lustre/lov/lov_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/lov/lov_obd.c
  33  *
  34  * Author: Phil Schwan <phil@clusterfs.com>
  35  * Author: Peter Braam <braam@clusterfs.com>
  36  * Author: Mike Shaver <shaver@clusterfs.com>
  37  * Author: Nathan Rutman <nathan@clusterfs.com>
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_LOV
  41 #include <libcfs/libcfs.h>
  42
  43 #include <cl_object.h>
  44 #include <lustre_dlm.h>
  45 #include <lustre_fid.h>
  46 #include <uapi/linux/lustre/lustre_ioctl.h>
  47 #include <lustre_lib.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_net.h>
  50 #include <uapi/linux/lustre/lustre_param.h>
  51 #include <lustre_swab.h>
  52 #include <lprocfs_status.h>
  53 #include <obd_class.h>
  54 #include <obd_support.h>
  55
  56 #include "lov_internal.h"
  57
  58 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  59    Any function that expects lov_tgts to remain stationary must take a ref. */
  60 static void lov_getref(struct obd_device *obd)
  61 {
  62         struct lov_obd *lov = &obd->u.lov;
  63
  64         /* nobody gets through here until lov_putref is done */
  65         mutex_lock(&lov->lov_lock);
  66         atomic_inc(&lov->lov_refcount);
  67         mutex_unlock(&lov->lov_lock);
  68         return;
  69 }
  70
  71 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  72
  73 static void lov_putref(struct obd_device *obd)
  74 {
  75         struct lov_obd *lov = &obd->u.lov;
  76
  77         mutex_lock(&lov->lov_lock);
  78         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  79         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  80                 struct list_head kill = LIST_HEAD_INIT(kill);
  81                 struct lov_tgt_desc *tgt, *n;
  82                 int i;
  83
  84                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  85                        lov->lov_death_row);
  86                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  87                         tgt = lov->lov_tgts[i];
  88
  89                         if (!tgt || !tgt->ltd_reap)
  90                                 continue;
  91                         list_add(&tgt->ltd_kill, &kill);
  92                         /* XXX - right now there is a dependency on ld_tgt_count
  93                          * being the maximum tgt index for computing the
  94                          * mds_max_easize. So we can't shrink it. */
  95                         lov_ost_pool_remove(&lov->lov_packed, i);
  96                         lov->lov_tgts[i] = NULL;
  97                         lov->lov_death_row--;
  98                 }
  99                 mutex_unlock(&lov->lov_lock);
 100
 101                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 102                         list_del(&tgt->ltd_kill);
 103                         /* Disconnect */
 104                         __lov_del_obd(obd, tgt);
 105                 }
 106         } else {
 107                 mutex_unlock(&lov->lov_lock);
 108         }
 109 }
 110
 111 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 112                               enum obd_notify_event ev);
 113 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 114                       enum obd_notify_event ev);
 115
 116 int lov_connect_obd(struct obd_device *obd, u32 index, int activate,
 117                     struct obd_connect_data *data)
 118 {
 119         struct lov_obd *lov = &obd->u.lov;
 120         struct obd_uuid *tgt_uuid;
 121         struct obd_device *tgt_obd;
 122         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 123         struct obd_import *imp;
 124         int rc;
 125         ENTRY;
 126
 127         if (lov->lov_tgts[index] == NULL)
 128                 RETURN(-EINVAL);
 129
 130         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 131         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 132
 133         if (!tgt_obd->obd_set_up) {
 134                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 135                 RETURN(-EINVAL);
 136         }
 137
 138         /* override the sp_me from lov */
 139         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 140
 141         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 142                 data->ocd_index = index;
 143
 144         /*
 145          * Divine LOV knows that OBDs under it are OSCs.
 146          */
 147         imp = tgt_obd->u.cli.cl_import;
 148
 149         if (activate) {
 150                 tgt_obd->obd_no_recov = 0;
 151                 /* FIXME this is probably supposed to be
 152                    ptlrpc_set_import_active.  Horrible naming. */
 153                 ptlrpc_activate_import(imp);
 154         }
 155
 156         rc = obd_register_observer(tgt_obd, obd);
 157         if (rc) {
 158                 CERROR("Target %s register_observer error %d\n",
 159                        obd_uuid2str(tgt_uuid), rc);
 160                 RETURN(rc);
 161         }
 162
 163
 164         if (imp->imp_invalid) {
 165                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively "
 166                        "disabled\n", obd_uuid2str(tgt_uuid));
 167                 RETURN(0);
 168         }
 169
 170         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 171                          &lov_osc_uuid, data, NULL);
 172         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 173                 CERROR("Target %s connect error %d\n",
 174                        obd_uuid2str(tgt_uuid), rc);
 175                 RETURN(-ENODEV);
 176         }
 177
 178         lov->lov_tgts[index]->ltd_reap = 0;
 179
 180         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 181                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 182
 183         if (lov->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         u32 index;
 322         int rc;
 323
 324         ENTRY;
 325         if (!lov->lov_tgts)
 326                 goto out;
 327
 328         /* Only disconnect the underlying layers on the final disconnect. */
 329         lov->lov_connects--;
 330         if (lov->lov_connects != 0) {
 331                 /* why should there be more than 1 connect? */
 332                 CWARN("%s: unexpected disconnect #%d\n",
 333                       obd->obd_name, lov->lov_connects);
 334                 goto out;
 335         }
 336
 337         /* hold another ref so lov_del_obd() doesn't spin in putref each time */
 338         obd_getref(obd);
 339
 340         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 341                 if (lov->lov_tgts[index] && lov->lov_tgts[index]->ltd_exp) {
 342                         /* Disconnection is the last we know about an OBD */
 343                         lov_del_target(obd, index, NULL,
 344                                        lov->lov_tgts[index]->ltd_gen);
 345                 }
 346         }
 347         obd_putref(obd);
 348
 349         if (lov->targets_proc_entry != NULL)
 350                 lprocfs_remove(&lov->targets_proc_entry);
 351
 352 out:
 353         rc = class_disconnect(exp); /* bz 9811 */
 354         RETURN(rc);
 355 }
 356
 357 /* Error codes:
 358  *
 359  *  -EINVAL  : UUID can't be found in the LOV's target list
 360  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 361  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 362  *  any >= 0 : is log target index
 363  */
 364 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 365                               enum obd_notify_event ev)
 366 {
 367         struct lov_obd *lov = &obd->u.lov;
 368         struct lov_tgt_desc *tgt;
 369         int index, activate, active;
 370         ENTRY;
 371
 372         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 373                lov, uuid->uuid, ev);
 374
 375         obd_getref(obd);
 376         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 377                 tgt = lov->lov_tgts[index];
 378                 if (!tgt)
 379                         continue;
 380                 /*
 381                  * LU-642, initially inactive OSC could miss the obd_connect,
 382                  * we make up for it here.
 383                  */
 384                 if (ev == OBD_NOTIFY_ACTIVATE && tgt->ltd_exp == NULL &&
 385                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 386                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 387
 388                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 389                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 390                 }
 391                 if (!tgt->ltd_exp)
 392                         continue;
 393
 394                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 395                        index, obd_uuid2str(&tgt->ltd_uuid),
 396                        tgt->ltd_exp->exp_handle.h_cookie);
 397                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 398                         break;
 399         }
 400
 401         if (index == lov->desc.ld_tgt_count)
 402                 GOTO(out, index = -EINVAL);
 403
 404         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 405                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 406
 407                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 408                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 409                                uuid->uuid, activate ? "" : "de");
 410                 } else {
 411                         lov->lov_tgts[index]->ltd_activate = activate;
 412                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 413                                activate ? "" : "de", obd_uuid2str(uuid));
 414                 }
 415
 416         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 417                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 418
 419                 if (lov->lov_tgts[index]->ltd_active == active) {
 420                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 421                                uuid->uuid, active ? "" : "in");
 422                         GOTO(out, index);
 423                 } else {
 424                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 425                                obd_uuid2str(uuid), active ? "" : "in");
 426                 }
 427
 428                 lov->lov_tgts[index]->ltd_active = active;
 429                 if (active) {
 430                         lov->desc.ld_active_tgt_count++;
 431                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 432                 } else {
 433                         lov->desc.ld_active_tgt_count--;
 434                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 435                 }
 436         } else {
 437                 CERROR("%s: unknown event %d for uuid %s\n", obd->obd_name,
 438                        ev, uuid->uuid);
 439         }
 440
 441  out:
 442         obd_putref(obd);
 443         RETURN(index);
 444 }
 445
 446 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 447                       enum obd_notify_event ev)
 448 {
 449         int rc = 0;
 450         struct lov_obd *lov = &obd->u.lov;
 451         ENTRY;
 452
 453         down_read(&lov->lov_notify_lock);
 454         if (!lov->lov_connects)
 455                 GOTO(out_notify_lock, rc = 0);
 456
 457         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 458             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 459                 struct obd_uuid *uuid;
 460
 461                 LASSERT(watched);
 462
 463                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 464                         CERROR("unexpected notification of %s %s\n",
 465                                watched->obd_type->typ_name, watched->obd_name);
 466                         GOTO(out_notify_lock, rc = -EINVAL);
 467                 }
 468
 469                 uuid = &watched->u.cli.cl_target_uuid;
 470
 471                 /* Set OSC as active before notifying the observer, so the
 472                  * observer can use the OSC normally.
 473                  */
 474                 rc = lov_set_osc_active(obd, uuid, ev);
 475                 if (rc < 0) {
 476                         CERROR("%s: event %d failed: rc = %d\n", obd->obd_name,
 477                                ev, rc);
 478                         GOTO(out_notify_lock, rc);
 479                 }
 480         }
 481
 482         /* Pass the notification up the chain. */
 483         rc = obd_notify_observer(obd, watched, ev);
 484
 485 out_notify_lock:
 486         up_read(&lov->lov_notify_lock);
 487
 488         RETURN(rc);
 489 }
 490
 491 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 492                           u32 index, int gen, int active)
 493 {
 494         struct lov_obd *lov = &obd->u.lov;
 495         struct lov_tgt_desc *tgt;
 496         struct obd_device *tgt_obd;
 497         int rc;
 498
 499         ENTRY;
 500         CDEBUG(D_CONFIG, "uuid:%s idx:%u gen:%d active:%d\n",
 501                uuidp->uuid, index, gen, active);
 502
 503         if (gen <= 0) {
 504                 CERROR("%s: request to add '%s' with invalid generation: %d\n",
 505                        obd->obd_name, uuidp->uuid, gen);
 506                 RETURN(-EINVAL);
 507         }
 508
 509         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME, &obd->obd_uuid);
 510         if (tgt_obd == NULL)
 511                 RETURN(-EINVAL);
 512
 513         mutex_lock(&lov->lov_lock);
 514
 515         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 516                 tgt = lov->lov_tgts[index];
 517                 rc = -EEXIST;
 518                 CERROR("%s: UUID %s already assigned at index %d: rc = %d\n",
 519                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), index, rc);
 520                 mutex_unlock(&lov->lov_lock);
 521                 RETURN(rc);
 522         }
 523
 524         if (index >= lov->lov_tgt_size) {
 525                 /* We need to reallocate the lov target array. */
 526                 struct lov_tgt_desc **newtgts, **old = NULL;
 527                 __u32 newsize, oldsize = 0;
 528
 529                 newsize = max(lov->lov_tgt_size, (__u32)2);
 530                 while (newsize < index + 1)
 531                         newsize = newsize << 1;
 532                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 533                 if (newtgts == NULL) {
 534                         mutex_unlock(&lov->lov_lock);
 535                         RETURN(-ENOMEM);
 536                 }
 537
 538                 if (lov->lov_tgt_size) {
 539                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 540                                lov->lov_tgt_size);
 541                         old = lov->lov_tgts;
 542                         oldsize = lov->lov_tgt_size;
 543                 }
 544
 545                 lov->lov_tgts = newtgts;
 546                 lov->lov_tgt_size = newsize;
 547                 smp_rmb();
 548                 if (old)
 549                         OBD_FREE(old, sizeof(*old) * oldsize);
 550
 551                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 552                        lov->lov_tgts, lov->lov_tgt_size);
 553         }
 554
 555         OBD_ALLOC_PTR(tgt);
 556         if (!tgt) {
 557                 mutex_unlock(&lov->lov_lock);
 558                 RETURN(-ENOMEM);
 559         }
 560
 561         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 562         if (rc) {
 563                 mutex_unlock(&lov->lov_lock);
 564                 OBD_FREE_PTR(tgt);
 565                 RETURN(rc);
 566         }
 567
 568         tgt->ltd_uuid = *uuidp;
 569         tgt->ltd_obd = tgt_obd;
 570         /* XXX - add a sanity check on the generation number. */
 571         tgt->ltd_gen = gen;
 572         tgt->ltd_index = index;
 573         tgt->ltd_activate = active;
 574         lov->lov_tgts[index] = tgt;
 575         if (index >= lov->desc.ld_tgt_count)
 576                 lov->desc.ld_tgt_count = index + 1;
 577
 578         mutex_unlock(&lov->lov_lock);
 579
 580         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 581                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 582
 583         if (lov->lov_connects == 0) {
 584                 /* lov_connect hasn't been called yet. We'll do the
 585                    lov_connect_obd on this target when that fn first runs,
 586                    because we don't know the connect flags yet. */
 587                 RETURN(0);
 588         }
 589
 590         obd_getref(obd);
 591
 592         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 593         if (rc)
 594                 GOTO(out, rc);
 595
 596         /* connect to administrative disabled ost */
 597         if (!tgt->ltd_exp)
 598                 GOTO(out, rc = 0);
 599
 600         if (lov->lov_cache != NULL) {
 601                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 602                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 603                                 sizeof(struct cl_client_cache), lov->lov_cache,
 604                                 NULL);
 605                 if (rc < 0)
 606                         GOTO(out, rc);
 607         }
 608
 609         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 610                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE);
 611
 612 out:
 613         if (rc) {
 614                 CERROR("%s: add failed, deleting %s: rc = %d\n",
 615                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), rc);
 616                 lov_del_target(obd, index, NULL, 0);
 617         }
 618         obd_putref(obd);
 619         RETURN(rc);
 620 }
 621
 622 /* Schedule a target for deletion */
 623 int lov_del_target(struct obd_device *obd, u32 index,
 624                    struct obd_uuid *uuidp, int gen)
 625 {
 626         struct lov_obd *lov = &obd->u.lov;
 627         int count = lov->desc.ld_tgt_count;
 628         int rc = 0;
 629         ENTRY;
 630
 631         if (index >= count) {
 632                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 633                        index, count);
 634                 RETURN(-EINVAL);
 635         }
 636
 637         /* to make sure there's no ongoing lov_notify() now */
 638         down_write(&lov->lov_notify_lock);
 639         obd_getref(obd);
 640
 641         if (!lov->lov_tgts[index]) {
 642                 CERROR("LOV target at index %d is not setup.\n", index);
 643                 GOTO(out, rc = -EINVAL);
 644         }
 645
 646         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 647                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 648                        lov_uuid2str(lov, index), index,
 649                        obd_uuid2str(uuidp));
 650                 GOTO(out, rc = -EINVAL);
 651         }
 652
 653         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 654                lov_uuid2str(lov, index), index,
 655                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 656                lov->lov_tgts[index]->ltd_active);
 657
 658         lov->lov_tgts[index]->ltd_reap = 1;
 659         lov->lov_death_row++;
 660         /* we really delete it from obd_putref */
 661 out:
 662         obd_putref(obd);
 663         up_write(&lov->lov_notify_lock);
 664
 665         RETURN(rc);
 666 }
 667
 668 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 669 {
 670         struct obd_device *osc_obd;
 671
 672         LASSERT(tgt);
 673         LASSERT(tgt->ltd_reap);
 674
 675         osc_obd = class_exp2obd(tgt->ltd_exp);
 676
 677         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 678                tgt->ltd_uuid.uuid,
 679                osc_obd ? osc_obd->obd_name : "<no obd>");
 680
 681         if (tgt->ltd_exp)
 682                 lov_disconnect_obd(obd, tgt);
 683
 684         OBD_FREE_PTR(tgt);
 685
 686         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 687            do it ourselves. And we can't do it from lov_cleanup,
 688            because we just lost our only reference to it. */
 689         if (osc_obd)
 690                 class_manual_cleanup(osc_obd);
 691 }
 692
 693 void lov_fix_desc_stripe_size(__u64 *val)
 694 {
 695         if (*val < LOV_MIN_STRIPE_SIZE) {
 696                 if (*val != 0)
 697                         LCONSOLE_INFO("Increasing default stripe size to "
 698                                       "minimum %u\n",
 699                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 700                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 701         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 702                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 703                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
 704                               "multiple of %u)\n",
 705                               *val, LOV_MIN_STRIPE_SIZE);
 706         }
 707 }
 708
 709 void lov_fix_desc_stripe_count(__u32 *val)
 710 {
 711         if (*val == 0)
 712                 *val = 1;
 713 }
 714
 715 void lov_fix_desc_pattern(__u32 *val)
 716 {
 717         /* from lov_setstripe */
 718         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 719                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 720                 *val = 0;
 721         }
 722 }
 723
 724 void lov_fix_desc_qos_maxage(__u32 *val)
 725 {
 726         if (*val == 0)
 727                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 728 }
 729
 730 void lov_fix_desc(struct lov_desc *desc)
 731 {
 732         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 733         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 734         lov_fix_desc_pattern(&desc->ld_pattern);
 735         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 736 }
 737
 738 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 739 {
 740         struct lov_desc *desc;
 741         struct lov_obd *lov = &obd->u.lov;
 742 #ifdef CONFIG_PROC_FS
 743         struct obd_type *type;
 744 #endif
 745         int rc;
 746         ENTRY;
 747
 748         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 749                 CERROR("LOV setup requires a descriptor\n");
 750                 RETURN(-EINVAL);
 751         }
 752
 753         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 754
 755         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 756                 CERROR("descriptor size wrong: %d > %d\n",
 757                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 758                 RETURN(-EINVAL);
 759         }
 760
 761         if (desc->ld_magic != LOV_DESC_MAGIC) {
 762                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 763                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 764                                    obd->obd_name, desc);
 765                             lustre_swab_lov_desc(desc);
 766                 } else {
 767                         CERROR("%s: Bad lov desc magic: %#x\n",
 768                                obd->obd_name, desc->ld_magic);
 769                         RETURN(-EINVAL);
 770                 }
 771         }
 772
 773         lov_fix_desc(desc);
 774
 775         desc->ld_active_tgt_count = 0;
 776         lov->desc = *desc;
 777         lov->lov_tgt_size = 0;
 778
 779         mutex_init(&lov->lov_lock);
 780         atomic_set(&lov->lov_refcount, 0);
 781         lov->lov_sp_me = LUSTRE_SP_CLI;
 782
 783         init_rwsem(&lov->lov_notify_lock);
 784
 785         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 786                                                    HASH_POOLS_MAX_BITS,
 787                                                    HASH_POOLS_BKT_BITS, 0,
 788                                                    CFS_HASH_MIN_THETA,
 789                                                    CFS_HASH_MAX_THETA,
 790                                                    &pool_hash_operations,
 791                                                    CFS_HASH_DEFAULT);
 792         INIT_LIST_HEAD(&lov->lov_pool_list);
 793         lov->lov_pool_count = 0;
 794         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 795         if (rc)
 796                 GOTO(out, rc);
 797
 798         obd->obd_vars = lprocfs_lov_obd_vars;
 799 #ifdef CONFIG_PROC_FS
 800         /* If this is true then both client (lov) and server
 801          * (lod) are on the same node. The lod layer if loaded
 802          * first will register the lov proc directory. In that
 803          * case obd->obd_type->typ_procroot will be not set.
 804          * Instead we use type->typ_procsym as the parent.
 805          */
 806         type = class_search_type(LUSTRE_LOD_NAME);
 807         if (type && type->typ_procsym) {
 808                 obd->obd_proc_entry = lprocfs_register(obd->obd_name,
 809                                                        type->typ_procsym,
 810                                                        obd->obd_vars, obd);
 811                 if (IS_ERR(obd->obd_proc_entry)) {
 812                         rc = PTR_ERR(obd->obd_proc_entry);
 813                         CERROR("error %d setting up lprocfs for %s\n", rc,
 814                                obd->obd_name);
 815                         obd->obd_proc_entry = NULL;
 816                 }
 817         }
 818 #endif
 819
 820         rc = lprocfs_obd_setup(obd, false);
 821         if (rc)
 822                 GOTO(out, rc);
 823
 824         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd", 0444,
 825                                 &lov_proc_target_fops, obd);
 826         if (rc)
 827                 CWARN("%s: Error adding the target_obd file : rc %d\n",
 828                       obd->obd_name, rc);
 829
 830         lov->lov_pool_proc_entry = lprocfs_register("pools",
 831                                                     obd->obd_proc_entry,
 832                                                     NULL, NULL);
 833         if (IS_ERR(lov->lov_pool_proc_entry)) {
 834                 rc = PTR_ERR(lov->lov_pool_proc_entry);
 835                 CERROR("%s: error setting up ldebugfs for pools : rc %d\n",
 836                        obd->obd_name, rc);
 837                 lov->lov_pool_proc_entry = NULL;
 838         }
 839 out:
 840         return rc;
 841 }
 842
 843 static int lov_cleanup(struct obd_device *obd)
 844 {
 845         struct lov_obd *lov = &obd->u.lov;
 846         struct list_head *pos, *tmp;
 847         struct pool_desc *pool;
 848         ENTRY;
 849
 850         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 851                 pool = list_entry(pos, struct pool_desc, pool_list);
 852                 /* free pool structs */
 853                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 854                 /* In the function below, .hs_keycmp resolves to
 855                  * pool_hashkey_keycmp() */
 856                 /* coverity[overrun-buffer-val] */
 857                 lov_pool_del(obd, pool->pool_name);
 858         }
 859         cfs_hash_putref(lov->lov_pools_hash_body);
 860         lov_ost_pool_free(&lov->lov_packed);
 861
 862         lprocfs_obd_cleanup(obd);
 863         if (lov->lov_tgts) {
 864                 int i;
 865                 obd_getref(obd);
 866                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 867                         if (!lov->lov_tgts[i])
 868                                 continue;
 869
 870                         /* Inactive targets may never have connected */
 871                         if (lov->lov_tgts[i]->ltd_active ||
 872                             atomic_read(&lov->lov_refcount))
 873                                 /* We should never get here - these
 874                                  * should have been removed in the
 875                                  * disconnect. */
 876                                 CERROR("%s: lov tgt %d not cleaned! "
 877                                        "deathrow=%d, lovrc=%d\n",
 878                                        obd->obd_name, i, lov->lov_death_row,
 879                                        atomic_read(&lov->lov_refcount));
 880                         lov_del_target(obd, i, NULL, 0);
 881                 }
 882                 obd_putref(obd);
 883                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 884                          lov->lov_tgt_size);
 885                 lov->lov_tgt_size = 0;
 886         }
 887
 888         if (lov->lov_cache != NULL) {
 889                 cl_cache_decref(lov->lov_cache);
 890                 lov->lov_cache = NULL;
 891         }
 892
 893         RETURN(0);
 894 }
 895
 896 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 897                             u32 *indexp, int *genp)
 898 {
 899         struct obd_uuid obd_uuid;
 900         int cmd;
 901         int rc = 0;
 902
 903         ENTRY;
 904         switch (cmd = lcfg->lcfg_command) {
 905         case LCFG_ADD_MDC:
 906         case LCFG_DEL_MDC:
 907                 break;
 908         case LCFG_LOV_ADD_OBD:
 909         case LCFG_LOV_ADD_INA:
 910         case LCFG_LOV_DEL_OBD: {
 911                 u32 index;
 912                 int gen;
 913
 914                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 915                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
 916                         GOTO(out, rc = -EINVAL);
 917
 918                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 919
 920                 rc = kstrtou32(lustre_cfg_buf(lcfg, 2), 10, indexp);
 921                 if (rc)
 922                         GOTO(out, rc);
 923                 rc = kstrtoint(lustre_cfg_buf(lcfg, 3), 10, genp);
 924                 if (rc)
 925                         GOTO(out, rc);
 926                 index = *indexp;
 927                 gen = *genp;
 928                 if (cmd == LCFG_LOV_ADD_OBD)
 929                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 930                 else if (cmd == LCFG_LOV_ADD_INA)
 931                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 932                 else
 933                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 934
 935                 GOTO(out, rc);
 936         }
 937         case LCFG_PARAM: {
 938                 struct lov_desc *desc = &(obd->u.lov.desc);
 939
 940                 if (!desc)
 941                         GOTO(out, rc = -EINVAL);
 942
 943                 rc = class_process_proc_param(PARAM_LOV, obd->obd_vars,
 944                                               lcfg, obd);
 945                 if (rc > 0)
 946                         rc = 0;
 947                 GOTO(out, rc);
 948         }
 949         case LCFG_POOL_NEW:
 950         case LCFG_POOL_ADD:
 951         case LCFG_POOL_DEL:
 952         case LCFG_POOL_REM:
 953                 GOTO(out, rc);
 954
 955         default: {
 956                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 957                 GOTO(out, rc = -EINVAL);
 958
 959         }
 960         }
 961 out:
 962         RETURN(rc);
 963 }
 964
 965 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
 966                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
 967 {
 968         struct obd_device *obd = class_exp2obd(exp);
 969         struct lov_obd *lov = &obd->u.lov;
 970         struct obd_info oinfo = {
 971                 .oi_osfs = osfs,
 972                 .oi_flags = flags,
 973         };
 974         struct ptlrpc_request_set *rqset;
 975         struct lov_request_set *set = NULL;
 976         struct lov_request *req;
 977         int rc = 0;
 978         int rc2;
 979
 980         ENTRY;
 981
 982         rqset = ptlrpc_prep_set();
 983         if (rqset == NULL)
 984                 RETURN(-ENOMEM);
 985
 986         rc = lov_prep_statfs_set(obd, &oinfo, &set);
 987         if (rc < 0)
 988                 GOTO(out_rqset, rc);
 989
 990         list_for_each_entry(req, &set->set_list, rq_link) {
 991                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
 992                                       &req->rq_oi, max_age, rqset);
 993                 if (rc < 0)
 994                         GOTO(out_set, rc);
 995         }
 996
 997         rc = ptlrpc_set_wait(rqset);
 998
 999 out_set:
1000         if (rc < 0)
1001                 atomic_set(&set->set_completes, 0);
1002
1003         rc2 = lov_fini_statfs_set(set);
1004         if (rc == 0)
1005                 rc = rc2;
1006
1007 out_rqset:
1008         ptlrpc_set_destroy(rqset);
1009
1010         RETURN(rc);
1011 }
1012
1013 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1014                          void *karg, void __user *uarg)
1015 {
1016         struct obd_device *obddev = class_exp2obd(exp);
1017         struct lov_obd *lov = &obddev->u.lov;
1018         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1019         struct obd_uuid *uuidp;
1020         ENTRY;
1021
1022         switch (cmd) {
1023         case IOC_OBD_STATFS: {
1024                 struct obd_ioctl_data *data = karg;
1025                 struct obd_device *osc_obd;
1026                 struct obd_statfs stat_buf = {0};
1027                 __u32 index;
1028                 __u32 flags;
1029
1030                 memcpy(&index, data->ioc_inlbuf2, sizeof(index));
1031                 if ((index >= count))
1032                         RETURN(-ENODEV);
1033
1034                 if (!lov->lov_tgts[index])
1035                         /* Try again with the next index */
1036                         RETURN(-EAGAIN);
1037                 if (!lov->lov_tgts[index]->ltd_active)
1038                         RETURN(-ENODATA);
1039
1040                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1041                 if (!osc_obd)
1042                         RETURN(-EINVAL);
1043
1044                 /* copy UUID */
1045                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1046                                  min_t(unsigned long, data->ioc_plen2,
1047                                        sizeof(struct obd_uuid))))
1048                         RETURN(-EFAULT);
1049
1050                 memcpy(&flags, data->ioc_inlbuf1, sizeof(flags));
1051                 flags = flags & LL_STATFS_NODELAY ? OBD_STATFS_NODELAY : 0;
1052
1053                 /* got statfs data */
1054                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1055                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
1056                                 flags);
1057                 if (rc)
1058                         RETURN(rc);
1059                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1060                                  min_t(unsigned long, data->ioc_plen1,
1061                                        sizeof(struct obd_statfs))))
1062                         RETURN(-EFAULT);
1063                 break;
1064         }
1065         case OBD_IOC_LOV_GET_CONFIG: {
1066                 struct obd_ioctl_data *data;
1067                 struct lov_desc *desc;
1068                 char *buf = NULL;
1069                 __u32 *genp;
1070
1071                 len = 0;
1072                 if (obd_ioctl_getdata(&buf, &len, uarg))
1073                         RETURN(-EINVAL);
1074
1075                 data = (struct obd_ioctl_data *)buf;
1076
1077                 if (sizeof(*desc) > data->ioc_inllen1) {
1078                         OBD_FREE_LARGE(buf, len);
1079                         RETURN(-EINVAL);
1080                 }
1081
1082                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1083                         OBD_FREE_LARGE(buf, len);
1084                         RETURN(-EINVAL);
1085                 }
1086
1087                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1088                         OBD_FREE_LARGE(buf, len);
1089                         RETURN(-EINVAL);
1090                 }
1091
1092                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1093                 memcpy(desc, &(lov->desc), sizeof(*desc));
1094
1095                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1096                 genp = (__u32 *)data->ioc_inlbuf3;
1097                 /* the uuid will be empty for deleted OSTs */
1098                 for (i = 0; i < count; i++, uuidp++, genp++) {
1099                         if (!lov->lov_tgts[i])
1100                                 continue;
1101                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1102                         *genp = lov->lov_tgts[i]->ltd_gen;
1103                 }
1104
1105                 if (copy_to_user(uarg, buf, len))
1106                         rc = -EFAULT;
1107                 OBD_FREE_LARGE(buf, len);
1108                 break;
1109         }
1110         case OBD_IOC_QUOTACTL: {
1111                 struct if_quotactl *qctl = karg;
1112                 struct lov_tgt_desc *tgt = NULL;
1113                 struct obd_quotactl *oqctl;
1114
1115                 if (qctl->qc_valid == QC_OSTIDX) {
1116                         if (count <= qctl->qc_idx)
1117                                 RETURN(-EINVAL);
1118
1119                         tgt = lov->lov_tgts[qctl->qc_idx];
1120                         if (!tgt || !tgt->ltd_exp)
1121                                 RETURN(-EINVAL);
1122                 } else if (qctl->qc_valid == QC_UUID) {
1123                         for (i = 0; i < count; i++) {
1124                                 tgt = lov->lov_tgts[i];
1125                                 if (!tgt ||
1126                                     !obd_uuid_equals(&tgt->ltd_uuid,
1127                                                      &qctl->obd_uuid))
1128                                         continue;
1129
1130                                 if (tgt->ltd_exp == NULL)
1131                                         RETURN(-EINVAL);
1132
1133                                 break;
1134                         }
1135                 } else {
1136                         RETURN(-EINVAL);
1137                 }
1138
1139                 if (i >= count)
1140                         RETURN(-EAGAIN);
1141
1142                 LASSERT(tgt && tgt->ltd_exp);
1143                 OBD_ALLOC_PTR(oqctl);
1144                 if (!oqctl)
1145                         RETURN(-ENOMEM);
1146
1147                 QCTL_COPY(oqctl, qctl);
1148                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1149                 if (rc == 0) {
1150                         QCTL_COPY(qctl, oqctl);
1151                         qctl->qc_valid = QC_OSTIDX;
1152                         qctl->obd_uuid = tgt->ltd_uuid;
1153                 }
1154                 OBD_FREE_PTR(oqctl);
1155                 break;
1156         }
1157         default: {
1158                 int set = 0;
1159
1160                 if (count == 0)
1161                         RETURN(-ENOTTY);
1162
1163                 for (i = 0; i < count; i++) {
1164                         int err;
1165                         struct obd_device *osc_obd;
1166
1167                         /* OST was disconnected */
1168                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1169                                 continue;
1170
1171                         /* ll_umount_begin() sets force flag but for lov, not
1172                          * osc. Let's pass it through */
1173                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1174                         osc_obd->obd_force = obddev->obd_force;
1175                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1176                                             len, karg, uarg);
1177                         if (err) {
1178                                 if (lov->lov_tgts[i]->ltd_active) {
1179                                         CDEBUG(err == -ENOTTY ?
1180                                                D_IOCTL : D_WARNING,
1181                                                "iocontrol OSC %s on OST "
1182                                                "idx %d cmd %x: err = %d\n",
1183                                                lov_uuid2str(lov, i),
1184                                                i, cmd, err);
1185                                         if (!rc)
1186                                                 rc = err;
1187                                 }
1188                         } else {
1189                                 set = 1;
1190                         }
1191                 }
1192                 if (!set && !rc)
1193                         rc = -EIO;
1194         }
1195         }
1196
1197         RETURN(rc);
1198 }
1199
1200 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1201                         __u32 keylen, void *key, __u32 *vallen, void *val)
1202 {
1203         struct obd_device *obddev = class_exp2obd(exp);
1204         struct lov_obd *lov = &obddev->u.lov;
1205         struct lov_desc *ld = &lov->desc;
1206         int rc = 0;
1207         ENTRY;
1208
1209         if (vallen == NULL || val == NULL)
1210                 RETURN(-EFAULT);
1211
1212         obd_getref(obddev);
1213
1214         if (KEY_IS(KEY_MAX_EASIZE)) {
1215                 u32 max_stripe_count = min_t(u32, ld->ld_active_tgt_count,
1216                                              LOV_MAX_STRIPE_COUNT);
1217
1218                 *((u32 *)val) = lov_mds_md_size(max_stripe_count, LOV_MAGIC_V3);
1219         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
1220                 u32 def_stripe_count = min_t(u32, ld->ld_default_stripe_count,
1221                                              LOV_MAX_STRIPE_COUNT);
1222
1223                 *((u32 *)val) = lov_mds_md_size(def_stripe_count, LOV_MAGIC_V3);
1224         } else if (KEY_IS(KEY_TGT_COUNT)) {
1225                 *((int *)val) = lov->desc.ld_tgt_count;
1226         } else {
1227                 rc = -EINVAL;
1228         }
1229
1230         obd_putref(obddev);
1231
1232         RETURN(rc);
1233 }
1234
1235 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
1236                               __u32 keylen, void *key,
1237                               __u32 vallen, void *val,
1238                               struct ptlrpc_request_set *set)
1239 {
1240         struct obd_device *obddev = class_exp2obd(exp);
1241         struct lov_obd *lov = &obddev->u.lov;
1242         struct lov_tgt_desc *tgt;
1243         bool do_inactive = false, no_set = false;
1244         u32 i;
1245         int rc = 0;
1246         int err;
1247
1248         ENTRY;
1249
1250         if (set == NULL) {
1251                 no_set = true;
1252                 set = ptlrpc_prep_set();
1253                 if (!set)
1254                         RETURN(-ENOMEM);
1255         }
1256
1257         obd_getref(obddev);
1258
1259         if (KEY_IS(KEY_CHECKSUM)) {
1260                 do_inactive = true;
1261         } else if (KEY_IS(KEY_CACHE_SET)) {
1262                 LASSERT(lov->lov_cache == NULL);
1263                 lov->lov_cache = val;
1264                 do_inactive = true;
1265                 cl_cache_incref(lov->lov_cache);
1266         }
1267
1268         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1269                 tgt = lov->lov_tgts[i];
1270
1271                 /* OST was disconnected */
1272                 if (tgt == NULL || tgt->ltd_exp == NULL)
1273                         continue;
1274
1275                 /* OST is inactive and we don't want inactive OSCs */
1276                 if (!tgt->ltd_active && !do_inactive)
1277                         continue;
1278
1279                 err = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1280                                          vallen, val, set);
1281
1282                 if (rc == 0)
1283                         rc = err;
1284         }
1285
1286         /* cycle through MDC target for Data-on-MDT */
1287         for (i = 0; i < LOV_MDC_TGT_MAX; i++) {
1288                 struct obd_device *mdc;
1289
1290                 mdc = lov->lov_mdc_tgts[i].lmtd_mdc;
1291                 if (mdc == NULL)
1292                         continue;
1293
1294                 err = obd_set_info_async(env, mdc->obd_self_export,
1295                                          keylen, key, vallen, val, set);
1296                 if (rc == 0)
1297                         rc = err;
1298         }
1299
1300         obd_putref(obddev);
1301         if (no_set) {
1302                 err = ptlrpc_set_wait(set);
1303                 if (rc == 0)
1304                         rc = err;
1305                 ptlrpc_set_destroy(set);
1306         }
1307         RETURN(rc);
1308 }
1309
1310 void lov_stripe_lock(struct lov_stripe_md *md)
1311 __acquires(&md->lsm_lock)
1312 {
1313         LASSERT(md->lsm_lock_owner != current_pid());
1314         spin_lock(&md->lsm_lock);
1315         LASSERT(md->lsm_lock_owner == 0);
1316         md->lsm_lock_owner = current_pid();
1317 }
1318
1319 void lov_stripe_unlock(struct lov_stripe_md *md)
1320 __releases(&md->lsm_lock)
1321 {
1322         LASSERT(md->lsm_lock_owner == current_pid());
1323         md->lsm_lock_owner = 0;
1324         spin_unlock(&md->lsm_lock);
1325 }
1326
1327 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
1328                         struct obd_quotactl *oqctl)
1329 {
1330         struct lov_obd      *lov = &obd->u.lov;
1331         struct lov_tgt_desc *tgt;
1332         __u64                curspace = 0;
1333         __u64                bhardlimit = 0;
1334         int                  i, rc = 0;
1335         ENTRY;
1336
1337         if (oqctl->qc_cmd != Q_GETOQUOTA &&
1338             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA) {
1339                 CERROR("%s: bad quota opc %x for lov obd\n",
1340                        obd->obd_name, oqctl->qc_cmd);
1341                 RETURN(-EFAULT);
1342         }
1343
1344         /* for lov tgt */
1345         obd_getref(obd);
1346         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1347                 int err;
1348
1349                 tgt = lov->lov_tgts[i];
1350
1351                 if (!tgt)
1352                         continue;
1353
1354                 if (!tgt->ltd_active || tgt->ltd_reap) {
1355                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
1356                             lov->lov_tgts[i]->ltd_activate) {
1357                                 rc = -ENETDOWN;
1358                                 CERROR("ost %d is inactive\n", i);
1359                         } else {
1360                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
1361                         }
1362                         continue;
1363                 }
1364
1365                 err = obd_quotactl(tgt->ltd_exp, oqctl);
1366                 if (err) {
1367                         if (tgt->ltd_active && !rc)
1368                                 rc = err;
1369                         continue;
1370                 }
1371
1372                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
1373                         curspace += oqctl->qc_dqblk.dqb_curspace;
1374                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
1375                 }
1376         }
1377         obd_putref(obd);
1378
1379         if (oqctl->qc_cmd == Q_GETOQUOTA) {
1380                 oqctl->qc_dqblk.dqb_curspace = curspace;
1381                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
1382         }
1383         RETURN(rc);
1384 }
1385
1386 static struct obd_ops lov_obd_ops = {
1387         .o_owner                = THIS_MODULE,
1388         .o_setup                = lov_setup,
1389         .o_cleanup              = lov_cleanup,
1390         .o_connect              = lov_connect,
1391         .o_disconnect           = lov_disconnect,
1392         .o_statfs               = lov_statfs,
1393         .o_iocontrol            = lov_iocontrol,
1394         .o_get_info             = lov_get_info,
1395         .o_set_info_async       = lov_set_info_async,
1396         .o_notify               = lov_notify,
1397         .o_pool_new             = lov_pool_new,
1398         .o_pool_rem             = lov_pool_remove,
1399         .o_pool_add             = lov_pool_add,
1400         .o_pool_del             = lov_pool_del,
1401         .o_getref               = lov_getref,
1402         .o_putref               = lov_putref,
1403         .o_quotactl             = lov_quotactl,
1404 };
1405
1406 struct kmem_cache *lov_oinfo_slab;
1407
1408 static int __init lov_init(void)
1409 {
1410         bool enable_proc = true;
1411         struct obd_type *type;
1412         int rc;
1413         ENTRY;
1414
1415         /* print an address of _any_ initialized kernel symbol from this
1416          * module, to allow debugging with gdb that doesn't support data
1417          * symbols from modules.*/
1418         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
1419
1420         rc = lu_kmem_init(lov_caches);
1421         if (rc)
1422                 return rc;
1423
1424         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
1425                                            sizeof(struct lov_oinfo), 0,
1426                                            SLAB_HWCACHE_ALIGN, NULL);
1427         if (lov_oinfo_slab == NULL) {
1428                 lu_kmem_fini(lov_caches);
1429                 return -ENOMEM;
1430         }
1431
1432         type = class_search_type(LUSTRE_LOD_NAME);
1433         if (type != NULL && type->typ_procsym != NULL)
1434                 enable_proc = false;
1435
1436         rc = class_register_type(&lov_obd_ops, NULL, enable_proc, NULL,
1437                                  LUSTRE_LOV_NAME, &lov_device_type);
1438
1439         if (rc) {
1440                 kmem_cache_destroy(lov_oinfo_slab);
1441                 lu_kmem_fini(lov_caches);
1442         }
1443
1444         RETURN(rc);
1445 }
1446
1447 static void __exit lov_exit(void)
1448 {
1449         class_unregister_type(LUSTRE_LOV_NAME);
1450         kmem_cache_destroy(lov_oinfo_slab);
1451         lu_kmem_fini(lov_caches);
1452 }
1453
1454 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1455 MODULE_DESCRIPTION("Lustre Logical Object Volume");
1456 MODULE_VERSION(LUSTRE_VERSION_STRING);
1457 MODULE_LICENSE("GPL");
1458
1459 module_init(lov_init);
1460 module_exit(lov_exit);