drivers/staging/lustre/lustre/lov/lov_request.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LOV
  34
  35 #include "../../include/linux/libcfs/libcfs.h"
  36
  37 #include "../include/obd_class.h"
  38 #include "../include/lustre/lustre_idl.h"
  39 #include "lov_internal.h"
  40
  41 static void lov_init_set(struct lov_request_set *set)
  42 {
  43         set->set_count = 0;
  44         atomic_set(&set->set_completes, 0);
  45         atomic_set(&set->set_success, 0);
  46         atomic_set(&set->set_finish_checked, 0);
  47         set->set_cookies = NULL;
  48         INIT_LIST_HEAD(&set->set_list);
  49         atomic_set(&set->set_refcount, 1);
  50         init_waitqueue_head(&set->set_waitq);
  51 }
  52
  53 void lov_finish_set(struct lov_request_set *set)
  54 {
  55         struct list_head *pos, *n;
  56
  57         LASSERT(set);
  58         list_for_each_safe(pos, n, &set->set_list) {
  59                 struct lov_request *req = list_entry(pos,
  60                                                          struct lov_request,
  61                                                          rq_link);
  62                 list_del_init(&req->rq_link);
  63
  64                 if (req->rq_oi.oi_oa)
  65                         kmem_cache_free(obdo_cachep, req->rq_oi.oi_oa);
  66                 kfree(req->rq_oi.oi_osfs);
  67                 kfree(req);
  68         }
  69         kfree(set);
  70 }
  71
  72 static int lov_set_finished(struct lov_request_set *set, int idempotent)
  73 {
  74         int completes = atomic_read(&set->set_completes);
  75
  76         CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
  77
  78         if (completes == set->set_count) {
  79                 if (idempotent)
  80                         return 1;
  81                 if (atomic_inc_return(&set->set_finish_checked) == 1)
  82                         return 1;
  83         }
  84         return 0;
  85 }
  86
  87 static void lov_update_set(struct lov_request_set *set,
  88                            struct lov_request *req, int rc)
  89 {
  90         req->rq_complete = 1;
  91         req->rq_rc = rc;
  92
  93         atomic_inc(&set->set_completes);
  94         if (rc == 0)
  95                 atomic_inc(&set->set_success);
  96
  97         wake_up(&set->set_waitq);
  98 }
  99
 100 int lov_update_common_set(struct lov_request_set *set,
 101                           struct lov_request *req, int rc)
 102 {
 103         struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
 104
 105         lov_update_set(set, req, rc);
 106
 107         /* grace error on inactive ost */
 108         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 109                     lov->lov_tgts[req->rq_idx]->ltd_active))
 110                 rc = 0;
 111
 112         /* FIXME in raid1 regime, should return 0 */
 113         return rc;
 114 }
 115
 116 static void lov_set_add_req(struct lov_request *req,
 117                             struct lov_request_set *set)
 118 {
 119         list_add_tail(&req->rq_link, &set->set_list);
 120         set->set_count++;
 121         req->rq_rqset = set;
 122 }
 123
 124 static int lov_check_set(struct lov_obd *lov, int idx)
 125 {
 126         int rc;
 127         struct lov_tgt_desc *tgt;
 128
 129         mutex_lock(&lov->lov_lock);
 130         tgt = lov->lov_tgts[idx];
 131         rc = !tgt || tgt->ltd_active ||
 132                 (tgt->ltd_exp &&
 133                  class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried);
 134         mutex_unlock(&lov->lov_lock);
 135
 136         return rc;
 137 }
 138
 139 /* Check if the OSC connection exists and is active.
 140  * If the OSC has not yet had a chance to connect to the OST the first time,
 141  * wait once for it to connect instead of returning an error.
 142  */
 143 static int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 144 {
 145         wait_queue_head_t waitq;
 146         struct l_wait_info lwi;
 147         struct lov_tgt_desc *tgt;
 148         int rc = 0;
 149
 150         mutex_lock(&lov->lov_lock);
 151
 152         tgt = lov->lov_tgts[ost_idx];
 153
 154         if (unlikely(!tgt)) {
 155                 rc = 0;
 156                 goto out;
 157         }
 158
 159         if (likely(tgt->ltd_active)) {
 160                 rc = 1;
 161                 goto out;
 162         }
 163
 164         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried) {
 165                 rc = 0;
 166                 goto out;
 167         }
 168
 169         mutex_unlock(&lov->lov_lock);
 170
 171         init_waitqueue_head(&waitq);
 172         lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
 173                                    cfs_time_seconds(1), NULL, NULL);
 174
 175         rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
 176         if (tgt->ltd_active)
 177                 return 1;
 178
 179         return 0;
 180
 181 out:
 182         mutex_unlock(&lov->lov_lock);
 183         return rc;
 184 }
 185
 186 static int common_attr_done(struct lov_request_set *set)
 187 {
 188         struct lov_request *req;
 189         struct obdo *tmp_oa;
 190         int rc = 0, attrset = 0;
 191
 192         if (!set->set_oi->oi_oa)
 193                 return 0;
 194
 195         if (!atomic_read(&set->set_success))
 196                 return -EIO;
 197
 198         tmp_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 199         if (!tmp_oa) {
 200                 rc = -ENOMEM;
 201                 goto out;
 202         }
 203
 204         list_for_each_entry(req, &set->set_list, rq_link) {
 205                 if (!req->rq_complete || req->rq_rc)
 206                         continue;
 207                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 208                         continue;
 209                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 210                                 req->rq_oi.oi_oa->o_valid,
 211                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 212         }
 213         if (!attrset) {
 214                 CERROR("No stripes had valid attrs\n");
 215                 rc = -EIO;
 216         }
 217         if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
 218             (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
 219                 /* When we take attributes of some epoch, we require all the
 220                  * ost to be active.
 221                  */
 222                 CERROR("Not all the stripes had valid attrs\n");
 223                 rc = -EIO;
 224                 goto out;
 225         }
 226
 227         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 228         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 229 out:
 230         if (tmp_oa)
 231                 kmem_cache_free(obdo_cachep, tmp_oa);
 232         return rc;
 233 }
 234
 235 int lov_fini_getattr_set(struct lov_request_set *set)
 236 {
 237         int rc = 0;
 238
 239         if (!set)
 240                 return 0;
 241         LASSERT(set->set_exp);
 242         if (atomic_read(&set->set_completes))
 243                 rc = common_attr_done(set);
 244
 245         lov_put_reqset(set);
 246
 247         return rc;
 248 }
 249
 250 /* The callback for osc_getattr_async that finalizes a request info when a
 251  * response is received.
 252  */
 253 static int cb_getattr_update(void *cookie, int rc)
 254 {
 255         struct obd_info *oinfo = cookie;
 256         struct lov_request *lovreq;
 257
 258         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 259         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 260 }
 261
 262 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 263                          struct lov_request_set **reqset)
 264 {
 265         struct lov_request_set *set;
 266         struct lov_obd *lov = &exp->exp_obd->u.lov;
 267         int rc = 0, i;
 268
 269         set = kzalloc(sizeof(*set), GFP_NOFS);
 270         if (!set)
 271                 return -ENOMEM;
 272         lov_init_set(set);
 273
 274         set->set_exp = exp;
 275         set->set_oi = oinfo;
 276
 277         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 278                 struct lov_oinfo *loi;
 279                 struct lov_request *req;
 280
 281                 loi = oinfo->oi_md->lsm_oinfo[i];
 282                 if (lov_oinfo_is_dummy(loi))
 283                         continue;
 284
 285                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 286                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 287                         if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH) {
 288                                 /* SOM requires all the OSTs to be active. */
 289                                 rc = -EIO;
 290                                 goto out_set;
 291                         }
 292                         continue;
 293                 }
 294
 295                 req = kzalloc(sizeof(*req), GFP_NOFS);
 296                 if (!req) {
 297                         rc = -ENOMEM;
 298                         goto out_set;
 299                 }
 300
 301                 req->rq_stripe = i;
 302                 req->rq_idx = loi->loi_ost_idx;
 303
 304                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 305                 if (!req->rq_oi.oi_oa) {
 306                         kfree(req);
 307                         rc = -ENOMEM;
 308                         goto out_set;
 309                 }
 310                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 311                        sizeof(*req->rq_oi.oi_oa));
 312                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 313                 req->rq_oi.oi_cb_up = cb_getattr_update;
 314
 315                 lov_set_add_req(req, set);
 316         }
 317         if (!set->set_count) {
 318                 rc = -EIO;
 319                 goto out_set;
 320         }
 321         *reqset = set;
 322         return rc;
 323 out_set:
 324         lov_fini_getattr_set(set);
 325         return rc;
 326 }
 327
 328 int lov_fini_setattr_set(struct lov_request_set *set)
 329 {
 330         int rc = 0;
 331
 332         if (!set)
 333                 return 0;
 334         LASSERT(set->set_exp);
 335         if (atomic_read(&set->set_completes)) {
 336                 rc = common_attr_done(set);
 337                 /* FIXME update qos data here */
 338         }
 339
 340         lov_put_reqset(set);
 341         return rc;
 342 }
 343
 344 int lov_update_setattr_set(struct lov_request_set *set,
 345                            struct lov_request *req, int rc)
 346 {
 347         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 348         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 349
 350         lov_update_set(set, req, rc);
 351
 352         /* grace error on inactive ost */
 353         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 354                     lov->lov_tgts[req->rq_idx]->ltd_active))
 355                 rc = 0;
 356
 357         if (rc == 0) {
 358                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 359                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 360                                 req->rq_oi.oi_oa->o_ctime;
 361                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 362                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 363                                 req->rq_oi.oi_oa->o_mtime;
 364                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 365                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 366                                 req->rq_oi.oi_oa->o_atime;
 367         }
 368
 369         return rc;
 370 }
 371
 372 /* The callback for osc_setattr_async that finalizes a request info when a
 373  * response is received.
 374  */
 375 static int cb_setattr_update(void *cookie, int rc)
 376 {
 377         struct obd_info *oinfo = cookie;
 378         struct lov_request *lovreq;
 379
 380         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 381         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 382 }
 383
 384 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 385                          struct obd_trans_info *oti,
 386                          struct lov_request_set **reqset)
 387 {
 388         struct lov_request_set *set;
 389         struct lov_obd *lov = &exp->exp_obd->u.lov;
 390         int rc = 0, i;
 391
 392         set = kzalloc(sizeof(*set), GFP_NOFS);
 393         if (!set)
 394                 return -ENOMEM;
 395         lov_init_set(set);
 396
 397         set->set_exp = exp;
 398         set->set_oi = oinfo;
 399         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 400                 set->set_cookies = oti->oti_logcookies;
 401
 402         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 403                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 404                 struct lov_request *req;
 405
 406                 if (lov_oinfo_is_dummy(loi))
 407                         continue;
 408
 409                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 410                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 411                         continue;
 412                 }
 413
 414                 req = kzalloc(sizeof(*req), GFP_NOFS);
 415                 if (!req) {
 416                         rc = -ENOMEM;
 417                         goto out_set;
 418                 }
 419                 req->rq_stripe = i;
 420                 req->rq_idx = loi->loi_ost_idx;
 421
 422                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 423                 if (!req->rq_oi.oi_oa) {
 424                         kfree(req);
 425                         rc = -ENOMEM;
 426                         goto out_set;
 427                 }
 428                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 429                        sizeof(*req->rq_oi.oi_oa));
 430                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 431                 req->rq_oi.oi_oa->o_stripe_idx = i;
 432                 req->rq_oi.oi_cb_up = cb_setattr_update;
 433
 434                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 435                         int off = lov_stripe_offset(oinfo->oi_md,
 436                                                     oinfo->oi_oa->o_size, i,
 437                                                     &req->rq_oi.oi_oa->o_size);
 438
 439                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 440                                 req->rq_oi.oi_oa->o_size--;
 441
 442                         CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
 443                                i, req->rq_oi.oi_oa->o_size,
 444                                oinfo->oi_oa->o_size);
 445                 }
 446                 lov_set_add_req(req, set);
 447         }
 448         if (!set->set_count) {
 449                 rc = -EIO;
 450                 goto out_set;
 451         }
 452         *reqset = set;
 453         return rc;
 454 out_set:
 455         lov_fini_setattr_set(set);
 456         return rc;
 457 }
 458
 459 #define LOV_U64_MAX ((__u64)~0ULL)
 460 #define LOV_SUM_MAX(tot, add)                                      \
 461         do {                                                        \
 462                 if ((tot) + (add) < (tot))                            \
 463                         (tot) = LOV_U64_MAX;                        \
 464                 else                                                \
 465                         (tot) += (add);                          \
 466         } while (0)
 467
 468 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 469                     int success)
 470 {
 471         if (success) {
 472                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 473                                                            LOV_MAGIC, 0);
 474                 if (osfs->os_files != LOV_U64_MAX)
 475                         lov_do_div64(osfs->os_files, expected_stripes);
 476                 if (osfs->os_ffree != LOV_U64_MAX)
 477                         lov_do_div64(osfs->os_ffree, expected_stripes);
 478
 479                 spin_lock(&obd->obd_osfs_lock);
 480                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 481                 obd->obd_osfs_age = cfs_time_current_64();
 482                 spin_unlock(&obd->obd_osfs_lock);
 483                 return 0;
 484         }
 485
 486         return -EIO;
 487 }
 488
 489 int lov_fini_statfs_set(struct lov_request_set *set)
 490 {
 491         int rc = 0;
 492
 493         if (!set)
 494                 return 0;
 495
 496         if (atomic_read(&set->set_completes)) {
 497                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 498                                      atomic_read(&set->set_success));
 499         }
 500         lov_put_reqset(set);
 501         return rc;
 502 }
 503
 504 static void lov_update_statfs(struct obd_statfs *osfs,
 505                               struct obd_statfs *lov_sfs,
 506                               int success)
 507 {
 508         int shift = 0, quit = 0;
 509         __u64 tmp;
 510
 511         if (success == 0) {
 512                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 513         } else {
 514                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 515                         /* assume all block sizes are always powers of 2 */
 516                         /* get the bits difference */
 517                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 518                         for (shift = 0; shift <= 64; ++shift) {
 519                                 if (tmp & 1) {
 520                                         if (quit)
 521                                                 break;
 522                                         quit = 1;
 523                                         shift = 0;
 524                                 }
 525                                 tmp >>= 1;
 526                         }
 527                 }
 528
 529                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 530                         osfs->os_bsize = lov_sfs->os_bsize;
 531
 532                         osfs->os_bfree  >>= shift;
 533                         osfs->os_bavail >>= shift;
 534                         osfs->os_blocks >>= shift;
 535                 } else if (shift != 0) {
 536                         lov_sfs->os_bfree  >>= shift;
 537                         lov_sfs->os_bavail >>= shift;
 538                         lov_sfs->os_blocks >>= shift;
 539                 }
 540                 osfs->os_bfree += lov_sfs->os_bfree;
 541                 osfs->os_bavail += lov_sfs->os_bavail;
 542                 osfs->os_blocks += lov_sfs->os_blocks;
 543                 /* XXX not sure about this one - depends on policy.
 544                  *   - could be minimum if we always stripe on all OBDs
 545                  *     (but that would be wrong for any other policy,
 546                  *     if one of the OBDs has no more objects left)
 547                  *   - could be sum if we stripe whole objects
 548                  *   - could be average, just to give a nice number
 549                  *
 550                  * To give a "reasonable" (if not wholly accurate)
 551                  * number, we divide the total number of free objects
 552                  * by expected stripe count (watch out for overflow).
 553                  */
 554                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 555                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 556         }
 557 }
 558
 559 /* The callback for osc_statfs_async that finalizes a request info when a
 560  * response is received.
 561  */
 562 static int cb_statfs_update(void *cookie, int rc)
 563 {
 564         struct obd_info *oinfo = cookie;
 565         struct lov_request *lovreq;
 566         struct lov_request_set *set;
 567         struct obd_statfs *osfs, *lov_sfs;
 568         struct lov_obd *lov;
 569         struct lov_tgt_desc *tgt;
 570         struct obd_device *lovobd, *tgtobd;
 571         int success;
 572
 573         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 574         set = lovreq->rq_rqset;
 575         lovobd = set->set_obd;
 576         lov = &lovobd->u.lov;
 577         osfs = set->set_oi->oi_osfs;
 578         lov_sfs = oinfo->oi_osfs;
 579         success = atomic_read(&set->set_success);
 580         /* XXX: the same is done in lov_update_common_set, however
 581          * lovset->set_exp is not initialized.
 582          */
 583         lov_update_set(set, lovreq, rc);
 584         if (rc)
 585                 goto out;
 586
 587         obd_getref(lovobd);
 588         tgt = lov->lov_tgts[lovreq->rq_idx];
 589         if (!tgt || !tgt->ltd_active)
 590                 goto out_update;
 591
 592         tgtobd = class_exp2obd(tgt->ltd_exp);
 593         spin_lock(&tgtobd->obd_osfs_lock);
 594         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 595         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 596                 tgtobd->obd_osfs_age = cfs_time_current_64();
 597         spin_unlock(&tgtobd->obd_osfs_lock);
 598
 599 out_update:
 600         lov_update_statfs(osfs, lov_sfs, success);
 601         obd_putref(lovobd);
 602
 603 out:
 604         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 605             lov_set_finished(set, 0)) {
 606                 lov_statfs_interpret(NULL, set, set->set_count !=
 607                                      atomic_read(&set->set_success));
 608         }
 609
 610         return 0;
 611 }
 612
 613 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 614                         struct lov_request_set **reqset)
 615 {
 616         struct lov_request_set *set;
 617         struct lov_obd *lov = &obd->u.lov;
 618         int rc = 0, i;
 619
 620         set = kzalloc(sizeof(*set), GFP_NOFS);
 621         if (!set)
 622                 return -ENOMEM;
 623         lov_init_set(set);
 624
 625         set->set_obd = obd;
 626         set->set_oi = oinfo;
 627
 628         /* We only get block data from the OBD */
 629         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 630                 struct lov_request *req;
 631
 632                 if (!lov->lov_tgts[i] ||
 633                     (oinfo->oi_flags & OBD_STATFS_NODELAY &&
 634                      !lov->lov_tgts[i]->ltd_active)) {
 635                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 636                         continue;
 637                 }
 638
 639                 if (!lov->lov_tgts[i]->ltd_active)
 640                         lov_check_and_wait_active(lov, i);
 641
 642                 /* skip targets that have been explicitly disabled by the
 643                  * administrator
 644                  */
 645                 if (!lov->lov_tgts[i]->ltd_exp) {
 646                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 647                         continue;
 648                 }
 649
 650                 req = kzalloc(sizeof(*req), GFP_NOFS);
 651                 if (!req) {
 652                         rc = -ENOMEM;
 653                         goto out_set;
 654                 }
 655
 656                 req->rq_oi.oi_osfs = kzalloc(sizeof(*req->rq_oi.oi_osfs),
 657                                              GFP_NOFS);
 658                 if (!req->rq_oi.oi_osfs) {
 659                         kfree(req);
 660                         rc = -ENOMEM;
 661                         goto out_set;
 662                 }
 663
 664                 req->rq_idx = i;
 665                 req->rq_oi.oi_cb_up = cb_statfs_update;
 666                 req->rq_oi.oi_flags = oinfo->oi_flags;
 667
 668                 lov_set_add_req(req, set);
 669         }
 670         if (!set->set_count) {
 671                 rc = -EIO;
 672                 goto out_set;
 673         }
 674         *reqset = set;
 675         return rc;
 676 out_set:
 677         lov_fini_statfs_set(set);
 678         return rc;
 679 }