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_destroy_set(struct lov_request_set *set)
 329 {
 330         if (!set)
 331                 return 0;
 332         LASSERT(set->set_exp);
 333         if (atomic_read(&set->set_completes)) {
 334                 /* FIXME update qos data here */
 335         }
 336
 337         lov_put_reqset(set);
 338
 339         return 0;
 340 }
 341
 342 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 343                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 344                          struct obd_trans_info *oti,
 345                          struct lov_request_set **reqset)
 346 {
 347         struct lov_request_set *set;
 348         struct lov_obd *lov = &exp->exp_obd->u.lov;
 349         int rc = 0, i;
 350
 351         set = kzalloc(sizeof(*set), GFP_NOFS);
 352         if (!set)
 353                 return -ENOMEM;
 354         lov_init_set(set);
 355
 356         set->set_exp = exp;
 357         set->set_oi = oinfo;
 358         set->set_oi->oi_md = lsm;
 359         set->set_oi->oi_oa = src_oa;
 360         if (oti && src_oa->o_valid & OBD_MD_FLCOOKIE)
 361                 set->set_cookies = oti->oti_logcookies;
 362
 363         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 364                 struct lov_oinfo *loi;
 365                 struct lov_request *req;
 366
 367                 loi = lsm->lsm_oinfo[i];
 368                 if (lov_oinfo_is_dummy(loi))
 369                         continue;
 370
 371                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 372                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 373                         continue;
 374                 }
 375
 376                 req = kzalloc(sizeof(*req), GFP_NOFS);
 377                 if (!req) {
 378                         rc = -ENOMEM;
 379                         goto out_set;
 380                 }
 381
 382                 req->rq_stripe = i;
 383                 req->rq_idx = loi->loi_ost_idx;
 384
 385                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 386                 if (!req->rq_oi.oi_oa) {
 387                         kfree(req);
 388                         rc = -ENOMEM;
 389                         goto out_set;
 390                 }
 391                 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
 392                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 393                 lov_set_add_req(req, set);
 394         }
 395         if (!set->set_count) {
 396                 rc = -EIO;
 397                 goto out_set;
 398         }
 399         *reqset = set;
 400         return rc;
 401 out_set:
 402         lov_fini_destroy_set(set);
 403         return rc;
 404 }
 405
 406 int lov_fini_setattr_set(struct lov_request_set *set)
 407 {
 408         int rc = 0;
 409
 410         if (!set)
 411                 return 0;
 412         LASSERT(set->set_exp);
 413         if (atomic_read(&set->set_completes)) {
 414                 rc = common_attr_done(set);
 415                 /* FIXME update qos data here */
 416         }
 417
 418         lov_put_reqset(set);
 419         return rc;
 420 }
 421
 422 int lov_update_setattr_set(struct lov_request_set *set,
 423                            struct lov_request *req, int rc)
 424 {
 425         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 426         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 427
 428         lov_update_set(set, req, rc);
 429
 430         /* grace error on inactive ost */
 431         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 432                     lov->lov_tgts[req->rq_idx]->ltd_active))
 433                 rc = 0;
 434
 435         if (rc == 0) {
 436                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 437                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 438                                 req->rq_oi.oi_oa->o_ctime;
 439                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 440                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 441                                 req->rq_oi.oi_oa->o_mtime;
 442                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 443                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 444                                 req->rq_oi.oi_oa->o_atime;
 445         }
 446
 447         return rc;
 448 }
 449
 450 /* The callback for osc_setattr_async that finalizes a request info when a
 451  * response is received.
 452  */
 453 static int cb_setattr_update(void *cookie, int rc)
 454 {
 455         struct obd_info *oinfo = cookie;
 456         struct lov_request *lovreq;
 457
 458         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 459         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 460 }
 461
 462 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 463                          struct obd_trans_info *oti,
 464                          struct lov_request_set **reqset)
 465 {
 466         struct lov_request_set *set;
 467         struct lov_obd *lov = &exp->exp_obd->u.lov;
 468         int rc = 0, i;
 469
 470         set = kzalloc(sizeof(*set), GFP_NOFS);
 471         if (!set)
 472                 return -ENOMEM;
 473         lov_init_set(set);
 474
 475         set->set_exp = exp;
 476         set->set_oi = oinfo;
 477         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 478                 set->set_cookies = oti->oti_logcookies;
 479
 480         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 481                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 482                 struct lov_request *req;
 483
 484                 if (lov_oinfo_is_dummy(loi))
 485                         continue;
 486
 487                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 488                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 489                         continue;
 490                 }
 491
 492                 req = kzalloc(sizeof(*req), GFP_NOFS);
 493                 if (!req) {
 494                         rc = -ENOMEM;
 495                         goto out_set;
 496                 }
 497                 req->rq_stripe = i;
 498                 req->rq_idx = loi->loi_ost_idx;
 499
 500                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 501                 if (!req->rq_oi.oi_oa) {
 502                         kfree(req);
 503                         rc = -ENOMEM;
 504                         goto out_set;
 505                 }
 506                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 507                        sizeof(*req->rq_oi.oi_oa));
 508                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 509                 req->rq_oi.oi_oa->o_stripe_idx = i;
 510                 req->rq_oi.oi_cb_up = cb_setattr_update;
 511
 512                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 513                         int off = lov_stripe_offset(oinfo->oi_md,
 514                                                     oinfo->oi_oa->o_size, i,
 515                                                     &req->rq_oi.oi_oa->o_size);
 516
 517                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 518                                 req->rq_oi.oi_oa->o_size--;
 519
 520                         CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
 521                                i, req->rq_oi.oi_oa->o_size,
 522                                oinfo->oi_oa->o_size);
 523                 }
 524                 lov_set_add_req(req, set);
 525         }
 526         if (!set->set_count) {
 527                 rc = -EIO;
 528                 goto out_set;
 529         }
 530         *reqset = set;
 531         return rc;
 532 out_set:
 533         lov_fini_setattr_set(set);
 534         return rc;
 535 }
 536
 537 #define LOV_U64_MAX ((__u64)~0ULL)
 538 #define LOV_SUM_MAX(tot, add)                                      \
 539         do {                                                        \
 540                 if ((tot) + (add) < (tot))                            \
 541                         (tot) = LOV_U64_MAX;                        \
 542                 else                                                \
 543                         (tot) += (add);                          \
 544         } while (0)
 545
 546 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 547                     int success)
 548 {
 549         if (success) {
 550                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 551                                                            LOV_MAGIC, 0);
 552                 if (osfs->os_files != LOV_U64_MAX)
 553                         lov_do_div64(osfs->os_files, expected_stripes);
 554                 if (osfs->os_ffree != LOV_U64_MAX)
 555                         lov_do_div64(osfs->os_ffree, expected_stripes);
 556
 557                 spin_lock(&obd->obd_osfs_lock);
 558                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 559                 obd->obd_osfs_age = cfs_time_current_64();
 560                 spin_unlock(&obd->obd_osfs_lock);
 561                 return 0;
 562         }
 563
 564         return -EIO;
 565 }
 566
 567 int lov_fini_statfs_set(struct lov_request_set *set)
 568 {
 569         int rc = 0;
 570
 571         if (!set)
 572                 return 0;
 573
 574         if (atomic_read(&set->set_completes)) {
 575                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 576                                      atomic_read(&set->set_success));
 577         }
 578         lov_put_reqset(set);
 579         return rc;
 580 }
 581
 582 static void lov_update_statfs(struct obd_statfs *osfs,
 583                               struct obd_statfs *lov_sfs,
 584                               int success)
 585 {
 586         int shift = 0, quit = 0;
 587         __u64 tmp;
 588
 589         if (success == 0) {
 590                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 591         } else {
 592                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 593                         /* assume all block sizes are always powers of 2 */
 594                         /* get the bits difference */
 595                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 596                         for (shift = 0; shift <= 64; ++shift) {
 597                                 if (tmp & 1) {
 598                                         if (quit)
 599                                                 break;
 600                                         quit = 1;
 601                                         shift = 0;
 602                                 }
 603                                 tmp >>= 1;
 604                         }
 605                 }
 606
 607                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 608                         osfs->os_bsize = lov_sfs->os_bsize;
 609
 610                         osfs->os_bfree  >>= shift;
 611                         osfs->os_bavail >>= shift;
 612                         osfs->os_blocks >>= shift;
 613                 } else if (shift != 0) {
 614                         lov_sfs->os_bfree  >>= shift;
 615                         lov_sfs->os_bavail >>= shift;
 616                         lov_sfs->os_blocks >>= shift;
 617                 }
 618                 osfs->os_bfree += lov_sfs->os_bfree;
 619                 osfs->os_bavail += lov_sfs->os_bavail;
 620                 osfs->os_blocks += lov_sfs->os_blocks;
 621                 /* XXX not sure about this one - depends on policy.
 622                  *   - could be minimum if we always stripe on all OBDs
 623                  *     (but that would be wrong for any other policy,
 624                  *     if one of the OBDs has no more objects left)
 625                  *   - could be sum if we stripe whole objects
 626                  *   - could be average, just to give a nice number
 627                  *
 628                  * To give a "reasonable" (if not wholly accurate)
 629                  * number, we divide the total number of free objects
 630                  * by expected stripe count (watch out for overflow).
 631                  */
 632                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 633                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 634         }
 635 }
 636
 637 /* The callback for osc_statfs_async that finalizes a request info when a
 638  * response is received.
 639  */
 640 static int cb_statfs_update(void *cookie, int rc)
 641 {
 642         struct obd_info *oinfo = cookie;
 643         struct lov_request *lovreq;
 644         struct lov_request_set *set;
 645         struct obd_statfs *osfs, *lov_sfs;
 646         struct lov_obd *lov;
 647         struct lov_tgt_desc *tgt;
 648         struct obd_device *lovobd, *tgtobd;
 649         int success;
 650
 651         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 652         set = lovreq->rq_rqset;
 653         lovobd = set->set_obd;
 654         lov = &lovobd->u.lov;
 655         osfs = set->set_oi->oi_osfs;
 656         lov_sfs = oinfo->oi_osfs;
 657         success = atomic_read(&set->set_success);
 658         /* XXX: the same is done in lov_update_common_set, however
 659          * lovset->set_exp is not initialized.
 660          */
 661         lov_update_set(set, lovreq, rc);
 662         if (rc)
 663                 goto out;
 664
 665         obd_getref(lovobd);
 666         tgt = lov->lov_tgts[lovreq->rq_idx];
 667         if (!tgt || !tgt->ltd_active)
 668                 goto out_update;
 669
 670         tgtobd = class_exp2obd(tgt->ltd_exp);
 671         spin_lock(&tgtobd->obd_osfs_lock);
 672         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 673         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 674                 tgtobd->obd_osfs_age = cfs_time_current_64();
 675         spin_unlock(&tgtobd->obd_osfs_lock);
 676
 677 out_update:
 678         lov_update_statfs(osfs, lov_sfs, success);
 679         obd_putref(lovobd);
 680
 681 out:
 682         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 683             lov_set_finished(set, 0)) {
 684                 lov_statfs_interpret(NULL, set, set->set_count !=
 685                                      atomic_read(&set->set_success));
 686         }
 687
 688         return 0;
 689 }
 690
 691 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 692                         struct lov_request_set **reqset)
 693 {
 694         struct lov_request_set *set;
 695         struct lov_obd *lov = &obd->u.lov;
 696         int rc = 0, i;
 697
 698         set = kzalloc(sizeof(*set), GFP_NOFS);
 699         if (!set)
 700                 return -ENOMEM;
 701         lov_init_set(set);
 702
 703         set->set_obd = obd;
 704         set->set_oi = oinfo;
 705
 706         /* We only get block data from the OBD */
 707         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 708                 struct lov_request *req;
 709
 710                 if (!lov->lov_tgts[i] ||
 711                     (oinfo->oi_flags & OBD_STATFS_NODELAY &&
 712                      !lov->lov_tgts[i]->ltd_active)) {
 713                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 714                         continue;
 715                 }
 716
 717                 if (!lov->lov_tgts[i]->ltd_active)
 718                         lov_check_and_wait_active(lov, i);
 719
 720                 /* skip targets that have been explicitly disabled by the
 721                  * administrator
 722                  */
 723                 if (!lov->lov_tgts[i]->ltd_exp) {
 724                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 725                         continue;
 726                 }
 727
 728                 req = kzalloc(sizeof(*req), GFP_NOFS);
 729                 if (!req) {
 730                         rc = -ENOMEM;
 731                         goto out_set;
 732                 }
 733
 734                 req->rq_oi.oi_osfs = kzalloc(sizeof(*req->rq_oi.oi_osfs),
 735                                              GFP_NOFS);
 736                 if (!req->rq_oi.oi_osfs) {
 737                         kfree(req);
 738                         rc = -ENOMEM;
 739                         goto out_set;
 740                 }
 741
 742                 req->rq_idx = i;
 743                 req->rq_oi.oi_cb_up = cb_statfs_update;
 744                 req->rq_oi.oi_flags = oinfo->oi_flags;
 745
 746                 lov_set_add_req(req, set);
 747         }
 748         if (!set->set_count) {
 749                 rc = -EIO;
 750                 goto out_set;
 751         }
 752         *reqset = set;
 753         return rc;
 754 out_set:
 755         lov_fini_statfs_set(set);
 756         return rc;
 757 }