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/obd_support.h"
  44 #include "../include/lustre/lustre_ioctl.h"
  45 #include "../include/lustre_lib.h"
  46 #include "../include/lustre_net.h"
  47 #include "../include/lustre/lustre_idl.h"
  48 #include "../include/lustre_dlm.h"
  49 #include "../include/lustre_mds.h"
  50 #include "../include/obd_class.h"
  51 #include "../include/lprocfs_status.h"
  52 #include "../include/lustre_param.h"
  53 #include "../include/cl_object.h"
  54 #include "../include/lustre/ll_fiemap.h"
  55 #include "../include/lustre_fid.h"
  56
  57 #include "lov_internal.h"
  58
  59 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  60  * Any function that expects lov_tgts to remain stationary must take a ref.
  61  */
  62 static void lov_getref(struct obd_device *obd)
  63 {
  64         struct lov_obd *lov = &obd->u.lov;
  65
  66         /* nobody gets through here until lov_putref is done */
  67         mutex_lock(&lov->lov_lock);
  68         atomic_inc(&lov->lov_refcount);
  69         mutex_unlock(&lov->lov_lock);
  70         return;
  71 }
  72
  73 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  74
  75 static void lov_putref(struct obd_device *obd)
  76 {
  77         struct lov_obd *lov = &obd->u.lov;
  78
  79         mutex_lock(&lov->lov_lock);
  80         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  81         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  82                 LIST_HEAD(kill);
  83                 int i;
  84                 struct lov_tgt_desc *tgt, *n;
  85
  86                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  87                        lov->lov_death_row);
  88                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  89                         tgt = lov->lov_tgts[i];
  90
  91                         if (!tgt || !tgt->ltd_reap)
  92                                 continue;
  93                         list_add(&tgt->ltd_kill, &kill);
  94                         /* XXX - right now there is a dependency on ld_tgt_count
  95                          * being the maximum tgt index for computing the
  96                          * mds_max_easize. So we can't shrink it.
  97                          */
  98                         lov_ost_pool_remove(&lov->lov_packed, i);
  99                         lov->lov_tgts[i] = NULL;
 100                         lov->lov_death_row--;
 101                 }
 102                 mutex_unlock(&lov->lov_lock);
 103
 104                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 105                         list_del(&tgt->ltd_kill);
 106                         /* Disconnect */
 107                         __lov_del_obd(obd, tgt);
 108                 }
 109
 110                 if (lov->lov_tgts_kobj)
 111                         kobject_put(lov->lov_tgts_kobj);
 112
 113         } else {
 114                 mutex_unlock(&lov->lov_lock);
 115         }
 116 }
 117
 118 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 119                               enum obd_notify_event ev);
 120 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 121                       enum obd_notify_event ev, void *data);
 122
 123 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 124                     struct obd_connect_data *data)
 125 {
 126         struct lov_obd *lov = &obd->u.lov;
 127         struct obd_uuid *tgt_uuid;
 128         struct obd_device *tgt_obd;
 129         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 130         struct obd_import *imp;
 131         int rc;
 132
 133         if (!lov->lov_tgts[index])
 134                 return -EINVAL;
 135
 136         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
 137         tgt_obd = lov->lov_tgts[index]->ltd_obd;
 138
 139         if (!tgt_obd->obd_set_up) {
 140                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
 141                 return -EINVAL;
 142         }
 143
 144         /* override the sp_me from lov */
 145         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
 146
 147         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
 148                 data->ocd_index = index;
 149
 150         /*
 151          * Divine LOV knows that OBDs under it are OSCs.
 152          */
 153         imp = tgt_obd->u.cli.cl_import;
 154
 155         if (activate) {
 156                 tgt_obd->obd_no_recov = 0;
 157                 /* FIXME this is probably supposed to be
 158                  * ptlrpc_set_import_active.  Horrible naming.
 159                  */
 160                 ptlrpc_activate_import(imp);
 161         }
 162
 163         rc = obd_register_observer(tgt_obd, obd);
 164         if (rc) {
 165                 CERROR("Target %s register_observer error %d\n",
 166                        obd_uuid2str(tgt_uuid), rc);
 167                 return rc;
 168         }
 169
 170         if (imp->imp_invalid) {
 171                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively disabled\n",
 172                        obd_uuid2str(tgt_uuid));
 173                 return 0;
 174         }
 175
 176         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
 177                          &lov_osc_uuid, data, NULL);
 178         if (rc || !lov->lov_tgts[index]->ltd_exp) {
 179                 CERROR("Target %s connect error %d\n",
 180                        obd_uuid2str(tgt_uuid), rc);
 181                 return -ENODEV;
 182         }
 183
 184         lov->lov_tgts[index]->ltd_reap = 0;
 185
 186         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
 187                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
 188
 189         if (lov->lov_tgts_kobj)
 190                 /* Even if we failed, that's ok */
 191                 rc = sysfs_create_link(lov->lov_tgts_kobj, &tgt_obd->obd_kobj,
 192                                        tgt_obd->obd_name);
 193
 194         return 0;
 195 }
 196
 197 static int lov_connect(const struct lu_env *env,
 198                        struct obd_export **exp, struct obd_device *obd,
 199                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 200                        void *localdata)
 201 {
 202         struct lov_obd *lov = &obd->u.lov;
 203         struct lov_tgt_desc *tgt;
 204         struct lustre_handle conn;
 205         int i, rc;
 206
 207         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 208
 209         rc = class_connect(&conn, obd, cluuid);
 210         if (rc)
 211                 return rc;
 212
 213         *exp = class_conn2export(&conn);
 214
 215         /* Why should there ever be more than 1 connect? */
 216         lov->lov_connects++;
 217         LASSERT(lov->lov_connects == 1);
 218
 219         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 220         if (data)
 221                 lov->lov_ocd = *data;
 222
 223         obd_getref(obd);
 224
 225         lov->lov_tgts_kobj = kobject_create_and_add("target_obds",
 226                                                     &obd->obd_kobj);
 227
 228         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 229                 tgt = lov->lov_tgts[i];
 230                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 231                         continue;
 232                 /* Flags will be lowest common denominator */
 233                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 234                 if (rc) {
 235                         CERROR("%s: lov connect tgt %d failed: %d\n",
 236                                obd->obd_name, i, rc);
 237                         continue;
 238                 }
 239                 /* connect to administrative disabled ost */
 240                 if (!lov->lov_tgts[i]->ltd_exp)
 241                         continue;
 242
 243                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 244                                 OBD_NOTIFY_CONNECT, (void *)&i);
 245                 if (rc) {
 246                         CERROR("%s error sending notify %d\n",
 247                                obd->obd_name, rc);
 248                 }
 249         }
 250         obd_putref(obd);
 251
 252         return 0;
 253 }
 254
 255 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 256 {
 257         struct lov_obd *lov = &obd->u.lov;
 258         struct obd_device *osc_obd;
 259         int rc;
 260
 261         osc_obd = class_exp2obd(tgt->ltd_exp);
 262         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 263                obd->obd_name, osc_obd ? osc_obd->obd_name : "NULL");
 264
 265         if (tgt->ltd_active) {
 266                 tgt->ltd_active = 0;
 267                 lov->desc.ld_active_tgt_count--;
 268                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 269         }
 270
 271         if (osc_obd) {
 272                 if (lov->lov_tgts_kobj)
 273                         sysfs_remove_link(lov->lov_tgts_kobj,
 274                                           osc_obd->obd_name);
 275
 276                 /* Pass it on to our clients.
 277                  * XXX This should be an argument to disconnect,
 278                  * XXX not a back-door flag on the OBD.  Ah well.
 279                  */
 280                 osc_obd->obd_force = obd->obd_force;
 281                 osc_obd->obd_fail = obd->obd_fail;
 282                 osc_obd->obd_no_recov = obd->obd_no_recov;
 283         }
 284
 285         obd_register_observer(osc_obd, NULL);
 286
 287         rc = obd_disconnect(tgt->ltd_exp);
 288         if (rc) {
 289                 CERROR("Target %s disconnect error %d\n",
 290                        tgt->ltd_uuid.uuid, rc);
 291                 rc = 0;
 292         }
 293
 294         tgt->ltd_exp = NULL;
 295         return 0;
 296 }
 297
 298 static int lov_disconnect(struct obd_export *exp)
 299 {
 300         struct obd_device *obd = class_exp2obd(exp);
 301         struct lov_obd *lov = &obd->u.lov;
 302         int i, rc;
 303
 304         if (!lov->lov_tgts)
 305                 goto out;
 306
 307         /* Only disconnect the underlying layers on the final disconnect. */
 308         lov->lov_connects--;
 309         if (lov->lov_connects != 0) {
 310                 /* why should there be more than 1 connect? */
 311                 CERROR("disconnect #%d\n", lov->lov_connects);
 312                 goto out;
 313         }
 314
 315         /* Let's hold another reference so lov_del_obd doesn't spin through
 316          * putref every time
 317          */
 318         obd_getref(obd);
 319
 320         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 321                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 322                         /* Disconnection is the last we know about an obd */
 323                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
 324                 }
 325         }
 326
 327         obd_putref(obd);
 328
 329 out:
 330         rc = class_disconnect(exp); /* bz 9811 */
 331         return rc;
 332 }
 333
 334 /* Error codes:
 335  *
 336  *  -EINVAL  : UUID can't be found in the LOV's target list
 337  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 338  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 339  *  any >= 0 : is log target index
 340  */
 341 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 342                               enum obd_notify_event ev)
 343 {
 344         struct lov_obd *lov = &obd->u.lov;
 345         struct lov_tgt_desc *tgt;
 346         int index, activate, active;
 347
 348         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 349                lov, uuid->uuid, ev);
 350
 351         obd_getref(obd);
 352         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 353                 tgt = lov->lov_tgts[index];
 354                 if (!tgt)
 355                         continue;
 356                 /*
 357                  * LU-642, initially inactive OSC could miss the obd_connect,
 358                  * we make up for it here.
 359                  */
 360                 if (ev == OBD_NOTIFY_ACTIVATE && !tgt->ltd_exp &&
 361                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 362                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 363
 364                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 365                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 366                 }
 367                 if (!tgt->ltd_exp)
 368                         continue;
 369
 370                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 371                        index, obd_uuid2str(&tgt->ltd_uuid),
 372                        tgt->ltd_exp->exp_handle.h_cookie);
 373                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 374                         break;
 375         }
 376
 377         if (index == lov->desc.ld_tgt_count) {
 378                 index = -EINVAL;
 379                 goto out;
 380         }
 381
 382         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 383                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 384
 385                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 386                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 387                                uuid->uuid, activate ? "" : "de");
 388                 } else {
 389                         lov->lov_tgts[index]->ltd_activate = activate;
 390                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 391                                activate ? "" : "de", obd_uuid2str(uuid));
 392                 }
 393
 394         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 395                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 396
 397                 if (lov->lov_tgts[index]->ltd_active == active) {
 398                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 399                                uuid->uuid, active ? "" : "in");
 400                         goto out;
 401                 }
 402                 CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 403                        obd_uuid2str(uuid), active ? "" : "in");
 404
 405                 lov->lov_tgts[index]->ltd_active = active;
 406                 if (active) {
 407                         lov->desc.ld_active_tgt_count++;
 408                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 409                 } else {
 410                         lov->desc.ld_active_tgt_count--;
 411                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 412                 }
 413         } else {
 414                 CERROR("Unknown event(%d) for uuid %s", ev, uuid->uuid);
 415         }
 416
 417  out:
 418         obd_putref(obd);
 419         return index;
 420 }
 421
 422 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 423                       enum obd_notify_event ev, void *data)
 424 {
 425         int rc = 0;
 426         struct lov_obd *lov = &obd->u.lov;
 427
 428         down_read(&lov->lov_notify_lock);
 429         if (!lov->lov_connects) {
 430                 up_read(&lov->lov_notify_lock);
 431                 return rc;
 432         }
 433
 434         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 435             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 436                 struct obd_uuid *uuid;
 437
 438                 LASSERT(watched);
 439
 440                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 441                         up_read(&lov->lov_notify_lock);
 442                         CERROR("unexpected notification of %s %s!\n",
 443                                watched->obd_type->typ_name,
 444                                watched->obd_name);
 445                         return -EINVAL;
 446                 }
 447                 uuid = &watched->u.cli.cl_target_uuid;
 448
 449                 /* Set OSC as active before notifying the observer, so the
 450                  * observer can use the OSC normally.
 451                  */
 452                 rc = lov_set_osc_active(obd, uuid, ev);
 453                 if (rc < 0) {
 454                         up_read(&lov->lov_notify_lock);
 455                         CERROR("event(%d) of %s failed: %d\n", ev,
 456                                obd_uuid2str(uuid), rc);
 457                         return rc;
 458                 }
 459                 /* active event should be pass lov target index as data */
 460                 data = &rc;
 461         }
 462
 463         /* Pass the notification up the chain. */
 464         if (watched) {
 465                 rc = obd_notify_observer(obd, watched, ev, data);
 466         } else {
 467                 /* NULL watched means all osc's in the lov (only for syncs) */
 468                 /* sync event should be send lov idx as data */
 469                 struct lov_obd *lov = &obd->u.lov;
 470                 int i, is_sync;
 471
 472                 data = &i;
 473                 is_sync = (ev == OBD_NOTIFY_SYNC) ||
 474                           (ev == OBD_NOTIFY_SYNC_NONBLOCK);
 475
 476                 obd_getref(obd);
 477                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 478                         if (!lov->lov_tgts[i])
 479                                 continue;
 480
 481                         /* don't send sync event if target not
 482                          * connected/activated
 483                          */
 484                         if (is_sync &&  !lov->lov_tgts[i]->ltd_active)
 485                                 continue;
 486
 487                         rc = obd_notify_observer(obd, lov->lov_tgts[i]->ltd_obd,
 488                                                  ev, data);
 489                         if (rc) {
 490                                 CERROR("%s: notify %s of %s failed %d\n",
 491                                        obd->obd_name,
 492                                        obd->obd_observer->obd_name,
 493                                        lov->lov_tgts[i]->ltd_obd->obd_name,
 494                                        rc);
 495                         }
 496                 }
 497                 obd_putref(obd);
 498         }
 499
 500         up_read(&lov->lov_notify_lock);
 501         return rc;
 502 }
 503
 504 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 505                           __u32 index, int gen, int active)
 506 {
 507         struct lov_obd *lov = &obd->u.lov;
 508         struct lov_tgt_desc *tgt;
 509         struct obd_device *tgt_obd;
 510         int rc;
 511
 512         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 513                uuidp->uuid, index, gen, active);
 514
 515         if (gen <= 0) {
 516                 CERROR("request to add OBD %s with invalid generation: %d\n",
 517                        uuidp->uuid, gen);
 518                 return -EINVAL;
 519         }
 520
 521         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 522                                         &obd->obd_uuid);
 523         if (!tgt_obd)
 524                 return -EINVAL;
 525
 526         mutex_lock(&lov->lov_lock);
 527
 528         if ((index < lov->lov_tgt_size) && lov->lov_tgts[index]) {
 529                 tgt = lov->lov_tgts[index];
 530                 CERROR("UUID %s already assigned at LOV target index %d\n",
 531                        obd_uuid2str(&tgt->ltd_uuid), index);
 532                 mutex_unlock(&lov->lov_lock);
 533                 return -EEXIST;
 534         }
 535
 536         if (index >= lov->lov_tgt_size) {
 537                 /* We need to reallocate the lov target array. */
 538                 struct lov_tgt_desc **newtgts, **old = NULL;
 539                 __u32 newsize, oldsize = 0;
 540
 541                 newsize = max_t(__u32, lov->lov_tgt_size, 2);
 542                 while (newsize < index + 1)
 543                         newsize <<= 1;
 544                 newtgts = kcalloc(newsize, sizeof(*newtgts), GFP_NOFS);
 545                 if (!newtgts) {
 546                         mutex_unlock(&lov->lov_lock);
 547                         return -ENOMEM;
 548                 }
 549
 550                 if (lov->lov_tgt_size) {
 551                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 552                                lov->lov_tgt_size);
 553                         old = lov->lov_tgts;
 554                         oldsize = lov->lov_tgt_size;
 555                 }
 556
 557                 lov->lov_tgts = newtgts;
 558                 lov->lov_tgt_size = newsize;
 559                 smp_rmb();
 560                 kfree(old);
 561
 562                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 563                        lov->lov_tgts, lov->lov_tgt_size);
 564         }
 565
 566         tgt = kzalloc(sizeof(*tgt), GFP_NOFS);
 567         if (!tgt) {
 568                 mutex_unlock(&lov->lov_lock);
 569                 return -ENOMEM;
 570         }
 571
 572         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 573         if (rc) {
 574                 mutex_unlock(&lov->lov_lock);
 575                 kfree(tgt);
 576                 return rc;
 577         }
 578
 579         tgt->ltd_uuid = *uuidp;
 580         tgt->ltd_obd = tgt_obd;
 581         /* XXX - add a sanity check on the generation number. */
 582         tgt->ltd_gen = gen;
 583         tgt->ltd_index = index;
 584         tgt->ltd_activate = active;
 585         lov->lov_tgts[index] = tgt;
 586         if (index >= lov->desc.ld_tgt_count)
 587                 lov->desc.ld_tgt_count = index + 1;
 588
 589         mutex_unlock(&lov->lov_lock);
 590
 591         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 592                index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 593
 594         rc = obd_notify(obd, tgt_obd, OBD_NOTIFY_CREATE, &index);
 595
 596         if (lov->lov_connects == 0) {
 597                 /* lov_connect hasn't been called yet. We'll do the
 598                  * lov_connect_obd on this target when that fn first runs,
 599                  * because we don't know the connect flags yet.
 600                  */
 601                 return 0;
 602         }
 603
 604         obd_getref(obd);
 605
 606         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 607         if (rc)
 608                 goto out;
 609
 610         /* connect to administrative disabled ost */
 611         if (!tgt->ltd_exp) {
 612                 rc = 0;
 613                 goto out;
 614         }
 615
 616         if (lov->lov_cache) {
 617                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 618                                         sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 619                                         sizeof(struct cl_client_cache),
 620                                         lov->lov_cache, NULL);
 621                 if (rc < 0)
 622                         goto out;
 623         }
 624
 625         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 626                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 627                         (void *)&index);
 628
 629 out:
 630         if (rc) {
 631                 CERROR("add failed (%d), deleting %s\n", rc,
 632                        obd_uuid2str(&tgt->ltd_uuid));
 633                 lov_del_target(obd, index, NULL, 0);
 634         }
 635         obd_putref(obd);
 636         return rc;
 637 }
 638
 639 /* Schedule a target for deletion */
 640 int lov_del_target(struct obd_device *obd, __u32 index,
 641                    struct obd_uuid *uuidp, int gen)
 642 {
 643         struct lov_obd *lov = &obd->u.lov;
 644         int count = lov->desc.ld_tgt_count;
 645         int rc = 0;
 646
 647         if (index >= count) {
 648                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 649                        index, count);
 650                 return -EINVAL;
 651         }
 652
 653         /* to make sure there's no ongoing lov_notify() now */
 654         down_write(&lov->lov_notify_lock);
 655         obd_getref(obd);
 656
 657         if (!lov->lov_tgts[index]) {
 658                 CERROR("LOV target at index %d is not setup.\n", index);
 659                 rc = -EINVAL;
 660                 goto out;
 661         }
 662
 663         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 664                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 665                        lov_uuid2str(lov, index), index,
 666                        obd_uuid2str(uuidp));
 667                 rc = -EINVAL;
 668                 goto out;
 669         }
 670
 671         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 672                lov_uuid2str(lov, index), index,
 673                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 674                lov->lov_tgts[index]->ltd_active);
 675
 676         lov->lov_tgts[index]->ltd_reap = 1;
 677         lov->lov_death_row++;
 678         /* we really delete it from obd_putref */
 679 out:
 680         obd_putref(obd);
 681         up_write(&lov->lov_notify_lock);
 682
 683         return rc;
 684 }
 685
 686 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 687 {
 688         struct obd_device *osc_obd;
 689
 690         LASSERT(tgt);
 691         LASSERT(tgt->ltd_reap);
 692
 693         osc_obd = class_exp2obd(tgt->ltd_exp);
 694
 695         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 696                tgt->ltd_uuid.uuid,
 697                osc_obd ? osc_obd->obd_name : "<no obd>");
 698
 699         if (tgt->ltd_exp)
 700                 lov_disconnect_obd(obd, tgt);
 701
 702         kfree(tgt);
 703
 704         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 705          * do it ourselves. And we can't do it from lov_cleanup,
 706          * because we just lost our only reference to it.
 707          */
 708         if (osc_obd)
 709                 class_manual_cleanup(osc_obd);
 710 }
 711
 712 void lov_fix_desc_stripe_size(__u64 *val)
 713 {
 714         if (*val < LOV_MIN_STRIPE_SIZE) {
 715                 if (*val != 0)
 716                         LCONSOLE_INFO("Increasing default stripe size to minimum %u\n",
 717                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 718                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 719         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 720                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 721                 LCONSOLE_WARN("Changing default stripe size to %llu (a multiple of %u)\n",
 722                               *val, LOV_MIN_STRIPE_SIZE);
 723         }
 724 }
 725
 726 void lov_fix_desc_stripe_count(__u32 *val)
 727 {
 728         if (*val == 0)
 729                 *val = 1;
 730 }
 731
 732 void lov_fix_desc_pattern(__u32 *val)
 733 {
 734         /* from lov_setstripe */
 735         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 736                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 737                 *val = 0;
 738         }
 739 }
 740
 741 void lov_fix_desc_qos_maxage(__u32 *val)
 742 {
 743         if (*val == 0)
 744                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 745 }
 746
 747 void lov_fix_desc(struct lov_desc *desc)
 748 {
 749         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 750         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 751         lov_fix_desc_pattern(&desc->ld_pattern);
 752         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 753 }
 754
 755 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 756 {
 757         struct lprocfs_static_vars lvars = { NULL };
 758         struct lov_desc *desc;
 759         struct lov_obd *lov = &obd->u.lov;
 760         int rc;
 761
 762         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 763                 CERROR("LOV setup requires a descriptor\n");
 764                 return -EINVAL;
 765         }
 766
 767         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 768
 769         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 770                 CERROR("descriptor size wrong: %d > %d\n",
 771                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 772                 return -EINVAL;
 773         }
 774
 775         if (desc->ld_magic != LOV_DESC_MAGIC) {
 776                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 777                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 778                                obd->obd_name, desc);
 779                         lustre_swab_lov_desc(desc);
 780                 } else {
 781                         CERROR("%s: Bad lov desc magic: %#x\n",
 782                                obd->obd_name, desc->ld_magic);
 783                         return -EINVAL;
 784                 }
 785         }
 786
 787         lov_fix_desc(desc);
 788
 789         desc->ld_active_tgt_count = 0;
 790         lov->desc = *desc;
 791         lov->lov_tgt_size = 0;
 792
 793         mutex_init(&lov->lov_lock);
 794         atomic_set(&lov->lov_refcount, 0);
 795         lov->lov_sp_me = LUSTRE_SP_CLI;
 796
 797         init_rwsem(&lov->lov_notify_lock);
 798
 799         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 800                                                    HASH_POOLS_MAX_BITS,
 801                                                    HASH_POOLS_BKT_BITS, 0,
 802                                                    CFS_HASH_MIN_THETA,
 803                                                    CFS_HASH_MAX_THETA,
 804                                                    &pool_hash_operations,
 805                                                    CFS_HASH_DEFAULT);
 806         INIT_LIST_HEAD(&lov->lov_pool_list);
 807         lov->lov_pool_count = 0;
 808         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 809         if (rc)
 810                 goto out;
 811
 812         lprocfs_lov_init_vars(&lvars);
 813         lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 814
 815         rc = ldebugfs_seq_create(obd->obd_debugfs_entry, "target_obd",
 816                                  0444, &lov_proc_target_fops, obd);
 817         if (rc)
 818                 CWARN("Error adding the target_obd file\n");
 819
 820         lov->lov_pool_debugfs_entry = ldebugfs_register("pools",
 821                                                      obd->obd_debugfs_entry,
 822                                                      NULL, NULL);
 823         return 0;
 824
 825 out:
 826         return rc;
 827 }
 828
 829 static int lov_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 830 {
 831         struct lov_obd *lov = &obd->u.lov;
 832
 833         switch (stage) {
 834         case OBD_CLEANUP_EARLY: {
 835                 int i;
 836
 837                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 838                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_active)
 839                                 continue;
 840                         obd_precleanup(class_exp2obd(lov->lov_tgts[i]->ltd_exp),
 841                                        OBD_CLEANUP_EARLY);
 842                 }
 843                 break;
 844         }
 845         default:
 846                 break;
 847         }
 848
 849         return 0;
 850 }
 851
 852 static int lov_cleanup(struct obd_device *obd)
 853 {
 854         struct lov_obd *lov = &obd->u.lov;
 855         struct list_head *pos, *tmp;
 856         struct pool_desc *pool;
 857
 858         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 859                 pool = list_entry(pos, struct pool_desc, pool_list);
 860                 /* free pool structs */
 861                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 862                 /* In the function below, .hs_keycmp resolves to
 863                  * pool_hashkey_keycmp()
 864                  */
 865                 /* coverity[overrun-buffer-val] */
 866                 lov_pool_del(obd, pool->pool_name);
 867         }
 868         cfs_hash_putref(lov->lov_pools_hash_body);
 869         lov_ost_pool_free(&lov->lov_packed);
 870
 871         lprocfs_obd_cleanup(obd);
 872         if (lov->lov_tgts) {
 873                 int i;
 874
 875                 obd_getref(obd);
 876                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 877                         if (!lov->lov_tgts[i])
 878                                 continue;
 879
 880                         /* Inactive targets may never have connected */
 881                         if (lov->lov_tgts[i]->ltd_active ||
 882                             atomic_read(&lov->lov_refcount))
 883                             /* We should never get here - these
 884                              * should have been removed in the
 885                              * disconnect.
 886                              */
 887                                 CERROR("lov tgt %d not cleaned! deathrow=%d, lovrc=%d\n",
 888                                        i, lov->lov_death_row,
 889                                        atomic_read(&lov->lov_refcount));
 890                         lov_del_target(obd, i, NULL, 0);
 891                 }
 892                 obd_putref(obd);
 893                 kfree(lov->lov_tgts);
 894                 lov->lov_tgt_size = 0;
 895         }
 896
 897         if (lov->lov_cache) {
 898                 cl_cache_decref(lov->lov_cache);
 899                 lov->lov_cache = NULL;
 900         }
 901
 902         return 0;
 903 }
 904
 905 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 906                             __u32 *indexp, int *genp)
 907 {
 908         struct obd_uuid obd_uuid;
 909         int cmd;
 910         int rc = 0;
 911
 912         switch (cmd = lcfg->lcfg_command) {
 913         case LCFG_LOV_ADD_OBD:
 914         case LCFG_LOV_ADD_INA:
 915         case LCFG_LOV_DEL_OBD: {
 916                 __u32 index;
 917                 int gen;
 918                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 919                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid)) {
 920                         rc = -EINVAL;
 921                         goto out;
 922                 }
 923
 924                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 925
 926                 rc = kstrtoint(lustre_cfg_buf(lcfg, 2), 10, indexp);
 927                 if (rc < 0)
 928                         goto out;
 929                 rc = kstrtoint(lustre_cfg_buf(lcfg, 3), 10, genp);
 930                 if (rc < 0)
 931                         goto out;
 932                 index = *indexp;
 933                 gen = *genp;
 934                 if (cmd == LCFG_LOV_ADD_OBD)
 935                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 936                 else if (cmd == LCFG_LOV_ADD_INA)
 937                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 938                 else
 939                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 940                 goto out;
 941         }
 942         case LCFG_PARAM: {
 943                 struct lprocfs_static_vars lvars = { NULL };
 944                 struct lov_desc *desc = &obd->u.lov.desc;
 945
 946                 if (!desc) {
 947                         rc = -EINVAL;
 948                         goto out;
 949                 }
 950
 951                 lprocfs_lov_init_vars(&lvars);
 952
 953                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 954                                               lcfg, obd);
 955                 if (rc > 0)
 956                         rc = 0;
 957                 goto out;
 958         }
 959         case LCFG_POOL_NEW:
 960         case LCFG_POOL_ADD:
 961         case LCFG_POOL_DEL:
 962         case LCFG_POOL_REM:
 963                 goto out;
 964
 965         default: {
 966                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 967                 rc = -EINVAL;
 968                 goto out;
 969         }
 970         }
 971 out:
 972         return rc;
 973 }
 974
 975 static int lov_recreate(struct obd_export *exp, struct obdo *src_oa,
 976                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
 977 {
 978         struct lov_stripe_md *obj_mdp, *lsm;
 979         struct lov_obd *lov = &exp->exp_obd->u.lov;
 980         unsigned ost_idx;
 981         int rc, i;
 982
 983         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 984                 src_oa->o_flags & OBD_FL_RECREATE_OBJS);
 985
 986         obj_mdp = kzalloc(sizeof(*obj_mdp), GFP_NOFS);
 987         if (!obj_mdp)
 988                 return -ENOMEM;
 989
 990         ost_idx = src_oa->o_nlink;
 991         lsm = *ea;
 992         if (!lsm) {
 993                 rc = -EINVAL;
 994                 goto out;
 995         }
 996         if (ost_idx >= lov->desc.ld_tgt_count ||
 997             !lov->lov_tgts[ost_idx]) {
 998                 rc = -EINVAL;
 999                 goto out;
1000         }
1001
1002         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1003                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1004
1005                 if (lov_oinfo_is_dummy(loi))
1006                         continue;
1007
1008                 if (loi->loi_ost_idx == ost_idx) {
1009                         if (ostid_id(&loi->loi_oi) != ostid_id(&src_oa->o_oi)) {
1010                                 rc = -EINVAL;
1011                                 goto out;
1012                         }
1013                         break;
1014                 }
1015         }
1016         if (i == lsm->lsm_stripe_count) {
1017                 rc = -EINVAL;
1018                 goto out;
1019         }
1020
1021         rc = obd_create(NULL, lov->lov_tgts[ost_idx]->ltd_exp,
1022                         src_oa, &obj_mdp, oti);
1023 out:
1024         kfree(obj_mdp);
1025         return rc;
1026 }
1027
1028 /* the LOV expects oa->o_id to be set to the LOV object id */
1029 static int lov_create(const struct lu_env *env, struct obd_export *exp,
1030                       struct obdo *src_oa, struct lov_stripe_md **ea,
1031                       struct obd_trans_info *oti)
1032 {
1033         struct lov_obd *lov;
1034         int rc = 0;
1035
1036         LASSERT(ea);
1037         if (!exp)
1038                 return -EINVAL;
1039
1040         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1041             src_oa->o_flags == OBD_FL_DELORPHAN) {
1042                 /* should be used with LOV anymore */
1043                 LBUG();
1044         }
1045
1046         lov = &exp->exp_obd->u.lov;
1047         if (!lov->desc.ld_active_tgt_count)
1048                 return -EIO;
1049
1050         obd_getref(exp->exp_obd);
1051         /* Recreate a specific object id at the given OST index */
1052         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1053             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
1054                 rc = lov_recreate(exp, src_oa, ea, oti);
1055         }
1056
1057         obd_putref(exp->exp_obd);
1058         return rc;
1059 }
1060
1061 #define ASSERT_LSM_MAGIC(lsmp)                                            \
1062 do {                                                                        \
1063         LASSERT((lsmp));                                                \
1064         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                    \
1065                  (lsmp)->lsm_magic == LOV_MAGIC_V3),                        \
1066                  "%p->lsm_magic=%x\n", (lsmp), (lsmp)->lsm_magic);            \
1067 } while (0)
1068
1069 static int lov_destroy(const struct lu_env *env, struct obd_export *exp,
1070                        struct obdo *oa, struct lov_stripe_md *lsm,
1071                        struct obd_trans_info *oti, struct obd_export *md_exp)
1072 {
1073         struct lov_request_set *set;
1074         struct obd_info oinfo;
1075         struct lov_request *req;
1076         struct lov_obd *lov;
1077         int rc = 0, err = 0;
1078
1079         ASSERT_LSM_MAGIC(lsm);
1080
1081         if (!exp || !exp->exp_obd)
1082                 return -ENODEV;
1083
1084         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1085                 LASSERT(oti);
1086                 LASSERT(oti->oti_logcookies);
1087         }
1088
1089         lov = &exp->exp_obd->u.lov;
1090         obd_getref(exp->exp_obd);
1091         rc = lov_prep_destroy_set(exp, &oinfo, oa, lsm, oti, &set);
1092         if (rc)
1093                 goto out;
1094
1095         list_for_each_entry(req, &set->set_list, rq_link) {
1096                 if (oa->o_valid & OBD_MD_FLCOOKIE)
1097                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1098
1099                 err = obd_destroy(env, lov->lov_tgts[req->rq_idx]->ltd_exp,
1100                                   req->rq_oi.oi_oa, NULL, oti, NULL);
1101                 err = lov_update_common_set(set, req, err);
1102                 if (err) {
1103                         CERROR("%s: destroying objid "DOSTID" subobj "
1104                                DOSTID" on OST idx %d: rc = %d\n",
1105                                exp->exp_obd->obd_name, POSTID(&oa->o_oi),
1106                                POSTID(&req->rq_oi.oi_oa->o_oi),
1107                                req->rq_idx, err);
1108                         if (!rc)
1109                                 rc = err;
1110                 }
1111         }
1112
1113         if (rc == 0)
1114                 rc = lsm_op_find(lsm->lsm_magic)->lsm_destroy(lsm, oa, md_exp);
1115
1116         err = lov_fini_destroy_set(set);
1117 out:
1118         obd_putref(exp->exp_obd);
1119         return rc ? rc : err;
1120 }
1121
1122 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset,
1123                                  void *data, int rc)
1124 {
1125         struct lov_request_set *lovset = (struct lov_request_set *)data;
1126         int err;
1127
1128         /* don't do attribute merge if this async op failed */
1129         if (rc)
1130                 atomic_set(&lovset->set_completes, 0);
1131         err = lov_fini_getattr_set(lovset);
1132         return rc ? rc : err;
1133 }
1134
1135 static int lov_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
1136                              struct ptlrpc_request_set *rqset)
1137 {
1138         struct lov_request_set *lovset;
1139         struct lov_obd *lov;
1140         struct lov_request *req;
1141         int rc = 0, err;
1142
1143         LASSERT(oinfo);
1144         ASSERT_LSM_MAGIC(oinfo->oi_md);
1145
1146         if (!exp || !exp->exp_obd)
1147                 return -ENODEV;
1148
1149         lov = &exp->exp_obd->u.lov;
1150
1151         rc = lov_prep_getattr_set(exp, oinfo, &lovset);
1152         if (rc)
1153                 return rc;
1154
1155         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1156                POSTID(&oinfo->oi_md->lsm_oi), oinfo->oi_md->lsm_stripe_count,
1157                oinfo->oi_md->lsm_stripe_size);
1158
1159         list_for_each_entry(req, &lovset->set_list, rq_link) {
1160                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1161                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1162                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1163                 rc = obd_getattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1164                                        &req->rq_oi, rqset);
1165                 if (rc) {
1166                         CERROR("%s: getattr objid "DOSTID" subobj"
1167                                DOSTID" on OST idx %d: rc = %d\n",
1168                                exp->exp_obd->obd_name,
1169                                POSTID(&oinfo->oi_oa->o_oi),
1170                                POSTID(&req->rq_oi.oi_oa->o_oi),
1171                                req->rq_idx, rc);
1172                         goto out;
1173                 }
1174         }
1175
1176         if (!list_empty(&rqset->set_requests)) {
1177                 LASSERT(rc == 0);
1178                 LASSERT(!rqset->set_interpret);
1179                 rqset->set_interpret = lov_getattr_interpret;
1180                 rqset->set_arg = (void *)lovset;
1181                 return rc;
1182         }
1183 out:
1184         if (rc)
1185                 atomic_set(&lovset->set_completes, 0);
1186         err = lov_fini_getattr_set(lovset);
1187         return rc ? rc : err;
1188 }
1189
1190 static int lov_setattr_interpret(struct ptlrpc_request_set *rqset,
1191                                  void *data, int rc)
1192 {
1193         struct lov_request_set *lovset = (struct lov_request_set *)data;
1194         int err;
1195
1196         if (rc)
1197                 atomic_set(&lovset->set_completes, 0);
1198         err = lov_fini_setattr_set(lovset);
1199         return rc ? rc : err;
1200 }
1201
1202 /* If @oti is given, the request goes from MDS and responses from OSTs are not
1203  * needed. Otherwise, a client is waiting for responses.
1204  */
1205 static int lov_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
1206                              struct obd_trans_info *oti,
1207                              struct ptlrpc_request_set *rqset)
1208 {
1209         struct lov_request_set *set;
1210         struct lov_request *req;
1211         struct lov_obd *lov;
1212         int rc = 0;
1213
1214         LASSERT(oinfo);
1215         ASSERT_LSM_MAGIC(oinfo->oi_md);
1216         if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE) {
1217                 LASSERT(oti);
1218                 LASSERT(oti->oti_logcookies);
1219         }
1220
1221         if (!exp || !exp->exp_obd)
1222                 return -ENODEV;
1223
1224         lov = &exp->exp_obd->u.lov;
1225         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1226         if (rc)
1227                 return rc;
1228
1229         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1230                POSTID(&oinfo->oi_md->lsm_oi),
1231                oinfo->oi_md->lsm_stripe_count,
1232                oinfo->oi_md->lsm_stripe_size);
1233
1234         list_for_each_entry(req, &set->set_list, rq_link) {
1235                 if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
1236                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1237
1238                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1239                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1240                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1241
1242                 rc = obd_setattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1243                                        &req->rq_oi, oti, rqset);
1244                 if (rc) {
1245                         CERROR("error: setattr objid "DOSTID" subobj"
1246                                DOSTID" on OST idx %d: rc = %d\n",
1247                                POSTID(&set->set_oi->oi_oa->o_oi),
1248                                POSTID(&req->rq_oi.oi_oa->o_oi),
1249                                req->rq_idx, rc);
1250                         break;
1251                 }
1252         }
1253
1254         /* If we are not waiting for responses on async requests, return. */
1255         if (rc || !rqset || list_empty(&rqset->set_requests)) {
1256                 int err;
1257
1258                 if (rc)
1259                         atomic_set(&set->set_completes, 0);
1260                 err = lov_fini_setattr_set(set);
1261                 return rc ? rc : err;
1262         }
1263
1264         LASSERT(!rqset->set_interpret);
1265         rqset->set_interpret = lov_setattr_interpret;
1266         rqset->set_arg = (void *)set;
1267
1268         return 0;
1269 }
1270
1271 /* find any ldlm lock of the inode in lov
1272  * return 0    not find
1273  *      1    find one
1274  *      < 0    error
1275  */
1276 static int lov_find_cbdata(struct obd_export *exp,
1277                            struct lov_stripe_md *lsm, ldlm_iterator_t it,
1278                            void *data)
1279 {
1280         struct lov_obd *lov;
1281         int rc = 0, i;
1282
1283         ASSERT_LSM_MAGIC(lsm);
1284
1285         if (!exp || !exp->exp_obd)
1286                 return -ENODEV;
1287
1288         lov = &exp->exp_obd->u.lov;
1289         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1290                 struct lov_stripe_md submd;
1291                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1292
1293                 if (lov_oinfo_is_dummy(loi))
1294                         continue;
1295
1296                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1297                         CDEBUG(D_HA, "lov idx %d NULL\n", loi->loi_ost_idx);
1298                         continue;
1299                 }
1300
1301                 submd.lsm_oi = loi->loi_oi;
1302                 submd.lsm_stripe_count = 0;
1303                 rc = obd_find_cbdata(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1304                                      &submd, it, data);
1305                 if (rc != 0)
1306                         return rc;
1307         }
1308         return rc;
1309 }
1310
1311 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1312 {
1313         struct lov_request_set *lovset = (struct lov_request_set *)data;
1314         int err;
1315
1316         if (rc)
1317                 atomic_set(&lovset->set_completes, 0);
1318
1319         err = lov_fini_statfs_set(lovset);
1320         return rc ? rc : err;
1321 }
1322
1323 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
1324                             __u64 max_age, struct ptlrpc_request_set *rqset)
1325 {
1326         struct obd_device      *obd = class_exp2obd(exp);
1327         struct lov_request_set *set;
1328         struct lov_request *req;
1329         struct lov_obd *lov;
1330         int rc = 0;
1331
1332         LASSERT(oinfo->oi_osfs);
1333
1334         lov = &obd->u.lov;
1335         rc = lov_prep_statfs_set(obd, oinfo, &set);
1336         if (rc)
1337                 return rc;
1338
1339         list_for_each_entry(req, &set->set_list, rq_link) {
1340                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1341                                       &req->rq_oi, max_age, rqset);
1342                 if (rc)
1343                         break;
1344         }
1345
1346         if (rc || list_empty(&rqset->set_requests)) {
1347                 int err;
1348
1349                 if (rc)
1350                         atomic_set(&set->set_completes, 0);
1351                 err = lov_fini_statfs_set(set);
1352                 return rc ? rc : err;
1353         }
1354
1355         LASSERT(!rqset->set_interpret);
1356         rqset->set_interpret = lov_statfs_interpret;
1357         rqset->set_arg = (void *)set;
1358         return 0;
1359 }
1360
1361 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1362                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1363 {
1364         struct ptlrpc_request_set *set = NULL;
1365         struct obd_info oinfo = { };
1366         int rc = 0;
1367
1368         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1369          * statfs requests
1370          */
1371         set = ptlrpc_prep_set();
1372         if (!set)
1373                 return -ENOMEM;
1374
1375         oinfo.oi_osfs = osfs;
1376         oinfo.oi_flags = flags;
1377         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1378         if (rc == 0)
1379                 rc = ptlrpc_set_wait(set);
1380         ptlrpc_set_destroy(set);
1381
1382         return rc;
1383 }
1384
1385 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1386                          void *karg, void __user *uarg)
1387 {
1388         struct obd_device *obddev = class_exp2obd(exp);
1389         struct lov_obd *lov = &obddev->u.lov;
1390         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1391         struct obd_uuid *uuidp;
1392
1393         switch (cmd) {
1394         case IOC_OBD_STATFS: {
1395                 struct obd_ioctl_data *data = karg;
1396                 struct obd_device *osc_obd;
1397                 struct obd_statfs stat_buf = {0};
1398                 __u32 index;
1399                 __u32 flags;
1400
1401                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1402                 if (index >= count)
1403                         return -ENODEV;
1404
1405                 if (!lov->lov_tgts[index])
1406                         /* Try again with the next index */
1407                         return -EAGAIN;
1408                 if (!lov->lov_tgts[index]->ltd_active)
1409                         return -ENODATA;
1410
1411                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1412                 if (!osc_obd)
1413                         return -EINVAL;
1414
1415                 /* copy UUID */
1416                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1417                                  min((int)data->ioc_plen2,
1418                                      (int)sizeof(struct obd_uuid))))
1419                         return -EFAULT;
1420
1421                 memcpy(&flags, data->ioc_inlbuf1, sizeof(__u32));
1422                 flags = flags & LL_STATFS_NODELAY ? OBD_STATFS_NODELAY : 0;
1423
1424                 /* got statfs data */
1425                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1426                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1427                                 flags);
1428                 if (rc)
1429                         return rc;
1430                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1431                                  min((int)data->ioc_plen1,
1432                                      (int)sizeof(stat_buf))))
1433                         return -EFAULT;
1434                 break;
1435         }
1436         case OBD_IOC_LOV_GET_CONFIG: {
1437                 struct obd_ioctl_data *data;
1438                 struct lov_desc *desc;
1439                 char *buf = NULL;
1440                 __u32 *genp;
1441
1442                 len = 0;
1443                 if (obd_ioctl_getdata(&buf, &len, uarg))
1444                         return -EINVAL;
1445
1446                 data = (struct obd_ioctl_data *)buf;
1447
1448                 if (sizeof(*desc) > data->ioc_inllen1) {
1449                         obd_ioctl_freedata(buf, len);
1450                         return -EINVAL;
1451                 }
1452
1453                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1454                         obd_ioctl_freedata(buf, len);
1455                         return -EINVAL;
1456                 }
1457
1458                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1459                         obd_ioctl_freedata(buf, len);
1460                         return -EINVAL;
1461                 }
1462
1463                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1464                 memcpy(desc, &lov->desc, sizeof(*desc));
1465
1466                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1467                 genp = (__u32 *)data->ioc_inlbuf3;
1468                 /* the uuid will be empty for deleted OSTs */
1469                 for (i = 0; i < count; i++, uuidp++, genp++) {
1470                         if (!lov->lov_tgts[i])
1471                                 continue;
1472                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1473                         *genp = lov->lov_tgts[i]->ltd_gen;
1474                 }
1475
1476                 if (copy_to_user(uarg, buf, len))
1477                         rc = -EFAULT;
1478                 obd_ioctl_freedata(buf, len);
1479                 break;
1480         }
1481         case LL_IOC_LOV_GETSTRIPE:
1482                 rc = lov_getstripe(exp, karg, uarg);
1483                 break;
1484         case OBD_IOC_QUOTACTL: {
1485                 struct if_quotactl *qctl = karg;
1486                 struct lov_tgt_desc *tgt = NULL;
1487                 struct obd_quotactl *oqctl;
1488
1489                 if (qctl->qc_valid == QC_OSTIDX) {
1490                         if (count <= qctl->qc_idx)
1491                                 return -EINVAL;
1492
1493                         tgt = lov->lov_tgts[qctl->qc_idx];
1494                         if (!tgt || !tgt->ltd_exp)
1495                                 return -EINVAL;
1496                 } else if (qctl->qc_valid == QC_UUID) {
1497                         for (i = 0; i < count; i++) {
1498                                 tgt = lov->lov_tgts[i];
1499                                 if (!tgt ||
1500                                     !obd_uuid_equals(&tgt->ltd_uuid,
1501                                                      &qctl->obd_uuid))
1502                                         continue;
1503
1504                                 if (!tgt->ltd_exp)
1505                                         return -EINVAL;
1506
1507                                 break;
1508                         }
1509                 } else {
1510                         return -EINVAL;
1511                 }
1512
1513                 if (i >= count)
1514                         return -EAGAIN;
1515
1516                 LASSERT(tgt && tgt->ltd_exp);
1517                 oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
1518                 if (!oqctl)
1519                         return -ENOMEM;
1520
1521                 QCTL_COPY(oqctl, qctl);
1522                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1523                 if (rc == 0) {
1524                         QCTL_COPY(qctl, oqctl);
1525                         qctl->qc_valid = QC_OSTIDX;
1526                         qctl->obd_uuid = tgt->ltd_uuid;
1527                 }
1528                 kfree(oqctl);
1529                 break;
1530         }
1531         default: {
1532                 int set = 0;
1533
1534                 if (count == 0)
1535                         return -ENOTTY;
1536
1537                 for (i = 0; i < count; i++) {
1538                         int err;
1539                         struct obd_device *osc_obd;
1540
1541                         /* OST was disconnected */
1542                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1543                                 continue;
1544
1545                         /* ll_umount_begin() sets force flag but for lov, not
1546                          * osc. Let's pass it through
1547                          */
1548                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1549                         osc_obd->obd_force = obddev->obd_force;
1550                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1551                                             len, karg, uarg);
1552                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK)
1553                                 return err;
1554                         if (err) {
1555                                 if (lov->lov_tgts[i]->ltd_active) {
1556                                         CDEBUG(err == -ENOTTY ?
1557                                                D_IOCTL : D_WARNING,
1558                                                "iocontrol OSC %s on OST idx %d cmd %x: err = %d\n",
1559                                                lov_uuid2str(lov, i),
1560                                                i, cmd, err);
1561                                         if (!rc)
1562                                                 rc = err;
1563                                 }
1564                         } else {
1565                                 set = 1;
1566                         }
1567                 }
1568                 if (!set && !rc)
1569                         rc = -EIO;
1570         }
1571         }
1572
1573         return rc;
1574 }
1575
1576 #define FIEMAP_BUFFER_SIZE 4096
1577
1578 /**
1579  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1580  * call. The local end offset and the device are sent in the first
1581  * fm_extent. This function calculates the stripe number from the index.
1582  * This function returns a stripe_no on which mapping is to be restarted.
1583  *
1584  * This function returns fm_end_offset which is the in-OST offset at which
1585  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1586  * will re-calculate proper offset in next stripe.
1587  * Note that the first extent is passed to lov_get_info via the value field.
1588  *
1589  * \param fiemap fiemap request header
1590  * \param lsm striping information for the file
1591  * \param fm_start logical start of mapping
1592  * \param fm_end logical end of mapping
1593  * \param start_stripe starting stripe will be returned in this
1594  */
1595 static u64 fiemap_calc_fm_end_offset(struct ll_user_fiemap *fiemap,
1596                                      struct lov_stripe_md *lsm, u64 fm_start,
1597                                      u64 fm_end, int *start_stripe)
1598 {
1599         u64 local_end = fiemap->fm_extents[0].fe_logical;
1600         u64 lun_start, lun_end;
1601         u64 fm_end_offset;
1602         int stripe_no = -1, i;
1603
1604         if (fiemap->fm_extent_count == 0 ||
1605             fiemap->fm_extents[0].fe_logical == 0)
1606                 return 0;
1607
1608         /* Find out stripe_no from ost_index saved in the fe_device */
1609         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1610                 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
1611
1612                 if (lov_oinfo_is_dummy(oinfo))
1613                         continue;
1614
1615                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1616                         stripe_no = i;
1617                         break;
1618                 }
1619         }
1620         if (stripe_no == -1)
1621                 return -EINVAL;
1622
1623         /* If we have finished mapping on previous device, shift logical
1624          * offset to start of next device
1625          */
1626         if ((lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
1627                                    &lun_start, &lun_end)) != 0 &&
1628                                    local_end < lun_end) {
1629                 fm_end_offset = local_end;
1630                 *start_stripe = stripe_no;
1631         } else {
1632                 /* This is a special value to indicate that caller should
1633                  * calculate offset in next stripe.
1634                  */
1635                 fm_end_offset = 0;
1636                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
1637         }
1638
1639         return fm_end_offset;
1640 }
1641
1642 /**
1643  * We calculate on which OST the mapping will end. If the length of mapping
1644  * is greater than (stripe_size * stripe_count) then the last_stripe will
1645  * will be one just before start_stripe. Else we check if the mapping
1646  * intersects each OST and find last_stripe.
1647  * This function returns the last_stripe and also sets the stripe_count
1648  * over which the mapping is spread
1649  *
1650  * \param lsm striping information for the file
1651  * \param fm_start logical start of mapping
1652  * \param fm_end logical end of mapping
1653  * \param start_stripe starting stripe of the mapping
1654  * \param stripe_count the number of stripes across which to map is returned
1655  *
1656  * \retval last_stripe return the last stripe of the mapping
1657  */
1658 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, u64 fm_start,
1659                                    u64 fm_end, int start_stripe,
1660                                    int *stripe_count)
1661 {
1662         int last_stripe;
1663         u64 obd_start, obd_end;
1664         int i, j;
1665
1666         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
1667                 last_stripe = start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
1668                                                               start_stripe - 1;
1669                 *stripe_count = lsm->lsm_stripe_count;
1670         } else {
1671                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
1672                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
1673                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
1674                                                    &obd_start, &obd_end)) == 0)
1675                                 break;
1676                 }
1677                 *stripe_count = j;
1678                 last_stripe = (start_stripe + j - 1) % lsm->lsm_stripe_count;
1679         }
1680
1681         return last_stripe;
1682 }
1683
1684 /**
1685  * Set fe_device and copy extents from local buffer into main return buffer.
1686  *
1687  * \param fiemap fiemap request header
1688  * \param lcl_fm_ext array of local fiemap extents to be copied
1689  * \param ost_index OST index to be written into the fm_device field for each
1690                     extent
1691  * \param ext_count number of extents to be copied
1692  * \param current_extent where to start copying in main extent array
1693  */
1694 static void fiemap_prepare_and_copy_exts(struct ll_user_fiemap *fiemap,
1695                                          struct ll_fiemap_extent *lcl_fm_ext,
1696                                          int ost_index, unsigned int ext_count,
1697                                          int current_extent)
1698 {
1699         char *to;
1700         int ext;
1701
1702         for (ext = 0; ext < ext_count; ext++) {
1703                 lcl_fm_ext[ext].fe_device = ost_index;
1704                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1705         }
1706
1707         /* Copy fm_extent's from fm_local to return buffer */
1708         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1709         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct ll_fiemap_extent));
1710 }
1711
1712 /**
1713  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1714  * This also handles the restarting of FIEMAP calls in case mapping overflows
1715  * the available number of extents in single call.
1716  */
1717 static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
1718                       __u32 *vallen, void *val, struct lov_stripe_md *lsm)
1719 {
1720         struct ll_fiemap_info_key *fm_key = key;
1721         struct ll_user_fiemap *fiemap = val;
1722         struct ll_user_fiemap *fm_local = NULL;
1723         struct ll_fiemap_extent *lcl_fm_ext;
1724         int count_local;
1725         unsigned int get_num_extents = 0;
1726         int ost_index = 0, actual_start_stripe, start_stripe;
1727         u64 fm_start, fm_end, fm_length, fm_end_offset;
1728         u64 curr_loc;
1729         int current_extent = 0, rc = 0, i;
1730         int ost_eof = 0; /* EOF for object */
1731         int ost_done = 0; /* done with required mapping for this OST? */
1732         int last_stripe;
1733         int cur_stripe = 0, cur_stripe_wrap = 0, stripe_count;
1734         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1735
1736         if (!lsm_has_objects(lsm)) {
1737                 if (lsm && lsm_is_released(lsm) && (fm_key->fiemap.fm_start <
1738                     fm_key->oa.o_size)) {
1739                         /*
1740                          * released file, return a minimal FIEMAP if
1741                          * request fits in file-size.
1742                          */
1743                         fiemap->fm_mapped_extents = 1;
1744                         fiemap->fm_extents[0].fe_logical =
1745                                         fm_key->fiemap.fm_start;
1746                         if (fm_key->fiemap.fm_start + fm_key->fiemap.fm_length <
1747                             fm_key->oa.o_size) {
1748                                 fiemap->fm_extents[0].fe_length =
1749                                         fm_key->fiemap.fm_length;
1750                         } else {
1751                                 fiemap->fm_extents[0].fe_length =
1752                                         fm_key->oa.o_size - fm_key->fiemap.fm_start;
1753                                 fiemap->fm_extents[0].fe_flags |=
1754                                                 (FIEMAP_EXTENT_UNKNOWN |
1755                                                  FIEMAP_EXTENT_LAST);
1756                         }
1757                 }
1758                 rc = 0;
1759                 goto out;
1760         }
1761
1762         if (fiemap_count_to_size(fm_key->fiemap.fm_extent_count) < buffer_size)
1763                 buffer_size = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
1764
1765         fm_local = libcfs_kvzalloc(buffer_size, GFP_NOFS);
1766         if (!fm_local) {
1767                 rc = -ENOMEM;
1768                 goto out;
1769         }
1770         lcl_fm_ext = &fm_local->fm_extents[0];
1771
1772         count_local = fiemap_size_to_count(buffer_size);
1773
1774         memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
1775         fm_start = fiemap->fm_start;
1776         fm_length = fiemap->fm_length;
1777         /* Calculate start stripe, last stripe and length of mapping */
1778         start_stripe = lov_stripe_number(lsm, fm_start);
1779         actual_start_stripe = start_stripe;
1780         fm_end = (fm_length == ~0ULL ? fm_key->oa.o_size :
1781                                                 fm_start + fm_length - 1);
1782         /* If fm_length != ~0ULL but fm_start+fm_length-1 exceeds file size */
1783         if (fm_end > fm_key->oa.o_size)
1784                 fm_end = fm_key->oa.o_size;
1785
1786         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
1787                                               actual_start_stripe,
1788                                               &stripe_count);
1789
1790         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start,
1791                                                   fm_end, &start_stripe);
1792         if (fm_end_offset == -EINVAL) {
1793                 rc = -EINVAL;
1794                 goto out;
1795         }
1796
1797         if (fiemap_count_to_size(fiemap->fm_extent_count) > *vallen)
1798                 fiemap->fm_extent_count = fiemap_size_to_count(*vallen);
1799         if (fiemap->fm_extent_count == 0) {
1800                 get_num_extents = 1;
1801                 count_local = 0;
1802         }
1803         /* Check each stripe */
1804         for (cur_stripe = start_stripe, i = 0; i < stripe_count;
1805              i++, cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
1806                 u64 req_fm_len; /* Stores length of required mapping */
1807                 u64 len_mapped_single_call;
1808                 u64 lun_start, lun_end, obd_object_end;
1809                 unsigned int ext_count;
1810
1811                 cur_stripe_wrap = cur_stripe;
1812
1813                 /* Find out range of mapping on this stripe */
1814                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
1815                                            &lun_start, &obd_object_end)) == 0)
1816                         continue;
1817
1818                 if (lov_oinfo_is_dummy(lsm->lsm_oinfo[cur_stripe])) {
1819                         rc = -EIO;
1820                         goto out;
1821                 }
1822
1823                 /* If this is a continuation FIEMAP call and we are on
1824                  * starting stripe then lun_start needs to be set to
1825                  * fm_end_offset
1826                  */
1827                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
1828                         lun_start = fm_end_offset;
1829
1830                 if (fm_length != ~0ULL) {
1831                         /* Handle fm_start + fm_length overflow */
1832                         if (fm_start + fm_length < fm_start)
1833                                 fm_length = ~0ULL - fm_start;
1834                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
1835                                                      cur_stripe);
1836                 } else {
1837                         lun_end = ~0ULL;
1838                 }
1839
1840                 if (lun_start == lun_end)
1841                         continue;
1842
1843                 req_fm_len = obd_object_end - lun_start;
1844                 fm_local->fm_length = 0;
1845                 len_mapped_single_call = 0;
1846
1847                 /* If the output buffer is very large and the objects have many
1848                  * extents we may need to loop on a single OST repeatedly
1849                  */
1850                 ost_eof = 0;
1851                 ost_done = 0;
1852                 do {
1853                         if (get_num_extents == 0) {
1854                                 /* Don't get too many extents. */
1855                                 if (current_extent + count_local >
1856                                     fiemap->fm_extent_count)
1857                                         count_local = fiemap->fm_extent_count -
1858                                                                  current_extent;
1859                         }
1860
1861                         lun_start += len_mapped_single_call;
1862                         fm_local->fm_length = req_fm_len - len_mapped_single_call;
1863                         req_fm_len = fm_local->fm_length;
1864                         fm_local->fm_extent_count = count_local;
1865                         fm_local->fm_mapped_extents = 0;
1866                         fm_local->fm_flags = fiemap->fm_flags;
1867
1868                         fm_key->oa.o_oi = lsm->lsm_oinfo[cur_stripe]->loi_oi;
1869                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
1870
1871                         if (ost_index < 0 ||
1872                             ost_index >= lov->desc.ld_tgt_count) {
1873                                 rc = -EINVAL;
1874                                 goto out;
1875                         }
1876
1877                         /* If OST is inactive, return extent with UNKNOWN flag */
1878                         if (!lov->lov_tgts[ost_index]->ltd_active) {
1879                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
1880                                 fm_local->fm_mapped_extents = 1;
1881
1882                                 lcl_fm_ext[0].fe_logical = lun_start;
1883                                 lcl_fm_ext[0].fe_length = obd_object_end -
1884                                                                       lun_start;
1885                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1886
1887                                 goto inactive_tgt;
1888                         }
1889
1890                         fm_local->fm_start = lun_start;
1891                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1892                         memcpy(&fm_key->fiemap, fm_local, sizeof(*fm_local));
1893                         *vallen = fiemap_count_to_size(fm_local->fm_extent_count);
1894                         rc = obd_get_info(NULL,
1895                                           lov->lov_tgts[ost_index]->ltd_exp,
1896                                           keylen, key, vallen, fm_local, lsm);
1897                         if (rc != 0)
1898                                 goto out;
1899
1900 inactive_tgt:
1901                         ext_count = fm_local->fm_mapped_extents;
1902                         if (ext_count == 0) {
1903                                 ost_done = 1;
1904                                 /* If last stripe has hole at the end,
1905                                  * then we need to return
1906                                  */
1907                                 if (cur_stripe_wrap == last_stripe) {
1908                                         fiemap->fm_mapped_extents = 0;
1909                                         goto finish;
1910                                 }
1911                                 break;
1912                         }
1913
1914                         /* If we just need num of extents then go to next device */
1915                         if (get_num_extents) {
1916                                 current_extent += ext_count;
1917                                 break;
1918                         }
1919
1920                         len_mapped_single_call =
1921                                 lcl_fm_ext[ext_count - 1].fe_logical -
1922                                 lun_start + lcl_fm_ext[ext_count - 1].fe_length;
1923
1924                         /* Have we finished mapping on this device? */
1925                         if (req_fm_len <= len_mapped_single_call)
1926                                 ost_done = 1;
1927
1928                         /* Clear the EXTENT_LAST flag which can be present on
1929                          * last extent
1930                          */
1931                         if (lcl_fm_ext[ext_count - 1].fe_flags &
1932                             FIEMAP_EXTENT_LAST)
1933                                 lcl_fm_ext[ext_count - 1].fe_flags &=
1934                                                             ~FIEMAP_EXTENT_LAST;
1935
1936                         curr_loc = lov_stripe_size(lsm,
1937                                         lcl_fm_ext[ext_count - 1].fe_logical +
1938                                         lcl_fm_ext[ext_count - 1].fe_length,
1939                                         cur_stripe);
1940                         if (curr_loc >= fm_key->oa.o_size)
1941                                 ost_eof = 1;
1942
1943                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
1944                                                      ost_index, ext_count,
1945                                                      current_extent);
1946
1947                         current_extent += ext_count;
1948
1949                         /* Ran out of available extents? */
1950                         if (current_extent >= fiemap->fm_extent_count)
1951                                 goto finish;
1952                 } while (ost_done == 0 && ost_eof == 0);
1953
1954                 if (cur_stripe_wrap == last_stripe)
1955                         goto finish;
1956         }
1957
1958 finish:
1959         /* Indicate that we are returning device offsets unless file just has
1960          * single stripe
1961          */
1962         if (lsm->lsm_stripe_count > 1)
1963                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1964
1965         if (get_num_extents)
1966                 goto skip_last_device_calc;
1967
1968         /* Check if we have reached the last stripe and whether mapping for that
1969          * stripe is done.
1970          */
1971         if (cur_stripe_wrap == last_stripe) {
1972                 if (ost_done || ost_eof)
1973                         fiemap->fm_extents[current_extent - 1].fe_flags |=
1974                                                              FIEMAP_EXTENT_LAST;
1975         }
1976
1977 skip_last_device_calc:
1978         fiemap->fm_mapped_extents = current_extent;
1979
1980 out:
1981         kvfree(fm_local);
1982         return rc;
1983 }
1984
1985 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1986                         __u32 keylen, void *key, __u32 *vallen, void *val,
1987                         struct lov_stripe_md *lsm)
1988 {
1989         struct obd_device *obddev = class_exp2obd(exp);
1990         struct lov_obd *lov = &obddev->u.lov;
1991         int i, rc;
1992
1993         if (!vallen || !val)
1994                 return -EFAULT;
1995
1996         obd_getref(obddev);
1997
1998         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
1999                 struct {
2000                         char name[16];
2001                         struct ldlm_lock *lock;
2002                 } *data = key;
2003                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
2004                 struct lov_oinfo *loi;
2005                 __u32 *stripe = val;
2006
2007                 if (*vallen < sizeof(*stripe)) {
2008                         rc = -EFAULT;
2009                         goto out;
2010                 }
2011                 *vallen = sizeof(*stripe);
2012
2013                 /* XXX This is another one of those bits that will need to
2014                  * change if we ever actually support nested LOVs.  It uses
2015                  * the lock's export to find out which stripe it is.
2016                  */
2017                 /* XXX - it's assumed all the locks for deleted OSTs have
2018                  * been cancelled. Also, the export for deleted OSTs will
2019                  * be NULL and won't match the lock's export.
2020                  */
2021                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
2022                         loi = lsm->lsm_oinfo[i];
2023                         if (lov_oinfo_is_dummy(loi))
2024                                 continue;
2025
2026                         if (!lov->lov_tgts[loi->loi_ost_idx])
2027                                 continue;
2028                         if (lov->lov_tgts[loi->loi_ost_idx]->ltd_exp ==
2029                             data->lock->l_conn_export &&
2030                             ostid_res_name_eq(&loi->loi_oi, res_id)) {
2031                                 *stripe = i;
2032                                 rc = 0;
2033                                 goto out;
2034                         }
2035                 }
2036                 LDLM_ERROR(data->lock, "lock on inode without such object");
2037                 dump_lsm(D_ERROR, lsm);
2038                 rc = -ENXIO;
2039                 goto out;
2040         } else if (KEY_IS(KEY_LAST_ID)) {
2041                 struct obd_id_info *info = val;
2042                 __u32 size = sizeof(u64);
2043                 struct lov_tgt_desc *tgt;
2044
2045                 LASSERT(*vallen == sizeof(struct obd_id_info));
2046                 tgt = lov->lov_tgts[info->idx];
2047
2048                 if (!tgt || !tgt->ltd_active) {
2049                         rc = -ESRCH;
2050                         goto out;
2051                 }
2052
2053                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
2054                                   &size, info->data, NULL);
2055                 rc = 0;
2056                 goto out;
2057         } else if (KEY_IS(KEY_LOVDESC)) {
2058                 struct lov_desc *desc_ret = val;
2059                 *desc_ret = lov->desc;
2060
2061                 rc = 0;
2062                 goto out;
2063         } else if (KEY_IS(KEY_FIEMAP)) {
2064                 rc = lov_fiemap(lov, keylen, key, vallen, val, lsm);
2065                 goto out;
2066         } else if (KEY_IS(KEY_CONNECT_FLAG)) {
2067                 struct lov_tgt_desc *tgt;
2068                 __u64 ost_idx = *((__u64 *)val);
2069
2070                 LASSERT(*vallen == sizeof(__u64));
2071                 LASSERT(ost_idx < lov->desc.ld_tgt_count);
2072                 tgt = lov->lov_tgts[ost_idx];
2073
2074                 if (!tgt || !tgt->ltd_exp) {
2075                         rc = -ESRCH;
2076                         goto out;
2077                 }
2078
2079                 *((__u64 *)val) = exp_connect_flags(tgt->ltd_exp);
2080                 rc = 0;
2081                 goto out;
2082         } else if (KEY_IS(KEY_TGT_COUNT)) {
2083                 *((int *)val) = lov->desc.ld_tgt_count;
2084                 rc = 0;
2085                 goto out;
2086         }
2087
2088         rc = -EINVAL;
2089
2090 out:
2091         obd_putref(obddev);
2092         return rc;
2093 }
2094
2095 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
2096                               u32 keylen, void *key, u32 vallen,
2097                               void *val, struct ptlrpc_request_set *set)
2098 {
2099         struct obd_device *obddev = class_exp2obd(exp);
2100         struct lov_obd *lov = &obddev->u.lov;
2101         u32 count;
2102         int i, rc = 0, err;
2103         struct lov_tgt_desc *tgt;
2104         unsigned int incr = 0, check_uuid = 0, do_inactive = 0, no_set = 0;
2105         unsigned int next_id = 0, mds_con = 0;
2106
2107         if (!set) {
2108                 no_set = 1;
2109                 set = ptlrpc_prep_set();
2110                 if (!set)
2111                         return -ENOMEM;
2112         }
2113
2114         obd_getref(obddev);
2115         count = lov->desc.ld_tgt_count;
2116
2117         if (KEY_IS(KEY_NEXT_ID)) {
2118                 count = vallen / sizeof(struct obd_id_info);
2119                 vallen = sizeof(u64);
2120                 incr = sizeof(struct obd_id_info);
2121                 do_inactive = 1;
2122                 next_id = 1;
2123         } else if (KEY_IS(KEY_CHECKSUM)) {
2124                 do_inactive = 1;
2125         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2126                 /* use defaults:  do_inactive = incr = 0; */
2127         } else if (KEY_IS(KEY_MDS_CONN)) {
2128                 mds_con = 1;
2129         } else if (KEY_IS(KEY_CACHE_SET)) {
2130                 LASSERT(!lov->lov_cache);
2131                 lov->lov_cache = val;
2132                 do_inactive = 1;
2133                 cl_cache_incref(lov->lov_cache);
2134         }
2135
2136         for (i = 0; i < count; i++, val = (char *)val + incr) {
2137                 if (next_id)
2138                         tgt = lov->lov_tgts[((struct obd_id_info *)val)->idx];
2139                 else
2140                         tgt = lov->lov_tgts[i];
2141                 /* OST was disconnected */
2142                 if (!tgt || !tgt->ltd_exp)
2143                         continue;
2144
2145                 /* OST is inactive and we don't want inactive OSCs */
2146                 if (!tgt->ltd_active && !do_inactive)
2147                         continue;
2148
2149                 if (mds_con) {
2150                         struct mds_group_info *mgi;
2151
2152                         LASSERT(vallen == sizeof(*mgi));
2153                         mgi = (struct mds_group_info *)val;
2154
2155                         /* Only want a specific OSC */
2156                         if (mgi->uuid && !obd_uuid_equals(mgi->uuid,
2157                                                           &tgt->ltd_uuid))
2158                                 continue;
2159
2160                         err = obd_set_info_async(env, tgt->ltd_exp,
2161                                                  keylen, key, sizeof(int),
2162                                                  &mgi->group, set);
2163                 } else if (next_id) {
2164                         err = obd_set_info_async(env, tgt->ltd_exp,
2165                                          keylen, key, vallen,
2166                                          ((struct obd_id_info *)val)->data, set);
2167                 } else {
2168                         /* Only want a specific OSC */
2169                         if (check_uuid &&
2170                             !obd_uuid_equals(val, &tgt->ltd_uuid))
2171                                 continue;
2172
2173                         err = obd_set_info_async(env, tgt->ltd_exp,
2174                                                  keylen, key, vallen, val, set);
2175                 }
2176
2177                 if (!rc)
2178                         rc = err;
2179         }
2180
2181         obd_putref(obddev);
2182         if (no_set) {
2183                 err = ptlrpc_set_wait(set);
2184                 if (!rc)
2185                         rc = err;
2186                 ptlrpc_set_destroy(set);
2187         }
2188         return rc;
2189 }
2190
2191 void lov_stripe_lock(struct lov_stripe_md *md)
2192                 __acquires(&md->lsm_lock)
2193 {
2194         LASSERT(md->lsm_lock_owner != current_pid());
2195         spin_lock(&md->lsm_lock);
2196         LASSERT(md->lsm_lock_owner == 0);
2197         md->lsm_lock_owner = current_pid();
2198 }
2199
2200 void lov_stripe_unlock(struct lov_stripe_md *md)
2201                 __releases(&md->lsm_lock)
2202 {
2203         LASSERT(md->lsm_lock_owner == current_pid());
2204         md->lsm_lock_owner = 0;
2205         spin_unlock(&md->lsm_lock);
2206 }
2207
2208 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
2209                         struct obd_quotactl *oqctl)
2210 {
2211         struct lov_obd      *lov = &obd->u.lov;
2212         struct lov_tgt_desc *tgt;
2213         __u64           curspace = 0;
2214         __u64           bhardlimit = 0;
2215         int               i, rc = 0;
2216
2217         if (oqctl->qc_cmd != LUSTRE_Q_QUOTAON &&
2218             oqctl->qc_cmd != LUSTRE_Q_QUOTAOFF &&
2219             oqctl->qc_cmd != Q_GETOQUOTA &&
2220             oqctl->qc_cmd != Q_INITQUOTA &&
2221             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA &&
2222             oqctl->qc_cmd != Q_FINVALIDATE) {
2223                 CERROR("bad quota opc %x for lov obd\n", oqctl->qc_cmd);
2224                 return -EFAULT;
2225         }
2226
2227         /* for lov tgt */
2228         obd_getref(obd);
2229         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2230                 int err;
2231
2232                 tgt = lov->lov_tgts[i];
2233
2234                 if (!tgt)
2235                         continue;
2236
2237                 if (!tgt->ltd_active || tgt->ltd_reap) {
2238                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
2239                             lov->lov_tgts[i]->ltd_activate) {
2240                                 rc = -EREMOTEIO;
2241                                 CERROR("ost %d is inactive\n", i);
2242                         } else {
2243                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
2244                         }
2245                         continue;
2246                 }
2247
2248                 err = obd_quotactl(tgt->ltd_exp, oqctl);
2249                 if (err) {
2250                         if (tgt->ltd_active && !rc)
2251                                 rc = err;
2252                         continue;
2253                 }
2254
2255                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
2256                         curspace += oqctl->qc_dqblk.dqb_curspace;
2257                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
2258                 }
2259         }
2260         obd_putref(obd);
2261
2262         if (oqctl->qc_cmd == Q_GETOQUOTA) {
2263                 oqctl->qc_dqblk.dqb_curspace = curspace;
2264                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
2265         }
2266         return rc;
2267 }
2268
2269 static int lov_quotacheck(struct obd_device *obd, struct obd_export *exp,
2270                           struct obd_quotactl *oqctl)
2271 {
2272         struct lov_obd *lov = &obd->u.lov;
2273         int          i, rc = 0;
2274
2275         obd_getref(obd);
2276
2277         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2278                 if (!lov->lov_tgts[i])
2279                         continue;
2280
2281                 /* Skip quota check on the administratively disabled OSTs. */
2282                 if (!lov->lov_tgts[i]->ltd_activate) {
2283                         CWARN("lov idx %d was administratively disabled, skip quotacheck on it.\n",
2284                               i);
2285                         continue;
2286                 }
2287
2288                 if (!lov->lov_tgts[i]->ltd_active) {
2289                         CERROR("lov idx %d inactive\n", i);
2290                         rc = -EIO;
2291                         goto out;
2292                 }
2293         }
2294
2295         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2296                 int err;
2297
2298                 if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_activate)
2299                         continue;
2300
2301                 err = obd_quotacheck(lov->lov_tgts[i]->ltd_exp, oqctl);
2302                 if (err && !rc)
2303                         rc = err;
2304         }
2305
2306 out:
2307         obd_putref(obd);
2308
2309         return rc;
2310 }
2311
2312 static struct obd_ops lov_obd_ops = {
2313         .owner          = THIS_MODULE,
2314         .setup          = lov_setup,
2315         .precleanup     = lov_precleanup,
2316         .cleanup        = lov_cleanup,
2317         /*.process_config       = lov_process_config,*/
2318         .connect        = lov_connect,
2319         .disconnect     = lov_disconnect,
2320         .statfs         = lov_statfs,
2321         .statfs_async   = lov_statfs_async,
2322         .packmd         = lov_packmd,
2323         .unpackmd       = lov_unpackmd,
2324         .create         = lov_create,
2325         .destroy        = lov_destroy,
2326         .getattr_async  = lov_getattr_async,
2327         .setattr_async  = lov_setattr_async,
2328         .adjust_kms     = lov_adjust_kms,
2329         .find_cbdata    = lov_find_cbdata,
2330         .iocontrol      = lov_iocontrol,
2331         .get_info       = lov_get_info,
2332         .set_info_async = lov_set_info_async,
2333         .notify         = lov_notify,
2334         .pool_new       = lov_pool_new,
2335         .pool_rem       = lov_pool_remove,
2336         .pool_add       = lov_pool_add,
2337         .pool_del       = lov_pool_del,
2338         .getref         = lov_getref,
2339         .putref         = lov_putref,
2340         .quotactl       = lov_quotactl,
2341         .quotacheck     = lov_quotacheck,
2342 };
2343
2344 struct kmem_cache *lov_oinfo_slab;
2345
2346 static int __init lov_init(void)
2347 {
2348         struct lprocfs_static_vars lvars = { NULL };
2349         int rc;
2350
2351         /* print an address of _any_ initialized kernel symbol from this
2352          * module, to allow debugging with gdb that doesn't support data
2353          * symbols from modules.
2354          */
2355         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
2356
2357         rc = lu_kmem_init(lov_caches);
2358         if (rc)
2359                 return rc;
2360
2361         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
2362                                            sizeof(struct lov_oinfo),
2363                                            0, SLAB_HWCACHE_ALIGN, NULL);
2364         if (!lov_oinfo_slab) {
2365                 lu_kmem_fini(lov_caches);
2366                 return -ENOMEM;
2367         }
2368         lprocfs_lov_init_vars(&lvars);
2369
2370         rc = class_register_type(&lov_obd_ops, NULL,
2371                                  LUSTRE_LOV_NAME, &lov_device_type);
2372
2373         if (rc) {
2374                 kmem_cache_destroy(lov_oinfo_slab);
2375                 lu_kmem_fini(lov_caches);
2376         }
2377
2378         return rc;
2379 }
2380
2381 static void /*__exit*/ lov_exit(void)
2382 {
2383         class_unregister_type(LUSTRE_LOV_NAME);
2384         kmem_cache_destroy(lov_oinfo_slab);
2385
2386         lu_kmem_fini(lov_caches);
2387 }
2388
2389 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2390 MODULE_DESCRIPTION("Lustre Logical Object Volume");
2391 MODULE_LICENSE("GPL");
2392 MODULE_VERSION(LUSTRE_VERSION_STRING);
2393
2394 module_init(lov_init);
2395 module_exit(lov_exit);