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