struct lov_obd *lov = &obd->u.lov;
 128         struct obd_uuid *tgt_uuid;
 129         struct obd_device *tgt_obd;
 130         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 131         struct obd_import *imp;
 132         int rc;
 133
 134         if (!lov->lov_tgts[index])
 135                 return -EINVAL;
 136
 137         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 138         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 139
 140         if (!tgt_obd->obd_set_up) {
 141                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 142                 return -EINVAL;
 143         }
 144
 145         /* override the sp_me from lov */
 146         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 147
 148         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 149                 data->ocd_index = index;
 150
 151         /*
 152          * Divine LOV knows that OBDs under it are OSCs.
 153          */
 154         imp = tgt_obd->u.cli.cl_import;
 155
 156         if (activate) {
 157                 tgt_obd->obd_no_recov = 0;
 158                 /* FIXME this is probably supposed to be
 159                  * ptlrpc_set_import_active.  Horrible naming.
 160                  */
 161                 ptlrpc_activate_import(imp);
 162         }
 163
 164         rc = obd_register_observer(tgt_obd, obd);
 165         if (rc) {
 166                 CERROR("Target %s register_observer error %d\n",
 167                        obd_uuid2str(tgt_uuid), rc);
 168                 return rc;
 169         }
 170
 171         if (imp->imp_invalid) {
 172                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively disabled\n",
 173                        obd_uuid2str(tgt_uuid));
 174                 return 0;
 175         }
 176
 177         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 178                          &lov_osc_uuid, data, NULL);
 179         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 180                 CERROR("Target %s connect error %d\n",
 181                        obd_uuid2str(tgt_uuid), rc);
 182                 return -ENODEV;
 183         }
 184
 185         lov->lov_tgts[index]->ltd_reap = 0;
 186
 187         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 188                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 189
 190         if (lov->lov_tgts_kobj)
 191                 /* Even if we failed, that's ok */
 192                 rc = sysfs_create_link(lov->lov_tgts_kobj, &tgt_obd->obd_kobj,
 193                                        tgt_obd->obd_name);
 194
 195         return 0;
 196 }
 197
 198 static int lov_connect(const struct lu_env *env,
 199                        struct obd_export **exp, struct obd_device *obd,
 200                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 201                        void *localdata)
 202 {
 203         struct lov_obd *lov = &obd->u.lov;
 204         struct lov_tgt_desc *tgt;
 205         struct lustre_handle conn;
 206         int i, rc;
 207
 208         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 209
 210         rc = class_connect(&conn, obd, cluuid);
 211         if (rc)
 212                 return rc;
 213
 214         *exp = class_conn2export(&conn);
 215
 216         /* Why should there ever be more than 1 connect? */
 217         lov->lov_connects++;
 218         LASSERT(lov->lov_connects == 1);
 219
 220         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 221         if (data)
 222                 lov->lov_ocd = *data;
 223
 224         obd_getref(obd);
 225
 226         lov->lov_tgts_kobj = kobject_create_and_add("target_obds",
 227                                                     &obd->obd_kobj);
 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_obd(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, (void *)&i);
 246                 if (rc) {
 247                         CERROR("%s error sending notify %d\n",
 248                                obd->obd_name, rc);
 249                 }
 250         }
 251         obd_putref(obd);
 252
 253         return 0;
 254 }
 255
 256 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 257 {
 258         struct lov_obd *lov = &obd->u.lov;
 259         struct obd_device *osc_obd;
 260         int rc;
 261
 262         osc_obd = class_exp2obd(tgt->ltd_exp);
 263         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 264                obd->obd_name, osc_obd ? osc_obd->obd_name : "NULL");
 265
 266         if (tgt->ltd_active) {
 267                 tgt->ltd_active = 0;
 268                 lov->desc.ld_active_tgt_count--;
 269                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 270         }
 271
 272         if (osc_obd) {
 273                 if (lov->lov_tgts_kobj)
 274                         sysfs_remove_link(lov->lov_tgts_kobj,
 275                                           osc_obd->obd_name);
 276
 277                 /* Pass it on to our clients.
 278                  * XXX This should be an argument to disconnect,
 279                  * XXX not a back-door flag on the OBD.  Ah well.
 280                  */
 281                 osc_obd->obd_force = obd->obd_force;
 282                 osc_obd->obd_fail = obd->obd_fail;
 283                 osc_obd->obd_no_recov = obd->obd_no_recov;
 284         }
 285
 286         obd_register_observer(osc_obd, NULL);
 287
 288         rc = obd_disconnect(tgt->ltd_exp);
 289         if (rc) {
 290                 CERROR("Target %s disconnect error %d\n",
 291                        tgt->ltd_uuid.uuid, rc);
 292                 rc = 0;
 293         }
 294
 295         tgt->ltd_exp = NULL;
 296         return 0;
 297 }
 298
 299 static int lov_disconnect(struct obd_export *exp)
 300 {
 301         struct obd_device *obd = class_exp2obd(exp);
 302         struct lov_obd *lov = &obd->u.lov;
 303         int i, rc;
 304
 305         if (!lov->lov_tgts)
 306                 goto out;
 307
 308         /* Only disconnect the underlying layers on the final disconnect. */
 309         lov->lov_connects--;
 310         if (lov->lov_connects != 0) {
 311                 /* why should there be more than 1 connect? */
 312                 CERROR("disconnect #%d\n", lov->lov_connects);
 313                 goto out;
 314         }
 315
 316         /* Let's hold another reference so lov_del_obd doesn't spin through
 317          * putref every time
 318          */
 319         obd_getref(obd);
 320
 321         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 322                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 323                         /* Disconnection is the last we know about an obd */
 324                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
 325                 }
 326         }
 327
 328         obd_putref(obd);
 329
 330 out:
 331         rc = class_disconnect(exp); /* bz 9811 */
 332         return rc;
 333 }
 334
 335 /* Error codes:
 336  *
 337  *  -EINVAL  : UUID can't be found in the LOV's target list
 338  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 339  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 340  *  any >= 0 : is log target index
 341  */
 342 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 343                               enum obd_notify_event ev)
 344 {
 345         struct lov_obd *lov = &obd->u.lov;
 346         struct lov_tgt_desc *tgt;
 347         int index, activate, active;
 348
 349         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 350                lov, uuid->uuid, ev);
 351
 352         obd_getref(obd);
 353         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 354                 tgt = lov->lov_tgts[index];
 355                 if (!tgt)
 356                         continue;
 357                 /*
 358                  * LU-642, initially inactive OSC could miss the obd_connect,
 359                  * we make up for it here.
 360                  */
 361                 if (ev == OBD_NOTIFY_ACTIVATE && !tgt->ltd_exp &&
 362                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 363                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 364
 365                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 366                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 367                 }
 368                 if (!tgt->ltd_exp)
 369                         continue;
 370
 371                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 372                        index, obd_uuid2str(&tgt->ltd_uuid),
 373                        tgt->ltd_exp->exp_handle.h_cookie);
 374                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 375                         break;
 376         }
 377
 378         if (index == lov->desc.ld_tgt_count) {
 379                 index = -EINVAL;
 380                 goto out;
 381         }
 382
 383         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 384                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 385
 386                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 387                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 388                                uuid->uuid, activate ? "" : "de");
 389                 } else {
 390                         lov->lov_tgts[index]->ltd_activate = activate;
 391                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 392                                activate ? "" : "de", obd_uuid2str(uuid));
 393                 }
 394
 395         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 396                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 397
 398                 if (lov->lov_tgts[index]->ltd_active == active) {
 399                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 400                                uuid->uuid, active ? "" : "in");
 401                         goto out;
 402                 }
 403                 CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 404                        obd_uuid2str(uuid), active ? "" : "in");
 405
 406                 lov->lov_tgts[index]->ltd_active = active;
 407                 if (active) {
 408                         lov->desc.ld_active_tgt_count++;
 409                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 410                 } else {
 411                         lov->desc.ld_active_tgt_count--;
 412                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 413                 }
 414         } else {
 415                 CERROR("Unknown event(%d) for uuid %s", ev, uuid->uuid);
 416         }
 417
 418  out:
 419         obd_putref(obd);
 420         return index;
 421 }
 422
 423 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 424                       enum obd_notify_event ev, void *data)
 425 {
 426         int rc = 0;
 427         struct lov_obd *lov = &obd->u.lov;
 428
 429         down_read(&lov->lov_notify_lock);
 430         if (!lov->lov_connects) {
 431                 up_read(&lov->lov_notify_lock);
 432                 return rc;
 433         }
 434
 435         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 436             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 437                 struct obd_uuid *uuid;
 438
 439                 LASSERT(watched);
 440
 441                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 442                         up_read(&lov->lov_notify_lock);
 443                         CERROR("unexpected notification of %s %s!\n",
 444                                watched->obd_type->typ_name,
 445                                watched->obd_name);
 446                         return -EINVAL;
 447                 }
 448                 uuid = &watched->u.cli.cl_target_uuid;
 449
 450                 /* Set OSC as active before notifying the observer, so the
 451                  * observer can use the OSC normally.
 452                  */
 453                 rc = lov_set_osc_active(obd, uuid, ev);
 454                 if (rc < 0) {
 455                         up_read(&lov->lov_notify_lock);
 456                         CERROR("event(%d) of %s failed: %d\n", ev,
 457                                obd_uuid2str(uuid), rc);
 458                         return rc;
 459                 }
 460                 /* active event should be pass lov target index as data */
 461                 data = &rc;
 462         }
 463
 464         /* Pass the notification up the chain. */
 465         if (watched) {
 466                 rc = obd_notify_observer(obd, watched, ev, data);
 467         } else {
 468                 /* NULL watched means all osc's in the lov (only for syncs) */
 469                 /* sync event should be send lov idx as data */
 470                 struct lov_obd *lov = &obd->u.lov;
 471                 int i, is_sync;
 472
 473                 data = &i;
 474                 is_sync = (ev == OBD_NOTIFY_SYNC) ||
 475                           (ev == OBD_NOTIFY_SYNC_NONBLOCK);
 476
 477                 obd_getref(obd);
 478                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 479                         if (!lov->lov_tgts[i])
 480                                 continue;
 481
 482                         /* don't send sync event if target not
 483                          * connected/activated
 484                          */
 485                         if (is_sync &&  !lov->lov_tgts[i]->ltd_active)
 486                                 continue;
 487
 488                         rc = obd_notify_observer(obd, lov->lov_tgts[i]->ltd_obd,
 489                                                  ev, data);
 490                         if (rc) {
 491                                 CERROR("%s: notify %s of %s failed %d\n",
 492                                        obd->obd_name,
 493                                        obd->obd_observer->obd_name,
 494                                        lov->lov_tgts[i]->ltd_obd->obd_name,
 495                                        rc);
 496                         }
 497                 }
 498                 obd_putref(obd);
 499         }
 500
 501         up_read(&lov->lov_notify_lock);
 502         return rc;
 503 }
 504
 505 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 506                           __u32 index, int gen, int active)
 507 {
 508         struct lov_obd *lov = &obd->u.lov;
 509         struct lov_tgt_desc *tgt;
 510         struct obd_device *tgt_obd;
 511         int rc;
 512
 513         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 514                uuidp->uuid, index, gen, active);
 515
 516         if (gen <= 0) {
 517                 CERROR("request to add OBD %s with invalid generation: %d\n",
 518                        uuidp->uuid, gen);
 519                 return -EINVAL;
 520         }
 521
 522         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 523                                         &obd->obd_uuid);
 524         if (!tgt_obd)
 525                 return -EINVAL;
 526
 527         mutex_lock(&lov->lov_lock);
 528
 529         if ((index < lov->lov_tgt_size) && lov->lov_tgts[index]) {
 530                 tgt = lov->lov_tgts[index];
 531                 CERROR("UUID %s already assigned at LOV target index %d\n",
 532                        obd_uuid2str(&tgt->ltd_uuid), index);
 533                 mutex_unlock(&lov->lov_lock);
 534                 return -EEXIST;
 535         }
 536
 537         if (index >= lov->lov_tgt_size) {
 538                 /* We need to reallocate the lov target array. */
 539                 struct lov_tgt_desc **newtgts, **old = NULL;
 540                 __u32 newsize, oldsize = 0;
 541
 542                 newsize = max_t(__u32, lov->lov_tgt_size, 2);
 543                 while (newsize < index + 1)
 544                         newsize <<= 1;
 545                 newtgts = kcalloc(newsize, sizeof(*newtgts), GFP_NOFS);
 546                 if (!newtgts) {
 547                         mutex_unlock(&lov->lov_lock);
 548                         return -ENOMEM;
 549                 }
 550
 551                 if (lov->lov_tgt_size) {
 552                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 553                                lov->lov_tgt_size);
 554                         old = lov->lov_tgts;
 555                         oldsize = lov->lov_tgt_size;
 556                 }
 557
 558                 lov->lov_tgts = newtgts;
 559                 lov->lov_tgt_size = newsize;
 560                 smp_rmb();
 561                 kfree(old);
 562
 563                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 564                        lov->lov_tgts, lov->lov_tgt_size);
 565         }
 566
 567         tgt = kzalloc(sizeof(*tgt), GFP_NOFS);
 568         if (!tgt) {
 569                 mutex_unlock(&lov->lov_lock);
 570                 return -ENOMEM;
 571         }
 572
 573         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 574         if (rc) {
 575                 mutex_unlock(&lov->lov_lock);
 576                 kfree(tgt);
 577                 return rc;
 578         }
 579
 580         tgt->ltd_uuid = *uuidp;
 581         tgt->ltd_obd = tgt_obd;
 582         /* XXX - add a sanity check on the generation number. */
 583         tgt->ltd_gen = gen;
 584         tgt->ltd_index = index;
 585         tgt->ltd_activate = active;
 586         lov->lov_tgts[index] = tgt;
 587         if (index >= lov->desc.ld_tgt_count)
 588                 lov->desc.ld_tgt_count = index + 1;
 589
 590         mutex_unlock(&lov->lov_lock);
 591
 592         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 593                index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 594
 595         rc = obd_notify(obd, tgt_obd, OBD_NOTIFY_CREATE, &index);
 596
 597         if (lov->lov_connects == 0) {
 598                 /* lov_connect hasn't been called yet. We'll do the
 599                  * lov_connect_obd on this target when that fn first runs,
 600                  * because we don't know the connect flags yet.
 601                  */
 602                 return 0;
 603         }
 604
 605         obd_getref(obd);
 606
 607         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 608         if (rc)
 609                 goto out;
 610
 611         /* connect to administrative disabled ost */
 612         if (!tgt->ltd_exp) {
 613                 rc = 0;
 614                 goto out;
 615         }
 616
 617         if (lov->lov_cache) {
 618                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 619                                         sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 620                                         sizeof(struct cl_client_cache),
 621                                         lov->lov_cache, NULL);
 622                 if (rc < 0)
 623                         goto out;
 624         }
 625
 626         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 627                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 628                         (void *)&index);
 629
 630 out:
 631         if (rc) {
 632                 CERROR("add failed (%d), deleting %s\n", rc,
 633                        obd_uuid2str(&tgt->ltd_uuid));
 634                 lov_del_target(obd, index, NULL, 0);
 635         }
 636         obd_putref(obd);
 637         return rc;
 638 }
 639
 640 /* Schedule a target for deletion */
 641 int lov_del_target(struct obd_device *obd, __u32 index,
 642                    struct obd_uuid *uuidp, int gen)
 643 {
 644         struct lov_obd *lov = &obd->u.lov;
 645         int count = lov->desc.ld_tgt_count;
 646         int rc = 0;
 647
 648         if (index >= count) {
 649                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 650                        index, count);
 651                 return -EINVAL;
 652         }
 653
 654         /* to make sure there's no ongoing lov_notify() now */
 655         down_write(&lov->lov_notify_lock);
 656         obd_getref(obd);
 657
 658         if (!lov->lov_tgts[index]) {
 659                 CERROR("LOV target at index %d is not setup.\n", index);
 660                 rc = -EINVAL;
 661                 goto out;
 662         }
 663
 664         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 665                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 666                        lov_uuid2str(lov, index), index,
 667                        obd_uuid2str(uuidp));
 668                 rc = -EINVAL;
 669                 goto out;
 670         }
 671
 672         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 673                lov_uuid2str(lov, index), index,
 674                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 675                lov->lov_tgts[index]->ltd_active);
 676
 677         lov->lov_tgts[index]->ltd_reap = 1;
 678         lov->lov_death_row++;
 679         /* we really delete it from obd_putref */
 680 out:
 681         obd_putref(obd);
 682         up_write(&lov->lov_notify_lock);
 683
 684         return rc;
 685 }
 686
 687 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 688 {
 689         struct obd_device *osc_obd;
 690
 691         LASSERT(tgt);
 692         LASSERT(tgt->ltd_reap);
 693
 694         osc_obd = class_exp2obd(tgt->ltd_exp);
 695
 696         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 697                tgt->ltd_uuid.uuid,
 698                osc_obd ? osc_obd->obd_name : "<no obd>");
 699
 700         if (tgt->ltd_exp)
 701                 lov_disconnect_obd(obd, tgt);
 702
 703         kfree(tgt);
 704
 705         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 706          * do it ourselves. And we can't do it from lov_cleanup,
 707          * because we just lost our only reference to it.
 708          */
 709         if (osc_obd)
 710                 class_manual_cleanup(osc_obd);
 711 }
 712
 713 void lov_fix_desc_stripe_size(__u64 *val)
 714 {
 715         if (*val < LOV_MIN_STRIPE_SIZE) {
 716                 if (*val != 0)
 717                         LCONSOLE_INFO("Increasing default stripe size to minimum %u\n",
 718                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 719                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 720         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 721                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 722                 LCONSOLE_WARN("Changing default stripe size to %llu (a multiple of %u)\n",
 723                               *val, LOV_MIN_STRIPE_SIZE);
 724         }
 725 }
 726
 727 void lov_fix_desc_stripe_count(__u32 *val)
 728 {
 729         if (*val == 0)
 730                 *val = 1;
 731 }
 732
 733 void lov_fix_desc_pattern(__u32 *val)
 734 {
 735         /* from lov_setstripe */
 736         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 737                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 738                 *val = 0;
 739         }
 740 }
 741
 742 void lov_fix_desc_qos_maxage(__u32 *val)
 743 {
 744         if (*val == 0)
 745                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 746 }
 747
 748 void lov_fix_desc(struct lov_desc *desc)
 749 {
 750         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 751         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 752         lov_fix_desc_pattern(&desc->ld_pattern);
 753         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 754 }
 755
 756 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 757 {
 758         struct lprocfs_static_vars lvars = { NULL };
 759         struct lov_desc *desc;
 760         struct lov_obd *lov = &obd->u.lov;
 761         int rc;
 762
 763         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 764                 CERROR("LOV setup requires a descriptor\n");
 765                 return -EINVAL;
 766         }
 767
 768         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 769
 770         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 771                 CERROR("descriptor size wrong: %d > %d\n",
 772                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 773                 return -EINVAL;
 774         }
 775
 776         if (desc->ld_magic != LOV_DESC_MAGIC) {
 777                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 778                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 779                                obd->obd_name, desc);
 780                         lustre_swab_lov_desc(desc);
 781                 } else {
 782                         CERROR("%s: Bad lov desc magic: %#x\n",
 783                                obd->obd_name, desc->ld_magic);
 784                         return -EINVAL;
 785                 }
 786         }
 787
 788         lov_fix_desc(desc);
 789
 790         desc->ld_active_tgt_count = 0;
 791         lov->desc = *desc;
 792         lov->lov_tgt_size = 0;
 793
 794         mutex_init(&lov->lov_lock);
 795         atomic_set(&lov->lov_refcount, 0);
 796         lov->lov_sp_me = LUSTRE_SP_CLI;
 797
 798         init_rwsem(&lov->lov_notify_lock);
 799
 800         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 801                                                    HASH_POOLS_MAX_BITS,
 802                                                    HASH_POOLS_BKT_BITS, 0,
 803                                                    CFS_HASH_MIN_THETA,
 804                                                    CFS_HASH_MAX_THETA,
 805                                                    &pool_hash_operations,
 806                                                    CFS_HASH_DEFAULT);
 807         INIT_LIST_HEAD(&lov->lov_pool_list);
 808         lov->lov_pool_count = 0;
 809         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 810         if (rc)
 811                 goto out;
 812
 813         lprocfs_lov_init_vars(&lvars);
 814         lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 815
 816         rc = ldebugfs_seq_create(obd->obd_debugfs_entry, "target_obd",
 817                                  0444, &lov_proc_target_fops, obd);
 818         if (rc)
 819                 CWARN("Error adding the target_obd file\n");
 820
 821         lov->lov_pool_debugfs_entry = ldebugfs_register("pools",
 822                                                      obd->obd_debugfs_entry,
 823                                                      NULL, NULL);
 824         return 0;
 825
 826 out:
 827         return rc;
 828 }
 829
 830 static int lov_cleanup(struct obd_device *obd)
 831 {
 832         struct lov_obd *lov = &obd->u.lov;
 833         struct list_head *pos, *tmp;
 834         struct pool_desc *pool;
 835
 836         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 837                 pool = list_entry(pos, struct pool_desc, pool_list);
 838                 /* free pool structs */
 839                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 840                 /* In the function below, .hs_keycmp resolves to
 841                  * pool_hashkey_keycmp()
 842                  */
 843                 /* coverity[overrun-buffer-val] */
 844                 lov_pool_del(obd, pool->pool_name);
 845         }
 846         cfs_hash_putref(lov->lov_pools_hash_body);
 847         lov_ost_pool_free(&lov->lov_packed);
 848
 849         lprocfs_obd_cleanup(obd);
 850         if (lov->lov_tgts) {
 851                 int i;
 852
 853                 obd_getref(obd);
 854                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 855                         if (!lov->lov_tgts[i])
 856                                 continue;
 857
 858                         /* Inactive targets may never have connected */
 859                         if (lov->lov_tgts[i]->ltd_active ||
 860                             atomic_read(&lov->lov_refcount))
 861                             /* We should never get here - these
 862                              * should have been removed in the
 863                              * disconnect.
 864                              */
 865                                 CERROR("lov tgt %d not cleaned! deathrow=%d, lovrc=%d\n",
 866                                        i, lov->lov_death_row,
 867                                        atomic_read(&lov->lov_refcount));
 868                         lov_del_target(obd, i, NULL, 0);
 869                 }
 870                 obd_putref(obd);
 871                 kfree(lov->lov_tgts);
 872                 lov->lov_tgt_size = 0;
 873         }
 874
 875         if (lov->lov_cache) {
 876                 cl_cache_decref(lov->lov_cache);
 877                 lov->lov_cache = NULL;
 878         }
 879
 880         return 0;
 881 }
 882
 883 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 884                             __u32 *indexp, int *genp)
 885 {
 886         struct obd_uuid obd_uuid;
 887         int cmd;
 888         int rc = 0;
 889
 890         switch (cmd = lcfg->lcfg_command) {
 891         case LCFG_LOV_ADD_OBD:
 892         case LCFG_LOV_ADD_INA:
 893         case LCFG_LOV_DEL_OBD: {
 894                 __u32 index;
 895                 int gen;
 896                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 897                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid)) {
 898                         rc = -EINVAL;
 899                         goto out;
 900                 }
 901
 902                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 903
 904                 rc = kstrtoint(lustre_cfg_buf(lcfg, 2), 10, indexp);
 905                 if (rc < 0)
 906                         goto out;
 907                 rc = kstrtoint(lustre_cfg_buf(lcfg, 3), 10, genp);
 908                 if (rc < 0)
 909                         goto out;
 910                 index = *indexp;
 911                 gen = *genp;
 912                 if (cmd == LCFG_LOV_ADD_OBD)
 913                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 914                 else if (cmd == LCFG_LOV_ADD_INA)
 915                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 916                 else
 917                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 918                 goto out;
 919         }
 920         case LCFG_PARAM: {
 921                 struct lprocfs_static_vars lvars = { NULL };
 922                 struct lov_desc *desc = &obd->u.lov.desc;
 923
 924                 if (!desc) {
 925                         rc = -EINVAL;
 926                         goto out;
 927                 }
 928
 929                 lprocfs_lov_init_vars(&lvars);
 930
 931                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 932                                               lcfg, obd);
 933                 if (rc > 0)
 934                         rc = 0;
 935                 goto out;
 936         }
 937         case LCFG_POOL_NEW:
 938         case LCFG_POOL_ADD:
 939         case LCFG_POOL_DEL:
 940         case LCFG_POOL_REM:
 941                 goto out;
 942
 943         default: {
 944                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 945                 rc = -EINVAL;
 946                 goto out;
 947         }
 948         }
 949 out:
 950         return rc;
 951 }
 952
 953 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
 954 {
 955         struct lov_request_set *lovset = (struct lov_request_set *)data;
 956         int err;
 957
 958         if (rc)
 959                 atomic_set(&lovset->set_completes, 0);
 960
 961         err = lov_fini_statfs_set(lovset);
 962         return rc ? rc : err;
 963 }
 964
 965 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
 966                             __u64 max_age, struct ptlrpc_request_set *rqset)
 967 {
 968         struct obd_device      *obd = class_exp2obd(exp);
 969         struct lov_request_set *set;
 970         struct lov_request *req;
 971         struct lov_obd *lov;
 972         int rc = 0;
 973
 974         LASSERT(oinfo->oi_osfs);
 975
 976         lov = &obd->u.lov;
 977         rc = lov_prep_statfs_set(obd, oinfo, &set);
 978         if (rc)
 979                 return rc;
 980
 981         list_for_each_entry(req, &set->set_list, rq_link) {
 982                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
 983                                       &req->rq_oi, max_age, rqset);
 984                 if (rc)
 985                         break;
 986         }
 987
 988         if (rc || list_empty(&rqset->set_requests)) {
 989                 int err;
 990
 991                 if (rc)
 992                         atomic_set(&set->set_completes, 0);
 993                 err = lov_fini_statfs_set(set);
 994                 return rc ? rc : err;
 995         }
 996
 997         LASSERT(!rqset->set_interpret);
 998         rqset->set_interpret = lov_statfs_interpret;
 999         rqset->set_arg = (void *)set;
1000         return 0;
1001 }
1002
1003 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1004                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1005 {
1006         struct ptlrpc_request_set *set = NULL;
1007         struct obd_info oinfo = {
1008                 .oi_osfs = osfs,
1009                 .oi_flags = flags,
1010         };
1011         int rc = 0;
1012
1013         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1014          * statfs requests
1015          */
1016         set = ptlrpc_prep_set();
1017         if (!set)
1018                 return -ENOMEM;
1019
1020         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1021         if (rc == 0)
1022                 rc = ptlrpc_set_wait(set);
1023         ptlrpc_set_destroy(set);
1024
1025         return rc;
1026 }
1027
1028 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1029                          void *karg, void __user *uarg)
1030 {
1031         struct obd_device *obddev = class_exp2obd(exp);
1032         struct lov_obd *lov = &obddev->u.lov;
1033         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1034         struct obd_uuid *uuidp;
1035
1036         switch (cmd) {
1037         case IOC_OBD_STATFS: {
1038                 struct obd_ioctl_data *data = karg;
1039                 struct obd_device *osc_obd;
1040                 struct obd_statfs stat_buf = {0};
1041                 __u32 index;
1042                 __u32 flags;
1043
1044                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1045                 if (index >= count)
1046                         return -ENODEV;
1047
1048                 if (!lov->lov_tgts[index])
1049                         /* Try again with the next index */
1050                         return -EAGAIN;
1051                 if (!lov->lov_tgts[index]->ltd_active)
1052                         return -ENODATA;
1053
1054                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1055                 if (!osc_obd)
1056                         return -EINVAL;
1057
1058                 /* copy UUID */
1059                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1060                                  min_t(unsigned long, data->ioc_plen2,
1061                                        sizeof(struct obd_uuid))))
1062                         return -EFAULT;
1063
1064                 memcpy(&flags, data->ioc_inlbuf1, sizeof(__u32));
1065                 flags = flags & LL_STATFS_NODELAY ? OBD_STATFS_NODELAY : 0;
1066
1067                 /* got statfs data */
1068                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1069                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1070                                 flags);
1071                 if (rc)
1072                         return rc;
1073                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1074                                  min_t(unsigned long, data->ioc_plen1,
1075                                        sizeof(stat_buf))))
1076                         return -EFAULT;
1077                 break;
1078         }
1079         case OBD_IOC_LOV_GET_CONFIG: {
1080                 struct obd_ioctl_data *data;
1081                 struct lov_desc *desc;
1082                 char *buf = NULL;
1083                 __u32 *genp;
1084
1085                 len = 0;
1086                 if (obd_ioctl_getdata(&buf, &len, uarg))
1087                         return -EINVAL;
1088
1089                 data = (struct obd_ioctl_data *)buf;
1090
1091                 if (sizeof(*desc) > data->ioc_inllen1) {
1092                         obd_ioctl_freedata(buf, len);
1093                         return -EINVAL;
1094                 }
1095
1096                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1097                         obd_ioctl_freedata(buf, len);
1098                         return -EINVAL;
1099                 }
1100
1101                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1102                         obd_ioctl_freedata(buf, len);
1103                         return -EINVAL;
1104                 }
1105
1106                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1107                 memcpy(desc, &lov->desc, sizeof(*desc));
1108
1109                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1110                 genp = (__u32 *)data->ioc_inlbuf3;
1111                 /* the uuid will be empty for deleted OSTs */
1112                 for (i = 0; i < count; i++, uuidp++, genp++) {
1113                         if (!lov->lov_tgts[i])
1114                                 continue;
1115                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1116                         *genp = lov->lov_tgts[i]->ltd_gen;
1117                 }
1118
1119                 if (copy_to_user(uarg, buf, len))
1120                         rc = -EFAULT;
1121                 obd_ioctl_freedata(buf, len);
1122                 break;
1123         }
1124         case OBD_IOC_QUOTACTL: {
1125                 struct if_quotactl *qctl = karg;
1126                 struct lov_tgt_desc *tgt = NULL;
1127                 struct obd_quotactl *oqctl;
1128
1129                 if (qctl->qc_valid == QC_OSTIDX) {
1130                         if (count <= qctl->qc_idx)
1131                                 return -EINVAL;
1132
1133                         tgt = lov->lov_tgts[qctl->qc_idx];
1134                         if (!tgt || !tgt->ltd_exp)
1135                                 return -EINVAL;
1136                 } else if (qctl->qc_valid == QC_UUID) {
1137                         for (i = 0; i < count; i++) {
1138                                 tgt = lov->lov_tgts[i];
1139                                 if (!tgt ||
1140                                     !obd_uuid_equals(&tgt->ltd_uuid,
1141                                                      &qctl->obd_uuid))
1142                                         continue;
1143
1144                                 if (!tgt->ltd_exp)
1145                                         return -EINVAL;
1146
1147                                 break;
1148                         }
1149                 } else {
1150                         return -EINVAL;
1151                 }
1152
1153                 if (i >= count)
1154                         return -EAGAIN;
1155
1156                 LASSERT(tgt && tgt->ltd_exp);
1157                 oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
1158                 if (!oqctl)
1159                         return -ENOMEM;
1160
1161                 QCTL_COPY(oqctl, qctl);
1162                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1163                 if (rc == 0) {
1164                         QCTL_COPY(qctl, oqctl);
1165                         qctl->qc_valid = QC_OSTIDX;
1166                         qctl->obd_uuid = tgt->ltd_uuid;
1167                 }
1168                 kfree(oqctl);
1169                 break;
1170         }
1171         default: {
1172                 int set = 0;
1173
1174                 if (count == 0)
1175                         return -ENOTTY;
1176
1177                 for (i = 0; i < count; i++) {
1178                         int err;
1179                         struct obd_device *osc_obd;
1180
1181                         /* OST was disconnected */
1182                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1183                                 continue;
1184
1185                         /* ll_umount_begin() sets force flag but for lov, not
1186                          * osc. Let's pass it through
1187                          */
1188                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1189                         osc_obd->obd_force = obddev->obd_force;
1190                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1191                                             len, karg, uarg);
1192                         if (err) {
1193                                 if (lov->lov_tgts[i]->ltd_active) {
1194                                         CDEBUG(err == -ENOTTY ?
1195                                                D_IOCTL : D_WARNING,
1196                                                "iocontrol OSC %s on OST idx %d cmd %x: err = %d\n",
1197                                                lov_uuid2str(lov, i),
1198                                                i, cmd, err);
1199                                         if (!rc)
1200                                                 rc = err;
1201                                 }
1202                         } else {
1203                                 set = 1;
1204                         }
1205                 }
1206                 if (!set && !rc)
1207                         rc = -EIO;
1208         }
1209         }
1210
1211         return rc;
1212 }
1213
1214 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1215                         __u32 keylen, void *key, __u32 *vallen, void *val)
1216 {
1217         struct obd_device *obddev = class_exp2obd(exp);
1218         struct lov_obd *lov = &obddev->u.lov;
1219         struct lov_desc *ld = &lov->desc;
1220         int rc = 0;
1221
1222         if (!vallen || !val)
1223                 return -EFAULT;
1224
1225         obd_getref(obddev);
1226
1227         if (KEY_IS(KEY_MAX_EASIZE)) {
1228                 u32 max_stripe_count = min_t(u32, ld->ld_active_tgt_count,
1229                                              LOV_MAX_STRIPE_COUNT);
1230
1231                 *((u32 *)val) = lov_mds_md_size(max_stripe_count, LOV_MAGIC_V3);
1232         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
1233                 u32 def_stripe_count = min_t(u32, ld->ld_default_stripe_count,
1234                                              LOV_MAX_STRIPE_COUNT);
1235
1236                 *((u32 *)val) = lov_mds_md_size(def_stripe_count, LOV_MAGIC_V3);
1237         } else if (KEY_IS(KEY_TGT_COUNT)) {
1238                 *((int *)val) = lov->desc.ld_tgt_count;
1239         } else {
1240                 rc = -EINVAL;
1241         }
1242
1243         obd_putref(obddev);
1244         return rc;
1245 }
1246
1247 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
1248                               u32 keylen, void *key, u32 vallen,
1249                               void *val, struct ptlrpc_request_set *set)
1250 {
1251         struct obd_device *obddev = class_exp2obd(exp);
1252         struct lov_obd *lov = &obddev->u.lov;
1253         u32 count;
1254         int i, rc = 0, err;
1255         struct lov_tgt_desc *tgt;
1256         int do_inactive = 0, no_set = 0;
1257
1258         if (!set) {
1259                 no_set = 1;
1260                 set = ptlrpc_prep_set();
1261                 if (!set)
1262                         return -ENOMEM;
1263         }
1264
1265         obd_getref(obddev);
1266         count = lov->desc.ld_tgt_count;
1267
1268         if (KEY_IS(KEY_CHECKSUM)) {
1269                 do_inactive = 1;
1270         } else if (KEY_IS(KEY_CACHE_SET)) {
1271                 LASSERT(!lov->lov_cache);
1272                 lov->lov_cache = val;
1273                 do_inactive = 1;
1274                 cl_cache_incref(lov->lov_cache);
1275         }
1276
1277         for (i = 0; i < count; i++) {
1278                 tgt = lov->lov_tgts[i];
1279
1280                 /* OST was disconnected */
1281                 if (!tgt || !tgt->ltd_exp)
1282                         continue;
1283
1284                 /* OST is inactive and we don't want inactive OSCs */
1285                 if (!tgt->ltd_active && !do_inactive)
1286                         continue;
1287
1288                 err = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1289                                          vallen, val, set);
1290                 if (!rc)
1291                         rc = err;
1292         }
1293
1294         obd_putref(obddev);
1295         if (no_set) {
1296                 err = ptlrpc_set_wait(set);
1297                 if (!rc)
1298                         rc = err;
1299                 ptlrpc_set_destroy(set);
1300         }
1301         return rc;
1302 }
1303
1304 void lov_stripe_lock(struct lov_stripe_md *md)
1305                 __acquires(&md->lsm_lock)
1306 {
1307         LASSERT(md->lsm_lock_owner != current_pid());
1308         spin_lock(&md->lsm_lock);
1309         LASSERT(md->lsm_lock_owner == 0);
1310         md->lsm_lock_owner = current_pid();
1311 }
1312
1313 void lov_stripe_unlock(struct lov_stripe_md *md)
1314                 __releases(&md->lsm_lock)
1315 {
1316         LASSERT(md->lsm_lock_owner == current_pid());
1317         md->lsm_lock_owner = 0;
1318         spin_unlock(&md->lsm_lock);
1319 }
1320
1321 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
1322                         struct obd_quotactl *oqctl)
1323 {
1324         struct lov_obd      *lov = &obd->u.lov;
1325         struct lov_tgt_desc *tgt;
1326         __u64           curspace = 0;
1327         __u64           bhardlimit = 0;
1328         int               i, rc = 0;
1329
1330         if (oqctl->qc_cmd != Q_GETOQUOTA &&
1331             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA) {
1332                 CERROR("bad quota opc %x for lov obd\n", oqctl->qc_cmd);
1333                 return -EFAULT;
1334         }
1335
1336         /* for lov tgt */
1337         obd_getref(obd);
1338         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1339                 int err;
1340
1341                 tgt = lov->lov_tgts[i];
1342
1343                 if (!tgt)
1344                         continue;
1345
1346                 if (!tgt->ltd_active || tgt->ltd_reap) {
1347                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
1348                             lov->lov_tgts[i]->ltd_activate) {
1349                                 rc = -EREMOTEIO;
1350                                 CERROR("ost %d is inactive\n", i);
1351                         } else {
1352                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
1353                         }
1354                         continue;
1355                 }
1356
1357                 err = obd_quotactl(tgt->ltd_exp, oqctl);
1358                 if (err) {
1359                         if (tgt->ltd_active && !rc)
1360                                 rc = err;
1361                         continue;
1362                 }
1363
1364                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
1365                         curspace += oqctl->qc_dqblk.dqb_curspace;
1366                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
1367                 }
1368         }
1369         obd_putref(obd);
1370
1371         if (oqctl->qc_cmd == Q_GETOQUOTA) {
1372                 oqctl->qc_dqblk.dqb_curspace = curspace;
1373                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
1374         }
1375         return rc;
1376 }
1377
1378 static struct obd_ops lov_obd_ops = {
1379         .owner          = THIS_MODULE,
1380         .setup          = lov_setup,
1381         .cleanup        = lov_cleanup,
1382         /*.process_config       = lov_process_config,*/
1383         .connect        = lov_connect,
1384         .disconnect     = lov_disconnect,
1385         .statfs         = lov_statfs,
1386         .statfs_async   = lov_statfs_async,
1387         .iocontrol      = lov_iocontrol,
1388         .get_info       = lov_get_info,
1389         .set_info_async = lov_set_info_async,
1390         .notify         = lov_notify,
1391         .pool_new       = lov_pool_new,
1392         .pool_rem       = lov_pool_remove,
1393         .pool_add       = lov_pool_add,
1394         .pool_del       = lov_pool_del,
1395         .getref         = lov_getref,
1396         .putref         = lov_putref,
1397         .quotactl       = lov_quotactl,
1398 };
1399
1400 struct kmem_cache *lov_oinfo_slab;
1401
1402 static int __init lov_init(void)
1403 {
1404         struct lprocfs_static_vars lvars = { NULL };
1405         int rc;
1406
1407         /* print an address of _any_ initialized kernel symbol from this
1408          * module, to allow debugging with gdb that doesn't support data
1409          * symbols from modules.
1410          */
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),
1419                                            0, SLAB_HWCACHE_ALIGN, NULL);
1420         if (!lov_oinfo_slab) {
1421                 lu_kmem_fini(lov_caches);
1422                 return -ENOMEM;
1423         }
1424         lprocfs_lov_init_vars(&lvars);
1425
1426         rc = class_register_type(&lov_obd_ops, NULL,
1427                                  LUSTRE_LOV_NAME, &lov_device_type);
1428
1429         if (rc) {
1430                 kmem_cache_destroy(lov_oinfo_slab);
1431                 lu_kmem_fini(lov_caches);
1432         }
1433
1434         return rc;
1435 }
1436
1437 static void /*__exit*/ lov_exit(void)
1438 {
1439         class_unregister_type(LUSTRE_LOV_NAME);
1440         kmem_cache_destroy(lov_oinfo_slab);
1441
1442         lu_kmem_fini(lov_caches);
1443 }
1444
1445 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1446 MODULE_DESCRIPTION("Lustre Logical Object Volume");
1447 MODULE_LICENSE("GPL");
1448 MODULE_VERSION(LUSTRE_VERSION_STRING);
1449
1450 module_init(lov_init);
1451 module_exit(lov_exit);