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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lov/lov_obd.c
  37  *
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  * Author: Peter Braam <braam@clusterfs.com>
  40  * Author: Mike Shaver <shaver@clusterfs.com>
  41  * Author: Nathan Rutman <nathan@clusterfs.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_LOV
  45 #include "../../include/linux/libcfs/libcfs.h"
  46
  47 #include "../include/obd_support.h"
  48 #include "../include/lustre_lib.h"
  49 #include "../include/lustre_net.h"
  50 #include "../include/lustre/lustre_idl.h"
  51 #include "../include/lustre_dlm.h"
  52 #include "../include/lustre_mds.h"
  53 #include "../include/obd_class.h"
  54 #include "../include/lprocfs_status.h"
  55 #include "../include/lustre_param.h"
  56 #include "../include/cl_object.h"
  57 #include "../include/lclient.h"         /* for cl_client_lru */
  58 #include "../include/lustre/ll_fiemap.h"
  59 #include "../include/lustre_fid.h"
  60
  61 #include "lov_internal.h"
  62
  63 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
  64    Any function that expects lov_tgts to remain stationary must take a ref. */
  65 static void lov_getref(struct obd_device *obd)
  66 {
  67         struct lov_obd *lov = &obd->u.lov;
  68
  69         /* nobody gets through here until lov_putref is done */
  70         mutex_lock(&lov->lov_lock);
  71         atomic_inc(&lov->lov_refcount);
  72         mutex_unlock(&lov->lov_lock);
  73         return;
  74 }
  75
  76 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
  77
  78 static void lov_putref(struct obd_device *obd)
  79 {
  80         struct lov_obd *lov = &obd->u.lov;
  81
  82         mutex_lock(&lov->lov_lock);
  83         /* ok to dec to 0 more than once -- ltd_exp's will be null */
  84         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
  85                 LIST_HEAD(kill);
  86                 int i;
  87                 struct lov_tgt_desc *tgt, *n;
  88                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
  89                        lov->lov_death_row);
  90                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
  91                         tgt = lov->lov_tgts[i];
  92
  93                         if (!tgt || !tgt->ltd_reap)
  94                                 continue;
  95                         list_add(&tgt->ltd_kill, &kill);
  96                         /* XXX - right now there is a dependency on ld_tgt_count
  97                          * being the maximum tgt index for computing the
  98                          * mds_max_easize. So we can't shrink it. */
  99                         lov_ost_pool_remove(&lov->lov_packed, i);
 100                         lov->lov_tgts[i] = NULL;
 101                         lov->lov_death_row--;
 102                 }
 103                 mutex_unlock(&lov->lov_lock);
 104
 105                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
 106                         list_del(&tgt->ltd_kill);
 107                         /* Disconnect */
 108                         __lov_del_obd(obd, tgt);
 109                 }
 110         } else {
 111                 mutex_unlock(&lov->lov_lock);
 112         }
 113 }
 114
 115 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 116                               enum obd_notify_event ev);
 117 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 118                       enum obd_notify_event ev, void *data);
 119
 120
 121 #define MAX_STRING_SIZE 128
 122 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 123                     struct obd_connect_data *data)
 124 {
 125         struct lov_obd *lov = &obd->u.lov;
 126         struct obd_uuid *tgt_uuid;
 127         struct obd_device *tgt_obd;
 128         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 129         struct obd_import *imp;
 130         struct proc_dir_entry *lov_proc_dir;
 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                 ptlrpc_activate_import(imp);
 160         }
 161
 162         rc = obd_register_observer(tgt_obd, obd);
 163         if (rc) {
 164                 CERROR("Target %s register_observer error %d\n",
 165                        obd_uuid2str(tgt_uuid), rc);
 166                 return rc;
 167         }
 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         lov_proc_dir = obd->obd_proc_private;
 190         if (lov_proc_dir) {
 191                 struct obd_device *osc_obd = lov->lov_tgts[index]->ltd_exp->exp_obd;
 192                 struct proc_dir_entry *osc_symlink;
 193
 194                 LASSERT(osc_obd != NULL);
 195                 LASSERT(osc_obd->obd_magic == OBD_DEVICE_MAGIC);
 196                 LASSERT(osc_obd->obd_type->typ_name != NULL);
 197
 198                 osc_symlink = lprocfs_add_symlink(osc_obd->obd_name,
 199                                                   lov_proc_dir,
 200                                                   "../../../%s/%s",
 201                                                   osc_obd->obd_type->typ_name,
 202                                                   osc_obd->obd_name);
 203                 if (osc_symlink == NULL) {
 204                         CERROR("could not register LOV target /proc/fs/lustre/%s/%s/target_obds/%s.",
 205                                obd->obd_type->typ_name, obd->obd_name,
 206                                osc_obd->obd_name);
 207                         lprocfs_remove(&lov_proc_dir);
 208                         obd->obd_proc_private = NULL;
 209                 }
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int lov_connect(const struct lu_env *env,
 216                        struct obd_export **exp, struct obd_device *obd,
 217                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 218                        void *localdata)
 219 {
 220         struct lov_obd *lov = &obd->u.lov;
 221         struct lov_tgt_desc *tgt;
 222         struct lustre_handle conn;
 223         int i, rc;
 224
 225         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
 226
 227         rc = class_connect(&conn, obd, cluuid);
 228         if (rc)
 229                 return rc;
 230
 231         *exp = class_conn2export(&conn);
 232
 233         /* Why should there ever be more than 1 connect? */
 234         lov->lov_connects++;
 235         LASSERT(lov->lov_connects == 1);
 236
 237         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
 238         if (data)
 239                 lov->lov_ocd = *data;
 240
 241         obd_getref(obd);
 242         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 243                 tgt = lov->lov_tgts[i];
 244                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
 245                         continue;
 246                 /* Flags will be lowest common denominator */
 247                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
 248                 if (rc) {
 249                         CERROR("%s: lov connect tgt %d failed: %d\n",
 250                                obd->obd_name, i, rc);
 251                         continue;
 252                 }
 253                 /* connect to administrative disabled ost */
 254                 if (!lov->lov_tgts[i]->ltd_exp)
 255                         continue;
 256
 257                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
 258                                 OBD_NOTIFY_CONNECT, (void *)&i);
 259                 if (rc) {
 260                         CERROR("%s error sending notify %d\n",
 261                                obd->obd_name, rc);
 262                 }
 263         }
 264         obd_putref(obd);
 265
 266         return 0;
 267 }
 268
 269 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 270 {
 271         struct proc_dir_entry *lov_proc_dir;
 272         struct lov_obd *lov = &obd->u.lov;
 273         struct obd_device *osc_obd;
 274         int rc;
 275
 276         osc_obd = class_exp2obd(tgt->ltd_exp);
 277         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
 278                 obd->obd_name, osc_obd ? osc_obd->obd_name : "NULL");
 279
 280         if (tgt->ltd_active) {
 281                 tgt->ltd_active = 0;
 282                 lov->desc.ld_active_tgt_count--;
 283                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
 284         }
 285
 286         if (osc_obd) {
 287                 lov_proc_dir = obd->obd_proc_private;
 288                 if (lov_proc_dir) {
 289                         lprocfs_remove_proc_entry(osc_obd->obd_name, lov_proc_dir);
 290                 }
 291                 /* Pass it on to our clients.
 292                  * XXX This should be an argument to disconnect,
 293                  * XXX not a back-door flag on the OBD.  Ah well.
 294                  */
 295                 osc_obd->obd_force = obd->obd_force;
 296                 osc_obd->obd_fail = obd->obd_fail;
 297                 osc_obd->obd_no_recov = obd->obd_no_recov;
 298         }
 299
 300         obd_register_observer(osc_obd, NULL);
 301
 302         rc = obd_disconnect(tgt->ltd_exp);
 303         if (rc) {
 304                 CERROR("Target %s disconnect error %d\n",
 305                        tgt->ltd_uuid.uuid, rc);
 306                 rc = 0;
 307         }
 308
 309         tgt->ltd_exp = NULL;
 310         return 0;
 311 }
 312
 313 static int lov_disconnect(struct obd_export *exp)
 314 {
 315         struct obd_device *obd = class_exp2obd(exp);
 316         struct lov_obd *lov = &obd->u.lov;
 317         int i, rc;
 318
 319         if (!lov->lov_tgts)
 320                 goto out;
 321
 322         /* Only disconnect the underlying layers on the final disconnect. */
 323         lov->lov_connects--;
 324         if (lov->lov_connects != 0) {
 325                 /* why should there be more than 1 connect? */
 326                 CERROR("disconnect #%d\n", lov->lov_connects);
 327                 goto out;
 328         }
 329
 330         /* Let's hold another reference so lov_del_obd doesn't spin through
 331            putref every time */
 332         obd_getref(obd);
 333
 334         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 335                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
 336                         /* Disconnection is the last we know about an obd */
 337                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
 338                 }
 339         }
 340         obd_putref(obd);
 341
 342 out:
 343         rc = class_disconnect(exp); /* bz 9811 */
 344         return rc;
 345 }
 346
 347 /* Error codes:
 348  *
 349  *  -EINVAL  : UUID can't be found in the LOV's target list
 350  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 351  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 352  *  any >= 0 : is log target index
 353  */
 354 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
 355                               enum obd_notify_event ev)
 356 {
 357         struct lov_obd *lov = &obd->u.lov;
 358         struct lov_tgt_desc *tgt;
 359         int index, activate, active;
 360
 361         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
 362                lov, uuid->uuid, ev);
 363
 364         obd_getref(obd);
 365         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
 366                 tgt = lov->lov_tgts[index];
 367                 if (!tgt)
 368                         continue;
 369                 /*
 370                  * LU-642, initially inactive OSC could miss the obd_connect,
 371                  * we make up for it here.
 372                  */
 373                 if (ev == OBD_NOTIFY_ACTIVATE && tgt->ltd_exp == NULL &&
 374                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 375                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
 376
 377                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
 378                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
 379                 }
 380                 if (!tgt->ltd_exp)
 381                         continue;
 382
 383                 CDEBUG(D_INFO, "lov idx %d is %s conn %#llx\n",
 384                        index, obd_uuid2str(&tgt->ltd_uuid),
 385                        tgt->ltd_exp->exp_handle.h_cookie);
 386                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 387                         break;
 388         }
 389
 390         if (index == lov->desc.ld_tgt_count) {
 391                 index = -EINVAL;
 392                 goto out;
 393         }
 394
 395         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
 396                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
 397
 398                 if (lov->lov_tgts[index]->ltd_activate == activate) {
 399                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
 400                                uuid->uuid, activate ? "" : "de");
 401                 } else {
 402                         lov->lov_tgts[index]->ltd_activate = activate;
 403                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
 404                                activate ? "" : "de", obd_uuid2str(uuid));
 405                 }
 406
 407         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
 408                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
 409
 410                 if (lov->lov_tgts[index]->ltd_active == active) {
 411                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
 412                                uuid->uuid, active ? "" : "in");
 413                         goto out;
 414                 } else {
 415                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
 416                                obd_uuid2str(uuid), active ? "" : "in");
 417                 }
 418
 419                 lov->lov_tgts[index]->ltd_active = active;
 420                 if (active) {
 421                         lov->desc.ld_active_tgt_count++;
 422                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
 423                 } else {
 424                         lov->desc.ld_active_tgt_count--;
 425                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
 426                 }
 427         } else {
 428                 CERROR("Unknown event(%d) for uuid %s", ev, uuid->uuid);
 429         }
 430
 431  out:
 432         obd_putref(obd);
 433         return index;
 434 }
 435
 436 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 437                       enum obd_notify_event ev, void *data)
 438 {
 439         int rc = 0;
 440         struct lov_obd *lov = &obd->u.lov;
 441
 442         down_read(&lov->lov_notify_lock);
 443         if (!lov->lov_connects) {
 444                 up_read(&lov->lov_notify_lock);
 445                 return rc;
 446         }
 447
 448         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
 449             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
 450                 struct obd_uuid *uuid;
 451
 452                 LASSERT(watched);
 453
 454                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 455                         up_read(&lov->lov_notify_lock);
 456                         CERROR("unexpected notification of %s %s!\n",
 457                                watched->obd_type->typ_name,
 458                                watched->obd_name);
 459                         return -EINVAL;
 460                 }
 461                 uuid = &watched->u.cli.cl_target_uuid;
 462
 463                 /* Set OSC as active before notifying the observer, so the
 464                  * observer can use the OSC normally.
 465                  */
 466                 rc = lov_set_osc_active(obd, uuid, ev);
 467                 if (rc < 0) {
 468                         up_read(&lov->lov_notify_lock);
 469                         CERROR("event(%d) of %s failed: %d\n", ev,
 470                                obd_uuid2str(uuid), rc);
 471                         return rc;
 472                 }
 473                 /* active event should be pass lov target index as data */
 474                 data = &rc;
 475         }
 476
 477         /* Pass the notification up the chain. */
 478         if (watched) {
 479                 rc = obd_notify_observer(obd, watched, ev, data);
 480         } else {
 481                 /* NULL watched means all osc's in the lov (only for syncs) */
 482                 /* sync event should be send lov idx as data */
 483                 struct lov_obd *lov = &obd->u.lov;
 484                 int i, is_sync;
 485
 486                 data = &i;
 487                 is_sync = (ev == OBD_NOTIFY_SYNC) ||
 488                           (ev == OBD_NOTIFY_SYNC_NONBLOCK);
 489
 490                 obd_getref(obd);
 491                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 492                         if (!lov->lov_tgts[i])
 493                                 continue;
 494
 495                         /* don't send sync event if target not
 496                          * connected/activated */
 497                         if (is_sync &&  !lov->lov_tgts[i]->ltd_active)
 498                                 continue;
 499
 500                         rc = obd_notify_observer(obd, lov->lov_tgts[i]->ltd_obd,
 501                                                  ev, data);
 502                         if (rc) {
 503                                 CERROR("%s: notify %s of %s failed %d\n",
 504                                        obd->obd_name,
 505                                        obd->obd_observer->obd_name,
 506                                        lov->lov_tgts[i]->ltd_obd->obd_name,
 507                                        rc);
 508                         }
 509                 }
 510                 obd_putref(obd);
 511         }
 512
 513         up_read(&lov->lov_notify_lock);
 514         return rc;
 515 }
 516
 517 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 518                           __u32 index, int gen, int active)
 519 {
 520         struct lov_obd *lov = &obd->u.lov;
 521         struct lov_tgt_desc *tgt;
 522         struct obd_device *tgt_obd;
 523         int rc;
 524
 525         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
 526                uuidp->uuid, index, gen, active);
 527
 528         if (gen <= 0) {
 529                 CERROR("request to add OBD %s with invalid generation: %d\n",
 530                        uuidp->uuid, gen);
 531                 return -EINVAL;
 532         }
 533
 534         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
 535                                         &obd->obd_uuid);
 536         if (tgt_obd == NULL)
 537                 return -EINVAL;
 538
 539         mutex_lock(&lov->lov_lock);
 540
 541         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
 542                 tgt = lov->lov_tgts[index];
 543                 CERROR("UUID %s already assigned at LOV target index %d\n",
 544                        obd_uuid2str(&tgt->ltd_uuid), index);
 545                 mutex_unlock(&lov->lov_lock);
 546                 return -EEXIST;
 547         }
 548
 549         if (index >= lov->lov_tgt_size) {
 550                 /* We need to reallocate the lov target array. */
 551                 struct lov_tgt_desc **newtgts, **old = NULL;
 552                 __u32 newsize, oldsize = 0;
 553
 554                 newsize = max_t(__u32, lov->lov_tgt_size, 2);
 555                 while (newsize < index + 1)
 556                         newsize <<= 1;
 557                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 558                 if (newtgts == NULL) {
 559                         mutex_unlock(&lov->lov_lock);
 560                         return -ENOMEM;
 561                 }
 562
 563                 if (lov->lov_tgt_size) {
 564                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
 565                                lov->lov_tgt_size);
 566                         old = lov->lov_tgts;
 567                         oldsize = lov->lov_tgt_size;
 568                 }
 569
 570                 lov->lov_tgts = newtgts;
 571                 lov->lov_tgt_size = newsize;
 572                 smp_rmb();
 573                 if (old)
 574                         OBD_FREE(old, sizeof(*old) * oldsize);
 575
 576                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 577                        lov->lov_tgts, lov->lov_tgt_size);
 578         }
 579
 580         OBD_ALLOC_PTR(tgt);
 581         if (!tgt) {
 582                 mutex_unlock(&lov->lov_lock);
 583                 return -ENOMEM;
 584         }
 585
 586         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
 587         if (rc) {
 588                 mutex_unlock(&lov->lov_lock);
 589                 OBD_FREE_PTR(tgt);
 590                 return rc;
 591         }
 592
 593         tgt->ltd_uuid = *uuidp;
 594         tgt->ltd_obd = tgt_obd;
 595         /* XXX - add a sanity check on the generation number. */
 596         tgt->ltd_gen = gen;
 597         tgt->ltd_index = index;
 598         tgt->ltd_activate = active;
 599         lov->lov_tgts[index] = tgt;
 600         if (index >= lov->desc.ld_tgt_count)
 601                 lov->desc.ld_tgt_count = index + 1;
 602
 603         mutex_unlock(&lov->lov_lock);
 604
 605         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 606                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 607
 608         rc = obd_notify(obd, tgt_obd, OBD_NOTIFY_CREATE, &index);
 609
 610         if (lov->lov_connects == 0) {
 611                 /* lov_connect hasn't been called yet. We'll do the
 612                    lov_connect_obd on this target when that fn first runs,
 613                    because we don't know the connect flags yet. */
 614                 return 0;
 615         }
 616
 617         obd_getref(obd);
 618
 619         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
 620         if (rc)
 621                 goto out;
 622
 623         /* connect to administrative disabled ost */
 624         if (!tgt->ltd_exp) {
 625                 rc = 0;
 626                 goto out;
 627         }
 628
 629         if (lov->lov_cache != NULL) {
 630                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
 631                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
 632                                 sizeof(struct cl_client_cache), lov->lov_cache,
 633                                 NULL);
 634                 if (rc < 0)
 635                         goto out;
 636         }
 637
 638         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
 639                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
 640                         (void *)&index);
 641
 642 out:
 643         if (rc) {
 644                 CERROR("add failed (%d), deleting %s\n", rc,
 645                        obd_uuid2str(&tgt->ltd_uuid));
 646                 lov_del_target(obd, index, NULL, 0);
 647         }
 648         obd_putref(obd);
 649         return rc;
 650 }
 651
 652 /* Schedule a target for deletion */
 653 int lov_del_target(struct obd_device *obd, __u32 index,
 654                    struct obd_uuid *uuidp, int gen)
 655 {
 656         struct lov_obd *lov = &obd->u.lov;
 657         int count = lov->desc.ld_tgt_count;
 658         int rc = 0;
 659
 660         if (index >= count) {
 661                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 662                        index, count);
 663                 return -EINVAL;
 664         }
 665
 666         /* to make sure there's no ongoing lov_notify() now */
 667         down_write(&lov->lov_notify_lock);
 668         obd_getref(obd);
 669
 670         if (!lov->lov_tgts[index]) {
 671                 CERROR("LOV target at index %d is not setup.\n", index);
 672                 rc = -EINVAL;
 673                 goto out;
 674         }
 675
 676         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
 677                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 678                        lov_uuid2str(lov, index), index,
 679                        obd_uuid2str(uuidp));
 680                 rc = -EINVAL;
 681                 goto out;
 682         }
 683
 684         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 685                lov_uuid2str(lov, index), index,
 686                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
 687                lov->lov_tgts[index]->ltd_active);
 688
 689         lov->lov_tgts[index]->ltd_reap = 1;
 690         lov->lov_death_row++;
 691         /* we really delete it from obd_putref */
 692 out:
 693         obd_putref(obd);
 694         up_write(&lov->lov_notify_lock);
 695
 696         return rc;
 697 }
 698
 699 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 700 {
 701         struct obd_device *osc_obd;
 702
 703         LASSERT(tgt);
 704         LASSERT(tgt->ltd_reap);
 705
 706         osc_obd = class_exp2obd(tgt->ltd_exp);
 707
 708         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
 709                tgt->ltd_uuid.uuid,
 710                osc_obd ? osc_obd->obd_name : "<no obd>");
 711
 712         if (tgt->ltd_exp)
 713                 lov_disconnect_obd(obd, tgt);
 714
 715         OBD_FREE_PTR(tgt);
 716
 717         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
 718            do it ourselves. And we can't do it from lov_cleanup,
 719            because we just lost our only reference to it. */
 720         if (osc_obd)
 721                 class_manual_cleanup(osc_obd);
 722 }
 723
 724 void lov_fix_desc_stripe_size(__u64 *val)
 725 {
 726         if (*val < LOV_MIN_STRIPE_SIZE) {
 727                 if (*val != 0)
 728                         LCONSOLE_INFO("Increasing default stripe size to minimum %u\n",
 729                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
 730                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
 731         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 732                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 733                 LCONSOLE_WARN("Changing default stripe size to %llu (a multiple of %u)\n",
 734                               *val, LOV_MIN_STRIPE_SIZE);
 735         }
 736 }
 737
 738 void lov_fix_desc_stripe_count(__u32 *val)
 739 {
 740         if (*val == 0)
 741                 *val = 1;
 742 }
 743
 744 void lov_fix_desc_pattern(__u32 *val)
 745 {
 746         /* from lov_setstripe */
 747         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 748                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 749                 *val = 0;
 750         }
 751 }
 752
 753 void lov_fix_desc_qos_maxage(__u32 *val)
 754 {
 755         if (*val == 0)
 756                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
 757 }
 758
 759 void lov_fix_desc(struct lov_desc *desc)
 760 {
 761         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 762         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 763         lov_fix_desc_pattern(&desc->ld_pattern);
 764         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 765 }
 766
 767 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 768 {
 769         struct lprocfs_static_vars lvars = { NULL };
 770         struct lov_desc *desc;
 771         struct lov_obd *lov = &obd->u.lov;
 772         int rc;
 773
 774         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 775                 CERROR("LOV setup requires a descriptor\n");
 776                 return -EINVAL;
 777         }
 778
 779         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 780
 781         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 782                 CERROR("descriptor size wrong: %d > %d\n",
 783                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 784                 return -EINVAL;
 785         }
 786
 787         if (desc->ld_magic != LOV_DESC_MAGIC) {
 788                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 789                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 790                                    obd->obd_name, desc);
 791                             lustre_swab_lov_desc(desc);
 792                 } else {
 793                         CERROR("%s: Bad lov desc magic: %#x\n",
 794                                obd->obd_name, desc->ld_magic);
 795                         return -EINVAL;
 796                 }
 797         }
 798
 799         lov_fix_desc(desc);
 800
 801         desc->ld_active_tgt_count = 0;
 802         lov->desc = *desc;
 803         lov->lov_tgt_size = 0;
 804
 805         mutex_init(&lov->lov_lock);
 806         atomic_set(&lov->lov_refcount, 0);
 807         lov->lov_sp_me = LUSTRE_SP_CLI;
 808
 809         init_rwsem(&lov->lov_notify_lock);
 810
 811         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
 812                                                    HASH_POOLS_MAX_BITS,
 813                                                    HASH_POOLS_BKT_BITS, 0,
 814                                                    CFS_HASH_MIN_THETA,
 815                                                    CFS_HASH_MAX_THETA,
 816                                                    &pool_hash_operations,
 817                                                    CFS_HASH_DEFAULT);
 818         INIT_LIST_HEAD(&lov->lov_pool_list);
 819         lov->lov_pool_count = 0;
 820         rc = lov_ost_pool_init(&lov->lov_packed, 0);
 821         if (rc)
 822                 goto out;
 823
 824         lprocfs_lov_init_vars(&lvars);
 825         lprocfs_obd_setup(obd, lvars.obd_vars);
 826 #if defined (CONFIG_PROC_FS)
 827         {
 828                 int rc1;
 829
 830                 rc1 = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
 831                                         0444, &lov_proc_target_fops, obd);
 832                 if (rc1)
 833                         CWARN("Error adding the target_obd file\n");
 834         }
 835 #endif
 836         lov->lov_pool_proc_entry = lprocfs_register("pools",
 837                                                     obd->obd_proc_entry,
 838                                                     NULL, NULL);
 839
 840         return 0;
 841
 842 out:
 843         return rc;
 844 }
 845
 846 static int lov_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 847 {
 848         struct lov_obd *lov = &obd->u.lov;
 849
 850         switch (stage) {
 851         case OBD_CLEANUP_EARLY: {
 852                 int i;
 853                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 854                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_active)
 855                                 continue;
 856                         obd_precleanup(class_exp2obd(lov->lov_tgts[i]->ltd_exp),
 857                                        OBD_CLEANUP_EARLY);
 858                 }
 859                 break;
 860         }
 861         default:
 862                 break;
 863         }
 864
 865         return 0;
 866 }
 867
 868 static int lov_cleanup(struct obd_device *obd)
 869 {
 870         struct lov_obd *lov = &obd->u.lov;
 871         struct list_head *pos, *tmp;
 872         struct pool_desc *pool;
 873
 874         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
 875                 pool = list_entry(pos, struct pool_desc, pool_list);
 876                 /* free pool structs */
 877                 CDEBUG(D_INFO, "delete pool %p\n", pool);
 878                 /* In the function below, .hs_keycmp resolves to
 879                  * pool_hashkey_keycmp() */
 880                 /* coverity[overrun-buffer-val] */
 881                 lov_pool_del(obd, pool->pool_name);
 882         }
 883         cfs_hash_putref(lov->lov_pools_hash_body);
 884         lov_ost_pool_free(&lov->lov_packed);
 885
 886         lprocfs_obd_cleanup(obd);
 887         if (lov->lov_tgts) {
 888                 int i;
 889                 obd_getref(obd);
 890                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 891                         if (!lov->lov_tgts[i])
 892                                 continue;
 893
 894                         /* Inactive targets may never have connected */
 895                         if (lov->lov_tgts[i]->ltd_active ||
 896                             atomic_read(&lov->lov_refcount))
 897                             /* We should never get here - these
 898                                should have been removed in the
 899                              disconnect. */
 900                                 CERROR("lov tgt %d not cleaned! deathrow=%d, lovrc=%d\n",
 901                                        i, lov->lov_death_row,
 902                                        atomic_read(&lov->lov_refcount));
 903                         lov_del_target(obd, i, NULL, 0);
 904                 }
 905                 obd_putref(obd);
 906                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
 907                          lov->lov_tgt_size);
 908                 lov->lov_tgt_size = 0;
 909         }
 910         return 0;
 911 }
 912
 913 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 914                             __u32 *indexp, int *genp)
 915 {
 916         struct obd_uuid obd_uuid;
 917         int cmd;
 918         int rc = 0;
 919
 920         switch (cmd = lcfg->lcfg_command) {
 921         case LCFG_LOV_ADD_OBD:
 922         case LCFG_LOV_ADD_INA:
 923         case LCFG_LOV_DEL_OBD: {
 924                 __u32 index;
 925                 int gen;
 926                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 927                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid)) {
 928                         rc = -EINVAL;
 929                         goto out;
 930                 }
 931
 932                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 933
 934                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", indexp) != 1) {
 935                         rc = -EINVAL;
 936                         goto out;
 937                 }
 938                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1) {
 939                         rc = -EINVAL;
 940                         goto out;
 941                 }
 942                 index = *indexp;
 943                 gen = *genp;
 944                 if (cmd == LCFG_LOV_ADD_OBD)
 945                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 946                 else if (cmd == LCFG_LOV_ADD_INA)
 947                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 948                 else
 949                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 950                 goto out;
 951         }
 952         case LCFG_PARAM: {
 953                 struct lprocfs_static_vars lvars = { NULL };
 954                 struct lov_desc *desc = &(obd->u.lov.desc);
 955
 956                 if (!desc) {
 957                         rc = -EINVAL;
 958                         goto out;
 959                 }
 960
 961                 lprocfs_lov_init_vars(&lvars);
 962
 963                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 964                                               lcfg, obd);
 965                 if (rc > 0)
 966                         rc = 0;
 967                 goto out;
 968         }
 969         case LCFG_POOL_NEW:
 970         case LCFG_POOL_ADD:
 971         case LCFG_POOL_DEL:
 972         case LCFG_POOL_REM:
 973                 goto out;
 974
 975         default: {
 976                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 977                 rc = -EINVAL;
 978                 goto out;
 979
 980         }
 981         }
 982 out:
 983         return rc;
 984 }
 985
 986 static int lov_recreate(struct obd_export *exp, struct obdo *src_oa,
 987                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
 988 {
 989         struct lov_stripe_md *obj_mdp, *lsm;
 990         struct lov_obd *lov = &exp->exp_obd->u.lov;
 991         unsigned ost_idx;
 992         int rc, i;
 993
 994         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 995                 src_oa->o_flags & OBD_FL_RECREATE_OBJS);
 996
 997         OBD_ALLOC(obj_mdp, sizeof(*obj_mdp));
 998         if (obj_mdp == NULL)
 999                 return -ENOMEM;
1000
1001         ost_idx = src_oa->o_nlink;
1002         lsm = *ea;
1003         if (lsm == NULL) {
1004                 rc = -EINVAL;
1005                 goto out;
1006         }
1007         if (ost_idx >= lov->desc.ld_tgt_count ||
1008             !lov->lov_tgts[ost_idx]) {
1009                 rc = -EINVAL;
1010                 goto out;
1011         }
1012
1013         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1014                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1015
1016                 if (lov_oinfo_is_dummy(loi))
1017                         continue;
1018
1019                 if (loi->loi_ost_idx == ost_idx) {
1020                         if (ostid_id(&loi->loi_oi) != ostid_id(&src_oa->o_oi)) {
1021                                 rc = -EINVAL;
1022                                 goto out;
1023                         }
1024                         break;
1025                 }
1026         }
1027         if (i == lsm->lsm_stripe_count) {
1028                 rc = -EINVAL;
1029                 goto out;
1030         }
1031
1032         rc = obd_create(NULL, lov->lov_tgts[ost_idx]->ltd_exp,
1033                         src_oa, &obj_mdp, oti);
1034 out:
1035         OBD_FREE(obj_mdp, sizeof(*obj_mdp));
1036         return rc;
1037 }
1038
1039 /* the LOV expects oa->o_id to be set to the LOV object id */
1040 static int lov_create(const struct lu_env *env, struct obd_export *exp,
1041                       struct obdo *src_oa, struct lov_stripe_md **ea,
1042                       struct obd_trans_info *oti)
1043 {
1044         struct lov_obd *lov;
1045         int rc = 0;
1046
1047         LASSERT(ea != NULL);
1048         if (exp == NULL)
1049                 return -EINVAL;
1050
1051         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1052             src_oa->o_flags == OBD_FL_DELORPHAN) {
1053                 /* should be used with LOV anymore */
1054                 LBUG();
1055         }
1056
1057         lov = &exp->exp_obd->u.lov;
1058         if (!lov->desc.ld_active_tgt_count)
1059                 return -EIO;
1060
1061         obd_getref(exp->exp_obd);
1062         /* Recreate a specific object id at the given OST index */
1063         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1064             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
1065                  rc = lov_recreate(exp, src_oa, ea, oti);
1066         }
1067
1068         obd_putref(exp->exp_obd);
1069         return rc;
1070 }
1071
1072 #define ASSERT_LSM_MAGIC(lsmp)                                            \
1073 do {                                                                        \
1074         LASSERT((lsmp) != NULL);                                                \
1075         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                    \
1076                  (lsmp)->lsm_magic == LOV_MAGIC_V3),                        \
1077                  "%p->lsm_magic=%x\n", (lsmp), (lsmp)->lsm_magic);            \
1078 } while (0)
1079
1080 static int lov_destroy(const struct lu_env *env, struct obd_export *exp,
1081                        struct obdo *oa, struct lov_stripe_md *lsm,
1082                        struct obd_trans_info *oti, struct obd_export *md_exp,
1083                        void *capa)
1084 {
1085         struct lov_request_set *set;
1086         struct obd_info oinfo;
1087         struct lov_request *req;
1088         struct list_head *pos;
1089         struct lov_obd *lov;
1090         int rc = 0, err = 0;
1091
1092         ASSERT_LSM_MAGIC(lsm);
1093
1094         if (!exp || !exp->exp_obd)
1095                 return -ENODEV;
1096
1097         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1098                 LASSERT(oti);
1099                 LASSERT(oti->oti_logcookies);
1100         }
1101
1102         lov = &exp->exp_obd->u.lov;
1103         obd_getref(exp->exp_obd);
1104         rc = lov_prep_destroy_set(exp, &oinfo, oa, lsm, oti, &set);
1105         if (rc)
1106                 goto out;
1107
1108         list_for_each(pos, &set->set_list) {
1109                 req = list_entry(pos, struct lov_request, rq_link);
1110
1111                 if (oa->o_valid & OBD_MD_FLCOOKIE)
1112                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1113
1114                 err = obd_destroy(env, lov->lov_tgts[req->rq_idx]->ltd_exp,
1115                                   req->rq_oi.oi_oa, NULL, oti, NULL, capa);
1116                 err = lov_update_common_set(set, req, err);
1117                 if (err) {
1118                         CERROR("%s: destroying objid "DOSTID" subobj "
1119                                DOSTID" on OST idx %d: rc = %d\n",
1120                                exp->exp_obd->obd_name, POSTID(&oa->o_oi),
1121                                POSTID(&req->rq_oi.oi_oa->o_oi),
1122                                req->rq_idx, err);
1123                         if (!rc)
1124                                 rc = err;
1125                 }
1126         }
1127
1128         if (rc == 0) {
1129                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
1130                 rc = lsm_op_find(lsm->lsm_magic)->lsm_destroy(lsm, oa, md_exp);
1131         }
1132         err = lov_fini_destroy_set(set);
1133 out:
1134         obd_putref(exp->exp_obd);
1135         return rc ? rc : err;
1136 }
1137
1138 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset,
1139                                  void *data, int rc)
1140 {
1141         struct lov_request_set *lovset = (struct lov_request_set *)data;
1142         int err;
1143
1144         /* don't do attribute merge if this async op failed */
1145         if (rc)
1146                 atomic_set(&lovset->set_completes, 0);
1147         err = lov_fini_getattr_set(lovset);
1148         return rc ? rc : err;
1149 }
1150
1151 static int lov_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
1152                               struct ptlrpc_request_set *rqset)
1153 {
1154         struct lov_request_set *lovset;
1155         struct lov_obd *lov;
1156         struct list_head *pos;
1157         struct lov_request *req;
1158         int rc = 0, err;
1159
1160         LASSERT(oinfo);
1161         ASSERT_LSM_MAGIC(oinfo->oi_md);
1162
1163         if (!exp || !exp->exp_obd)
1164                 return -ENODEV;
1165
1166         lov = &exp->exp_obd->u.lov;
1167
1168         rc = lov_prep_getattr_set(exp, oinfo, &lovset);
1169         if (rc)
1170                 return rc;
1171
1172         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1173                POSTID(&oinfo->oi_md->lsm_oi), oinfo->oi_md->lsm_stripe_count,
1174                oinfo->oi_md->lsm_stripe_size);
1175
1176         list_for_each(pos, &lovset->set_list) {
1177                 req = list_entry(pos, struct lov_request, rq_link);
1178
1179                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1180                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1181                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1182                 rc = obd_getattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1183                                        &req->rq_oi, rqset);
1184                 if (rc) {
1185                         CERROR("%s: getattr objid "DOSTID" subobj"
1186                                DOSTID" on OST idx %d: rc = %d\n",
1187                                exp->exp_obd->obd_name,
1188                                POSTID(&oinfo->oi_oa->o_oi),
1189                                POSTID(&req->rq_oi.oi_oa->o_oi),
1190                                req->rq_idx, rc);
1191                         goto out;
1192                 }
1193         }
1194
1195         if (!list_empty(&rqset->set_requests)) {
1196                 LASSERT(rc == 0);
1197                 LASSERT(rqset->set_interpret == NULL);
1198                 rqset->set_interpret = lov_getattr_interpret;
1199                 rqset->set_arg = (void *)lovset;
1200                 return rc;
1201         }
1202 out:
1203         if (rc)
1204                 atomic_set(&lovset->set_completes, 0);
1205         err = lov_fini_getattr_set(lovset);
1206         return rc ? rc : err;
1207 }
1208
1209 static int lov_setattr_interpret(struct ptlrpc_request_set *rqset,
1210                                  void *data, int rc)
1211 {
1212         struct lov_request_set *lovset = (struct lov_request_set *)data;
1213         int err;
1214
1215         if (rc)
1216                 atomic_set(&lovset->set_completes, 0);
1217         err = lov_fini_setattr_set(lovset);
1218         return rc ? rc : err;
1219 }
1220
1221 /* If @oti is given, the request goes from MDS and responses from OSTs are not
1222    needed. Otherwise, a client is waiting for responses. */
1223 static int lov_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
1224                              struct obd_trans_info *oti,
1225                              struct ptlrpc_request_set *rqset)
1226 {
1227         struct lov_request_set *set;
1228         struct lov_request *req;
1229         struct list_head *pos;
1230         struct lov_obd *lov;
1231         int rc = 0;
1232
1233         LASSERT(oinfo);
1234         ASSERT_LSM_MAGIC(oinfo->oi_md);
1235         if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE) {
1236                 LASSERT(oti);
1237                 LASSERT(oti->oti_logcookies);
1238         }
1239
1240         if (!exp || !exp->exp_obd)
1241                 return -ENODEV;
1242
1243         lov = &exp->exp_obd->u.lov;
1244         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1245         if (rc)
1246                 return rc;
1247
1248         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1249                POSTID(&oinfo->oi_md->lsm_oi),
1250                oinfo->oi_md->lsm_stripe_count,
1251                oinfo->oi_md->lsm_stripe_size);
1252
1253         list_for_each(pos, &set->set_list) {
1254                 req = list_entry(pos, struct lov_request, rq_link);
1255
1256                 if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
1257                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1258
1259                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1260                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1261                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1262
1263                 rc = obd_setattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1264                                        &req->rq_oi, oti, rqset);
1265                 if (rc) {
1266                         CERROR("error: setattr objid "DOSTID" subobj"
1267                                DOSTID" on OST idx %d: rc = %d\n",
1268                                POSTID(&set->set_oi->oi_oa->o_oi),
1269                                POSTID(&req->rq_oi.oi_oa->o_oi),
1270                                req->rq_idx, rc);
1271                         break;
1272                 }
1273         }
1274
1275         /* If we are not waiting for responses on async requests, return. */
1276         if (rc || !rqset || list_empty(&rqset->set_requests)) {
1277                 int err;
1278                 if (rc)
1279                         atomic_set(&set->set_completes, 0);
1280                 err = lov_fini_setattr_set(set);
1281                 return rc ? rc : err;
1282         }
1283
1284         LASSERT(rqset->set_interpret == NULL);
1285         rqset->set_interpret = lov_setattr_interpret;
1286         rqset->set_arg = (void *)set;
1287
1288         return 0;
1289 }
1290
1291 /* find any ldlm lock of the inode in lov
1292  * return 0    not find
1293  *      1    find one
1294  *      < 0    error */
1295 static int lov_find_cbdata(struct obd_export *exp,
1296                            struct lov_stripe_md *lsm, ldlm_iterator_t it,
1297                            void *data)
1298 {
1299         struct lov_obd *lov;
1300         int rc = 0, i;
1301
1302         ASSERT_LSM_MAGIC(lsm);
1303
1304         if (!exp || !exp->exp_obd)
1305                 return -ENODEV;
1306
1307         lov = &exp->exp_obd->u.lov;
1308         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1309                 struct lov_stripe_md submd;
1310                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1311
1312                 if (lov_oinfo_is_dummy(loi))
1313                         continue;
1314
1315                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1316                         CDEBUG(D_HA, "lov idx %d NULL\n", loi->loi_ost_idx);
1317                         continue;
1318                 }
1319
1320                 submd.lsm_oi = loi->loi_oi;
1321                 submd.lsm_stripe_count = 0;
1322                 rc = obd_find_cbdata(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1323                                      &submd, it, data);
1324                 if (rc != 0)
1325                         return rc;
1326         }
1327         return rc;
1328 }
1329
1330 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1331 {
1332         struct lov_request_set *lovset = (struct lov_request_set *)data;
1333         int err;
1334
1335         if (rc)
1336                 atomic_set(&lovset->set_completes, 0);
1337
1338         err = lov_fini_statfs_set(lovset);
1339         return rc ? rc : err;
1340 }
1341
1342 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
1343                             __u64 max_age, struct ptlrpc_request_set *rqset)
1344 {
1345         struct obd_device      *obd = class_exp2obd(exp);
1346         struct lov_request_set *set;
1347         struct lov_request *req;
1348         struct list_head *pos;
1349         struct lov_obd *lov;
1350         int rc = 0;
1351
1352         LASSERT(oinfo != NULL);
1353         LASSERT(oinfo->oi_osfs != NULL);
1354
1355         lov = &obd->u.lov;
1356         rc = lov_prep_statfs_set(obd, oinfo, &set);
1357         if (rc)
1358                 return rc;
1359
1360         list_for_each(pos, &set->set_list) {
1361                 req = list_entry(pos, struct lov_request, rq_link);
1362                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1363                                       &req->rq_oi, max_age, rqset);
1364                 if (rc)
1365                         break;
1366         }
1367
1368         if (rc || list_empty(&rqset->set_requests)) {
1369                 int err;
1370                 if (rc)
1371                         atomic_set(&set->set_completes, 0);
1372                 err = lov_fini_statfs_set(set);
1373                 return rc ? rc : err;
1374         }
1375
1376         LASSERT(rqset->set_interpret == NULL);
1377         rqset->set_interpret = lov_statfs_interpret;
1378         rqset->set_arg = (void *)set;
1379         return 0;
1380 }
1381
1382 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1383                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1384 {
1385         struct ptlrpc_request_set *set = NULL;
1386         struct obd_info oinfo = { { { 0 } } };
1387         int rc = 0;
1388
1389         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1390          * statfs requests */
1391         set = ptlrpc_prep_set();
1392         if (set == NULL)
1393                 return -ENOMEM;
1394
1395         oinfo.oi_osfs = osfs;
1396         oinfo.oi_flags = flags;
1397         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1398         if (rc == 0)
1399                 rc = ptlrpc_set_wait(set);
1400         ptlrpc_set_destroy(set);
1401
1402         return rc;
1403 }
1404
1405 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1406                          void *karg, void *uarg)
1407 {
1408         struct obd_device *obddev = class_exp2obd(exp);
1409         struct lov_obd *lov = &obddev->u.lov;
1410         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1411         struct obd_uuid *uuidp;
1412
1413         switch (cmd) {
1414         case IOC_OBD_STATFS: {
1415                 struct obd_ioctl_data *data = karg;
1416                 struct obd_device *osc_obd;
1417                 struct obd_statfs stat_buf = {0};
1418                 __u32 index;
1419                 __u32 flags;
1420
1421                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1422                 if ((index >= count))
1423                         return -ENODEV;
1424
1425                 if (!lov->lov_tgts[index])
1426                         /* Try again with the next index */
1427                         return -EAGAIN;
1428                 if (!lov->lov_tgts[index]->ltd_active)
1429                         return -ENODATA;
1430
1431                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1432                 if (!osc_obd)
1433                         return -EINVAL;
1434
1435                 /* copy UUID */
1436                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1437                                      min((int) data->ioc_plen2,
1438                                          (int) sizeof(struct obd_uuid))))
1439                         return -EFAULT;
1440
1441                 flags = uarg ? *(__u32 *)uarg : 0;
1442                 /* got statfs data */
1443                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1444                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1445                                 flags);
1446                 if (rc)
1447                         return rc;
1448                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1449                                      min((int) data->ioc_plen1,
1450                                          (int) sizeof(stat_buf))))
1451                         return -EFAULT;
1452                 break;
1453         }
1454         case OBD_IOC_LOV_GET_CONFIG: {
1455                 struct obd_ioctl_data *data;
1456                 struct lov_desc *desc;
1457                 char *buf = NULL;
1458                 __u32 *genp;
1459
1460                 len = 0;
1461                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
1462                         return -EINVAL;
1463
1464                 data = (struct obd_ioctl_data *)buf;
1465
1466                 if (sizeof(*desc) > data->ioc_inllen1) {
1467                         obd_ioctl_freedata(buf, len);
1468                         return -EINVAL;
1469                 }
1470
1471                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1472                         obd_ioctl_freedata(buf, len);
1473                         return -EINVAL;
1474                 }
1475
1476                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1477                         obd_ioctl_freedata(buf, len);
1478                         return -EINVAL;
1479                 }
1480
1481                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1482                 memcpy(desc, &(lov->desc), sizeof(*desc));
1483
1484                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1485                 genp = (__u32 *)data->ioc_inlbuf3;
1486                 /* the uuid will be empty for deleted OSTs */
1487                 for (i = 0; i < count; i++, uuidp++, genp++) {
1488                         if (!lov->lov_tgts[i])
1489                                 continue;
1490                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1491                         *genp = lov->lov_tgts[i]->ltd_gen;
1492                 }
1493
1494                 if (copy_to_user((void *)uarg, buf, len))
1495                         rc = -EFAULT;
1496                 obd_ioctl_freedata(buf, len);
1497                 break;
1498         }
1499         case LL_IOC_LOV_GETSTRIPE:
1500                 rc = lov_getstripe(exp, karg, uarg);
1501                 break;
1502         case OBD_IOC_QUOTACTL: {
1503                 struct if_quotactl *qctl = karg;
1504                 struct lov_tgt_desc *tgt = NULL;
1505                 struct obd_quotactl *oqctl;
1506
1507                 if (qctl->qc_valid == QC_OSTIDX) {
1508                         if (qctl->qc_idx < 0 || count <= qctl->qc_idx)
1509                                 return -EINVAL;
1510
1511                         tgt = lov->lov_tgts[qctl->qc_idx];
1512                         if (!tgt || !tgt->ltd_exp)
1513                                 return -EINVAL;
1514                 } else if (qctl->qc_valid == QC_UUID) {
1515                         for (i = 0; i < count; i++) {
1516                                 tgt = lov->lov_tgts[i];
1517                                 if (!tgt ||
1518                                     !obd_uuid_equals(&tgt->ltd_uuid,
1519                                                      &qctl->obd_uuid))
1520                                         continue;
1521
1522                                 if (tgt->ltd_exp == NULL)
1523                                         return -EINVAL;
1524
1525                                 break;
1526                         }
1527                 } else {
1528                         return -EINVAL;
1529                 }
1530
1531                 if (i >= count)
1532                         return -EAGAIN;
1533
1534                 LASSERT(tgt && tgt->ltd_exp);
1535                 OBD_ALLOC_PTR(oqctl);
1536                 if (!oqctl)
1537                         return -ENOMEM;
1538
1539                 QCTL_COPY(oqctl, qctl);
1540                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1541                 if (rc == 0) {
1542                         QCTL_COPY(qctl, oqctl);
1543                         qctl->qc_valid = QC_OSTIDX;
1544                         qctl->obd_uuid = tgt->ltd_uuid;
1545                 }
1546                 OBD_FREE_PTR(oqctl);
1547                 break;
1548         }
1549         default: {
1550                 int set = 0;
1551
1552                 if (count == 0)
1553                         return -ENOTTY;
1554
1555                 for (i = 0; i < count; i++) {
1556                         int err;
1557                         struct obd_device *osc_obd;
1558
1559                         /* OST was disconnected */
1560                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1561                                 continue;
1562
1563                         /* ll_umount_begin() sets force flag but for lov, not
1564                          * osc. Let's pass it through */
1565                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1566                         osc_obd->obd_force = obddev->obd_force;
1567                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1568                                             len, karg, uarg);
1569                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1570                                 return err;
1571                         } else if (err) {
1572                                 if (lov->lov_tgts[i]->ltd_active) {
1573                                         CDEBUG(err == -ENOTTY ?
1574                                                D_IOCTL : D_WARNING,
1575                                                "iocontrol OSC %s on OST idx %d cmd %x: err = %d\n",
1576                                                lov_uuid2str(lov, i),
1577                                                i, cmd, err);
1578                                         if (!rc)
1579                                                 rc = err;
1580                                 }
1581                         } else {
1582                                 set = 1;
1583                         }
1584                 }
1585                 if (!set && !rc)
1586                         rc = -EIO;
1587         }
1588         }
1589
1590         return rc;
1591 }
1592
1593 #define FIEMAP_BUFFER_SIZE 4096
1594
1595 /**
1596  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1597  * call. The local end offset and the device are sent in the first
1598  * fm_extent. This function calculates the stripe number from the index.
1599  * This function returns a stripe_no on which mapping is to be restarted.
1600  *
1601  * This function returns fm_end_offset which is the in-OST offset at which
1602  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1603  * will re-calculate proper offset in next stripe.
1604  * Note that the first extent is passed to lov_get_info via the value field.
1605  *
1606  * \param fiemap fiemap request header
1607  * \param lsm striping information for the file
1608  * \param fm_start logical start of mapping
1609  * \param fm_end logical end of mapping
1610  * \param start_stripe starting stripe will be returned in this
1611  */
1612 static u64 fiemap_calc_fm_end_offset(struct ll_user_fiemap *fiemap,
1613                                      struct lov_stripe_md *lsm, u64 fm_start,
1614                                      u64 fm_end, int *start_stripe)
1615 {
1616         u64 local_end = fiemap->fm_extents[0].fe_logical;
1617         u64 lun_start, lun_end;
1618         u64 fm_end_offset;
1619         int stripe_no = -1, i;
1620
1621         if (fiemap->fm_extent_count == 0 ||
1622             fiemap->fm_extents[0].fe_logical == 0)
1623                 return 0;
1624
1625         /* Find out stripe_no from ost_index saved in the fe_device */
1626         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1627                 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
1628
1629                 if (lov_oinfo_is_dummy(oinfo))
1630                         continue;
1631
1632                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1633                         stripe_no = i;
1634                         break;
1635                 }
1636         }
1637         if (stripe_no == -1)
1638                 return -EINVAL;
1639
1640         /* If we have finished mapping on previous device, shift logical
1641          * offset to start of next device */
1642         if ((lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
1643                                    &lun_start, &lun_end)) != 0 &&
1644                                    local_end < lun_end) {
1645                 fm_end_offset = local_end;
1646                 *start_stripe = stripe_no;
1647         } else {
1648                 /* This is a special value to indicate that caller should
1649                  * calculate offset in next stripe. */
1650                 fm_end_offset = 0;
1651                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
1652         }
1653
1654         return fm_end_offset;
1655 }
1656
1657 /**
1658  * We calculate on which OST the mapping will end. If the length of mapping
1659  * is greater than (stripe_size * stripe_count) then the last_stripe will
1660  * will be one just before start_stripe. Else we check if the mapping
1661  * intersects each OST and find last_stripe.
1662  * This function returns the last_stripe and also sets the stripe_count
1663  * over which the mapping is spread
1664  *
1665  * \param lsm striping information for the file
1666  * \param fm_start logical start of mapping
1667  * \param fm_end logical end of mapping
1668  * \param start_stripe starting stripe of the mapping
1669  * \param stripe_count the number of stripes across which to map is returned
1670  *
1671  * \retval last_stripe return the last stripe of the mapping
1672  */
1673 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, u64 fm_start,
1674                                    u64 fm_end, int start_stripe,
1675                                    int *stripe_count)
1676 {
1677         int last_stripe;
1678         u64 obd_start, obd_end;
1679         int i, j;
1680
1681         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
1682                 last_stripe = start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
1683                                                               start_stripe - 1;
1684                 *stripe_count = lsm->lsm_stripe_count;
1685         } else {
1686                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
1687                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
1688                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
1689                                                    &obd_start, &obd_end)) == 0)
1690                                 break;
1691                 }
1692                 *stripe_count = j;
1693                 last_stripe = (start_stripe + j - 1) %lsm->lsm_stripe_count;
1694         }
1695
1696         return last_stripe;
1697 }
1698
1699 /**
1700  * Set fe_device and copy extents from local buffer into main return buffer.
1701  *
1702  * \param fiemap fiemap request header
1703  * \param lcl_fm_ext array of local fiemap extents to be copied
1704  * \param ost_index OST index to be written into the fm_device field for each
1705                     extent
1706  * \param ext_count number of extents to be copied
1707  * \param current_extent where to start copying in main extent array
1708  */
1709 static void fiemap_prepare_and_copy_exts(struct ll_user_fiemap *fiemap,
1710                                          struct ll_fiemap_extent *lcl_fm_ext,
1711                                          int ost_index, unsigned int ext_count,
1712                                          int current_extent)
1713 {
1714         char *to;
1715         int ext;
1716
1717         for (ext = 0; ext < ext_count; ext++) {
1718                 lcl_fm_ext[ext].fe_device = ost_index;
1719                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1720         }
1721
1722         /* Copy fm_extent's from fm_local to return buffer */
1723         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1724         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct ll_fiemap_extent));
1725 }
1726
1727 /**
1728  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1729  * This also handles the restarting of FIEMAP calls in case mapping overflows
1730  * the available number of extents in single call.
1731  */
1732 static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
1733                       __u32 *vallen, void *val, struct lov_stripe_md *lsm)
1734 {
1735         struct ll_fiemap_info_key *fm_key = key;
1736         struct ll_user_fiemap *fiemap = val;
1737         struct ll_user_fiemap *fm_local = NULL;
1738         struct ll_fiemap_extent *lcl_fm_ext;
1739         int count_local;
1740         unsigned int get_num_extents = 0;
1741         int ost_index = 0, actual_start_stripe, start_stripe;
1742         u64 fm_start, fm_end, fm_length, fm_end_offset;
1743         u64 curr_loc;
1744         int current_extent = 0, rc = 0, i;
1745         int ost_eof = 0; /* EOF for object */
1746         int ost_done = 0; /* done with required mapping for this OST? */
1747         int last_stripe;
1748         int cur_stripe = 0, cur_stripe_wrap = 0, stripe_count;
1749         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1750
1751         if (!lsm_has_objects(lsm)) {
1752                 rc = 0;
1753                 goto out;
1754         }
1755
1756         if (fiemap_count_to_size(fm_key->fiemap.fm_extent_count) < buffer_size)
1757                 buffer_size = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
1758
1759         OBD_ALLOC_LARGE(fm_local, buffer_size);
1760         if (fm_local == NULL) {
1761                 rc = -ENOMEM;
1762                 goto out;
1763         }
1764         lcl_fm_ext = &fm_local->fm_extents[0];
1765
1766         count_local = fiemap_size_to_count(buffer_size);
1767
1768         memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
1769         fm_start = fiemap->fm_start;
1770         fm_length = fiemap->fm_length;
1771         /* Calculate start stripe, last stripe and length of mapping */
1772         actual_start_stripe = start_stripe = lov_stripe_number(lsm, fm_start);
1773         fm_end = (fm_length == ~0ULL ? fm_key->oa.o_size :
1774                                                 fm_start + fm_length - 1);
1775         /* If fm_length != ~0ULL but fm_start+fm_length-1 exceeds file size */
1776         if (fm_end > fm_key->oa.o_size)
1777                 fm_end = fm_key->oa.o_size;
1778
1779         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
1780                                             actual_start_stripe, &stripe_count);
1781
1782         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start,
1783                                                   fm_end, &start_stripe);
1784         if (fm_end_offset == -EINVAL) {
1785                 rc = -EINVAL;
1786                 goto out;
1787         }
1788
1789         if (fiemap_count_to_size(fiemap->fm_extent_count) > *vallen)
1790                 fiemap->fm_extent_count = fiemap_size_to_count(*vallen);
1791         if (fiemap->fm_extent_count == 0) {
1792                 get_num_extents = 1;
1793                 count_local = 0;
1794         }
1795         /* Check each stripe */
1796         for (cur_stripe = start_stripe, i = 0; i < stripe_count;
1797              i++, cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
1798                 u64 req_fm_len; /* Stores length of required mapping */
1799                 u64 len_mapped_single_call;
1800                 u64 lun_start, lun_end, obd_object_end;
1801                 unsigned int ext_count;
1802
1803                 cur_stripe_wrap = cur_stripe;
1804
1805                 /* Find out range of mapping on this stripe */
1806                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
1807                                            &lun_start, &obd_object_end)) == 0)
1808                         continue;
1809
1810                 if (lov_oinfo_is_dummy(lsm->lsm_oinfo[cur_stripe])) {
1811                         rc = -EIO;
1812                         goto out;
1813                 }
1814
1815                 /* If this is a continuation FIEMAP call and we are on
1816                  * starting stripe then lun_start needs to be set to
1817                  * fm_end_offset */
1818                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
1819                         lun_start = fm_end_offset;
1820
1821                 if (fm_length != ~0ULL) {
1822                         /* Handle fm_start + fm_length overflow */
1823                         if (fm_start + fm_length < fm_start)
1824                                 fm_length = ~0ULL - fm_start;
1825                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
1826                                                      cur_stripe);
1827                 } else {
1828                         lun_end = ~0ULL;
1829                 }
1830
1831                 if (lun_start == lun_end)
1832                         continue;
1833
1834                 req_fm_len = obd_object_end - lun_start;
1835                 fm_local->fm_length = 0;
1836                 len_mapped_single_call = 0;
1837
1838                 /* If the output buffer is very large and the objects have many
1839                  * extents we may need to loop on a single OST repeatedly */
1840                 ost_eof = 0;
1841                 ost_done = 0;
1842                 do {
1843                         if (get_num_extents == 0) {
1844                                 /* Don't get too many extents. */
1845                                 if (current_extent + count_local >
1846                                     fiemap->fm_extent_count)
1847                                         count_local = fiemap->fm_extent_count -
1848                                                                  current_extent;
1849                         }
1850
1851                         lun_start += len_mapped_single_call;
1852                         fm_local->fm_length = req_fm_len - len_mapped_single_call;
1853                         req_fm_len = fm_local->fm_length;
1854                         fm_local->fm_extent_count = count_local;
1855                         fm_local->fm_mapped_extents = 0;
1856                         fm_local->fm_flags = fiemap->fm_flags;
1857
1858                         fm_key->oa.o_oi = lsm->lsm_oinfo[cur_stripe]->loi_oi;
1859                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
1860
1861                         if (ost_index < 0 ||
1862                             ost_index >= lov->desc.ld_tgt_count) {
1863                                 rc = -EINVAL;
1864                                 goto out;
1865                         }
1866
1867                         /* If OST is inactive, return extent with UNKNOWN flag */
1868                         if (!lov->lov_tgts[ost_index]->ltd_active) {
1869                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
1870                                 fm_local->fm_mapped_extents = 1;
1871
1872                                 lcl_fm_ext[0].fe_logical = lun_start;
1873                                 lcl_fm_ext[0].fe_length = obd_object_end -
1874                                                                       lun_start;
1875                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1876
1877                                 goto inactive_tgt;
1878                         }
1879
1880                         fm_local->fm_start = lun_start;
1881                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1882                         memcpy(&fm_key->fiemap, fm_local, sizeof(*fm_local));
1883                         *vallen=fiemap_count_to_size(fm_local->fm_extent_count);
1884                         rc = obd_get_info(NULL,
1885                                           lov->lov_tgts[ost_index]->ltd_exp,
1886                                           keylen, key, vallen, fm_local, lsm);
1887                         if (rc != 0)
1888                                 goto out;
1889
1890 inactive_tgt:
1891                         ext_count = fm_local->fm_mapped_extents;
1892                         if (ext_count == 0) {
1893                                 ost_done = 1;
1894                                 /* If last stripe has hole at the end,
1895                                  * then we need to return */
1896                                 if (cur_stripe_wrap == last_stripe) {
1897                                         fiemap->fm_mapped_extents = 0;
1898                                         goto finish;
1899                                 }
1900                                 break;
1901                         }
1902
1903                         /* If we just need num of extents then go to next device */
1904                         if (get_num_extents) {
1905                                 current_extent += ext_count;
1906                                 break;
1907                         }
1908
1909                         len_mapped_single_call = lcl_fm_ext[ext_count-1].fe_logical -
1910                                   lun_start + lcl_fm_ext[ext_count - 1].fe_length;
1911
1912                         /* Have we finished mapping on this device? */
1913                         if (req_fm_len <= len_mapped_single_call)
1914                                 ost_done = 1;
1915
1916                         /* Clear the EXTENT_LAST flag which can be present on
1917                          * last extent */
1918                         if (lcl_fm_ext[ext_count-1].fe_flags & FIEMAP_EXTENT_LAST)
1919                                 lcl_fm_ext[ext_count - 1].fe_flags &=
1920                                                             ~FIEMAP_EXTENT_LAST;
1921
1922                         curr_loc = lov_stripe_size(lsm,
1923                                            lcl_fm_ext[ext_count - 1].fe_logical+
1924                                            lcl_fm_ext[ext_count - 1].fe_length,
1925                                            cur_stripe);
1926                         if (curr_loc >= fm_key->oa.o_size)
1927                                 ost_eof = 1;
1928
1929                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
1930                                                      ost_index, ext_count,
1931                                                      current_extent);
1932
1933                         current_extent += ext_count;
1934
1935                         /* Ran out of available extents? */
1936                         if (current_extent >= fiemap->fm_extent_count)
1937                                 goto finish;
1938                 } while (ost_done == 0 && ost_eof == 0);
1939
1940                 if (cur_stripe_wrap == last_stripe)
1941                         goto finish;
1942         }
1943
1944 finish:
1945         /* Indicate that we are returning device offsets unless file just has
1946          * single stripe */
1947         if (lsm->lsm_stripe_count > 1)
1948                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1949
1950         if (get_num_extents)
1951                 goto skip_last_device_calc;
1952
1953         /* Check if we have reached the last stripe and whether mapping for that
1954          * stripe is done. */
1955         if (cur_stripe_wrap == last_stripe) {
1956                 if (ost_done || ost_eof)
1957                         fiemap->fm_extents[current_extent - 1].fe_flags |=
1958                                                              FIEMAP_EXTENT_LAST;
1959         }
1960
1961 skip_last_device_calc:
1962         fiemap->fm_mapped_extents = current_extent;
1963
1964 out:
1965         OBD_FREE_LARGE(fm_local, buffer_size);
1966         return rc;
1967 }
1968
1969 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1970                         __u32 keylen, void *key, __u32 *vallen, void *val,
1971                         struct lov_stripe_md *lsm)
1972 {
1973         struct obd_device *obddev = class_exp2obd(exp);
1974         struct lov_obd *lov = &obddev->u.lov;
1975         int i, rc;
1976
1977         if (!vallen || !val)
1978                 return -EFAULT;
1979
1980         obd_getref(obddev);
1981
1982         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
1983                 struct {
1984                         char name[16];
1985                         struct ldlm_lock *lock;
1986                 } *data = key;
1987                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
1988                 struct lov_oinfo *loi;
1989                 __u32 *stripe = val;
1990
1991                 if (*vallen < sizeof(*stripe)) {
1992                         rc = -EFAULT;
1993                         goto out;
1994                 }
1995                 *vallen = sizeof(*stripe);
1996
1997                 /* XXX This is another one of those bits that will need to
1998                  * change if we ever actually support nested LOVs.  It uses
1999                  * the lock's export to find out which stripe it is. */
2000                 /* XXX - it's assumed all the locks for deleted OSTs have
2001                  * been cancelled. Also, the export for deleted OSTs will
2002                  * be NULL and won't match the lock's export. */
2003                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
2004                         loi = lsm->lsm_oinfo[i];
2005                         if (lov_oinfo_is_dummy(loi))
2006                                 continue;
2007
2008                         if (!lov->lov_tgts[loi->loi_ost_idx])
2009                                 continue;
2010                         if (lov->lov_tgts[loi->loi_ost_idx]->ltd_exp ==
2011                             data->lock->l_conn_export &&
2012                             ostid_res_name_eq(&loi->loi_oi, res_id)) {
2013                                 *stripe = i;
2014                                 rc = 0;
2015                                 goto out;
2016                         }
2017                 }
2018                 LDLM_ERROR(data->lock, "lock on inode without such object");
2019                 dump_lsm(D_ERROR, lsm);
2020                 rc = -ENXIO;
2021                 goto out;
2022         } else if (KEY_IS(KEY_LAST_ID)) {
2023                 struct obd_id_info *info = val;
2024                 __u32 size = sizeof(u64);
2025                 struct lov_tgt_desc *tgt;
2026
2027                 LASSERT(*vallen == sizeof(struct obd_id_info));
2028                 tgt = lov->lov_tgts[info->idx];
2029
2030                 if (!tgt || !tgt->ltd_active) {
2031                         rc = -ESRCH;
2032                         goto out;
2033                 }
2034
2035                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
2036                                   &size, info->data, NULL);
2037                 rc = 0;
2038                 goto out;
2039         } else if (KEY_IS(KEY_LOVDESC)) {
2040                 struct lov_desc *desc_ret = val;
2041                 *desc_ret = lov->desc;
2042
2043                 rc = 0;
2044                 goto out;
2045         } else if (KEY_IS(KEY_FIEMAP)) {
2046                 rc = lov_fiemap(lov, keylen, key, vallen, val, lsm);
2047                 goto out;
2048         } else if (KEY_IS(KEY_CONNECT_FLAG)) {
2049                 struct lov_tgt_desc *tgt;
2050                 __u64 ost_idx = *((__u64 *)val);
2051
2052                 LASSERT(*vallen == sizeof(__u64));
2053                 LASSERT(ost_idx < lov->desc.ld_tgt_count);
2054                 tgt = lov->lov_tgts[ost_idx];
2055
2056                 if (!tgt || !tgt->ltd_exp) {
2057                         rc = -ESRCH;
2058                         goto out;
2059                 }
2060
2061                 *((__u64 *)val) = exp_connect_flags(tgt->ltd_exp);
2062                 rc = 0;
2063                 goto out;
2064         } else if (KEY_IS(KEY_TGT_COUNT)) {
2065                 *((int *)val) = lov->desc.ld_tgt_count;
2066                 rc = 0;
2067                 goto out;
2068         }
2069
2070         rc = -EINVAL;
2071
2072 out:
2073         obd_putref(obddev);
2074         return rc;
2075 }
2076
2077 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
2078                               u32 keylen, void *key, u32 vallen,
2079                               void *val, struct ptlrpc_request_set *set)
2080 {
2081         struct obd_device *obddev = class_exp2obd(exp);
2082         struct lov_obd *lov = &obddev->u.lov;
2083         u32 count;
2084         int i, rc = 0, err;
2085         struct lov_tgt_desc *tgt;
2086         unsigned incr, check_uuid,
2087                  do_inactive, no_set;
2088         unsigned next_id = 0,  mds_con = 0, capa = 0;
2089
2090         incr = check_uuid = do_inactive = no_set = 0;
2091         if (set == NULL) {
2092                 no_set = 1;
2093                 set = ptlrpc_prep_set();
2094                 if (!set)
2095                         return -ENOMEM;
2096         }
2097
2098         obd_getref(obddev);
2099         count = lov->desc.ld_tgt_count;
2100
2101         if (KEY_IS(KEY_NEXT_ID)) {
2102                 count = vallen / sizeof(struct obd_id_info);
2103                 vallen = sizeof(u64);
2104                 incr = sizeof(struct obd_id_info);
2105                 do_inactive = 1;
2106                 next_id = 1;
2107         } else if (KEY_IS(KEY_CHECKSUM)) {
2108                 do_inactive = 1;
2109         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2110                 /* use defaults:  do_inactive = incr = 0; */
2111         } else if (KEY_IS(KEY_MDS_CONN)) {
2112                 mds_con = 1;
2113         } else if (KEY_IS(KEY_CAPA_KEY)) {
2114                 capa = 1;
2115         } else if (KEY_IS(KEY_CACHE_SET)) {
2116                 LASSERT(lov->lov_cache == NULL);
2117                 lov->lov_cache = val;
2118                 do_inactive = 1;
2119         }
2120
2121         for (i = 0; i < count; i++, val = (char *)val + incr) {
2122                 if (next_id) {
2123                         tgt = lov->lov_tgts[((struct obd_id_info *)val)->idx];
2124                 } else {
2125                         tgt = lov->lov_tgts[i];
2126                 }
2127                 /* OST was disconnected */
2128                 if (!tgt || !tgt->ltd_exp)
2129                         continue;
2130
2131                 /* OST is inactive and we don't want inactive OSCs */
2132                 if (!tgt->ltd_active && !do_inactive)
2133                         continue;
2134
2135                 if (mds_con) {
2136                         struct mds_group_info *mgi;
2137
2138                         LASSERT(vallen == sizeof(*mgi));
2139                         mgi = (struct mds_group_info *)val;
2140
2141                         /* Only want a specific OSC */
2142                         if (mgi->uuid && !obd_uuid_equals(mgi->uuid,
2143                                                 &tgt->ltd_uuid))
2144                                 continue;
2145
2146                         err = obd_set_info_async(env, tgt->ltd_exp,
2147                                          keylen, key, sizeof(int),
2148                                          &mgi->group, set);
2149                 } else if (next_id) {
2150                         err = obd_set_info_async(env, tgt->ltd_exp,
2151                                          keylen, key, vallen,
2152                                          ((struct obd_id_info *)val)->data, set);
2153                 } else if (capa) {
2154                         struct mds_capa_info *info = (struct mds_capa_info *)val;
2155
2156                         LASSERT(vallen == sizeof(*info));
2157
2158                          /* Only want a specific OSC */
2159                         if (info->uuid &&
2160                             !obd_uuid_equals(info->uuid, &tgt->ltd_uuid))
2161                                 continue;
2162
2163                         err = obd_set_info_async(env, tgt->ltd_exp, keylen,
2164                                                  key, sizeof(*info->capa),
2165                                                  info->capa, set);
2166                 } else {
2167                         /* Only want a specific OSC */
2168                         if (check_uuid &&
2169                             !obd_uuid_equals(val, &tgt->ltd_uuid))
2170                                 continue;
2171
2172                         err = obd_set_info_async(env, tgt->ltd_exp,
2173                                          keylen, key, vallen, val, set);
2174                 }
2175
2176                 if (!rc)
2177                         rc = err;
2178         }
2179
2180         obd_putref(obddev);
2181         if (no_set) {
2182                 err = ptlrpc_set_wait(set);
2183                 if (!rc)
2184                         rc = err;
2185                 ptlrpc_set_destroy(set);
2186         }
2187         return rc;
2188 }
2189
2190 void lov_stripe_lock(struct lov_stripe_md *md)
2191                 __acquires(&md->lsm_lock)
2192 {
2193         LASSERT(md->lsm_lock_owner != current_pid());
2194         spin_lock(&md->lsm_lock);
2195         LASSERT(md->lsm_lock_owner == 0);
2196         md->lsm_lock_owner = current_pid();
2197 }
2198 EXPORT_SYMBOL(lov_stripe_lock);
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 EXPORT_SYMBOL(lov_stripe_unlock);
2208
2209 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
2210                         struct obd_quotactl *oqctl)
2211 {
2212         struct lov_obd      *lov = &obd->u.lov;
2213         struct lov_tgt_desc *tgt;
2214         __u64           curspace = 0;
2215         __u64           bhardlimit = 0;
2216         int               i, rc = 0;
2217
2218         if (oqctl->qc_cmd != LUSTRE_Q_QUOTAON &&
2219             oqctl->qc_cmd != LUSTRE_Q_QUOTAOFF &&
2220             oqctl->qc_cmd != Q_GETOQUOTA &&
2221             oqctl->qc_cmd != Q_INITQUOTA &&
2222             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA &&
2223             oqctl->qc_cmd != Q_FINVALIDATE) {
2224                 CERROR("bad quota opc %x for lov obd", oqctl->qc_cmd);
2225                 return -EFAULT;
2226         }
2227
2228         /* for lov tgt */
2229         obd_getref(obd);
2230         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2231                 int err;
2232
2233                 tgt = lov->lov_tgts[i];
2234
2235                 if (!tgt)
2236                         continue;
2237
2238                 if (!tgt->ltd_active || tgt->ltd_reap) {
2239                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
2240                             lov->lov_tgts[i]->ltd_activate) {
2241                                 rc = -EREMOTEIO;
2242                                 CERROR("ost %d is inactive\n", i);
2243                         } else {
2244                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
2245                         }
2246                         continue;
2247                 }
2248
2249                 err = obd_quotactl(tgt->ltd_exp, oqctl);
2250                 if (err) {
2251                         if (tgt->ltd_active && !rc)
2252                                 rc = err;
2253                         continue;
2254                 }
2255
2256                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
2257                         curspace += oqctl->qc_dqblk.dqb_curspace;
2258                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
2259                 }
2260         }
2261         obd_putref(obd);
2262
2263         if (oqctl->qc_cmd == Q_GETOQUOTA) {
2264                 oqctl->qc_dqblk.dqb_curspace = curspace;
2265                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
2266         }
2267         return rc;
2268 }
2269
2270 static int lov_quotacheck(struct obd_device *obd, struct obd_export *exp,
2271                           struct obd_quotactl *oqctl)
2272 {
2273         struct lov_obd *lov = &obd->u.lov;
2274         int          i, rc = 0;
2275
2276         obd_getref(obd);
2277
2278         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2279                 if (!lov->lov_tgts[i])
2280                         continue;
2281
2282                 /* Skip quota check on the administratively disabled OSTs. */
2283                 if (!lov->lov_tgts[i]->ltd_activate) {
2284                         CWARN("lov idx %d was administratively disabled, skip quotacheck on it.\n",
2285                               i);
2286                         continue;
2287                 }
2288
2289                 if (!lov->lov_tgts[i]->ltd_active) {
2290                         CERROR("lov idx %d inactive\n", i);
2291                         rc = -EIO;
2292                         goto out;
2293                 }
2294         }
2295
2296         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2297                 int err;
2298
2299                 if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_activate)
2300                         continue;
2301
2302                 err = obd_quotacheck(lov->lov_tgts[i]->ltd_exp, oqctl);
2303                 if (err && !rc)
2304                         rc = err;
2305         }
2306
2307 out:
2308         obd_putref(obd);
2309
2310         return rc;
2311 }
2312
2313 static struct obd_ops lov_obd_ops = {
2314         .o_owner               = THIS_MODULE,
2315         .o_setup               = lov_setup,
2316         .o_precleanup     = lov_precleanup,
2317         .o_cleanup           = lov_cleanup,
2318         /*.o_process_config      = lov_process_config,*/
2319         .o_connect           = lov_connect,
2320         .o_disconnect     = lov_disconnect,
2321         .o_statfs             = lov_statfs,
2322         .o_statfs_async = lov_statfs_async,
2323         .o_packmd             = lov_packmd,
2324         .o_unpackmd         = lov_unpackmd,
2325         .o_create             = lov_create,
2326         .o_destroy           = lov_destroy,
2327         .o_getattr_async       = lov_getattr_async,
2328         .o_setattr_async       = lov_setattr_async,
2329         .o_adjust_kms     = lov_adjust_kms,
2330         .o_find_cbdata   = lov_find_cbdata,
2331         .o_iocontrol       = lov_iocontrol,
2332         .o_get_info         = lov_get_info,
2333         .o_set_info_async      = lov_set_info_async,
2334         .o_notify             = lov_notify,
2335         .o_pool_new         = lov_pool_new,
2336         .o_pool_rem         = lov_pool_remove,
2337         .o_pool_add         = lov_pool_add,
2338         .o_pool_del         = lov_pool_del,
2339         .o_getref             = lov_getref,
2340         .o_putref             = lov_putref,
2341         .o_quotactl         = lov_quotactl,
2342         .o_quotacheck     = lov_quotacheck,
2343 };
2344
2345 struct kmem_cache *lov_oinfo_slab;
2346
2347 static int __init lov_init(void)
2348 {
2349         struct lprocfs_static_vars lvars = { NULL };
2350         int rc;
2351
2352         /* print an address of _any_ initialized kernel symbol from this
2353          * module, to allow debugging with gdb that doesn't support data
2354          * symbols from modules.*/
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 == NULL) {
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, lvars.module_vars,
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("Sun Microsystems, Inc. <http://www.lustre.org/>");
2390 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
2391 MODULE_LICENSE("GPL");
2392 MODULE_VERSION(LUSTRE_VERSION_STRING);
2393
2394 module_init(lov_init);
2395 module_exit(lov_exit);