kernel/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, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  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         spin_lock_init(&set->set_lock);
  56 }
  57
  58 void lov_finish_set(struct lov_request_set *set)
  59 {
  60         struct list_head *pos, *n;
  61
  62         LASSERT(set);
  63         list_for_each_safe(pos, n, &set->set_list) {
  64                 struct lov_request *req = list_entry(pos,
  65                                                          struct lov_request,
  66                                                          rq_link);
  67                 list_del_init(&req->rq_link);
  68
  69                 if (req->rq_oi.oi_oa)
  70                         OBDO_FREE(req->rq_oi.oi_oa);
  71                 if (req->rq_oi.oi_md)
  72                         OBD_FREE_LARGE(req->rq_oi.oi_md, req->rq_buflen);
  73                 if (req->rq_oi.oi_osfs)
  74                         OBD_FREE(req->rq_oi.oi_osfs,
  75                                  sizeof(*req->rq_oi.oi_osfs));
  76                 OBD_FREE(req, sizeof(*req));
  77         }
  78
  79         if (set->set_pga) {
  80                 int len = set->set_oabufs * sizeof(*set->set_pga);
  81                 OBD_FREE_LARGE(set->set_pga, len);
  82         }
  83         if (set->set_lockh)
  84                 lov_llh_put(set->set_lockh);
  85
  86         OBD_FREE(set, sizeof(*set));
  87 }
  88
  89 int lov_set_finished(struct lov_request_set *set, int idempotent)
  90 {
  91         int completes = atomic_read(&set->set_completes);
  92
  93         CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
  94
  95         if (completes == set->set_count) {
  96                 if (idempotent)
  97                         return 1;
  98                 if (atomic_inc_return(&set->set_finish_checked) == 1)
  99                         return 1;
 100         }
 101         return 0;
 102 }
 103
 104 void lov_update_set(struct lov_request_set *set,
 105                     struct lov_request *req, int rc)
 106 {
 107         req->rq_complete = 1;
 108         req->rq_rc = rc;
 109
 110         atomic_inc(&set->set_completes);
 111         if (rc == 0)
 112                 atomic_inc(&set->set_success);
 113
 114         wake_up(&set->set_waitq);
 115 }
 116
 117 int lov_update_common_set(struct lov_request_set *set,
 118                           struct lov_request *req, int rc)
 119 {
 120         struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
 121
 122         lov_update_set(set, req, rc);
 123
 124         /* grace error on inactive ost */
 125         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 126                     lov->lov_tgts[req->rq_idx]->ltd_active))
 127                 rc = 0;
 128
 129         /* FIXME in raid1 regime, should return 0 */
 130         return rc;
 131 }
 132
 133 void lov_set_add_req(struct lov_request *req, struct lov_request_set *set)
 134 {
 135         list_add_tail(&req->rq_link, &set->set_list);
 136         set->set_count++;
 137         req->rq_rqset = set;
 138 }
 139
 140 static int lov_check_set(struct lov_obd *lov, int idx)
 141 {
 142         int rc;
 143         struct lov_tgt_desc *tgt;
 144
 145         mutex_lock(&lov->lov_lock);
 146         tgt = lov->lov_tgts[idx];
 147         rc = !tgt || tgt->ltd_active ||
 148                 (tgt->ltd_exp &&
 149                  class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried);
 150         mutex_unlock(&lov->lov_lock);
 151
 152         return rc;
 153 }
 154
 155 /* Check if the OSC connection exists and is active.
 156  * If the OSC has not yet had a chance to connect to the OST the first time,
 157  * wait once for it to connect instead of returning an error.
 158  */
 159 int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 160 {
 161         wait_queue_head_t waitq;
 162         struct l_wait_info lwi;
 163         struct lov_tgt_desc *tgt;
 164         int rc = 0;
 165
 166         mutex_lock(&lov->lov_lock);
 167
 168         tgt = lov->lov_tgts[ost_idx];
 169
 170         if (unlikely(tgt == NULL)) {
 171                 rc = 0;
 172                 goto out;
 173         }
 174
 175         if (likely(tgt->ltd_active)) {
 176                 rc = 1;
 177                 goto out;
 178         }
 179
 180         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried) {
 181                 rc = 0;
 182                 goto out;
 183         }
 184
 185         mutex_unlock(&lov->lov_lock);
 186
 187         init_waitqueue_head(&waitq);
 188         lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
 189                                    cfs_time_seconds(1), NULL, NULL);
 190
 191         rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
 192         if (tgt != NULL && tgt->ltd_active)
 193                 return 1;
 194
 195         return 0;
 196
 197 out:
 198         mutex_unlock(&lov->lov_lock);
 199         return rc;
 200 }
 201
 202 static int common_attr_done(struct lov_request_set *set)
 203 {
 204         struct list_head *pos;
 205         struct lov_request *req;
 206         struct obdo *tmp_oa;
 207         int rc = 0, attrset = 0;
 208
 209         LASSERT(set->set_oi != NULL);
 210
 211         if (set->set_oi->oi_oa == NULL)
 212                 return 0;
 213
 214         if (!atomic_read(&set->set_success))
 215                 return -EIO;
 216
 217         OBDO_ALLOC(tmp_oa);
 218         if (tmp_oa == NULL) {
 219                 rc = -ENOMEM;
 220                 goto out;
 221         }
 222
 223         list_for_each(pos, &set->set_list) {
 224                 req = list_entry(pos, struct lov_request, rq_link);
 225
 226                 if (!req->rq_complete || req->rq_rc)
 227                         continue;
 228                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 229                         continue;
 230                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 231                                 req->rq_oi.oi_oa->o_valid,
 232                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 233         }
 234         if (!attrset) {
 235                 CERROR("No stripes had valid attrs\n");
 236                 rc = -EIO;
 237         }
 238         if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
 239             (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
 240                 /* When we take attributes of some epoch, we require all the
 241                  * ost to be active. */
 242                 CERROR("Not all the stripes had valid attrs\n");
 243                 rc = -EIO;
 244                 goto out;
 245         }
 246
 247         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 248         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 249 out:
 250         if (tmp_oa)
 251                 OBDO_FREE(tmp_oa);
 252         return rc;
 253
 254 }
 255
 256 int lov_fini_getattr_set(struct lov_request_set *set)
 257 {
 258         int rc = 0;
 259
 260         if (set == NULL)
 261                 return 0;
 262         LASSERT(set->set_exp);
 263         if (atomic_read(&set->set_completes))
 264                 rc = common_attr_done(set);
 265
 266         lov_put_reqset(set);
 267
 268         return rc;
 269 }
 270
 271 /* The callback for osc_getattr_async that finalizes a request info when a
 272  * response is received. */
 273 static int cb_getattr_update(void *cookie, int rc)
 274 {
 275         struct obd_info *oinfo = cookie;
 276         struct lov_request *lovreq;
 277
 278         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 279         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 280 }
 281
 282 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 283                          struct lov_request_set **reqset)
 284 {
 285         struct lov_request_set *set;
 286         struct lov_obd *lov = &exp->exp_obd->u.lov;
 287         int rc = 0, i;
 288
 289         OBD_ALLOC(set, sizeof(*set));
 290         if (set == NULL)
 291                 return -ENOMEM;
 292         lov_init_set(set);
 293
 294         set->set_exp = exp;
 295         set->set_oi = oinfo;
 296
 297         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 298                 struct lov_oinfo *loi;
 299                 struct lov_request *req;
 300
 301                 loi = oinfo->oi_md->lsm_oinfo[i];
 302                 if (lov_oinfo_is_dummy(loi))
 303                         continue;
 304
 305                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 306                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 307                         if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH) {
 308                                 /* SOM requires all the OSTs to be active. */
 309                                 rc = -EIO;
 310                                 goto out_set;
 311                         }
 312                         continue;
 313                 }
 314
 315                 OBD_ALLOC(req, sizeof(*req));
 316                 if (req == NULL) {
 317                         rc = -ENOMEM;
 318                         goto out_set;
 319                 }
 320
 321                 req->rq_stripe = i;
 322                 req->rq_idx = loi->loi_ost_idx;
 323
 324                 OBDO_ALLOC(req->rq_oi.oi_oa);
 325                 if (req->rq_oi.oi_oa == NULL) {
 326                         OBD_FREE(req, sizeof(*req));
 327                         rc = -ENOMEM;
 328                         goto out_set;
 329                 }
 330                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 331                        sizeof(*req->rq_oi.oi_oa));
 332                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 333                 req->rq_oi.oi_cb_up = cb_getattr_update;
 334                 req->rq_oi.oi_capa = oinfo->oi_capa;
 335
 336                 lov_set_add_req(req, set);
 337         }
 338         if (!set->set_count) {
 339                 rc = -EIO;
 340                 goto out_set;
 341         }
 342         *reqset = set;
 343         return rc;
 344 out_set:
 345         lov_fini_getattr_set(set);
 346         return rc;
 347 }
 348
 349 int lov_fini_destroy_set(struct lov_request_set *set)
 350 {
 351         if (set == NULL)
 352                 return 0;
 353         LASSERT(set->set_exp);
 354         if (atomic_read(&set->set_completes)) {
 355                 /* FIXME update qos data here */
 356         }
 357
 358         lov_put_reqset(set);
 359
 360         return 0;
 361 }
 362
 363 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 364                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 365                          struct obd_trans_info *oti,
 366                          struct lov_request_set **reqset)
 367 {
 368         struct lov_request_set *set;
 369         struct lov_obd *lov = &exp->exp_obd->u.lov;
 370         int rc = 0, i;
 371
 372         OBD_ALLOC(set, sizeof(*set));
 373         if (set == NULL)
 374                 return -ENOMEM;
 375         lov_init_set(set);
 376
 377         set->set_exp = exp;
 378         set->set_oi = oinfo;
 379         set->set_oi->oi_md = lsm;
 380         set->set_oi->oi_oa = src_oa;
 381         set->set_oti = oti;
 382         if (oti != NULL && src_oa->o_valid & OBD_MD_FLCOOKIE)
 383                 set->set_cookies = oti->oti_logcookies;
 384
 385         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 386                 struct lov_oinfo *loi;
 387                 struct lov_request *req;
 388
 389                 loi = lsm->lsm_oinfo[i];
 390                 if (lov_oinfo_is_dummy(loi))
 391                         continue;
 392
 393                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 394                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 395                         continue;
 396                 }
 397
 398                 OBD_ALLOC(req, sizeof(*req));
 399                 if (req == NULL) {
 400                         rc = -ENOMEM;
 401                         goto out_set;
 402                 }
 403
 404                 req->rq_stripe = i;
 405                 req->rq_idx = loi->loi_ost_idx;
 406
 407                 OBDO_ALLOC(req->rq_oi.oi_oa);
 408                 if (req->rq_oi.oi_oa == NULL) {
 409                         OBD_FREE(req, sizeof(*req));
 410                         rc = -ENOMEM;
 411                         goto out_set;
 412                 }
 413                 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
 414                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 415                 lov_set_add_req(req, set);
 416         }
 417         if (!set->set_count) {
 418                 rc = -EIO;
 419                 goto out_set;
 420         }
 421         *reqset = set;
 422         return rc;
 423 out_set:
 424         lov_fini_destroy_set(set);
 425         return rc;
 426 }
 427
 428 int lov_fini_setattr_set(struct lov_request_set *set)
 429 {
 430         int rc = 0;
 431
 432         if (set == NULL)
 433                 return 0;
 434         LASSERT(set->set_exp);
 435         if (atomic_read(&set->set_completes)) {
 436                 rc = common_attr_done(set);
 437                 /* FIXME update qos data here */
 438         }
 439
 440         lov_put_reqset(set);
 441         return rc;
 442 }
 443
 444 int lov_update_setattr_set(struct lov_request_set *set,
 445                            struct lov_request *req, int rc)
 446 {
 447         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 448         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 449
 450         lov_update_set(set, req, rc);
 451
 452         /* grace error on inactive ost */
 453         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 454                     lov->lov_tgts[req->rq_idx]->ltd_active))
 455                 rc = 0;
 456
 457         if (rc == 0) {
 458                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 459                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 460                                 req->rq_oi.oi_oa->o_ctime;
 461                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 462                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 463                                 req->rq_oi.oi_oa->o_mtime;
 464                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 465                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 466                                 req->rq_oi.oi_oa->o_atime;
 467         }
 468
 469         return rc;
 470 }
 471
 472 /* The callback for osc_setattr_async that finalizes a request info when a
 473  * response is received. */
 474 static int cb_setattr_update(void *cookie, int rc)
 475 {
 476         struct obd_info *oinfo = cookie;
 477         struct lov_request *lovreq;
 478
 479         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 480         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 481 }
 482
 483 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 484                          struct obd_trans_info *oti,
 485                          struct lov_request_set **reqset)
 486 {
 487         struct lov_request_set *set;
 488         struct lov_obd *lov = &exp->exp_obd->u.lov;
 489         int rc = 0, i;
 490
 491         OBD_ALLOC(set, sizeof(*set));
 492         if (set == NULL)
 493                 return -ENOMEM;
 494         lov_init_set(set);
 495
 496         set->set_exp = exp;
 497         set->set_oti = oti;
 498         set->set_oi = oinfo;
 499         if (oti != NULL && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 500                 set->set_cookies = oti->oti_logcookies;
 501
 502         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 503                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 504                 struct lov_request *req;
 505
 506                 if (lov_oinfo_is_dummy(loi))
 507                         continue;
 508
 509                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 510                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 511                         continue;
 512                 }
 513
 514                 OBD_ALLOC(req, sizeof(*req));
 515                 if (req == NULL) {
 516                         rc = -ENOMEM;
 517                         goto out_set;
 518                 }
 519                 req->rq_stripe = i;
 520                 req->rq_idx = loi->loi_ost_idx;
 521
 522                 OBDO_ALLOC(req->rq_oi.oi_oa);
 523                 if (req->rq_oi.oi_oa == NULL) {
 524                         OBD_FREE(req, sizeof(*req));
 525                         rc = -ENOMEM;
 526                         goto out_set;
 527                 }
 528                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 529                        sizeof(*req->rq_oi.oi_oa));
 530                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 531                 req->rq_oi.oi_oa->o_stripe_idx = i;
 532                 req->rq_oi.oi_cb_up = cb_setattr_update;
 533                 req->rq_oi.oi_capa = oinfo->oi_capa;
 534
 535                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 536                         int off = lov_stripe_offset(oinfo->oi_md,
 537                                                     oinfo->oi_oa->o_size, i,
 538                                                     &req->rq_oi.oi_oa->o_size);
 539
 540                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 541                                 req->rq_oi.oi_oa->o_size--;
 542
 543                         CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
 544                                i, req->rq_oi.oi_oa->o_size,
 545                                oinfo->oi_oa->o_size);
 546                 }
 547                 lov_set_add_req(req, set);
 548         }
 549         if (!set->set_count) {
 550                 rc = -EIO;
 551                 goto out_set;
 552         }
 553         *reqset = set;
 554         return rc;
 555 out_set:
 556         lov_fini_setattr_set(set);
 557         return rc;
 558 }
 559
 560 #define LOV_U64_MAX ((__u64)~0ULL)
 561 #define LOV_SUM_MAX(tot, add)                                      \
 562         do {                                                        \
 563                 if ((tot) + (add) < (tot))                            \
 564                         (tot) = LOV_U64_MAX;                        \
 565                 else                                                \
 566                         (tot) += (add);                          \
 567         } while (0)
 568
 569 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 570                     int success)
 571 {
 572         if (success) {
 573                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 574                                                            LOV_MAGIC, 0);
 575                 if (osfs->os_files != LOV_U64_MAX)
 576                         lov_do_div64(osfs->os_files, expected_stripes);
 577                 if (osfs->os_ffree != LOV_U64_MAX)
 578                         lov_do_div64(osfs->os_ffree, expected_stripes);
 579
 580                 spin_lock(&obd->obd_osfs_lock);
 581                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 582                 obd->obd_osfs_age = cfs_time_current_64();
 583                 spin_unlock(&obd->obd_osfs_lock);
 584                 return 0;
 585         }
 586
 587         return -EIO;
 588 }
 589
 590 int lov_fini_statfs_set(struct lov_request_set *set)
 591 {
 592         int rc = 0;
 593
 594         if (set == NULL)
 595                 return 0;
 596
 597         if (atomic_read(&set->set_completes)) {
 598                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 599                                      atomic_read(&set->set_success));
 600         }
 601         lov_put_reqset(set);
 602         return rc;
 603 }
 604
 605 void lov_update_statfs(struct obd_statfs *osfs, struct obd_statfs *lov_sfs,
 606                        int success)
 607 {
 608         int shift = 0, quit = 0;
 609         __u64 tmp;
 610
 611         if (success == 0) {
 612                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 613         } else {
 614                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 615                         /* assume all block sizes are always powers of 2 */
 616                         /* get the bits difference */
 617                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 618                         for (shift = 0; shift <= 64; ++shift) {
 619                                 if (tmp & 1) {
 620                                         if (quit)
 621                                                 break;
 622                                         else
 623                                                 quit = 1;
 624                                         shift = 0;
 625                                 }
 626                                 tmp >>= 1;
 627                         }
 628                 }
 629
 630                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 631                         osfs->os_bsize = lov_sfs->os_bsize;
 632
 633                         osfs->os_bfree  >>= shift;
 634                         osfs->os_bavail >>= shift;
 635                         osfs->os_blocks >>= shift;
 636                 } else if (shift != 0) {
 637                         lov_sfs->os_bfree  >>= shift;
 638                         lov_sfs->os_bavail >>= shift;
 639                         lov_sfs->os_blocks >>= shift;
 640                 }
 641                 osfs->os_bfree += lov_sfs->os_bfree;
 642                 osfs->os_bavail += lov_sfs->os_bavail;
 643                 osfs->os_blocks += lov_sfs->os_blocks;
 644                 /* XXX not sure about this one - depends on policy.
 645                  *   - could be minimum if we always stripe on all OBDs
 646                  *     (but that would be wrong for any other policy,
 647                  *     if one of the OBDs has no more objects left)
 648                  *   - could be sum if we stripe whole objects
 649                  *   - could be average, just to give a nice number
 650                  *
 651                  * To give a "reasonable" (if not wholly accurate)
 652                  * number, we divide the total number of free objects
 653                  * by expected stripe count (watch out for overflow).
 654                  */
 655                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 656                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 657         }
 658 }
 659
 660 /* The callback for osc_statfs_async that finalizes a request info when a
 661  * response is received. */
 662 static int cb_statfs_update(void *cookie, int rc)
 663 {
 664         struct obd_info *oinfo = cookie;
 665         struct lov_request *lovreq;
 666         struct lov_request_set *set;
 667         struct obd_statfs *osfs, *lov_sfs;
 668         struct lov_obd *lov;
 669         struct lov_tgt_desc *tgt;
 670         struct obd_device *lovobd, *tgtobd;
 671         int success;
 672
 673         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 674         set = lovreq->rq_rqset;
 675         lovobd = set->set_obd;
 676         lov = &lovobd->u.lov;
 677         osfs = set->set_oi->oi_osfs;
 678         lov_sfs = oinfo->oi_osfs;
 679         success = atomic_read(&set->set_success);
 680         /* XXX: the same is done in lov_update_common_set, however
 681            lovset->set_exp is not initialized. */
 682         lov_update_set(set, lovreq, rc);
 683         if (rc)
 684                 goto out;
 685
 686         obd_getref(lovobd);
 687         tgt = lov->lov_tgts[lovreq->rq_idx];
 688         if (!tgt || !tgt->ltd_active)
 689                 goto out_update;
 690
 691         tgtobd = class_exp2obd(tgt->ltd_exp);
 692         spin_lock(&tgtobd->obd_osfs_lock);
 693         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 694         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 695                 tgtobd->obd_osfs_age = cfs_time_current_64();
 696         spin_unlock(&tgtobd->obd_osfs_lock);
 697
 698 out_update:
 699         lov_update_statfs(osfs, lov_sfs, success);
 700         obd_putref(lovobd);
 701
 702 out:
 703         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 704             lov_set_finished(set, 0)) {
 705                 lov_statfs_interpret(NULL, set, set->set_count !=
 706                                      atomic_read(&set->set_success));
 707         }
 708
 709         return 0;
 710 }
 711
 712 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 713                         struct lov_request_set **reqset)
 714 {
 715         struct lov_request_set *set;
 716         struct lov_obd *lov = &obd->u.lov;
 717         int rc = 0, i;
 718
 719         OBD_ALLOC(set, sizeof(*set));
 720         if (set == NULL)
 721                 return -ENOMEM;
 722         lov_init_set(set);
 723
 724         set->set_obd = obd;
 725         set->set_oi = oinfo;
 726
 727         /* We only get block data from the OBD */
 728         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 729                 struct lov_request *req;
 730
 731                 if (lov->lov_tgts[i] == NULL ||
 732                     (!lov_check_and_wait_active(lov, i) &&
 733                      (oinfo->oi_flags & OBD_STATFS_NODELAY))) {
 734                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 735                         continue;
 736                 }
 737
 738                 /* skip targets that have been explicitly disabled by the
 739                  * administrator */
 740                 if (!lov->lov_tgts[i]->ltd_exp) {
 741                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 742                         continue;
 743                 }
 744
 745                 OBD_ALLOC(req, sizeof(*req));
 746                 if (req == NULL) {
 747                         rc = -ENOMEM;
 748                         goto out_set;
 749                 }
 750
 751                 OBD_ALLOC(req->rq_oi.oi_osfs, sizeof(*req->rq_oi.oi_osfs));
 752                 if (req->rq_oi.oi_osfs == NULL) {
 753                         OBD_FREE(req, sizeof(*req));
 754                         rc = -ENOMEM;
 755                         goto out_set;
 756                 }
 757
 758                 req->rq_idx = i;
 759                 req->rq_oi.oi_cb_up = cb_statfs_update;
 760                 req->rq_oi.oi_flags = oinfo->oi_flags;
 761
 762                 lov_set_add_req(req, set);
 763         }
 764         if (!set->set_count) {
 765                 rc = -EIO;
 766                 goto out_set;
 767         }
 768         *reqset = set;
 769         return rc;
 770 out_set:
 771         lov_fini_statfs_set(set);
 772         return rc;
 773 }