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                 newtgts = kcalloc(newsize, sizeof(*newtgts), GFP_NOFS);
 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                         kfree(old);
 575
 576                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
 577                        lov->lov_tgts, lov->lov_tgt_size);
 578         }
 579
 580         tgt = kzalloc(sizeof(*tgt), GFP_NOFS);
 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                 kfree(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         kfree(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                 kfree(lov->lov_tgts);
 907                 lov->lov_tgt_size = 0;
 908         }
 909         return 0;
 910 }
 911
 912 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 913                             __u32 *indexp, int *genp)
 914 {
 915         struct obd_uuid obd_uuid;
 916         int cmd;
 917         int rc = 0;
 918
 919         switch (cmd = lcfg->lcfg_command) {
 920         case LCFG_LOV_ADD_OBD:
 921         case LCFG_LOV_ADD_INA:
 922         case LCFG_LOV_DEL_OBD: {
 923                 __u32 index;
 924                 int gen;
 925                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
 926                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid)) {
 927                         rc = -EINVAL;
 928                         goto out;
 929                 }
 930
 931                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
 932
 933                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", indexp) != 1) {
 934                         rc = -EINVAL;
 935                         goto out;
 936                 }
 937                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1) {
 938                         rc = -EINVAL;
 939                         goto out;
 940                 }
 941                 index = *indexp;
 942                 gen = *genp;
 943                 if (cmd == LCFG_LOV_ADD_OBD)
 944                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
 945                 else if (cmd == LCFG_LOV_ADD_INA)
 946                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
 947                 else
 948                         rc = lov_del_target(obd, index, &obd_uuid, gen);
 949                 goto out;
 950         }
 951         case LCFG_PARAM: {
 952                 struct lprocfs_static_vars lvars = { NULL };
 953                 struct lov_desc *desc = &(obd->u.lov.desc);
 954
 955                 if (!desc) {
 956                         rc = -EINVAL;
 957                         goto out;
 958                 }
 959
 960                 lprocfs_lov_init_vars(&lvars);
 961
 962                 rc = class_process_proc_param(PARAM_LOV, lvars.obd_vars,
 963                                               lcfg, obd);
 964                 if (rc > 0)
 965                         rc = 0;
 966                 goto out;
 967         }
 968         case LCFG_POOL_NEW:
 969         case LCFG_POOL_ADD:
 970         case LCFG_POOL_DEL:
 971         case LCFG_POOL_REM:
 972                 goto out;
 973
 974         default: {
 975                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 976                 rc = -EINVAL;
 977                 goto out;
 978
 979         }
 980         }
 981 out:
 982         return rc;
 983 }
 984
 985 static int lov_recreate(struct obd_export *exp, struct obdo *src_oa,
 986                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
 987 {
 988         struct lov_stripe_md *obj_mdp, *lsm;
 989         struct lov_obd *lov = &exp->exp_obd->u.lov;
 990         unsigned ost_idx;
 991         int rc, i;
 992
 993         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 994                 src_oa->o_flags & OBD_FL_RECREATE_OBJS);
 995
 996         obj_mdp = kzalloc(sizeof(*obj_mdp), GFP_NOFS);
 997         if (obj_mdp == NULL)
 998                 return -ENOMEM;
 999
1000         ost_idx = src_oa->o_nlink;
1001         lsm = *ea;
1002         if (lsm == NULL) {
1003                 rc = -EINVAL;
1004                 goto out;
1005         }
1006         if (ost_idx >= lov->desc.ld_tgt_count ||
1007             !lov->lov_tgts[ost_idx]) {
1008                 rc = -EINVAL;
1009                 goto out;
1010         }
1011
1012         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1013                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1014
1015                 if (lov_oinfo_is_dummy(loi))
1016                         continue;
1017
1018                 if (loi->loi_ost_idx == ost_idx) {
1019                         if (ostid_id(&loi->loi_oi) != ostid_id(&src_oa->o_oi)) {
1020                                 rc = -EINVAL;
1021                                 goto out;
1022                         }
1023                         break;
1024                 }
1025         }
1026         if (i == lsm->lsm_stripe_count) {
1027                 rc = -EINVAL;
1028                 goto out;
1029         }
1030
1031         rc = obd_create(NULL, lov->lov_tgts[ost_idx]->ltd_exp,
1032                         src_oa, &obj_mdp, oti);
1033 out:
1034         kfree(obj_mdp);
1035         return rc;
1036 }
1037
1038 /* the LOV expects oa->o_id to be set to the LOV object id */
1039 static int lov_create(const struct lu_env *env, struct obd_export *exp,
1040                       struct obdo *src_oa, struct lov_stripe_md **ea,
1041                       struct obd_trans_info *oti)
1042 {
1043         struct lov_obd *lov;
1044         int rc = 0;
1045
1046         LASSERT(ea != NULL);
1047         if (exp == NULL)
1048                 return -EINVAL;
1049
1050         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1051             src_oa->o_flags == OBD_FL_DELORPHAN) {
1052                 /* should be used with LOV anymore */
1053                 LBUG();
1054         }
1055
1056         lov = &exp->exp_obd->u.lov;
1057         if (!lov->desc.ld_active_tgt_count)
1058                 return -EIO;
1059
1060         obd_getref(exp->exp_obd);
1061         /* Recreate a specific object id at the given OST index */
1062         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
1063             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
1064                  rc = lov_recreate(exp, src_oa, ea, oti);
1065         }
1066
1067         obd_putref(exp->exp_obd);
1068         return rc;
1069 }
1070
1071 #define ASSERT_LSM_MAGIC(lsmp)                                            \
1072 do {                                                                        \
1073         LASSERT((lsmp) != NULL);                                                \
1074         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                    \
1075                  (lsmp)->lsm_magic == LOV_MAGIC_V3),                        \
1076                  "%p->lsm_magic=%x\n", (lsmp), (lsmp)->lsm_magic);            \
1077 } while (0)
1078
1079 static int lov_destroy(const struct lu_env *env, struct obd_export *exp,
1080                        struct obdo *oa, struct lov_stripe_md *lsm,
1081                        struct obd_trans_info *oti, struct obd_export *md_exp,
1082                        void *capa)
1083 {
1084         struct lov_request_set *set;
1085         struct obd_info oinfo;
1086         struct lov_request *req;
1087         struct list_head *pos;
1088         struct lov_obd *lov;
1089         int rc = 0, err = 0;
1090
1091         ASSERT_LSM_MAGIC(lsm);
1092
1093         if (!exp || !exp->exp_obd)
1094                 return -ENODEV;
1095
1096         if (oa->o_valid & OBD_MD_FLCOOKIE) {
1097                 LASSERT(oti);
1098                 LASSERT(oti->oti_logcookies);
1099         }
1100
1101         lov = &exp->exp_obd->u.lov;
1102         obd_getref(exp->exp_obd);
1103         rc = lov_prep_destroy_set(exp, &oinfo, oa, lsm, oti, &set);
1104         if (rc)
1105                 goto out;
1106
1107         list_for_each(pos, &set->set_list) {
1108                 req = list_entry(pos, struct lov_request, rq_link);
1109
1110                 if (oa->o_valid & OBD_MD_FLCOOKIE)
1111                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1112
1113                 err = obd_destroy(env, lov->lov_tgts[req->rq_idx]->ltd_exp,
1114                                   req->rq_oi.oi_oa, NULL, oti, NULL, capa);
1115                 err = lov_update_common_set(set, req, err);
1116                 if (err) {
1117                         CERROR("%s: destroying objid "DOSTID" subobj "
1118                                DOSTID" on OST idx %d: rc = %d\n",
1119                                exp->exp_obd->obd_name, POSTID(&oa->o_oi),
1120                                POSTID(&req->rq_oi.oi_oa->o_oi),
1121                                req->rq_idx, err);
1122                         if (!rc)
1123                                 rc = err;
1124                 }
1125         }
1126
1127         if (rc == 0) {
1128                 LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
1129                 rc = lsm_op_find(lsm->lsm_magic)->lsm_destroy(lsm, oa, md_exp);
1130         }
1131         err = lov_fini_destroy_set(set);
1132 out:
1133         obd_putref(exp->exp_obd);
1134         return rc ? rc : err;
1135 }
1136
1137 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset,
1138                                  void *data, int rc)
1139 {
1140         struct lov_request_set *lovset = (struct lov_request_set *)data;
1141         int err;
1142
1143         /* don't do attribute merge if this async op failed */
1144         if (rc)
1145                 atomic_set(&lovset->set_completes, 0);
1146         err = lov_fini_getattr_set(lovset);
1147         return rc ? rc : err;
1148 }
1149
1150 static int lov_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
1151                               struct ptlrpc_request_set *rqset)
1152 {
1153         struct lov_request_set *lovset;
1154         struct lov_obd *lov;
1155         struct list_head *pos;
1156         struct lov_request *req;
1157         int rc = 0, err;
1158
1159         LASSERT(oinfo);
1160         ASSERT_LSM_MAGIC(oinfo->oi_md);
1161
1162         if (!exp || !exp->exp_obd)
1163                 return -ENODEV;
1164
1165         lov = &exp->exp_obd->u.lov;
1166
1167         rc = lov_prep_getattr_set(exp, oinfo, &lovset);
1168         if (rc)
1169                 return rc;
1170
1171         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1172                POSTID(&oinfo->oi_md->lsm_oi), oinfo->oi_md->lsm_stripe_count,
1173                oinfo->oi_md->lsm_stripe_size);
1174
1175         list_for_each(pos, &lovset->set_list) {
1176                 req = list_entry(pos, struct lov_request, rq_link);
1177
1178                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1179                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1180                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1181                 rc = obd_getattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1182                                        &req->rq_oi, rqset);
1183                 if (rc) {
1184                         CERROR("%s: getattr objid "DOSTID" subobj"
1185                                DOSTID" on OST idx %d: rc = %d\n",
1186                                exp->exp_obd->obd_name,
1187                                POSTID(&oinfo->oi_oa->o_oi),
1188                                POSTID(&req->rq_oi.oi_oa->o_oi),
1189                                req->rq_idx, rc);
1190                         goto out;
1191                 }
1192         }
1193
1194         if (!list_empty(&rqset->set_requests)) {
1195                 LASSERT(rc == 0);
1196                 LASSERT(rqset->set_interpret == NULL);
1197                 rqset->set_interpret = lov_getattr_interpret;
1198                 rqset->set_arg = (void *)lovset;
1199                 return rc;
1200         }
1201 out:
1202         if (rc)
1203                 atomic_set(&lovset->set_completes, 0);
1204         err = lov_fini_getattr_set(lovset);
1205         return rc ? rc : err;
1206 }
1207
1208 static int lov_setattr_interpret(struct ptlrpc_request_set *rqset,
1209                                  void *data, int rc)
1210 {
1211         struct lov_request_set *lovset = (struct lov_request_set *)data;
1212         int err;
1213
1214         if (rc)
1215                 atomic_set(&lovset->set_completes, 0);
1216         err = lov_fini_setattr_set(lovset);
1217         return rc ? rc : err;
1218 }
1219
1220 /* If @oti is given, the request goes from MDS and responses from OSTs are not
1221    needed. Otherwise, a client is waiting for responses. */
1222 static int lov_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
1223                              struct obd_trans_info *oti,
1224                              struct ptlrpc_request_set *rqset)
1225 {
1226         struct lov_request_set *set;
1227         struct lov_request *req;
1228         struct list_head *pos;
1229         struct lov_obd *lov;
1230         int rc = 0;
1231
1232         LASSERT(oinfo);
1233         ASSERT_LSM_MAGIC(oinfo->oi_md);
1234         if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE) {
1235                 LASSERT(oti);
1236                 LASSERT(oti->oti_logcookies);
1237         }
1238
1239         if (!exp || !exp->exp_obd)
1240                 return -ENODEV;
1241
1242         lov = &exp->exp_obd->u.lov;
1243         rc = lov_prep_setattr_set(exp, oinfo, oti, &set);
1244         if (rc)
1245                 return rc;
1246
1247         CDEBUG(D_INFO, "objid "DOSTID": %ux%u byte stripes\n",
1248                POSTID(&oinfo->oi_md->lsm_oi),
1249                oinfo->oi_md->lsm_stripe_count,
1250                oinfo->oi_md->lsm_stripe_size);
1251
1252         list_for_each(pos, &set->set_list) {
1253                 req = list_entry(pos, struct lov_request, rq_link);
1254
1255                 if (oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
1256                         oti->oti_logcookies = set->set_cookies + req->rq_stripe;
1257
1258                 CDEBUG(D_INFO, "objid " DOSTID "[%d] has subobj " DOSTID " at idx%u\n",
1259                        POSTID(&oinfo->oi_oa->o_oi), req->rq_stripe,
1260                        POSTID(&req->rq_oi.oi_oa->o_oi), req->rq_idx);
1261
1262                 rc = obd_setattr_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1263                                        &req->rq_oi, oti, rqset);
1264                 if (rc) {
1265                         CERROR("error: setattr objid "DOSTID" subobj"
1266                                DOSTID" on OST idx %d: rc = %d\n",
1267                                POSTID(&set->set_oi->oi_oa->o_oi),
1268                                POSTID(&req->rq_oi.oi_oa->o_oi),
1269                                req->rq_idx, rc);
1270                         break;
1271                 }
1272         }
1273
1274         /* If we are not waiting for responses on async requests, return. */
1275         if (rc || !rqset || list_empty(&rqset->set_requests)) {
1276                 int err;
1277                 if (rc)
1278                         atomic_set(&set->set_completes, 0);
1279                 err = lov_fini_setattr_set(set);
1280                 return rc ? rc : err;
1281         }
1282
1283         LASSERT(rqset->set_interpret == NULL);
1284         rqset->set_interpret = lov_setattr_interpret;
1285         rqset->set_arg = (void *)set;
1286
1287         return 0;
1288 }
1289
1290 /* find any ldlm lock of the inode in lov
1291  * return 0    not find
1292  *      1    find one
1293  *      < 0    error */
1294 static int lov_find_cbdata(struct obd_export *exp,
1295                            struct lov_stripe_md *lsm, ldlm_iterator_t it,
1296                            void *data)
1297 {
1298         struct lov_obd *lov;
1299         int rc = 0, i;
1300
1301         ASSERT_LSM_MAGIC(lsm);
1302
1303         if (!exp || !exp->exp_obd)
1304                 return -ENODEV;
1305
1306         lov = &exp->exp_obd->u.lov;
1307         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1308                 struct lov_stripe_md submd;
1309                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1310
1311                 if (lov_oinfo_is_dummy(loi))
1312                         continue;
1313
1314                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
1315                         CDEBUG(D_HA, "lov idx %d NULL\n", loi->loi_ost_idx);
1316                         continue;
1317                 }
1318
1319                 submd.lsm_oi = loi->loi_oi;
1320                 submd.lsm_stripe_count = 0;
1321                 rc = obd_find_cbdata(lov->lov_tgts[loi->loi_ost_idx]->ltd_exp,
1322                                      &submd, it, data);
1323                 if (rc != 0)
1324                         return rc;
1325         }
1326         return rc;
1327 }
1328
1329 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1330 {
1331         struct lov_request_set *lovset = (struct lov_request_set *)data;
1332         int err;
1333
1334         if (rc)
1335                 atomic_set(&lovset->set_completes, 0);
1336
1337         err = lov_fini_statfs_set(lovset);
1338         return rc ? rc : err;
1339 }
1340
1341 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
1342                             __u64 max_age, struct ptlrpc_request_set *rqset)
1343 {
1344         struct obd_device      *obd = class_exp2obd(exp);
1345         struct lov_request_set *set;
1346         struct lov_request *req;
1347         struct list_head *pos;
1348         struct lov_obd *lov;
1349         int rc = 0;
1350
1351         LASSERT(oinfo != NULL);
1352         LASSERT(oinfo->oi_osfs != NULL);
1353
1354         lov = &obd->u.lov;
1355         rc = lov_prep_statfs_set(obd, oinfo, &set);
1356         if (rc)
1357                 return rc;
1358
1359         list_for_each(pos, &set->set_list) {
1360                 req = list_entry(pos, struct lov_request, rq_link);
1361                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1362                                       &req->rq_oi, max_age, rqset);
1363                 if (rc)
1364                         break;
1365         }
1366
1367         if (rc || list_empty(&rqset->set_requests)) {
1368                 int err;
1369                 if (rc)
1370                         atomic_set(&set->set_completes, 0);
1371                 err = lov_fini_statfs_set(set);
1372                 return rc ? rc : err;
1373         }
1374
1375         LASSERT(rqset->set_interpret == NULL);
1376         rqset->set_interpret = lov_statfs_interpret;
1377         rqset->set_arg = (void *)set;
1378         return 0;
1379 }
1380
1381 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1382                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1383 {
1384         struct ptlrpc_request_set *set = NULL;
1385         struct obd_info oinfo = { { { 0 } } };
1386         int rc = 0;
1387
1388         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1389          * statfs requests */
1390         set = ptlrpc_prep_set();
1391         if (set == NULL)
1392                 return -ENOMEM;
1393
1394         oinfo.oi_osfs = osfs;
1395         oinfo.oi_flags = flags;
1396         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1397         if (rc == 0)
1398                 rc = ptlrpc_set_wait(set);
1399         ptlrpc_set_destroy(set);
1400
1401         return rc;
1402 }
1403
1404 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1405                          void *karg, void *uarg)
1406 {
1407         struct obd_device *obddev = class_exp2obd(exp);
1408         struct lov_obd *lov = &obddev->u.lov;
1409         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1410         struct obd_uuid *uuidp;
1411
1412         switch (cmd) {
1413         case IOC_OBD_STATFS: {
1414                 struct obd_ioctl_data *data = karg;
1415                 struct obd_device *osc_obd;
1416                 struct obd_statfs stat_buf = {0};
1417                 __u32 index;
1418                 __u32 flags;
1419
1420                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1421                 if ((index >= count))
1422                         return -ENODEV;
1423
1424                 if (!lov->lov_tgts[index])
1425                         /* Try again with the next index */
1426                         return -EAGAIN;
1427                 if (!lov->lov_tgts[index]->ltd_active)
1428                         return -ENODATA;
1429
1430                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1431                 if (!osc_obd)
1432                         return -EINVAL;
1433
1434                 /* copy UUID */
1435                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1436                                      min((int) data->ioc_plen2,
1437                                          (int) sizeof(struct obd_uuid))))
1438                         return -EFAULT;
1439
1440                 flags = uarg ? *(__u32 *)uarg : 0;
1441                 /* got statfs data */
1442                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1443                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1444                                 flags);
1445                 if (rc)
1446                         return rc;
1447                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1448                                      min((int) data->ioc_plen1,
1449                                          (int) sizeof(stat_buf))))
1450                         return -EFAULT;
1451                 break;
1452         }
1453         case OBD_IOC_LOV_GET_CONFIG: {
1454                 struct obd_ioctl_data *data;
1455                 struct lov_desc *desc;
1456                 char *buf = NULL;
1457                 __u32 *genp;
1458
1459                 len = 0;
1460                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
1461                         return -EINVAL;
1462
1463                 data = (struct obd_ioctl_data *)buf;
1464
1465                 if (sizeof(*desc) > data->ioc_inllen1) {
1466                         obd_ioctl_freedata(buf, len);
1467                         return -EINVAL;
1468                 }
1469
1470                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1471                         obd_ioctl_freedata(buf, len);
1472                         return -EINVAL;
1473                 }
1474
1475                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1476                         obd_ioctl_freedata(buf, len);
1477                         return -EINVAL;
1478                 }
1479
1480                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1481                 memcpy(desc, &(lov->desc), sizeof(*desc));
1482
1483                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1484                 genp = (__u32 *)data->ioc_inlbuf3;
1485                 /* the uuid will be empty for deleted OSTs */
1486                 for (i = 0; i < count; i++, uuidp++, genp++) {
1487                         if (!lov->lov_tgts[i])
1488                                 continue;
1489                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1490                         *genp = lov->lov_tgts[i]->ltd_gen;
1491                 }
1492
1493                 if (copy_to_user((void *)uarg, buf, len))
1494                         rc = -EFAULT;
1495                 obd_ioctl_freedata(buf, len);
1496                 break;
1497         }
1498         case LL_IOC_LOV_GETSTRIPE:
1499                 rc = lov_getstripe(exp, karg, uarg);
1500                 break;
1501         case OBD_IOC_QUOTACTL: {
1502                 struct if_quotactl *qctl = karg;
1503                 struct lov_tgt_desc *tgt = NULL;
1504                 struct obd_quotactl *oqctl;
1505
1506                 if (qctl->qc_valid == QC_OSTIDX) {
1507                         if (qctl->qc_idx < 0 || count <= qctl->qc_idx)
1508                                 return -EINVAL;
1509
1510                         tgt = lov->lov_tgts[qctl->qc_idx];
1511                         if (!tgt || !tgt->ltd_exp)
1512                                 return -EINVAL;
1513                 } else if (qctl->qc_valid == QC_UUID) {
1514                         for (i = 0; i < count; i++) {
1515                                 tgt = lov->lov_tgts[i];
1516                                 if (!tgt ||
1517                                     !obd_uuid_equals(&tgt->ltd_uuid,
1518                                                      &qctl->obd_uuid))
1519                                         continue;
1520
1521                                 if (tgt->ltd_exp == NULL)
1522                                         return -EINVAL;
1523
1524                                 break;
1525                         }
1526                 } else {
1527                         return -EINVAL;
1528                 }
1529
1530                 if (i >= count)
1531                         return -EAGAIN;
1532
1533                 LASSERT(tgt && tgt->ltd_exp);
1534                 oqctl = kzalloc(sizeof(*oqctl), GFP_NOFS);
1535                 if (!oqctl)
1536                         return -ENOMEM;
1537
1538                 QCTL_COPY(oqctl, qctl);
1539                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1540                 if (rc == 0) {
1541                         QCTL_COPY(qctl, oqctl);
1542                         qctl->qc_valid = QC_OSTIDX;
1543                         qctl->obd_uuid = tgt->ltd_uuid;
1544                 }
1545                 kfree(oqctl);
1546                 break;
1547         }
1548         default: {
1549                 int set = 0;
1550
1551                 if (count == 0)
1552                         return -ENOTTY;
1553
1554                 for (i = 0; i < count; i++) {
1555                         int err;
1556                         struct obd_device *osc_obd;
1557
1558                         /* OST was disconnected */
1559                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1560                                 continue;
1561
1562                         /* ll_umount_begin() sets force flag but for lov, not
1563                          * osc. Let's pass it through */
1564                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1565                         osc_obd->obd_force = obddev->obd_force;
1566                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1567                                             len, karg, uarg);
1568                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1569                                 return err;
1570                         } else if (err) {
1571                                 if (lov->lov_tgts[i]->ltd_active) {
1572                                         CDEBUG(err == -ENOTTY ?
1573                                                D_IOCTL : D_WARNING,
1574                                                "iocontrol OSC %s on OST idx %d cmd %x: err = %d\n",
1575                                                lov_uuid2str(lov, i),
1576                                                i, cmd, err);
1577                                         if (!rc)
1578                                                 rc = err;
1579                                 }
1580                         } else {
1581                                 set = 1;
1582                         }
1583                 }
1584                 if (!set && !rc)
1585                         rc = -EIO;
1586         }
1587         }
1588
1589         return rc;
1590 }
1591
1592 #define FIEMAP_BUFFER_SIZE 4096
1593
1594 /**
1595  * Non-zero fe_logical indicates that this is a continuation FIEMAP
1596  * call. The local end offset and the device are sent in the first
1597  * fm_extent. This function calculates the stripe number from the index.
1598  * This function returns a stripe_no on which mapping is to be restarted.
1599  *
1600  * This function returns fm_end_offset which is the in-OST offset at which
1601  * mapping should be restarted. If fm_end_offset=0 is returned then caller
1602  * will re-calculate proper offset in next stripe.
1603  * Note that the first extent is passed to lov_get_info via the value field.
1604  *
1605  * \param fiemap fiemap request header
1606  * \param lsm striping information for the file
1607  * \param fm_start logical start of mapping
1608  * \param fm_end logical end of mapping
1609  * \param start_stripe starting stripe will be returned in this
1610  */
1611 static u64 fiemap_calc_fm_end_offset(struct ll_user_fiemap *fiemap,
1612                                      struct lov_stripe_md *lsm, u64 fm_start,
1613                                      u64 fm_end, int *start_stripe)
1614 {
1615         u64 local_end = fiemap->fm_extents[0].fe_logical;
1616         u64 lun_start, lun_end;
1617         u64 fm_end_offset;
1618         int stripe_no = -1, i;
1619
1620         if (fiemap->fm_extent_count == 0 ||
1621             fiemap->fm_extents[0].fe_logical == 0)
1622                 return 0;
1623
1624         /* Find out stripe_no from ost_index saved in the fe_device */
1625         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1626                 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
1627
1628                 if (lov_oinfo_is_dummy(oinfo))
1629                         continue;
1630
1631                 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1632                         stripe_no = i;
1633                         break;
1634                 }
1635         }
1636         if (stripe_no == -1)
1637                 return -EINVAL;
1638
1639         /* If we have finished mapping on previous device, shift logical
1640          * offset to start of next device */
1641         if ((lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
1642                                    &lun_start, &lun_end)) != 0 &&
1643                                    local_end < lun_end) {
1644                 fm_end_offset = local_end;
1645                 *start_stripe = stripe_no;
1646         } else {
1647                 /* This is a special value to indicate that caller should
1648                  * calculate offset in next stripe. */
1649                 fm_end_offset = 0;
1650                 *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
1651         }
1652
1653         return fm_end_offset;
1654 }
1655
1656 /**
1657  * We calculate on which OST the mapping will end. If the length of mapping
1658  * is greater than (stripe_size * stripe_count) then the last_stripe will
1659  * will be one just before start_stripe. Else we check if the mapping
1660  * intersects each OST and find last_stripe.
1661  * This function returns the last_stripe and also sets the stripe_count
1662  * over which the mapping is spread
1663  *
1664  * \param lsm striping information for the file
1665  * \param fm_start logical start of mapping
1666  * \param fm_end logical end of mapping
1667  * \param start_stripe starting stripe of the mapping
1668  * \param stripe_count the number of stripes across which to map is returned
1669  *
1670  * \retval last_stripe return the last stripe of the mapping
1671  */
1672 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, u64 fm_start,
1673                                    u64 fm_end, int start_stripe,
1674                                    int *stripe_count)
1675 {
1676         int last_stripe;
1677         u64 obd_start, obd_end;
1678         int i, j;
1679
1680         if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
1681                 last_stripe = start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
1682                                                               start_stripe - 1;
1683                 *stripe_count = lsm->lsm_stripe_count;
1684         } else {
1685                 for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
1686                      i = (i + 1) % lsm->lsm_stripe_count, j++) {
1687                         if ((lov_stripe_intersects(lsm, i, fm_start, fm_end,
1688                                                    &obd_start, &obd_end)) == 0)
1689                                 break;
1690                 }
1691                 *stripe_count = j;
1692                 last_stripe = (start_stripe + j - 1) %lsm->lsm_stripe_count;
1693         }
1694
1695         return last_stripe;
1696 }
1697
1698 /**
1699  * Set fe_device and copy extents from local buffer into main return buffer.
1700  *
1701  * \param fiemap fiemap request header
1702  * \param lcl_fm_ext array of local fiemap extents to be copied
1703  * \param ost_index OST index to be written into the fm_device field for each
1704                     extent
1705  * \param ext_count number of extents to be copied
1706  * \param current_extent where to start copying in main extent array
1707  */
1708 static void fiemap_prepare_and_copy_exts(struct ll_user_fiemap *fiemap,
1709                                          struct ll_fiemap_extent *lcl_fm_ext,
1710                                          int ost_index, unsigned int ext_count,
1711                                          int current_extent)
1712 {
1713         char *to;
1714         int ext;
1715
1716         for (ext = 0; ext < ext_count; ext++) {
1717                 lcl_fm_ext[ext].fe_device = ost_index;
1718                 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1719         }
1720
1721         /* Copy fm_extent's from fm_local to return buffer */
1722         to = (char *)fiemap + fiemap_count_to_size(current_extent);
1723         memcpy(to, lcl_fm_ext, ext_count * sizeof(struct ll_fiemap_extent));
1724 }
1725
1726 /**
1727  * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1728  * This also handles the restarting of FIEMAP calls in case mapping overflows
1729  * the available number of extents in single call.
1730  */
1731 static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
1732                       __u32 *vallen, void *val, struct lov_stripe_md *lsm)
1733 {
1734         struct ll_fiemap_info_key *fm_key = key;
1735         struct ll_user_fiemap *fiemap = val;
1736         struct ll_user_fiemap *fm_local = NULL;
1737         struct ll_fiemap_extent *lcl_fm_ext;
1738         int count_local;
1739         unsigned int get_num_extents = 0;
1740         int ost_index = 0, actual_start_stripe, start_stripe;
1741         u64 fm_start, fm_end, fm_length, fm_end_offset;
1742         u64 curr_loc;
1743         int current_extent = 0, rc = 0, i;
1744         int ost_eof = 0; /* EOF for object */
1745         int ost_done = 0; /* done with required mapping for this OST? */
1746         int last_stripe;
1747         int cur_stripe = 0, cur_stripe_wrap = 0, stripe_count;
1748         unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1749
1750         if (!lsm_has_objects(lsm)) {
1751                 rc = 0;
1752                 goto out;
1753         }
1754
1755         if (fiemap_count_to_size(fm_key->fiemap.fm_extent_count) < buffer_size)
1756                 buffer_size = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
1757
1758         OBD_ALLOC_LARGE(fm_local, buffer_size);
1759         if (fm_local == NULL) {
1760                 rc = -ENOMEM;
1761                 goto out;
1762         }
1763         lcl_fm_ext = &fm_local->fm_extents[0];
1764
1765         count_local = fiemap_size_to_count(buffer_size);
1766
1767         memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
1768         fm_start = fiemap->fm_start;
1769         fm_length = fiemap->fm_length;
1770         /* Calculate start stripe, last stripe and length of mapping */
1771         actual_start_stripe = start_stripe = lov_stripe_number(lsm, fm_start);
1772         fm_end = (fm_length == ~0ULL ? fm_key->oa.o_size :
1773                                                 fm_start + fm_length - 1);
1774         /* If fm_length != ~0ULL but fm_start+fm_length-1 exceeds file size */
1775         if (fm_end > fm_key->oa.o_size)
1776                 fm_end = fm_key->oa.o_size;
1777
1778         last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
1779                                             actual_start_stripe, &stripe_count);
1780
1781         fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start,
1782                                                   fm_end, &start_stripe);
1783         if (fm_end_offset == -EINVAL) {
1784                 rc = -EINVAL;
1785                 goto out;
1786         }
1787
1788         if (fiemap_count_to_size(fiemap->fm_extent_count) > *vallen)
1789                 fiemap->fm_extent_count = fiemap_size_to_count(*vallen);
1790         if (fiemap->fm_extent_count == 0) {
1791                 get_num_extents = 1;
1792                 count_local = 0;
1793         }
1794         /* Check each stripe */
1795         for (cur_stripe = start_stripe, i = 0; i < stripe_count;
1796              i++, cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
1797                 u64 req_fm_len; /* Stores length of required mapping */
1798                 u64 len_mapped_single_call;
1799                 u64 lun_start, lun_end, obd_object_end;
1800                 unsigned int ext_count;
1801
1802                 cur_stripe_wrap = cur_stripe;
1803
1804                 /* Find out range of mapping on this stripe */
1805                 if ((lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
1806                                            &lun_start, &obd_object_end)) == 0)
1807                         continue;
1808
1809                 if (lov_oinfo_is_dummy(lsm->lsm_oinfo[cur_stripe])) {
1810                         rc = -EIO;
1811                         goto out;
1812                 }
1813
1814                 /* If this is a continuation FIEMAP call and we are on
1815                  * starting stripe then lun_start needs to be set to
1816                  * fm_end_offset */
1817                 if (fm_end_offset != 0 && cur_stripe == start_stripe)
1818                         lun_start = fm_end_offset;
1819
1820                 if (fm_length != ~0ULL) {
1821                         /* Handle fm_start + fm_length overflow */
1822                         if (fm_start + fm_length < fm_start)
1823                                 fm_length = ~0ULL - fm_start;
1824                         lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
1825                                                      cur_stripe);
1826                 } else {
1827                         lun_end = ~0ULL;
1828                 }
1829
1830                 if (lun_start == lun_end)
1831                         continue;
1832
1833                 req_fm_len = obd_object_end - lun_start;
1834                 fm_local->fm_length = 0;
1835                 len_mapped_single_call = 0;
1836
1837                 /* If the output buffer is very large and the objects have many
1838                  * extents we may need to loop on a single OST repeatedly */
1839                 ost_eof = 0;
1840                 ost_done = 0;
1841                 do {
1842                         if (get_num_extents == 0) {
1843                                 /* Don't get too many extents. */
1844                                 if (current_extent + count_local >
1845                                     fiemap->fm_extent_count)
1846                                         count_local = fiemap->fm_extent_count -
1847                                                                  current_extent;
1848                         }
1849
1850                         lun_start += len_mapped_single_call;
1851                         fm_local->fm_length = req_fm_len - len_mapped_single_call;
1852                         req_fm_len = fm_local->fm_length;
1853                         fm_local->fm_extent_count = count_local;
1854                         fm_local->fm_mapped_extents = 0;
1855                         fm_local->fm_flags = fiemap->fm_flags;
1856
1857                         fm_key->oa.o_oi = lsm->lsm_oinfo[cur_stripe]->loi_oi;
1858                         ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
1859
1860                         if (ost_index < 0 ||
1861                             ost_index >= lov->desc.ld_tgt_count) {
1862                                 rc = -EINVAL;
1863                                 goto out;
1864                         }
1865
1866                         /* If OST is inactive, return extent with UNKNOWN flag */
1867                         if (!lov->lov_tgts[ost_index]->ltd_active) {
1868                                 fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
1869                                 fm_local->fm_mapped_extents = 1;
1870
1871                                 lcl_fm_ext[0].fe_logical = lun_start;
1872                                 lcl_fm_ext[0].fe_length = obd_object_end -
1873                                                                       lun_start;
1874                                 lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1875
1876                                 goto inactive_tgt;
1877                         }
1878
1879                         fm_local->fm_start = lun_start;
1880                         fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1881                         memcpy(&fm_key->fiemap, fm_local, sizeof(*fm_local));
1882                         *vallen=fiemap_count_to_size(fm_local->fm_extent_count);
1883                         rc = obd_get_info(NULL,
1884                                           lov->lov_tgts[ost_index]->ltd_exp,
1885                                           keylen, key, vallen, fm_local, lsm);
1886                         if (rc != 0)
1887                                 goto out;
1888
1889 inactive_tgt:
1890                         ext_count = fm_local->fm_mapped_extents;
1891                         if (ext_count == 0) {
1892                                 ost_done = 1;
1893                                 /* If last stripe has hole at the end,
1894                                  * then we need to return */
1895                                 if (cur_stripe_wrap == last_stripe) {
1896                                         fiemap->fm_mapped_extents = 0;
1897                                         goto finish;
1898                                 }
1899                                 break;
1900                         }
1901
1902                         /* If we just need num of extents then go to next device */
1903                         if (get_num_extents) {
1904                                 current_extent += ext_count;
1905                                 break;
1906                         }
1907
1908                         len_mapped_single_call = lcl_fm_ext[ext_count-1].fe_logical -
1909                                   lun_start + lcl_fm_ext[ext_count - 1].fe_length;
1910
1911                         /* Have we finished mapping on this device? */
1912                         if (req_fm_len <= len_mapped_single_call)
1913                                 ost_done = 1;
1914
1915                         /* Clear the EXTENT_LAST flag which can be present on
1916                          * last extent */
1917                         if (lcl_fm_ext[ext_count-1].fe_flags & FIEMAP_EXTENT_LAST)
1918                                 lcl_fm_ext[ext_count - 1].fe_flags &=
1919                                                             ~FIEMAP_EXTENT_LAST;
1920
1921                         curr_loc = lov_stripe_size(lsm,
1922                                            lcl_fm_ext[ext_count - 1].fe_logical+
1923                                            lcl_fm_ext[ext_count - 1].fe_length,
1924                                            cur_stripe);
1925                         if (curr_loc >= fm_key->oa.o_size)
1926                                 ost_eof = 1;
1927
1928                         fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
1929                                                      ost_index, ext_count,
1930                                                      current_extent);
1931
1932                         current_extent += ext_count;
1933
1934                         /* Ran out of available extents? */
1935                         if (current_extent >= fiemap->fm_extent_count)
1936                                 goto finish;
1937                 } while (ost_done == 0 && ost_eof == 0);
1938
1939                 if (cur_stripe_wrap == last_stripe)
1940                         goto finish;
1941         }
1942
1943 finish:
1944         /* Indicate that we are returning device offsets unless file just has
1945          * single stripe */
1946         if (lsm->lsm_stripe_count > 1)
1947                 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
1948
1949         if (get_num_extents)
1950                 goto skip_last_device_calc;
1951
1952         /* Check if we have reached the last stripe and whether mapping for that
1953          * stripe is done. */
1954         if (cur_stripe_wrap == last_stripe) {
1955                 if (ost_done || ost_eof)
1956                         fiemap->fm_extents[current_extent - 1].fe_flags |=
1957                                                              FIEMAP_EXTENT_LAST;
1958         }
1959
1960 skip_last_device_calc:
1961         fiemap->fm_mapped_extents = current_extent;
1962
1963 out:
1964         OBD_FREE_LARGE(fm_local, buffer_size);
1965         return rc;
1966 }
1967
1968 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1969                         __u32 keylen, void *key, __u32 *vallen, void *val,
1970                         struct lov_stripe_md *lsm)
1971 {
1972         struct obd_device *obddev = class_exp2obd(exp);
1973         struct lov_obd *lov = &obddev->u.lov;
1974         int i, rc;
1975
1976         if (!vallen || !val)
1977                 return -EFAULT;
1978
1979         obd_getref(obddev);
1980
1981         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
1982                 struct {
1983                         char name[16];
1984                         struct ldlm_lock *lock;
1985                 } *data = key;
1986                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
1987                 struct lov_oinfo *loi;
1988                 __u32 *stripe = val;
1989
1990                 if (*vallen < sizeof(*stripe)) {
1991                         rc = -EFAULT;
1992                         goto out;
1993                 }
1994                 *vallen = sizeof(*stripe);
1995
1996                 /* XXX This is another one of those bits that will need to
1997                  * change if we ever actually support nested LOVs.  It uses
1998                  * the lock's export to find out which stripe it is. */
1999                 /* XXX - it's assumed all the locks for deleted OSTs have
2000                  * been cancelled. Also, the export for deleted OSTs will
2001                  * be NULL and won't match the lock's export. */
2002                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
2003                         loi = lsm->lsm_oinfo[i];
2004                         if (lov_oinfo_is_dummy(loi))
2005                                 continue;
2006
2007                         if (!lov->lov_tgts[loi->loi_ost_idx])
2008                                 continue;
2009                         if (lov->lov_tgts[loi->loi_ost_idx]->ltd_exp ==
2010                             data->lock->l_conn_export &&
2011                             ostid_res_name_eq(&loi->loi_oi, res_id)) {
2012                                 *stripe = i;
2013                                 rc = 0;
2014                                 goto out;
2015                         }
2016                 }
2017                 LDLM_ERROR(data->lock, "lock on inode without such object");
2018                 dump_lsm(D_ERROR, lsm);
2019                 rc = -ENXIO;
2020                 goto out;
2021         } else if (KEY_IS(KEY_LAST_ID)) {
2022                 struct obd_id_info *info = val;
2023                 __u32 size = sizeof(u64);
2024                 struct lov_tgt_desc *tgt;
2025
2026                 LASSERT(*vallen == sizeof(struct obd_id_info));
2027                 tgt = lov->lov_tgts[info->idx];
2028
2029                 if (!tgt || !tgt->ltd_active) {
2030                         rc = -ESRCH;
2031                         goto out;
2032                 }
2033
2034                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
2035                                   &size, info->data, NULL);
2036                 rc = 0;
2037                 goto out;
2038         } else if (KEY_IS(KEY_LOVDESC)) {
2039                 struct lov_desc *desc_ret = val;
2040                 *desc_ret = lov->desc;
2041
2042                 rc = 0;
2043                 goto out;
2044         } else if (KEY_IS(KEY_FIEMAP)) {
2045                 rc = lov_fiemap(lov, keylen, key, vallen, val, lsm);
2046                 goto out;
2047         } else if (KEY_IS(KEY_CONNECT_FLAG)) {
2048                 struct lov_tgt_desc *tgt;
2049                 __u64 ost_idx = *((__u64 *)val);
2050
2051                 LASSERT(*vallen == sizeof(__u64));
2052                 LASSERT(ost_idx < lov->desc.ld_tgt_count);
2053                 tgt = lov->lov_tgts[ost_idx];
2054
2055                 if (!tgt || !tgt->ltd_exp) {
2056                         rc = -ESRCH;
2057                         goto out;
2058                 }
2059
2060                 *((__u64 *)val) = exp_connect_flags(tgt->ltd_exp);
2061                 rc = 0;
2062                 goto out;
2063         } else if (KEY_IS(KEY_TGT_COUNT)) {
2064                 *((int *)val) = lov->desc.ld_tgt_count;
2065                 rc = 0;
2066                 goto out;
2067         }
2068
2069         rc = -EINVAL;
2070
2071 out:
2072         obd_putref(obddev);
2073         return rc;
2074 }
2075
2076 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
2077                               u32 keylen, void *key, u32 vallen,
2078                               void *val, struct ptlrpc_request_set *set)
2079 {
2080         struct obd_device *obddev = class_exp2obd(exp);
2081         struct lov_obd *lov = &obddev->u.lov;
2082         u32 count;
2083         int i, rc = 0, err;
2084         struct lov_tgt_desc *tgt;
2085         unsigned incr, check_uuid,
2086                  do_inactive, no_set;
2087         unsigned next_id = 0,  mds_con = 0, capa = 0;
2088
2089         incr = check_uuid = do_inactive = no_set = 0;
2090         if (set == NULL) {
2091                 no_set = 1;
2092                 set = ptlrpc_prep_set();
2093                 if (!set)
2094                         return -ENOMEM;
2095         }
2096
2097         obd_getref(obddev);
2098         count = lov->desc.ld_tgt_count;
2099
2100         if (KEY_IS(KEY_NEXT_ID)) {
2101                 count = vallen / sizeof(struct obd_id_info);
2102                 vallen = sizeof(u64);
2103                 incr = sizeof(struct obd_id_info);
2104                 do_inactive = 1;
2105                 next_id = 1;
2106         } else if (KEY_IS(KEY_CHECKSUM)) {
2107                 do_inactive = 1;
2108         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2109                 /* use defaults:  do_inactive = incr = 0; */
2110         } else if (KEY_IS(KEY_MDS_CONN)) {
2111                 mds_con = 1;
2112         } else if (KEY_IS(KEY_CAPA_KEY)) {
2113                 capa = 1;
2114         } else if (KEY_IS(KEY_CACHE_SET)) {
2115                 LASSERT(lov->lov_cache == NULL);
2116                 lov->lov_cache = val;
2117                 do_inactive = 1;
2118         }
2119
2120         for (i = 0; i < count; i++, val = (char *)val + incr) {
2121                 if (next_id) {
2122                         tgt = lov->lov_tgts[((struct obd_id_info *)val)->idx];
2123                 } else {
2124                         tgt = lov->lov_tgts[i];
2125                 }
2126                 /* OST was disconnected */
2127                 if (!tgt || !tgt->ltd_exp)
2128                         continue;
2129
2130                 /* OST is inactive and we don't want inactive OSCs */
2131                 if (!tgt->ltd_active && !do_inactive)
2132                         continue;
2133
2134                 if (mds_con) {
2135                         struct mds_group_info *mgi;
2136
2137                         LASSERT(vallen == sizeof(*mgi));
2138                         mgi = (struct mds_group_info *)val;
2139
2140                         /* Only want a specific OSC */
2141                         if (mgi->uuid && !obd_uuid_equals(mgi->uuid,
2142                                                 &tgt->ltd_uuid))
2143                                 continue;
2144
2145                         err = obd_set_info_async(env, tgt->ltd_exp,
2146                                          keylen, key, sizeof(int),
2147                                          &mgi->group, set);
2148                 } else if (next_id) {
2149                         err = obd_set_info_async(env, tgt->ltd_exp,
2150                                          keylen, key, vallen,
2151                                          ((struct obd_id_info *)val)->data, set);
2152                 } else if (capa) {
2153                         struct mds_capa_info *info = (struct mds_capa_info *)val;
2154
2155                         LASSERT(vallen == sizeof(*info));
2156
2157                          /* Only want a specific OSC */
2158                         if (info->uuid &&
2159                             !obd_uuid_equals(info->uuid, &tgt->ltd_uuid))
2160                                 continue;
2161
2162                         err = obd_set_info_async(env, tgt->ltd_exp, keylen,
2163                                                  key, sizeof(*info->capa),
2164                                                  info->capa, set);
2165                 } else {
2166                         /* Only want a specific OSC */
2167                         if (check_uuid &&
2168                             !obd_uuid_equals(val, &tgt->ltd_uuid))
2169                                 continue;
2170
2171                         err = obd_set_info_async(env, tgt->ltd_exp,
2172                                          keylen, key, vallen, val, set);
2173                 }
2174
2175                 if (!rc)
2176                         rc = err;
2177         }
2178
2179         obd_putref(obddev);
2180         if (no_set) {
2181                 err = ptlrpc_set_wait(set);
2182                 if (!rc)
2183                         rc = err;
2184                 ptlrpc_set_destroy(set);
2185         }
2186         return rc;
2187 }
2188
2189 void lov_stripe_lock(struct lov_stripe_md *md)
2190                 __acquires(&md->lsm_lock)
2191 {
2192         LASSERT(md->lsm_lock_owner != current_pid());
2193         spin_lock(&md->lsm_lock);
2194         LASSERT(md->lsm_lock_owner == 0);
2195         md->lsm_lock_owner = current_pid();
2196 }
2197 EXPORT_SYMBOL(lov_stripe_lock);
2198
2199 void lov_stripe_unlock(struct lov_stripe_md *md)
2200                 __releases(&md->lsm_lock)
2201 {
2202         LASSERT(md->lsm_lock_owner == current_pid());
2203         md->lsm_lock_owner = 0;
2204         spin_unlock(&md->lsm_lock);
2205 }
2206 EXPORT_SYMBOL(lov_stripe_unlock);
2207
2208 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
2209                         struct obd_quotactl *oqctl)
2210 {
2211         struct lov_obd      *lov = &obd->u.lov;
2212         struct lov_tgt_desc *tgt;
2213         __u64           curspace = 0;
2214         __u64           bhardlimit = 0;
2215         int               i, rc = 0;
2216
2217         if (oqctl->qc_cmd != LUSTRE_Q_QUOTAON &&
2218             oqctl->qc_cmd != LUSTRE_Q_QUOTAOFF &&
2219             oqctl->qc_cmd != Q_GETOQUOTA &&
2220             oqctl->qc_cmd != Q_INITQUOTA &&
2221             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA &&
2222             oqctl->qc_cmd != Q_FINVALIDATE) {
2223                 CERROR("bad quota opc %x for lov obd", oqctl->qc_cmd);
2224                 return -EFAULT;
2225         }
2226
2227         /* for lov tgt */
2228         obd_getref(obd);
2229         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2230                 int err;
2231
2232                 tgt = lov->lov_tgts[i];
2233
2234                 if (!tgt)
2235                         continue;
2236
2237                 if (!tgt->ltd_active || tgt->ltd_reap) {
2238                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
2239                             lov->lov_tgts[i]->ltd_activate) {
2240                                 rc = -EREMOTEIO;
2241                                 CERROR("ost %d is inactive\n", i);
2242                         } else {
2243                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
2244                         }
2245                         continue;
2246                 }
2247
2248                 err = obd_quotactl(tgt->ltd_exp, oqctl);
2249                 if (err) {
2250                         if (tgt->ltd_active && !rc)
2251                                 rc = err;
2252                         continue;
2253                 }
2254
2255                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
2256                         curspace += oqctl->qc_dqblk.dqb_curspace;
2257                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
2258                 }
2259         }
2260         obd_putref(obd);
2261
2262         if (oqctl->qc_cmd == Q_GETOQUOTA) {
2263                 oqctl->qc_dqblk.dqb_curspace = curspace;
2264                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
2265         }
2266         return rc;
2267 }
2268
2269 static int lov_quotacheck(struct obd_device *obd, struct obd_export *exp,
2270                           struct obd_quotactl *oqctl)
2271 {
2272         struct lov_obd *lov = &obd->u.lov;
2273         int          i, rc = 0;
2274
2275         obd_getref(obd);
2276
2277         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2278                 if (!lov->lov_tgts[i])
2279                         continue;
2280
2281                 /* Skip quota check on the administratively disabled OSTs. */
2282                 if (!lov->lov_tgts[i]->ltd_activate) {
2283                         CWARN("lov idx %d was administratively disabled, skip quotacheck on it.\n",
2284                               i);
2285                         continue;
2286                 }
2287
2288                 if (!lov->lov_tgts[i]->ltd_active) {
2289                         CERROR("lov idx %d inactive\n", i);
2290                         rc = -EIO;
2291                         goto out;
2292                 }
2293         }
2294
2295         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2296                 int err;
2297
2298                 if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_activate)
2299                         continue;
2300
2301                 err = obd_quotacheck(lov->lov_tgts[i]->ltd_exp, oqctl);
2302                 if (err && !rc)
2303                         rc = err;
2304         }
2305
2306 out:
2307         obd_putref(obd);
2308
2309         return rc;
2310 }
2311
2312 static struct obd_ops lov_obd_ops = {
2313         .o_owner               = THIS_MODULE,
2314         .o_setup               = lov_setup,
2315         .o_precleanup     = lov_precleanup,
2316         .o_cleanup           = lov_cleanup,
2317         /*.o_process_config      = lov_process_config,*/
2318         .o_connect           = lov_connect,
2319         .o_disconnect     = lov_disconnect,
2320         .o_statfs             = lov_statfs,
2321         .o_statfs_async = lov_statfs_async,
2322         .o_packmd             = lov_packmd,
2323         .o_unpackmd         = lov_unpackmd,
2324         .o_create             = lov_create,
2325         .o_destroy           = lov_destroy,
2326         .o_getattr_async       = lov_getattr_async,
2327         .o_setattr_async       = lov_setattr_async,
2328         .o_adjust_kms     = lov_adjust_kms,
2329         .o_find_cbdata   = lov_find_cbdata,
2330         .o_iocontrol       = lov_iocontrol,
2331         .o_get_info         = lov_get_info,
2332         .o_set_info_async      = lov_set_info_async,
2333         .o_notify             = lov_notify,
2334         .o_pool_new         = lov_pool_new,
2335         .o_pool_rem         = lov_pool_remove,
2336         .o_pool_add         = lov_pool_add,
2337         .o_pool_del         = lov_pool_del,
2338         .o_getref             = lov_getref,
2339         .o_putref             = lov_putref,
2340         .o_quotactl         = lov_quotactl,
2341         .o_quotacheck     = lov_quotacheck,
2342 };
2343
2344 struct kmem_cache *lov_oinfo_slab;
2345
2346 static int __init lov_init(void)
2347 {
2348         struct lprocfs_static_vars lvars = { NULL };
2349         int rc;
2350
2351         /* print an address of _any_ initialized kernel symbol from this
2352          * module, to allow debugging with gdb that doesn't support data
2353          * symbols from modules.*/
2354         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
2355
2356         rc = lu_kmem_init(lov_caches);
2357         if (rc)
2358                 return rc;
2359
2360         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
2361                                               sizeof(struct lov_oinfo),
2362                                               0, SLAB_HWCACHE_ALIGN, NULL);
2363         if (lov_oinfo_slab == NULL) {
2364                 lu_kmem_fini(lov_caches);
2365                 return -ENOMEM;
2366         }
2367         lprocfs_lov_init_vars(&lvars);
2368
2369         rc = class_register_type(&lov_obd_ops, NULL, lvars.module_vars,
2370                                  LUSTRE_LOV_NAME, &lov_device_type);
2371
2372         if (rc) {
2373                 kmem_cache_destroy(lov_oinfo_slab);
2374                 lu_kmem_fini(lov_caches);
2375         }
2376
2377         return rc;
2378 }
2379
2380 static void /*__exit*/ lov_exit(void)
2381 {
2382         class_unregister_type(LUSTRE_LOV_NAME);
2383         kmem_cache_destroy(lov_oinfo_slab);
2384
2385         lu_kmem_fini(lov_caches);
2386 }
2387
2388 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2389 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
2390 MODULE_LICENSE("GPL");
2391 MODULE_VERSION(LUSTRE_VERSION_STRING);
2392
2393 module_init(lov_init);
2394 module_exit(lov_exit);