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, 2013, 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 #ifdef __KERNEL__
  40 #include <libcfs/libcfs.h>
  41 #else
  42 #include <liblustre.h>
  43 #endif
  44
  45 #include <obd_class.h>
  46 #include <lustre/lustre_idl.h>
  47
  48 #include "lov_internal.h"
  49
  50 static void lov_init_set(struct lov_request_set *set)
  51 {
  52         set->set_count = 0;
  53         atomic_set(&set->set_completes, 0);
  54         atomic_set(&set->set_success, 0);
  55         atomic_set(&set->set_finish_checked, 0);
  56         set->set_cookies = 0;
  57         INIT_LIST_HEAD(&set->set_list);
  58         atomic_set(&set->set_refcount, 1);
  59         init_waitqueue_head(&set->set_waitq);
  60 }
  61
  62 void lov_finish_set(struct lov_request_set *set)
  63 {
  64         struct list_head *pos, *n;
  65         struct lov_request *req;
  66         ENTRY;
  67
  68         LASSERT(set != NULL);
  69         list_for_each_safe(pos, n, &set->set_list) {
  70                 req = list_entry(pos, struct lov_request, rq_link);
  71                 list_del_init(&req->rq_link);
  72
  73                 if (req->rq_oi.oi_oa != NULL)
  74                         OBDO_FREE(req->rq_oi.oi_oa);
  75
  76                 if (req->rq_oi.oi_osfs != NULL)
  77                         OBD_FREE_PTR(req->rq_oi.oi_osfs);
  78
  79                 OBD_FREE_PTR(req);
  80         }
  81
  82         OBD_FREE_PTR(set);
  83         EXIT;
  84 }
  85
  86 int lov_set_finished(struct lov_request_set *set, int idempotent)
  87 {
  88         int completes = atomic_read(&set->set_completes);
  89
  90         CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
  91
  92         if (completes == set->set_count) {
  93                 if (idempotent)
  94                         return 1;
  95                 if (atomic_inc_return(&set->set_finish_checked) == 1)
  96                         return 1;
  97         }
  98         return 0;
  99 }
 100
 101 void lov_update_set(struct lov_request_set *set,
 102                     struct lov_request *req, int rc)
 103 {
 104         req->rq_complete = 1;
 105         req->rq_rc = rc;
 106
 107         atomic_inc(&set->set_completes);
 108         if (rc == 0)
 109                 atomic_inc(&set->set_success);
 110
 111         wake_up(&set->set_waitq);
 112 }
 113
 114 int lov_update_common_set(struct lov_request_set *set,
 115                           struct lov_request *req, int rc)
 116 {
 117         struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
 118         ENTRY;
 119
 120         lov_update_set(set, req, rc);
 121
 122         /* grace error on inactive ost */
 123         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 124                     lov->lov_tgts[req->rq_idx]->ltd_active))
 125                 rc = 0;
 126
 127         /* FIXME in raid1 regime, should return 0 */
 128         RETURN(rc);
 129 }
 130
 131 void lov_set_add_req(struct lov_request *req, struct lov_request_set *set)
 132 {
 133         list_add_tail(&req->rq_link, &set->set_list);
 134         set->set_count++;
 135         req->rq_rqset = set;
 136 }
 137
 138 static int lov_check_set(struct lov_obd *lov, int idx)
 139 {
 140         int rc = 0;
 141         mutex_lock(&lov->lov_lock);
 142
 143         if (lov->lov_tgts[idx] == NULL ||
 144             lov->lov_tgts[idx]->ltd_active ||
 145             (lov->lov_tgts[idx]->ltd_exp != NULL &&
 146              class_exp2cliimp(lov->lov_tgts[idx]->ltd_exp)->imp_connect_tried))
 147                 rc = 1;
 148
 149         mutex_unlock(&lov->lov_lock);
 150         return rc;
 151 }
 152
 153 /* Check if the OSC connection exists and is active.
 154  * If the OSC has not yet had a chance to connect to the OST the first time,
 155  * wait once for it to connect instead of returning an error.
 156  */
 157 int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 158 {
 159         wait_queue_head_t waitq;
 160         struct l_wait_info lwi;
 161         struct lov_tgt_desc *tgt;
 162         int rc = 0;
 163
 164         mutex_lock(&lov->lov_lock);
 165
 166         tgt = lov->lov_tgts[ost_idx];
 167
 168         if (unlikely(tgt == NULL))
 169                 GOTO(out, rc = 0);
 170
 171         if (likely(tgt->ltd_active))
 172                 GOTO(out, rc = 1);
 173
 174         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried)
 175                 GOTO(out, rc = 0);
 176
 177         mutex_unlock(&lov->lov_lock);
 178
 179         init_waitqueue_head(&waitq);
 180         lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
 181                                    cfs_time_seconds(1), NULL, NULL);
 182
 183         rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
 184         if (tgt->ltd_active)
 185                 return 1;
 186
 187         return 0;
 188
 189 out:
 190         mutex_unlock(&lov->lov_lock);
 191         return rc;
 192 }
 193
 194 static int common_attr_done(struct lov_request_set *set)
 195 {
 196         struct list_head *pos;
 197         struct lov_request *req;
 198         struct obdo *tmp_oa;
 199         int rc = 0, attrset = 0;
 200         ENTRY;
 201
 202         LASSERT(set->set_oi != NULL);
 203
 204         if (set->set_oi->oi_oa == NULL)
 205                 RETURN(0);
 206
 207         if (!atomic_read(&set->set_success))
 208                 RETURN(-EIO);
 209
 210         OBDO_ALLOC(tmp_oa);
 211         if (tmp_oa == NULL)
 212                 GOTO(out, rc = -ENOMEM);
 213
 214         list_for_each(pos, &set->set_list) {
 215                 req = list_entry(pos, struct lov_request, rq_link);
 216
 217                 if (!req->rq_complete || req->rq_rc)
 218                         continue;
 219                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 220                         continue;
 221                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 222                                 req->rq_oi.oi_oa->o_valid,
 223                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 224         }
 225         if (!attrset) {
 226                 CERROR("No stripes had valid attrs\n");
 227                 rc = -EIO;
 228         }
 229         if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
 230             (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
 231                 /* When we take attributes of some epoch, we require all the
 232                  * ost to be active. */
 233                 CERROR("Not all the stripes had valid attrs\n");
 234                 GOTO(out, rc = -EIO);
 235         }
 236
 237         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 238         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 239 out:
 240         if (tmp_oa)
 241                 OBDO_FREE(tmp_oa);
 242         RETURN(rc);
 243
 244 }
 245
 246 int lov_fini_getattr_set(struct lov_request_set *set)
 247 {
 248         int rc = 0;
 249         ENTRY;
 250
 251         if (set == NULL)
 252                 RETURN(0);
 253         LASSERT(set->set_exp);
 254         if (atomic_read(&set->set_completes))
 255                 rc = common_attr_done(set);
 256
 257         lov_put_reqset(set);
 258
 259         RETURN(rc);
 260 }
 261
 262 /* The callback for osc_getattr_async that finilizes a request info when a
 263  * response is received. */
 264 static int cb_getattr_update(void *cookie, int rc)
 265 {
 266         struct obd_info *oinfo = cookie;
 267         struct lov_request *lovreq;
 268         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 269         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 270 }
 271
 272 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 273                          struct lov_request_set **reqset)
 274 {
 275         struct lov_request_set *set;
 276         struct lov_obd *lov = &exp->exp_obd->u.lov;
 277         int rc = 0, i;
 278         ENTRY;
 279
 280         OBD_ALLOC(set, sizeof(*set));
 281         if (set == NULL)
 282                 RETURN(-ENOMEM);
 283         lov_init_set(set);
 284
 285         set->set_exp = exp;
 286         set->set_oi = oinfo;
 287
 288         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 289                 struct lov_oinfo *loi;
 290                 struct lov_request *req;
 291
 292                 loi = oinfo->oi_md->lsm_oinfo[i];
 293                 if (lov_oinfo_is_dummy(loi))
 294                         continue;
 295
 296                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 297                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 298                         if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH)
 299                                 /* SOM requires all the OSTs to be active. */
 300                                 GOTO(out_set, rc = -EIO);
 301                         continue;
 302                 }
 303
 304                 OBD_ALLOC(req, sizeof(*req));
 305                 if (req == NULL)
 306                         GOTO(out_set, rc = -ENOMEM);
 307
 308                 req->rq_stripe = i;
 309                 req->rq_idx = loi->loi_ost_idx;
 310
 311                 OBDO_ALLOC(req->rq_oi.oi_oa);
 312                 if (req->rq_oi.oi_oa == NULL) {
 313                         OBD_FREE(req, sizeof(*req));
 314                         GOTO(out_set, rc = -ENOMEM);
 315                 }
 316                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 317                        sizeof(*req->rq_oi.oi_oa));
 318                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 319                 req->rq_oi.oi_cb_up = cb_getattr_update;
 320                 req->rq_oi.oi_capa = oinfo->oi_capa;
 321
 322                 lov_set_add_req(req, set);
 323         }
 324         if (!set->set_count)
 325                 GOTO(out_set, rc = -EIO);
 326         *reqset = set;
 327         RETURN(rc);
 328 out_set:
 329         lov_fini_getattr_set(set);
 330         RETURN(rc);
 331 }
 332
 333 int lov_fini_destroy_set(struct lov_request_set *set)
 334 {
 335         ENTRY;
 336
 337         if (set == NULL)
 338                 RETURN(0);
 339         LASSERT(set->set_exp);
 340         if (atomic_read(&set->set_completes)) {
 341                 /* FIXME update qos data here */
 342         }
 343
 344         lov_put_reqset(set);
 345
 346         RETURN(0);
 347 }
 348
 349 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 350                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 351                          struct obd_trans_info *oti,
 352                          struct lov_request_set **reqset)
 353 {
 354         struct lov_request_set *set;
 355         struct lov_obd *lov = &exp->exp_obd->u.lov;
 356         int rc = 0, i;
 357         ENTRY;
 358
 359         OBD_ALLOC(set, sizeof(*set));
 360         if (set == NULL)
 361                 RETURN(-ENOMEM);
 362         lov_init_set(set);
 363
 364         set->set_exp = exp;
 365         set->set_oi = oinfo;
 366         set->set_oi->oi_md = lsm;
 367         set->set_oi->oi_oa = src_oa;
 368         if (oti != NULL && src_oa->o_valid & OBD_MD_FLCOOKIE)
 369                 set->set_cookies = oti->oti_logcookies;
 370
 371         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 372                 struct lov_oinfo *loi;
 373                 struct lov_request *req;
 374
 375                 loi = lsm->lsm_oinfo[i];
 376                 if (lov_oinfo_is_dummy(loi))
 377                         continue;
 378
 379                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 380                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 381                         continue;
 382                 }
 383
 384                 OBD_ALLOC(req, sizeof(*req));
 385                 if (req == NULL)
 386                         GOTO(out_set, rc = -ENOMEM);
 387
 388                 req->rq_stripe = i;
 389                 req->rq_idx = loi->loi_ost_idx;
 390
 391                 OBDO_ALLOC(req->rq_oi.oi_oa);
 392                 if (req->rq_oi.oi_oa == NULL) {
 393                         OBD_FREE(req, sizeof(*req));
 394                         GOTO(out_set, rc = -ENOMEM);
 395                 }
 396                 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
 397                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 398                 lov_set_add_req(req, set);
 399         }
 400         if (!set->set_count)
 401                 GOTO(out_set, rc = -EIO);
 402         *reqset = set;
 403         RETURN(rc);
 404 out_set:
 405         lov_fini_destroy_set(set);
 406         RETURN(rc);
 407 }
 408
 409 int lov_fini_setattr_set(struct lov_request_set *set)
 410 {
 411         int rc = 0;
 412         ENTRY;
 413
 414         if (set == NULL)
 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         ENTRY;
 432
 433         lov_update_set(set, req, rc);
 434
 435         /* grace error on inactive ost */
 436         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 437                     lov->lov_tgts[req->rq_idx]->ltd_active))
 438                 rc = 0;
 439
 440         if (rc == 0) {
 441                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 442                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 443                                 req->rq_oi.oi_oa->o_ctime;
 444                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 445                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 446                                 req->rq_oi.oi_oa->o_mtime;
 447                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 448                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 449                                 req->rq_oi.oi_oa->o_atime;
 450         }
 451
 452         RETURN(rc);
 453 }
 454
 455 /* The callback for osc_setattr_async that finilizes a request info when a
 456  * response is received. */
 457 static int cb_setattr_update(void *cookie, int rc)
 458 {
 459         struct obd_info *oinfo = cookie;
 460         struct lov_request *lovreq;
 461         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 462         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 463 }
 464
 465 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 466                          struct obd_trans_info *oti,
 467                          struct lov_request_set **reqset)
 468 {
 469         struct lov_request_set *set;
 470         struct lov_obd *lov = &exp->exp_obd->u.lov;
 471         int rc = 0, i;
 472         ENTRY;
 473
 474         OBD_ALLOC(set, sizeof(*set));
 475         if (set == NULL)
 476                 RETURN(-ENOMEM);
 477         lov_init_set(set);
 478
 479         set->set_exp = exp;
 480         set->set_oi = oinfo;
 481         if (oti != NULL && 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                 OBD_ALLOC(req, sizeof(*req));
 497                 if (req == NULL)
 498                         GOTO(out_set, rc = -ENOMEM);
 499                 req->rq_stripe = i;
 500                 req->rq_idx = loi->loi_ost_idx;
 501
 502                 OBDO_ALLOC(req->rq_oi.oi_oa);
 503                 if (req->rq_oi.oi_oa == NULL) {
 504                         OBD_FREE(req, sizeof(*req));
 505                         GOTO(out_set, rc = -ENOMEM);
 506                 }
 507                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 508                        sizeof(*req->rq_oi.oi_oa));
 509                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 510                 req->rq_oi.oi_oa->o_stripe_idx = i;
 511                 req->rq_oi.oi_cb_up = cb_setattr_update;
 512                 req->rq_oi.oi_capa = oinfo->oi_capa;
 513
 514                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 515                         int off = lov_stripe_offset(oinfo->oi_md,
 516                                                     oinfo->oi_oa->o_size, i,
 517                                                     &req->rq_oi.oi_oa->o_size);
 518
 519                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 520                                 req->rq_oi.oi_oa->o_size--;
 521
 522                         CDEBUG(D_INODE, "stripe %d has size "LPU64"/"LPU64"\n",
 523                                i, req->rq_oi.oi_oa->o_size,
 524                                oinfo->oi_oa->o_size);
 525                 }
 526                 lov_set_add_req(req, set);
 527         }
 528         if (!set->set_count)
 529                 GOTO(out_set, rc = -EIO);
 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,int success)
 547 {
 548         ENTRY;
 549
 550         if (success) {
 551                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 552                                                            LOV_MAGIC, 0);
 553                 if (osfs->os_files != LOV_U64_MAX)
 554                         lov_do_div64(osfs->os_files, expected_stripes);
 555                 if (osfs->os_ffree != LOV_U64_MAX)
 556                         lov_do_div64(osfs->os_ffree, expected_stripes);
 557
 558                 spin_lock(&obd->obd_osfs_lock);
 559                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 560                 obd->obd_osfs_age = cfs_time_current_64();
 561                 spin_unlock(&obd->obd_osfs_lock);
 562                 RETURN(0);
 563         }
 564
 565         RETURN(-EIO);
 566 }
 567
 568 int lov_fini_statfs_set(struct lov_request_set *set)
 569 {
 570         int rc = 0;
 571         ENTRY;
 572
 573         if (set == NULL)
 574                 RETURN(0);
 575
 576         if (atomic_read(&set->set_completes)) {
 577                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 578                                      atomic_read(&set->set_success));
 579         }
 580         lov_put_reqset(set);
 581         RETURN(rc);
 582 }
 583
 584 void lov_update_statfs(struct obd_statfs *osfs, struct obd_statfs *lov_sfs,
 585                        int success)
 586 {
 587         int shift = 0, quit = 0;
 588         __u64 tmp;
 589
 590         if (success == 0) {
 591                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 592         } else {
 593                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 594                         /* assume all block sizes are always powers of 2 */
 595                         /* get the bits difference */
 596                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 597                         for (shift = 0; shift <= 64; ++shift) {
 598                                 if (tmp & 1) {
 599                                         if (quit)
 600                                                 break;
 601                                         else
 602                                                 quit = 1;
 603                                         shift = 0;
 604                                 }
 605                                 tmp >>= 1;
 606                         }
 607                 }
 608
 609                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 610                         osfs->os_bsize = lov_sfs->os_bsize;
 611
 612                         osfs->os_bfree  >>= shift;
 613                         osfs->os_bavail >>= shift;
 614                         osfs->os_blocks >>= shift;
 615                 } else if (shift != 0) {
 616                         lov_sfs->os_bfree  >>= shift;
 617                         lov_sfs->os_bavail >>= shift;
 618                         lov_sfs->os_blocks >>= shift;
 619                 }
 620 #ifdef MIN_DF
 621                 /* Sandia requested that df (and so, statfs) only
 622                    returned minimal available space on
 623                    a single OST, so people would be able to
 624                    write this much data guaranteed. */
 625                 if (osfs->os_bavail > lov_sfs->os_bavail) {
 626                         /* Presumably if new bavail is smaller,
 627                            new bfree is bigger as well */
 628                         osfs->os_bfree = lov_sfs->os_bfree;
 629                         osfs->os_bavail = lov_sfs->os_bavail;
 630                 }
 631 #else
 632                 osfs->os_bfree += lov_sfs->os_bfree;
 633                 osfs->os_bavail += lov_sfs->os_bavail;
 634 #endif
 635                 osfs->os_blocks += lov_sfs->os_blocks;
 636                 /* XXX not sure about this one - depends on policy.
 637                  *   - could be minimum if we always stripe on all OBDs
 638                  *     (but that would be wrong for any other policy,
 639                  *     if one of the OBDs has no more objects left)
 640                  *   - could be sum if we stripe whole objects
 641                  *   - could be average, just to give a nice number
 642                  *
 643                  * To give a "reasonable" (if not wholly accurate)
 644                  * number, we divide the total number of free objects
 645                  * by expected stripe count (watch out for overflow).
 646                  */
 647                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 648                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 649         }
 650 }
 651
 652 /* The callback for osc_statfs_async that finilizes a request info when a
 653  * response is received. */
 654 static int cb_statfs_update(void *cookie, int rc)
 655 {
 656         struct obd_info *oinfo = cookie;
 657         struct lov_request *lovreq;
 658         struct lov_request_set *set;
 659         struct obd_statfs *osfs, *lov_sfs;
 660         struct lov_obd *lov;
 661         struct lov_tgt_desc *tgt;
 662         struct obd_device *lovobd, *tgtobd;
 663         int success;
 664         ENTRY;
 665
 666         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 667         set = lovreq->rq_rqset;
 668         lovobd = set->set_obd;
 669         lov = &lovobd->u.lov;
 670         osfs = set->set_oi->oi_osfs;
 671         lov_sfs = oinfo->oi_osfs;
 672         success = atomic_read(&set->set_success);
 673         /* XXX: the same is done in lov_update_common_set, however
 674            lovset->set_exp is not initialized. */
 675         lov_update_set(set, lovreq, rc);
 676         if (rc)
 677                 GOTO(out, rc);
 678
 679         obd_getref(lovobd);
 680         tgt = lov->lov_tgts[lovreq->rq_idx];
 681         if (!tgt || !tgt->ltd_active)
 682                 GOTO(out_update, rc);
 683
 684         tgtobd = class_exp2obd(tgt->ltd_exp);
 685         spin_lock(&tgtobd->obd_osfs_lock);
 686         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 687         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 688                 tgtobd->obd_osfs_age = cfs_time_current_64();
 689         spin_unlock(&tgtobd->obd_osfs_lock);
 690
 691 out_update:
 692         lov_update_statfs(osfs, lov_sfs, success);
 693         obd_putref(lovobd);
 694
 695 out:
 696         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 697             lov_set_finished(set, 0)) {
 698                 lov_statfs_interpret(NULL, set, set->set_count !=
 699                                      atomic_read(&set->set_success));
 700         }
 701
 702         RETURN(0);
 703 }
 704
 705 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 706                         struct lov_request_set **reqset)
 707 {
 708         struct lov_request_set *set;
 709         struct lov_obd *lov = &obd->u.lov;
 710         int rc = 0, i;
 711         ENTRY;
 712
 713         OBD_ALLOC(set, sizeof(*set));
 714         if (set == NULL)
 715                 RETURN(-ENOMEM);
 716         lov_init_set(set);
 717
 718         set->set_obd = obd;
 719         set->set_oi = oinfo;
 720
 721         /* We only get block data from the OBD */
 722         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 723                 struct lov_request *req;
 724
 725                 if (lov->lov_tgts[i] == NULL ||
 726                     (oinfo->oi_flags & OBD_STATFS_NODELAY &&
 727                      !lov->lov_tgts[i]->ltd_active)) {
 728                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 729                         continue;
 730                 }
 731
 732                 if (!lov->lov_tgts[i]->ltd_active)
 733                         lov_check_and_wait_active(lov, i);
 734
 735                 /* skip targets that have been explicitely disabled by the
 736                  * administrator */
 737                 if (!lov->lov_tgts[i]->ltd_exp) {
 738                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 739                         continue;
 740                 }
 741
 742                 OBD_ALLOC(req, sizeof(*req));
 743                 if (req == NULL)
 744                         GOTO(out_set, rc = -ENOMEM);
 745
 746                 OBD_ALLOC(req->rq_oi.oi_osfs, sizeof(*req->rq_oi.oi_osfs));
 747                 if (req->rq_oi.oi_osfs == NULL) {
 748                         OBD_FREE(req, sizeof(*req));
 749                         GOTO(out_set, rc = -ENOMEM);
 750                 }
 751
 752                 req->rq_idx = i;
 753                 req->rq_oi.oi_cb_up = cb_statfs_update;
 754                 req->rq_oi.oi_flags = oinfo->oi_flags;
 755
 756                 lov_set_add_req(req, set);
 757         }
 758         if (!set->set_count)
 759                 GOTO(out_set, rc = -EIO);
 760         *reqset = set;
 761         RETURN(rc);
 762 out_set:
 763         lov_fini_statfs_set(set);
 764         RETURN(rc);
 765 }