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.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, 2015, 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 "../../include/linux/libcfs/libcfs.h"
  40
  41 #include "../include/obd_class.h"
  42 #include "../include/lustre/lustre_idl.h"
  43 #include "lov_internal.h"
  44
  45 static void lov_init_set(struct lov_request_set *set)
  46 {
  47         set->set_count = 0;
  48         atomic_set(&set->set_completes, 0);
  49         atomic_set(&set->set_success, 0);
  50         atomic_set(&set->set_finish_checked, 0);
  51         set->set_cookies = NULL;
  52         INIT_LIST_HEAD(&set->set_list);
  53         atomic_set(&set->set_refcount, 1);
  54         init_waitqueue_head(&set->set_waitq);
  55 }
  56
  57 void lov_finish_set(struct lov_request_set *set)
  58 {
  59         struct list_head *pos, *n;
  60
  61         LASSERT(set);
  62         list_for_each_safe(pos, n, &set->set_list) {
  63                 struct lov_request *req = list_entry(pos,
  64                                                          struct lov_request,
  65                                                          rq_link);
  66                 list_del_init(&req->rq_link);
  67
  68                 if (req->rq_oi.oi_oa)
  69                         kmem_cache_free(obdo_cachep, req->rq_oi.oi_oa);
  70                 kfree(req->rq_oi.oi_osfs);
  71                 kfree(req);
  72         }
  73         kfree(set);
  74 }
  75
  76 static int lov_set_finished(struct lov_request_set *set, int idempotent)
  77 {
  78         int completes = atomic_read(&set->set_completes);
  79
  80         CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
  81
  82         if (completes == set->set_count) {
  83                 if (idempotent)
  84                         return 1;
  85                 if (atomic_inc_return(&set->set_finish_checked) == 1)
  86                         return 1;
  87         }
  88         return 0;
  89 }
  90
  91 static void lov_update_set(struct lov_request_set *set,
  92                            struct lov_request *req, int rc)
  93 {
  94         req->rq_complete = 1;
  95         req->rq_rc = rc;
  96
  97         atomic_inc(&set->set_completes);
  98         if (rc == 0)
  99                 atomic_inc(&set->set_success);
 100
 101         wake_up(&set->set_waitq);
 102 }
 103
 104 int lov_update_common_set(struct lov_request_set *set,
 105                           struct lov_request *req, int rc)
 106 {
 107         struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
 108
 109         lov_update_set(set, req, rc);
 110
 111         /* grace error on inactive ost */
 112         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 113                     lov->lov_tgts[req->rq_idx]->ltd_active))
 114                 rc = 0;
 115
 116         /* FIXME in raid1 regime, should return 0 */
 117         return rc;
 118 }
 119
 120 static void lov_set_add_req(struct lov_request *req,
 121                             struct lov_request_set *set)
 122 {
 123         list_add_tail(&req->rq_link, &set->set_list);
 124         set->set_count++;
 125         req->rq_rqset = set;
 126 }
 127
 128 static int lov_check_set(struct lov_obd *lov, int idx)
 129 {
 130         int rc;
 131         struct lov_tgt_desc *tgt;
 132
 133         mutex_lock(&lov->lov_lock);
 134         tgt = lov->lov_tgts[idx];
 135         rc = !tgt || tgt->ltd_active ||
 136                 (tgt->ltd_exp &&
 137                  class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried);
 138         mutex_unlock(&lov->lov_lock);
 139
 140         return rc;
 141 }
 142
 143 /* Check if the OSC connection exists and is active.
 144  * If the OSC has not yet had a chance to connect to the OST the first time,
 145  * wait once for it to connect instead of returning an error.
 146  */
 147 static int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 148 {
 149         wait_queue_head_t waitq;
 150         struct l_wait_info lwi;
 151         struct lov_tgt_desc *tgt;
 152         int rc = 0;
 153
 154         mutex_lock(&lov->lov_lock);
 155
 156         tgt = lov->lov_tgts[ost_idx];
 157
 158         if (unlikely(!tgt)) {
 159                 rc = 0;
 160                 goto out;
 161         }
 162
 163         if (likely(tgt->ltd_active)) {
 164                 rc = 1;
 165                 goto out;
 166         }
 167
 168         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried) {
 169                 rc = 0;
 170                 goto out;
 171         }
 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 lov_request *req;
 193         struct obdo *tmp_oa;
 194         int rc = 0, attrset = 0;
 195
 196         if (!set->set_oi->oi_oa)
 197                 return 0;
 198
 199         if (!atomic_read(&set->set_success))
 200                 return -EIO;
 201
 202         tmp_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 203         if (!tmp_oa) {
 204                 rc = -ENOMEM;
 205                 goto out;
 206         }
 207
 208         list_for_each_entry(req, &set->set_list, rq_link) {
 209                 if (!req->rq_complete || req->rq_rc)
 210                         continue;
 211                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 212                         continue;
 213                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 214                                 req->rq_oi.oi_oa->o_valid,
 215                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 216         }
 217         if (!attrset) {
 218                 CERROR("No stripes had valid attrs\n");
 219                 rc = -EIO;
 220         }
 221         if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
 222             (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
 223                 /* When we take attributes of some epoch, we require all the
 224                  * ost to be active.
 225                  */
 226                 CERROR("Not all the stripes had valid attrs\n");
 227                 rc = -EIO;
 228                 goto out;
 229         }
 230
 231         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 232         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 233 out:
 234         if (tmp_oa)
 235                 kmem_cache_free(obdo_cachep, tmp_oa);
 236         return rc;
 237 }
 238
 239 int lov_fini_getattr_set(struct lov_request_set *set)
 240 {
 241         int rc = 0;
 242
 243         if (!set)
 244                 return 0;
 245         LASSERT(set->set_exp);
 246         if (atomic_read(&set->set_completes))
 247                 rc = common_attr_done(set);
 248
 249         lov_put_reqset(set);
 250
 251         return rc;
 252 }
 253
 254 /* The callback for osc_getattr_async that finalizes a request info when a
 255  * response is received.
 256  */
 257 static int cb_getattr_update(void *cookie, int rc)
 258 {
 259         struct obd_info *oinfo = cookie;
 260         struct lov_request *lovreq;
 261
 262         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 263         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 264 }
 265
 266 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 267                          struct lov_request_set **reqset)
 268 {
 269         struct lov_request_set *set;
 270         struct lov_obd *lov = &exp->exp_obd->u.lov;
 271         int rc = 0, i;
 272
 273         set = kzalloc(sizeof(*set), GFP_NOFS);
 274         if (!set)
 275                 return -ENOMEM;
 276         lov_init_set(set);
 277
 278         set->set_exp = exp;
 279         set->set_oi = oinfo;
 280
 281         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 282                 struct lov_oinfo *loi;
 283                 struct lov_request *req;
 284
 285                 loi = oinfo->oi_md->lsm_oinfo[i];
 286                 if (lov_oinfo_is_dummy(loi))
 287                         continue;
 288
 289                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 290                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 291                         if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH) {
 292                                 /* SOM requires all the OSTs to be active. */
 293                                 rc = -EIO;
 294                                 goto out_set;
 295                         }
 296                         continue;
 297                 }
 298
 299                 req = kzalloc(sizeof(*req), GFP_NOFS);
 300                 if (!req) {
 301                         rc = -ENOMEM;
 302                         goto out_set;
 303                 }
 304
 305                 req->rq_stripe = i;
 306                 req->rq_idx = loi->loi_ost_idx;
 307
 308                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 309                 if (!req->rq_oi.oi_oa) {
 310                         kfree(req);
 311                         rc = -ENOMEM;
 312                         goto out_set;
 313                 }
 314                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 315                        sizeof(*req->rq_oi.oi_oa));
 316                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 317                 req->rq_oi.oi_cb_up = cb_getattr_update;
 318
 319                 lov_set_add_req(req, set);
 320         }
 321         if (!set->set_count) {
 322                 rc = -EIO;
 323                 goto out_set;
 324         }
 325         *reqset = set;
 326         return rc;
 327 out_set:
 328         lov_fini_getattr_set(set);
 329         return rc;
 330 }
 331
 332 int lov_fini_destroy_set(struct lov_request_set *set)
 333 {
 334         if (!set)
 335                 return 0;
 336         LASSERT(set->set_exp);
 337         if (atomic_read(&set->set_completes)) {
 338                 /* FIXME update qos data here */
 339         }
 340
 341         lov_put_reqset(set);
 342
 343         return 0;
 344 }
 345
 346 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 347                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 348                          struct obd_trans_info *oti,
 349                          struct lov_request_set **reqset)
 350 {
 351         struct lov_request_set *set;
 352         struct lov_obd *lov = &exp->exp_obd->u.lov;
 353         int rc = 0, i;
 354
 355         set = kzalloc(sizeof(*set), GFP_NOFS);
 356         if (!set)
 357                 return -ENOMEM;
 358         lov_init_set(set);
 359
 360         set->set_exp = exp;
 361         set->set_oi = oinfo;
 362         set->set_oi->oi_md = lsm;
 363         set->set_oi->oi_oa = src_oa;
 364         if (oti && src_oa->o_valid & OBD_MD_FLCOOKIE)
 365                 set->set_cookies = oti->oti_logcookies;
 366
 367         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 368                 struct lov_oinfo *loi;
 369                 struct lov_request *req;
 370
 371                 loi = lsm->lsm_oinfo[i];
 372                 if (lov_oinfo_is_dummy(loi))
 373                         continue;
 374
 375                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 376                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 377                         continue;
 378                 }
 379
 380                 req = kzalloc(sizeof(*req), GFP_NOFS);
 381                 if (!req) {
 382                         rc = -ENOMEM;
 383                         goto out_set;
 384                 }
 385
 386                 req->rq_stripe = i;
 387                 req->rq_idx = loi->loi_ost_idx;
 388
 389                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 390                 if (!req->rq_oi.oi_oa) {
 391                         kfree(req);
 392                         rc = -ENOMEM;
 393                         goto out_set;
 394                 }
 395                 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
 396                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 397                 lov_set_add_req(req, set);
 398         }
 399         if (!set->set_count) {
 400                 rc = -EIO;
 401                 goto out_set;
 402         }
 403         *reqset = set;
 404         return rc;
 405 out_set:
 406         lov_fini_destroy_set(set);
 407         return rc;
 408 }
 409
 410 int lov_fini_setattr_set(struct lov_request_set *set)
 411 {
 412         int rc = 0;
 413
 414         if (!set)
 415                 return 0;
 416         LASSERT(set->set_exp);
 417         if (atomic_read(&set->set_completes)) {
 418                 rc = common_attr_done(set);
 419                 /* FIXME update qos data here */
 420         }
 421
 422         lov_put_reqset(set);
 423         return rc;
 424 }
 425
 426 int lov_update_setattr_set(struct lov_request_set *set,
 427                            struct lov_request *req, int rc)
 428 {
 429         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 430         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 431
 432         lov_update_set(set, req, rc);
 433
 434         /* grace error on inactive ost */
 435         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 436                     lov->lov_tgts[req->rq_idx]->ltd_active))
 437                 rc = 0;
 438
 439         if (rc == 0) {
 440                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 441                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 442                                 req->rq_oi.oi_oa->o_ctime;
 443                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 444                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 445                                 req->rq_oi.oi_oa->o_mtime;
 446                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 447                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 448                                 req->rq_oi.oi_oa->o_atime;
 449         }
 450
 451         return rc;
 452 }
 453
 454 /* The callback for osc_setattr_async that finalizes a request info when a
 455  * response is received.
 456  */
 457 static int cb_setattr_update(void *cookie, int rc)
 458 {
 459         struct obd_info *oinfo = cookie;
 460         struct lov_request *lovreq;
 461
 462         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 463         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 464 }
 465
 466 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 467                          struct obd_trans_info *oti,
 468                          struct lov_request_set **reqset)
 469 {
 470         struct lov_request_set *set;
 471         struct lov_obd *lov = &exp->exp_obd->u.lov;
 472         int rc = 0, i;
 473
 474         set = kzalloc(sizeof(*set), GFP_NOFS);
 475         if (!set)
 476                 return -ENOMEM;
 477         lov_init_set(set);
 478
 479         set->set_exp = exp;
 480         set->set_oi = oinfo;
 481         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 482                 set->set_cookies = oti->oti_logcookies;
 483
 484         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 485                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 486                 struct lov_request *req;
 487
 488                 if (lov_oinfo_is_dummy(loi))
 489                         continue;
 490
 491                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 492                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 493                         continue;
 494                 }
 495
 496                 req = kzalloc(sizeof(*req), GFP_NOFS);
 497                 if (!req) {
 498                         rc = -ENOMEM;
 499                         goto out_set;
 500                 }
 501                 req->rq_stripe = i;
 502                 req->rq_idx = loi->loi_ost_idx;
 503
 504                 req->rq_oi.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 505                 if (!req->rq_oi.oi_oa) {
 506                         kfree(req);
 507                         rc = -ENOMEM;
 508                         goto out_set;
 509                 }
 510                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 511                        sizeof(*req->rq_oi.oi_oa));
 512                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 513                 req->rq_oi.oi_oa->o_stripe_idx = i;
 514                 req->rq_oi.oi_cb_up = cb_setattr_update;
 515
 516                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 517                         int off = lov_stripe_offset(oinfo->oi_md,
 518                                                     oinfo->oi_oa->o_size, i,
 519                                                     &req->rq_oi.oi_oa->o_size);
 520
 521                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 522                                 req->rq_oi.oi_oa->o_size--;
 523
 524                         CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
 525                                i, req->rq_oi.oi_oa->o_size,
 526                                oinfo->oi_oa->o_size);
 527                 }
 528                 lov_set_add_req(req, set);
 529         }
 530         if (!set->set_count) {
 531                 rc = -EIO;
 532                 goto out_set;
 533         }
 534         *reqset = set;
 535         return rc;
 536 out_set:
 537         lov_fini_setattr_set(set);
 538         return rc;
 539 }
 540
 541 #define LOV_U64_MAX ((__u64)~0ULL)
 542 #define LOV_SUM_MAX(tot, add)                                      \
 543         do {                                                        \
 544                 if ((tot) + (add) < (tot))                            \
 545                         (tot) = LOV_U64_MAX;                        \
 546                 else                                                \
 547                         (tot) += (add);                          \
 548         } while (0)
 549
 550 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 551                     int success)
 552 {
 553         if (success) {
 554                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 555                                                            LOV_MAGIC, 0);
 556                 if (osfs->os_files != LOV_U64_MAX)
 557                         lov_do_div64(osfs->os_files, expected_stripes);
 558                 if (osfs->os_ffree != LOV_U64_MAX)
 559                         lov_do_div64(osfs->os_ffree, expected_stripes);
 560
 561                 spin_lock(&obd->obd_osfs_lock);
 562                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 563                 obd->obd_osfs_age = cfs_time_current_64();
 564                 spin_unlock(&obd->obd_osfs_lock);
 565                 return 0;
 566         }
 567
 568         return -EIO;
 569 }
 570
 571 int lov_fini_statfs_set(struct lov_request_set *set)
 572 {
 573         int rc = 0;
 574
 575         if (!set)
 576                 return 0;
 577
 578         if (atomic_read(&set->set_completes)) {
 579                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 580                                      atomic_read(&set->set_success));
 581         }
 582         lov_put_reqset(set);
 583         return rc;
 584 }
 585
 586 static void lov_update_statfs(struct obd_statfs *osfs,
 587                               struct obd_statfs *lov_sfs,
 588                               int success)
 589 {
 590         int shift = 0, quit = 0;
 591         __u64 tmp;
 592
 593         if (success == 0) {
 594                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 595         } else {
 596                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 597                         /* assume all block sizes are always powers of 2 */
 598                         /* get the bits difference */
 599                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 600                         for (shift = 0; shift <= 64; ++shift) {
 601                                 if (tmp & 1) {
 602                                         if (quit)
 603                                                 break;
 604                                         quit = 1;
 605                                         shift = 0;
 606                                 }
 607                                 tmp >>= 1;
 608                         }
 609                 }
 610
 611                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 612                         osfs->os_bsize = lov_sfs->os_bsize;
 613
 614                         osfs->os_bfree  >>= shift;
 615                         osfs->os_bavail >>= shift;
 616                         osfs->os_blocks >>= shift;
 617                 } else if (shift != 0) {
 618                         lov_sfs->os_bfree  >>= shift;
 619                         lov_sfs->os_bavail >>= shift;
 620                         lov_sfs->os_blocks >>= shift;
 621                 }
 622                 osfs->os_bfree += lov_sfs->os_bfree;
 623                 osfs->os_bavail += lov_sfs->os_bavail;
 624                 osfs->os_blocks += lov_sfs->os_blocks;
 625                 /* XXX not sure about this one - depends on policy.
 626                  *   - could be minimum if we always stripe on all OBDs
 627                  *     (but that would be wrong for any other policy,
 628                  *     if one of the OBDs has no more objects left)
 629                  *   - could be sum if we stripe whole objects
 630                  *   - could be average, just to give a nice number
 631                  *
 632                  * To give a "reasonable" (if not wholly accurate)
 633                  * number, we divide the total number of free objects
 634                  * by expected stripe count (watch out for overflow).
 635                  */
 636                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 637                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 638         }
 639 }
 640
 641 /* The callback for osc_statfs_async that finalizes a request info when a
 642  * response is received.
 643  */
 644 static int cb_statfs_update(void *cookie, int rc)
 645 {
 646         struct obd_info *oinfo = cookie;
 647         struct lov_request *lovreq;
 648         struct lov_request_set *set;
 649         struct obd_statfs *osfs, *lov_sfs;
 650         struct lov_obd *lov;
 651         struct lov_tgt_desc *tgt;
 652         struct obd_device *lovobd, *tgtobd;
 653         int success;
 654
 655         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 656         set = lovreq->rq_rqset;
 657         lovobd = set->set_obd;
 658         lov = &lovobd->u.lov;
 659         osfs = set->set_oi->oi_osfs;
 660         lov_sfs = oinfo->oi_osfs;
 661         success = atomic_read(&set->set_success);
 662         /* XXX: the same is done in lov_update_common_set, however
 663          * lovset->set_exp is not initialized.
 664          */
 665         lov_update_set(set, lovreq, rc);
 666         if (rc)
 667                 goto out;
 668
 669         obd_getref(lovobd);
 670         tgt = lov->lov_tgts[lovreq->rq_idx];
 671         if (!tgt || !tgt->ltd_active)
 672                 goto out_update;
 673
 674         tgtobd = class_exp2obd(tgt->ltd_exp);
 675         spin_lock(&tgtobd->obd_osfs_lock);
 676         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 677         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 678                 tgtobd->obd_osfs_age = cfs_time_current_64();
 679         spin_unlock(&tgtobd->obd_osfs_lock);
 680
 681 out_update:
 682         lov_update_statfs(osfs, lov_sfs, success);
 683         obd_putref(lovobd);
 684
 685 out:
 686         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 687             lov_set_finished(set, 0)) {
 688                 lov_statfs_interpret(NULL, set, set->set_count !=
 689                                      atomic_read(&set->set_success));
 690         }
 691
 692         return 0;
 693 }
 694
 695 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 696                         struct lov_request_set **reqset)
 697 {
 698         struct lov_request_set *set;
 699         struct lov_obd *lov = &obd->u.lov;
 700         int rc = 0, i;
 701
 702         set = kzalloc(sizeof(*set), GFP_NOFS);
 703         if (!set)
 704                 return -ENOMEM;
 705         lov_init_set(set);
 706
 707         set->set_obd = obd;
 708         set->set_oi = oinfo;
 709
 710         /* We only get block data from the OBD */
 711         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 712                 struct lov_request *req;
 713
 714                 if (!lov->lov_tgts[i] ||
 715                     (oinfo->oi_flags & OBD_STATFS_NODELAY &&
 716                      !lov->lov_tgts[i]->ltd_active)) {
 717                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 718                         continue;
 719                 }
 720
 721                 if (!lov->lov_tgts[i]->ltd_active)
 722                         lov_check_and_wait_active(lov, i);
 723
 724                 /* skip targets that have been explicitly disabled by the
 725                  * administrator
 726                  */
 727                 if (!lov->lov_tgts[i]->ltd_exp) {
 728                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 729                         continue;
 730                 }
 731
 732                 req = kzalloc(sizeof(*req), GFP_NOFS);
 733                 if (!req) {
 734                         rc = -ENOMEM;
 735                         goto out_set;
 736                 }
 737
 738                 req->rq_oi.oi_osfs = kzalloc(sizeof(*req->rq_oi.oi_osfs),
 739                                              GFP_NOFS);
 740                 if (!req->rq_oi.oi_osfs) {
 741                         kfree(req);
 742                         rc = -ENOMEM;
 743                         goto out_set;
 744                 }
 745
 746                 req->rq_idx = i;
 747                 req->rq_oi.oi_cb_up = cb_statfs_update;
 748                 req->rq_oi.oi_flags = oinfo->oi_flags;
 749
 750                 lov_set_add_req(req, set);
 751         }
 752         if (!set->set_count) {
 753                 rc = -EIO;
 754                 goto out_set;
 755         }
 756         *reqset = set;
 757         return rc;
 758 out_set:
 759         lov_fini_statfs_set(set);
 760         return rc;
 761 }