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                 GOTO(out, rc = 0);
 172
 173         if (likely(tgt->ltd_active))
 174                 GOTO(out, rc = 1);
 175
 176         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried)
 177                 GOTO(out, rc = 0);
 178
 179         mutex_unlock(&lov->lov_lock);
 180
 181         init_waitqueue_head(&waitq);
 182         lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
 183                                    cfs_time_seconds(1), NULL, NULL);
 184
 185         rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
 186         if (tgt != NULL && tgt->ltd_active)
 187                 return 1;
 188
 189         return 0;
 190
 191 out:
 192         mutex_unlock(&lov->lov_lock);
 193         return rc;
 194 }
 195
 196 static int common_attr_done(struct lov_request_set *set)
 197 {
 198         struct list_head *pos;
 199         struct lov_request *req;
 200         struct obdo *tmp_oa;
 201         int rc = 0, attrset = 0;
 202
 203         LASSERT(set->set_oi != NULL);
 204
 205         if (set->set_oi->oi_oa == NULL)
 206                 return 0;
 207
 208         if (!atomic_read(&set->set_success))
 209                 return -EIO;
 210
 211         OBDO_ALLOC(tmp_oa);
 212         if (tmp_oa == NULL)
 213                 GOTO(out, rc = -ENOMEM);
 214
 215         list_for_each(pos, &set->set_list) {
 216                 req = list_entry(pos, struct lov_request, rq_link);
 217
 218                 if (!req->rq_complete || req->rq_rc)
 219                         continue;
 220                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 221                         continue;
 222                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 223                                 req->rq_oi.oi_oa->o_valid,
 224                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 225         }
 226         if (!attrset) {
 227                 CERROR("No stripes had valid attrs\n");
 228                 rc = -EIO;
 229         }
 230         if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
 231             (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
 232                 /* When we take attributes of some epoch, we require all the
 233                  * ost to be active. */
 234                 CERROR("Not all the stripes had valid attrs\n");
 235                 GOTO(out, rc = -EIO);
 236         }
 237
 238         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 239         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 240 out:
 241         if (tmp_oa)
 242                 OBDO_FREE(tmp_oa);
 243         return rc;
 244
 245 }
 246
 247 int lov_fini_getattr_set(struct lov_request_set *set)
 248 {
 249         int rc = 0;
 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 finalizes 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
 269         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 270         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 271 }
 272
 273 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 274                          struct lov_request_set **reqset)
 275 {
 276         struct lov_request_set *set;
 277         struct lov_obd *lov = &exp->exp_obd->u.lov;
 278         int rc = 0, i;
 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_check_and_wait_active(lov, loi->loi_ost_idx)) {
 294                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 295                         if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH)
 296                                 /* SOM requires all the OSTs to be active. */
 297                                 GOTO(out_set, rc = -EIO);
 298                         continue;
 299                 }
 300
 301                 OBD_ALLOC(req, sizeof(*req));
 302                 if (req == NULL)
 303                         GOTO(out_set, rc = -ENOMEM);
 304
 305                 req->rq_stripe = i;
 306                 req->rq_idx = loi->loi_ost_idx;
 307
 308                 OBDO_ALLOC(req->rq_oi.oi_oa);
 309                 if (req->rq_oi.oi_oa == NULL) {
 310                         OBD_FREE(req, sizeof(*req));
 311                         GOTO(out_set, rc = -ENOMEM);
 312                 }
 313                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 314                        sizeof(*req->rq_oi.oi_oa));
 315                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 316                 req->rq_oi.oi_cb_up = cb_getattr_update;
 317                 req->rq_oi.oi_capa = oinfo->oi_capa;
 318
 319                 lov_set_add_req(req, set);
 320         }
 321         if (!set->set_count)
 322                 GOTO(out_set, rc = -EIO);
 323         *reqset = set;
 324         return rc;
 325 out_set:
 326         lov_fini_getattr_set(set);
 327         return rc;
 328 }
 329
 330 int lov_fini_destroy_set(struct lov_request_set *set)
 331 {
 332         if (set == NULL)
 333                 return 0;
 334         LASSERT(set->set_exp);
 335         if (atomic_read(&set->set_completes)) {
 336                 /* FIXME update qos data here */
 337         }
 338
 339         lov_put_reqset(set);
 340
 341         return 0;
 342 }
 343
 344 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 345                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 346                          struct obd_trans_info *oti,
 347                          struct lov_request_set **reqset)
 348 {
 349         struct lov_request_set *set;
 350         struct lov_obd *lov = &exp->exp_obd->u.lov;
 351         int rc = 0, i;
 352
 353         OBD_ALLOC(set, sizeof(*set));
 354         if (set == NULL)
 355                 return -ENOMEM;
 356         lov_init_set(set);
 357
 358         set->set_exp = exp;
 359         set->set_oi = oinfo;
 360         set->set_oi->oi_md = lsm;
 361         set->set_oi->oi_oa = src_oa;
 362         set->set_oti = oti;
 363         if (oti != NULL && src_oa->o_valid & OBD_MD_FLCOOKIE)
 364                 set->set_cookies = oti->oti_logcookies;
 365
 366         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 367                 struct lov_oinfo *loi;
 368                 struct lov_request *req;
 369
 370                 loi = lsm->lsm_oinfo[i];
 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                 OBD_ALLOC(req, sizeof(*req));
 377                 if (req == NULL)
 378                         GOTO(out_set, rc = -ENOMEM);
 379
 380                 req->rq_stripe = i;
 381                 req->rq_idx = loi->loi_ost_idx;
 382
 383                 OBDO_ALLOC(req->rq_oi.oi_oa);
 384                 if (req->rq_oi.oi_oa == NULL) {
 385                         OBD_FREE(req, sizeof(*req));
 386                         GOTO(out_set, rc = -ENOMEM);
 387                 }
 388                 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
 389                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 390                 lov_set_add_req(req, set);
 391         }
 392         if (!set->set_count)
 393                 GOTO(out_set, rc = -EIO);
 394         *reqset = set;
 395         return rc;
 396 out_set:
 397         lov_fini_destroy_set(set);
 398         return rc;
 399 }
 400
 401 int lov_fini_setattr_set(struct lov_request_set *set)
 402 {
 403         int rc = 0;
 404
 405         if (set == NULL)
 406                 return 0;
 407         LASSERT(set->set_exp);
 408         if (atomic_read(&set->set_completes)) {
 409                 rc = common_attr_done(set);
 410                 /* FIXME update qos data here */
 411         }
 412
 413         lov_put_reqset(set);
 414         return rc;
 415 }
 416
 417 int lov_update_setattr_set(struct lov_request_set *set,
 418                            struct lov_request *req, int rc)
 419 {
 420         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 421         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 422
 423         lov_update_set(set, req, rc);
 424
 425         /* grace error on inactive ost */
 426         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 427                     lov->lov_tgts[req->rq_idx]->ltd_active))
 428                 rc = 0;
 429
 430         if (rc == 0) {
 431                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 432                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 433                                 req->rq_oi.oi_oa->o_ctime;
 434                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 435                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 436                                 req->rq_oi.oi_oa->o_mtime;
 437                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 438                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 439                                 req->rq_oi.oi_oa->o_atime;
 440         }
 441
 442         return rc;
 443 }
 444
 445 /* The callback for osc_setattr_async that finalizes a request info when a
 446  * response is received. */
 447 static int cb_setattr_update(void *cookie, int rc)
 448 {
 449         struct obd_info *oinfo = cookie;
 450         struct lov_request *lovreq;
 451
 452         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 453         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 454 }
 455
 456 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 457                          struct obd_trans_info *oti,
 458                          struct lov_request_set **reqset)
 459 {
 460         struct lov_request_set *set;
 461         struct lov_obd *lov = &exp->exp_obd->u.lov;
 462         int rc = 0, i;
 463
 464         OBD_ALLOC(set, sizeof(*set));
 465         if (set == NULL)
 466                 return -ENOMEM;
 467         lov_init_set(set);
 468
 469         set->set_exp = exp;
 470         set->set_oti = oti;
 471         set->set_oi = oinfo;
 472         if (oti != NULL && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 473                 set->set_cookies = oti->oti_logcookies;
 474
 475         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 476                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 477                 struct lov_request *req;
 478
 479                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 480                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 481                         continue;
 482                 }
 483
 484                 OBD_ALLOC(req, sizeof(*req));
 485                 if (req == NULL)
 486                         GOTO(out_set, rc = -ENOMEM);
 487                 req->rq_stripe = i;
 488                 req->rq_idx = loi->loi_ost_idx;
 489
 490                 OBDO_ALLOC(req->rq_oi.oi_oa);
 491                 if (req->rq_oi.oi_oa == NULL) {
 492                         OBD_FREE(req, sizeof(*req));
 493                         GOTO(out_set, rc = -ENOMEM);
 494                 }
 495                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 496                        sizeof(*req->rq_oi.oi_oa));
 497                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 498                 req->rq_oi.oi_oa->o_stripe_idx = i;
 499                 req->rq_oi.oi_cb_up = cb_setattr_update;
 500                 req->rq_oi.oi_capa = oinfo->oi_capa;
 501
 502                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 503                         int off = lov_stripe_offset(oinfo->oi_md,
 504                                                     oinfo->oi_oa->o_size, i,
 505                                                     &req->rq_oi.oi_oa->o_size);
 506
 507                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 508                                 req->rq_oi.oi_oa->o_size--;
 509
 510                         CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
 511                                i, req->rq_oi.oi_oa->o_size,
 512                                oinfo->oi_oa->o_size);
 513                 }
 514                 lov_set_add_req(req, set);
 515         }
 516         if (!set->set_count)
 517                 GOTO(out_set, rc = -EIO);
 518         *reqset = set;
 519         return rc;
 520 out_set:
 521         lov_fini_setattr_set(set);
 522         return rc;
 523 }
 524
 525 #define LOV_U64_MAX ((__u64)~0ULL)
 526 #define LOV_SUM_MAX(tot, add)                                      \
 527         do {                                                        \
 528                 if ((tot) + (add) < (tot))                            \
 529                         (tot) = LOV_U64_MAX;                        \
 530                 else                                                \
 531                         (tot) += (add);                          \
 532         } while (0)
 533
 534 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 535                     int success)
 536 {
 537         if (success) {
 538                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 539                                                            LOV_MAGIC, 0);
 540                 if (osfs->os_files != LOV_U64_MAX)
 541                         lov_do_div64(osfs->os_files, expected_stripes);
 542                 if (osfs->os_ffree != LOV_U64_MAX)
 543                         lov_do_div64(osfs->os_ffree, expected_stripes);
 544
 545                 spin_lock(&obd->obd_osfs_lock);
 546                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 547                 obd->obd_osfs_age = cfs_time_current_64();
 548                 spin_unlock(&obd->obd_osfs_lock);
 549                 return 0;
 550         }
 551
 552         return -EIO;
 553 }
 554
 555 int lov_fini_statfs_set(struct lov_request_set *set)
 556 {
 557         int rc = 0;
 558
 559         if (set == NULL)
 560                 return 0;
 561
 562         if (atomic_read(&set->set_completes)) {
 563                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 564                                      atomic_read(&set->set_success));
 565         }
 566         lov_put_reqset(set);
 567         return rc;
 568 }
 569
 570 void lov_update_statfs(struct obd_statfs *osfs, struct obd_statfs *lov_sfs,
 571                        int success)
 572 {
 573         int shift = 0, quit = 0;
 574         __u64 tmp;
 575
 576         if (success == 0) {
 577                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 578         } else {
 579                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 580                         /* assume all block sizes are always powers of 2 */
 581                         /* get the bits difference */
 582                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 583                         for (shift = 0; shift <= 64; ++shift) {
 584                                 if (tmp & 1) {
 585                                         if (quit)
 586                                                 break;
 587                                         else
 588                                                 quit = 1;
 589                                         shift = 0;
 590                                 }
 591                                 tmp >>= 1;
 592                         }
 593                 }
 594
 595                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 596                         osfs->os_bsize = lov_sfs->os_bsize;
 597
 598                         osfs->os_bfree  >>= shift;
 599                         osfs->os_bavail >>= shift;
 600                         osfs->os_blocks >>= shift;
 601                 } else if (shift != 0) {
 602                         lov_sfs->os_bfree  >>= shift;
 603                         lov_sfs->os_bavail >>= shift;
 604                         lov_sfs->os_blocks >>= shift;
 605                 }
 606                 osfs->os_bfree += lov_sfs->os_bfree;
 607                 osfs->os_bavail += lov_sfs->os_bavail;
 608                 osfs->os_blocks += lov_sfs->os_blocks;
 609                 /* XXX not sure about this one - depends on policy.
 610                  *   - could be minimum if we always stripe on all OBDs
 611                  *     (but that would be wrong for any other policy,
 612                  *     if one of the OBDs has no more objects left)
 613                  *   - could be sum if we stripe whole objects
 614                  *   - could be average, just to give a nice number
 615                  *
 616                  * To give a "reasonable" (if not wholly accurate)
 617                  * number, we divide the total number of free objects
 618                  * by expected stripe count (watch out for overflow).
 619                  */
 620                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 621                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 622         }
 623 }
 624
 625 /* The callback for osc_statfs_async that finalizes a request info when a
 626  * response is received. */
 627 static int cb_statfs_update(void *cookie, int rc)
 628 {
 629         struct obd_info *oinfo = cookie;
 630         struct lov_request *lovreq;
 631         struct lov_request_set *set;
 632         struct obd_statfs *osfs, *lov_sfs;
 633         struct lov_obd *lov;
 634         struct lov_tgt_desc *tgt;
 635         struct obd_device *lovobd, *tgtobd;
 636         int success;
 637
 638         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 639         set = lovreq->rq_rqset;
 640         lovobd = set->set_obd;
 641         lov = &lovobd->u.lov;
 642         osfs = set->set_oi->oi_osfs;
 643         lov_sfs = oinfo->oi_osfs;
 644         success = atomic_read(&set->set_success);
 645         /* XXX: the same is done in lov_update_common_set, however
 646            lovset->set_exp is not initialized. */
 647         lov_update_set(set, lovreq, rc);
 648         if (rc)
 649                 GOTO(out, rc);
 650
 651         obd_getref(lovobd);
 652         tgt = lov->lov_tgts[lovreq->rq_idx];
 653         if (!tgt || !tgt->ltd_active)
 654                 GOTO(out_update, rc);
 655
 656         tgtobd = class_exp2obd(tgt->ltd_exp);
 657         spin_lock(&tgtobd->obd_osfs_lock);
 658         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 659         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 660                 tgtobd->obd_osfs_age = cfs_time_current_64();
 661         spin_unlock(&tgtobd->obd_osfs_lock);
 662
 663 out_update:
 664         lov_update_statfs(osfs, lov_sfs, success);
 665         obd_putref(lovobd);
 666
 667 out:
 668         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 669             lov_set_finished(set, 0)) {
 670                 lov_statfs_interpret(NULL, set, set->set_count !=
 671                                      atomic_read(&set->set_success));
 672         }
 673
 674         return 0;
 675 }
 676
 677 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 678                         struct lov_request_set **reqset)
 679 {
 680         struct lov_request_set *set;
 681         struct lov_obd *lov = &obd->u.lov;
 682         int rc = 0, i;
 683
 684         OBD_ALLOC(set, sizeof(*set));
 685         if (set == NULL)
 686                 return -ENOMEM;
 687         lov_init_set(set);
 688
 689         set->set_obd = obd;
 690         set->set_oi = oinfo;
 691
 692         /* We only get block data from the OBD */
 693         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 694                 struct lov_request *req;
 695
 696                 if (lov->lov_tgts[i] == NULL ||
 697                     (!lov_check_and_wait_active(lov, i) &&
 698                      (oinfo->oi_flags & OBD_STATFS_NODELAY))) {
 699                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 700                         continue;
 701                 }
 702
 703                 /* skip targets that have been explicitly disabled by the
 704                  * administrator */
 705                 if (!lov->lov_tgts[i]->ltd_exp) {
 706                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 707                         continue;
 708                 }
 709
 710                 OBD_ALLOC(req, sizeof(*req));
 711                 if (req == NULL)
 712                         GOTO(out_set, rc = -ENOMEM);
 713
 714                 OBD_ALLOC(req->rq_oi.oi_osfs, sizeof(*req->rq_oi.oi_osfs));
 715                 if (req->rq_oi.oi_osfs == NULL) {
 716                         OBD_FREE(req, sizeof(*req));
 717                         GOTO(out_set, rc = -ENOMEM);
 718                 }
 719
 720                 req->rq_idx = i;
 721                 req->rq_oi.oi_cb_up = cb_statfs_update;
 722                 req->rq_oi.oi_flags = oinfo->oi_flags;
 723
 724                 lov_set_add_req(req, set);
 725         }
 726         if (!set->set_count)
 727                 GOTO(out_set, rc = -EIO);
 728         *reqset = set;
 729         return rc;
 730 out_set:
 731         lov_fini_statfs_set(set);
 732         return rc;
 733 }