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.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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, 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
  37 #define DEBUG_SUBSYSTEM S_LOV
  38
  39 #include <libcfs/libcfs.h>
  40
  41 #include <obd_class.h>
  42 #include <lustre/lustre_idl.h>
  43
  44 #include "lov_internal.h"
  45
  46 static void lov_init_set(struct lov_request_set *set)
  47 {
  48         set->set_count = 0;
  49         atomic_set(&set->set_completes, 0);
  50         atomic_set(&set->set_success, 0);
  51         atomic_set(&set->set_finish_checked, 0);
  52         set->set_cookies = NULL;
  53         INIT_LIST_HEAD(&set->set_list);
  54         atomic_set(&set->set_refcount, 1);
  55         init_waitqueue_head(&set->set_waitq);
  56 }
  57
  58 void lov_finish_set(struct lov_request_set *set)
  59 {
  60         struct list_head *pos, *n;
  61         struct lov_request *req;
  62         ENTRY;
  63
  64         LASSERT(set != NULL);
  65         list_for_each_safe(pos, n, &set->set_list) {
  66                 req = list_entry(pos, struct lov_request, rq_link);
  67                 list_del_init(&req->rq_link);
  68
  69                 if (req->rq_oi.oi_oa != NULL)
  70                         OBDO_FREE(req->rq_oi.oi_oa);
  71
  72                 if (req->rq_oi.oi_osfs != NULL)
  73                         OBD_FREE_PTR(req->rq_oi.oi_osfs);
  74
  75                 OBD_FREE_PTR(req);
  76         }
  77
  78         OBD_FREE_PTR(set);
  79         EXIT;
  80 }
  81
  82 int lov_set_finished(struct lov_request_set *set, int idempotent)
  83 {
  84         int completes = atomic_read(&set->set_completes);
  85
  86         CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
  87
  88         if (completes == set->set_count) {
  89                 if (idempotent)
  90                         return 1;
  91                 if (atomic_inc_return(&set->set_finish_checked) == 1)
  92                         return 1;
  93         }
  94         return 0;
  95 }
  96
  97 void lov_update_set(struct lov_request_set *set,
  98                     struct lov_request *req, int rc)
  99 {
 100         req->rq_complete = 1;
 101         req->rq_rc = rc;
 102
 103         atomic_inc(&set->set_completes);
 104         if (rc == 0)
 105                 atomic_inc(&set->set_success);
 106
 107         wake_up(&set->set_waitq);
 108 }
 109
 110 int lov_update_common_set(struct lov_request_set *set,
 111                           struct lov_request *req, int rc)
 112 {
 113         struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
 114         ENTRY;
 115
 116         lov_update_set(set, req, rc);
 117
 118         /* grace error on inactive ost */
 119         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 120                     lov->lov_tgts[req->rq_idx]->ltd_active))
 121                 rc = 0;
 122
 123         /* FIXME in raid1 regime, should return 0 */
 124         RETURN(rc);
 125 }
 126
 127 void lov_set_add_req(struct lov_request *req, struct lov_request_set *set)
 128 {
 129         list_add_tail(&req->rq_link, &set->set_list);
 130         set->set_count++;
 131         req->rq_rqset = set;
 132 }
 133
 134 static int lov_check_set(struct lov_obd *lov, int idx)
 135 {
 136         int rc = 0;
 137         mutex_lock(&lov->lov_lock);
 138
 139         if (lov->lov_tgts[idx] == NULL ||
 140             lov->lov_tgts[idx]->ltd_active ||
 141             (lov->lov_tgts[idx]->ltd_exp != NULL &&
 142              class_exp2cliimp(lov->lov_tgts[idx]->ltd_exp)->imp_connect_tried))
 143                 rc = 1;
 144
 145         mutex_unlock(&lov->lov_lock);
 146         return rc;
 147 }
 148
 149 /* Check if the OSC connection exists and is active.
 150  * If the OSC has not yet had a chance to connect to the OST the first time,
 151  * wait once for it to connect instead of returning an error.
 152  */
 153 int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 154 {
 155         wait_queue_head_t waitq;
 156         struct l_wait_info lwi;
 157         struct lov_tgt_desc *tgt;
 158         int rc = 0;
 159
 160         mutex_lock(&lov->lov_lock);
 161
 162         tgt = lov->lov_tgts[ost_idx];
 163
 164         if (unlikely(tgt == NULL))
 165                 GOTO(out, rc = 0);
 166
 167         if (likely(tgt->ltd_active))
 168                 GOTO(out, rc = 1);
 169
 170         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried)
 171                 GOTO(out, rc = 0);
 172
 173         mutex_unlock(&lov->lov_lock);
 174
 175         init_waitqueue_head(&waitq);
 176         lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
 177                                    cfs_time_seconds(1), NULL, NULL);
 178
 179         rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
 180         if (tgt->ltd_active)
 181                 return 1;
 182
 183         return 0;
 184
 185 out:
 186         mutex_unlock(&lov->lov_lock);
 187         return rc;
 188 }
 189
 190 static int common_attr_done(struct lov_request_set *set)
 191 {
 192         struct list_head *pos;
 193         struct lov_request *req;
 194         struct obdo *tmp_oa;
 195         int rc = 0, attrset = 0;
 196         ENTRY;
 197
 198         LASSERT(set->set_oi != NULL);
 199
 200         if (set->set_oi->oi_oa == NULL)
 201                 RETURN(0);
 202
 203         if (!atomic_read(&set->set_success))
 204                 RETURN(-EIO);
 205
 206         OBDO_ALLOC(tmp_oa);
 207         if (tmp_oa == NULL)
 208                 GOTO(out, rc = -ENOMEM);
 209
 210         list_for_each(pos, &set->set_list) {
 211                 req = list_entry(pos, struct lov_request, rq_link);
 212
 213                 if (!req->rq_complete || req->rq_rc)
 214                         continue;
 215                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 216                         continue;
 217                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 218                                 req->rq_oi.oi_oa->o_valid,
 219                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 220         }
 221         if (!attrset) {
 222                 CERROR("No stripes had valid attrs\n");
 223                 rc = -EIO;
 224         }
 225
 226         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 227         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 228 out:
 229         if (tmp_oa)
 230                 OBDO_FREE(tmp_oa);
 231         RETURN(rc);
 232
 233 }
 234
 235 int lov_fini_getattr_set(struct lov_request_set *set)
 236 {
 237         int rc = 0;
 238         ENTRY;
 239
 240         if (set == NULL)
 241                 RETURN(0);
 242         LASSERT(set->set_exp);
 243         if (atomic_read(&set->set_completes))
 244                 rc = common_attr_done(set);
 245
 246         lov_put_reqset(set);
 247
 248         RETURN(rc);
 249 }
 250
 251 /* The callback for osc_getattr_async that finilizes a request info when a
 252  * response is received. */
 253 static int cb_getattr_update(void *cookie, int rc)
 254 {
 255         struct obd_info *oinfo = cookie;
 256         struct lov_request *lovreq;
 257         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 258         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 259 }
 260
 261 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 262                          struct lov_request_set **reqset)
 263 {
 264         struct lov_request_set *set;
 265         struct lov_obd *lov = &exp->exp_obd->u.lov;
 266         int rc = 0, i;
 267         ENTRY;
 268
 269         OBD_ALLOC(set, sizeof(*set));
 270         if (set == NULL)
 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                         continue;
 288                 }
 289
 290                 OBD_ALLOC(req, sizeof(*req));
 291                 if (req == NULL)
 292                         GOTO(out_set, rc = -ENOMEM);
 293
 294                 req->rq_stripe = i;
 295                 req->rq_idx = loi->loi_ost_idx;
 296
 297                 OBDO_ALLOC(req->rq_oi.oi_oa);
 298                 if (req->rq_oi.oi_oa == NULL) {
 299                         OBD_FREE(req, sizeof(*req));
 300                         GOTO(out_set, rc = -ENOMEM);
 301                 }
 302                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 303                        sizeof(*req->rq_oi.oi_oa));
 304                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 305                 req->rq_oi.oi_cb_up = cb_getattr_update;
 306                 req->rq_oi.oi_capa = oinfo->oi_capa;
 307
 308                 lov_set_add_req(req, set);
 309         }
 310         if (!set->set_count)
 311                 GOTO(out_set, rc = -EIO);
 312         *reqset = set;
 313         RETURN(rc);
 314 out_set:
 315         lov_fini_getattr_set(set);
 316         RETURN(rc);
 317 }
 318
 319 int lov_fini_setattr_set(struct lov_request_set *set)
 320 {
 321         int rc = 0;
 322         ENTRY;
 323
 324         if (set == NULL)
 325                 RETURN(0);
 326         LASSERT(set->set_exp);
 327         if (atomic_read(&set->set_completes)) {
 328                 rc = common_attr_done(set);
 329                 /* FIXME update qos data here */
 330         }
 331
 332         lov_put_reqset(set);
 333         RETURN(rc);
 334 }
 335
 336 int lov_update_setattr_set(struct lov_request_set *set,
 337                            struct lov_request *req, int rc)
 338 {
 339         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 340         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 341         ENTRY;
 342
 343         lov_update_set(set, req, rc);
 344
 345         /* grace error on inactive ost */
 346         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 347                     lov->lov_tgts[req->rq_idx]->ltd_active))
 348                 rc = 0;
 349
 350         if (rc == 0) {
 351                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 352                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 353                                 req->rq_oi.oi_oa->o_ctime;
 354                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 355                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 356                                 req->rq_oi.oi_oa->o_mtime;
 357                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 358                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 359                                 req->rq_oi.oi_oa->o_atime;
 360         }
 361
 362         RETURN(rc);
 363 }
 364
 365 /* The callback for osc_setattr_async that finilizes a request info when a
 366  * response is received. */
 367 static int cb_setattr_update(void *cookie, int rc)
 368 {
 369         struct obd_info *oinfo = cookie;
 370         struct lov_request *lovreq;
 371         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 372         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 373 }
 374
 375 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 376                          struct obd_trans_info *oti,
 377                          struct lov_request_set **reqset)
 378 {
 379         struct lov_request_set *set;
 380         struct lov_obd *lov = &exp->exp_obd->u.lov;
 381         int rc = 0, i;
 382         ENTRY;
 383
 384         OBD_ALLOC(set, sizeof(*set));
 385         if (set == NULL)
 386                 RETURN(-ENOMEM);
 387         lov_init_set(set);
 388
 389         set->set_exp = exp;
 390         set->set_oi = oinfo;
 391         if (oti != NULL && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 392                 set->set_cookies = oti->oti_logcookies;
 393
 394         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 395                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 396                 struct lov_request *req;
 397
 398                 if (lov_oinfo_is_dummy(loi))
 399                         continue;
 400
 401                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 402                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 403                         continue;
 404                 }
 405
 406                 OBD_ALLOC(req, sizeof(*req));
 407                 if (req == NULL)
 408                         GOTO(out_set, rc = -ENOMEM);
 409                 req->rq_stripe = i;
 410                 req->rq_idx = loi->loi_ost_idx;
 411
 412                 OBDO_ALLOC(req->rq_oi.oi_oa);
 413                 if (req->rq_oi.oi_oa == NULL) {
 414                         OBD_FREE(req, sizeof(*req));
 415                         GOTO(out_set, rc = -ENOMEM);
 416                 }
 417                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 418                        sizeof(*req->rq_oi.oi_oa));
 419                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 420                 req->rq_oi.oi_oa->o_stripe_idx = i;
 421                 req->rq_oi.oi_cb_up = cb_setattr_update;
 422                 req->rq_oi.oi_capa = oinfo->oi_capa;
 423
 424                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 425                         int off = lov_stripe_offset(oinfo->oi_md,
 426                                                     oinfo->oi_oa->o_size, i,
 427                                                     &req->rq_oi.oi_oa->o_size);
 428
 429                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 430                                 req->rq_oi.oi_oa->o_size--;
 431
 432                         CDEBUG(D_INODE, "stripe %d has size "LPU64"/"LPU64"\n",
 433                                i, req->rq_oi.oi_oa->o_size,
 434                                oinfo->oi_oa->o_size);
 435                 }
 436                 lov_set_add_req(req, set);
 437         }
 438         if (!set->set_count)
 439                 GOTO(out_set, rc = -EIO);
 440         *reqset = set;
 441         RETURN(rc);
 442 out_set:
 443         lov_fini_setattr_set(set);
 444         RETURN(rc);
 445 }
 446
 447 #define LOV_U64_MAX ((__u64)~0ULL)
 448 #define LOV_SUM_MAX(tot, add)                                           \
 449         do {                                                            \
 450                 if ((tot) + (add) < (tot))                              \
 451                         (tot) = LOV_U64_MAX;                            \
 452                 else                                                    \
 453                         (tot) += (add);                                 \
 454         } while(0)
 455
 456 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,int success)
 457 {
 458         ENTRY;
 459
 460         if (success) {
 461                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 462                                                            LOV_MAGIC, 0);
 463                 if (osfs->os_files != LOV_U64_MAX)
 464                         lov_do_div64(osfs->os_files, expected_stripes);
 465                 if (osfs->os_ffree != LOV_U64_MAX)
 466                         lov_do_div64(osfs->os_ffree, expected_stripes);
 467
 468                 spin_lock(&obd->obd_osfs_lock);
 469                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 470                 obd->obd_osfs_age = cfs_time_current_64();
 471                 spin_unlock(&obd->obd_osfs_lock);
 472                 RETURN(0);
 473         }
 474
 475         RETURN(-EIO);
 476 }
 477
 478 int lov_fini_statfs_set(struct lov_request_set *set)
 479 {
 480         int rc = 0;
 481         ENTRY;
 482
 483         if (set == NULL)
 484                 RETURN(0);
 485
 486         if (atomic_read(&set->set_completes)) {
 487                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 488                                      atomic_read(&set->set_success));
 489         }
 490         lov_put_reqset(set);
 491         RETURN(rc);
 492 }
 493
 494 void lov_update_statfs(struct obd_statfs *osfs, struct obd_statfs *lov_sfs,
 495                        int success)
 496 {
 497         int shift = 0, quit = 0;
 498         __u64 tmp;
 499
 500         if (success == 0) {
 501                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 502         } else {
 503                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 504                         /* assume all block sizes are always powers of 2 */
 505                         /* get the bits difference */
 506                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 507                         for (shift = 0; shift <= 64; ++shift) {
 508                                 if (tmp & 1) {
 509                                         if (quit)
 510                                                 break;
 511                                         else
 512                                                 quit = 1;
 513                                         shift = 0;
 514                                 }
 515                                 tmp >>= 1;
 516                         }
 517                 }
 518
 519                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 520                         osfs->os_bsize = lov_sfs->os_bsize;
 521
 522                         osfs->os_bfree  >>= shift;
 523                         osfs->os_bavail >>= shift;
 524                         osfs->os_blocks >>= shift;
 525                 } else if (shift != 0) {
 526                         lov_sfs->os_bfree  >>= shift;
 527                         lov_sfs->os_bavail >>= shift;
 528                         lov_sfs->os_blocks >>= shift;
 529                 }
 530 #ifdef MIN_DF
 531                 /* Sandia requested that df (and so, statfs) only
 532                    returned minimal available space on
 533                    a single OST, so people would be able to
 534                    write this much data guaranteed. */
 535                 if (osfs->os_bavail > lov_sfs->os_bavail) {
 536                         /* Presumably if new bavail is smaller,
 537                            new bfree is bigger as well */
 538                         osfs->os_bfree = lov_sfs->os_bfree;
 539                         osfs->os_bavail = lov_sfs->os_bavail;
 540                 }
 541 #else
 542                 osfs->os_bfree += lov_sfs->os_bfree;
 543                 osfs->os_bavail += lov_sfs->os_bavail;
 544 #endif
 545                 osfs->os_blocks += lov_sfs->os_blocks;
 546                 /* XXX not sure about this one - depends on policy.
 547                  *   - could be minimum if we always stripe on all OBDs
 548                  *     (but that would be wrong for any other policy,
 549                  *     if one of the OBDs has no more objects left)
 550                  *   - could be sum if we stripe whole objects
 551                  *   - could be average, just to give a nice number
 552                  *
 553                  * To give a "reasonable" (if not wholly accurate)
 554                  * number, we divide the total number of free objects
 555                  * by expected stripe count (watch out for overflow).
 556                  */
 557                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 558                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 559         }
 560 }
 561
 562 /* The callback for osc_statfs_async that finilizes a request info when a
 563  * response is received. */
 564 static int cb_statfs_update(void *cookie, int rc)
 565 {
 566         struct obd_info *oinfo = cookie;
 567         struct lov_request *lovreq;
 568         struct lov_request_set *set;
 569         struct obd_statfs *osfs, *lov_sfs;
 570         struct lov_obd *lov;
 571         struct lov_tgt_desc *tgt;
 572         struct obd_device *lovobd, *tgtobd;
 573         int success;
 574         ENTRY;
 575
 576         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 577         set = lovreq->rq_rqset;
 578         lovobd = set->set_obd;
 579         lov = &lovobd->u.lov;
 580         osfs = set->set_oi->oi_osfs;
 581         lov_sfs = oinfo->oi_osfs;
 582         success = atomic_read(&set->set_success);
 583         /* XXX: the same is done in lov_update_common_set, however
 584            lovset->set_exp is not initialized. */
 585         lov_update_set(set, lovreq, rc);
 586         if (rc)
 587                 GOTO(out, rc);
 588
 589         obd_getref(lovobd);
 590         tgt = lov->lov_tgts[lovreq->rq_idx];
 591         if (!tgt || !tgt->ltd_active)
 592                 GOTO(out_update, rc);
 593
 594         tgtobd = class_exp2obd(tgt->ltd_exp);
 595         spin_lock(&tgtobd->obd_osfs_lock);
 596         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 597         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 598                 tgtobd->obd_osfs_age = cfs_time_current_64();
 599         spin_unlock(&tgtobd->obd_osfs_lock);
 600
 601 out_update:
 602         lov_update_statfs(osfs, lov_sfs, success);
 603         obd_putref(lovobd);
 604
 605 out:
 606         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 607             lov_set_finished(set, 0)) {
 608                 lov_statfs_interpret(NULL, set, set->set_count !=
 609                                      atomic_read(&set->set_success));
 610         }
 611
 612         RETURN(0);
 613 }
 614
 615 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 616                         struct lov_request_set **reqset)
 617 {
 618         struct lov_request_set *set;
 619         struct lov_obd *lov = &obd->u.lov;
 620         int rc = 0, i;
 621         ENTRY;
 622
 623         OBD_ALLOC(set, sizeof(*set));
 624         if (set == NULL)
 625                 RETURN(-ENOMEM);
 626         lov_init_set(set);
 627
 628         set->set_obd = obd;
 629         set->set_oi = oinfo;
 630
 631         /* We only get block data from the OBD */
 632         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 633                 struct lov_request *req;
 634
 635                 if (lov->lov_tgts[i] == NULL ||
 636                     (oinfo->oi_flags & OBD_STATFS_NODELAY &&
 637                      !lov->lov_tgts[i]->ltd_active)) {
 638                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 639                         continue;
 640                 }
 641
 642                 if (!lov->lov_tgts[i]->ltd_active)
 643                         lov_check_and_wait_active(lov, i);
 644
 645                 /* skip targets that have been explicitely disabled by the
 646                  * administrator */
 647                 if (!lov->lov_tgts[i]->ltd_exp) {
 648                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 649                         continue;
 650                 }
 651
 652                 OBD_ALLOC(req, sizeof(*req));
 653                 if (req == NULL)
 654                         GOTO(out_set, rc = -ENOMEM);
 655
 656                 OBD_ALLOC(req->rq_oi.oi_osfs, sizeof(*req->rq_oi.oi_osfs));
 657                 if (req->rq_oi.oi_osfs == NULL) {
 658                         OBD_FREE(req, sizeof(*req));
 659                         GOTO(out_set, rc = -ENOMEM);
 660                 }
 661
 662                 req->rq_idx = i;
 663                 req->rq_oi.oi_cb_up = cb_statfs_update;
 664                 req->rq_oi.oi_flags = oinfo->oi_flags;
 665
 666                 lov_set_add_req(req, set);
 667         }
 668         if (!set->set_count)
 669                 GOTO(out_set, rc = -EIO);
 670         *reqset = set;
 671         RETURN(rc);
 672 out_set:
 673         lov_fini_statfs_set(set);
 674         RETURN(rc);
 675 }