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 #include <libcfs/libcfs.h>
  40
  41 #include <obd_class.h>
  42 #include <lustre/lustre_idl.h>
  43
  44 #include "lov_internal.h"
  45
  46 static void lov_init_set(struct lov_request_set *set)
  47 {
  48         set->set_count = 0;
  49         atomic_set(&set->set_completes, 0);
  50         atomic_set(&set->set_success, 0);
  51         atomic_set(&set->set_finish_checked, 0);
  52         set->set_cookies = 0;
  53         INIT_LIST_HEAD(&set->set_list);
  54         atomic_set(&set->set_refcount, 1);
  55         init_waitqueue_head(&set->set_waitq);
  56 }
  57
  58 void lov_finish_set(struct lov_request_set *set)
  59 {
  60         struct list_head *pos, *n;
  61         struct lov_request *req;
  62         ENTRY;
  63
  64         LASSERT(set != NULL);
  65         list_for_each_safe(pos, n, &set->set_list) {
  66                 req = list_entry(pos, struct lov_request, rq_link);
  67                 list_del_init(&req->rq_link);
  68
  69                 if (req->rq_oi.oi_oa != NULL)
  70                         OBDO_FREE(req->rq_oi.oi_oa);
  71
  72                 if (req->rq_oi.oi_osfs != NULL)
  73                         OBD_FREE_PTR(req->rq_oi.oi_osfs);
  74
  75                 OBD_FREE_PTR(req);
  76         }
  77
  78         OBD_FREE_PTR(set);
  79         EXIT;
  80 }
  81
  82 int lov_set_finished(struct lov_request_set *set, int idempotent)
  83 {
  84         int completes = atomic_read(&set->set_completes);
  85
  86         CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
  87
  88         if (completes == set->set_count) {
  89                 if (idempotent)
  90                         return 1;
  91                 if (atomic_inc_return(&set->set_finish_checked) == 1)
  92                         return 1;
  93         }
  94         return 0;
  95 }
  96
  97 void lov_update_set(struct lov_request_set *set,
  98                     struct lov_request *req, int rc)
  99 {
 100         req->rq_complete = 1;
 101         req->rq_rc = rc;
 102
 103         atomic_inc(&set->set_completes);
 104         if (rc == 0)
 105                 atomic_inc(&set->set_success);
 106
 107         wake_up(&set->set_waitq);
 108 }
 109
 110 int lov_update_common_set(struct lov_request_set *set,
 111                           struct lov_request *req, int rc)
 112 {
 113         struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
 114         ENTRY;
 115
 116         lov_update_set(set, req, rc);
 117
 118         /* grace error on inactive ost */
 119         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 120                     lov->lov_tgts[req->rq_idx]->ltd_active))
 121                 rc = 0;
 122
 123         /* FIXME in raid1 regime, should return 0 */
 124         RETURN(rc);
 125 }
 126
 127 void lov_set_add_req(struct lov_request *req, struct lov_request_set *set)
 128 {
 129         list_add_tail(&req->rq_link, &set->set_list);
 130         set->set_count++;
 131         req->rq_rqset = set;
 132 }
 133
 134 static int lov_check_set(struct lov_obd *lov, int idx)
 135 {
 136         int rc = 0;
 137         mutex_lock(&lov->lov_lock);
 138
 139         if (lov->lov_tgts[idx] == NULL ||
 140             lov->lov_tgts[idx]->ltd_active ||
 141             (lov->lov_tgts[idx]->ltd_exp != NULL &&
 142              class_exp2cliimp(lov->lov_tgts[idx]->ltd_exp)->imp_connect_tried))
 143                 rc = 1;
 144
 145         mutex_unlock(&lov->lov_lock);
 146         return rc;
 147 }
 148
 149 /* Check if the OSC connection exists and is active.
 150  * If the OSC has not yet had a chance to connect to the OST the first time,
 151  * wait once for it to connect instead of returning an error.
 152  */
 153 int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 154 {
 155         wait_queue_head_t waitq;
 156         struct l_wait_info lwi;
 157         struct lov_tgt_desc *tgt;
 158         int rc = 0;
 159
 160         mutex_lock(&lov->lov_lock);
 161
 162         tgt = lov->lov_tgts[ost_idx];
 163
 164         if (unlikely(tgt == NULL))
 165                 GOTO(out, rc = 0);
 166
 167         if (likely(tgt->ltd_active))
 168                 GOTO(out, rc = 1);
 169
 170         if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried)
 171                 GOTO(out, rc = 0);
 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 list_head *pos;
 193         struct lov_request *req;
 194         struct obdo *tmp_oa;
 195         int rc = 0, attrset = 0;
 196         ENTRY;
 197
 198         LASSERT(set->set_oi != NULL);
 199
 200         if (set->set_oi->oi_oa == NULL)
 201                 RETURN(0);
 202
 203         if (!atomic_read(&set->set_success))
 204                 RETURN(-EIO);
 205
 206         OBDO_ALLOC(tmp_oa);
 207         if (tmp_oa == NULL)
 208                 GOTO(out, rc = -ENOMEM);
 209
 210         list_for_each(pos, &set->set_list) {
 211                 req = list_entry(pos, struct lov_request, rq_link);
 212
 213                 if (!req->rq_complete || req->rq_rc)
 214                         continue;
 215                 if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
 216                         continue;
 217                 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
 218                                 req->rq_oi.oi_oa->o_valid,
 219                                 set->set_oi->oi_md, req->rq_stripe, &attrset);
 220         }
 221         if (!attrset) {
 222                 CERROR("No stripes had valid attrs\n");
 223                 rc = -EIO;
 224         }
 225         if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
 226             (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
 227                 /* When we take attributes of some epoch, we require all the
 228                  * ost to be active. */
 229                 CERROR("Not all the stripes had valid attrs\n");
 230                 GOTO(out, rc = -EIO);
 231         }
 232
 233         tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
 234         memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
 235 out:
 236         if (tmp_oa)
 237                 OBDO_FREE(tmp_oa);
 238         RETURN(rc);
 239
 240 }
 241
 242 int lov_fini_getattr_set(struct lov_request_set *set)
 243 {
 244         int rc = 0;
 245         ENTRY;
 246
 247         if (set == NULL)
 248                 RETURN(0);
 249         LASSERT(set->set_exp);
 250         if (atomic_read(&set->set_completes))
 251                 rc = common_attr_done(set);
 252
 253         lov_put_reqset(set);
 254
 255         RETURN(rc);
 256 }
 257
 258 /* The callback for osc_getattr_async that finilizes a request info when a
 259  * response is received. */
 260 static int cb_getattr_update(void *cookie, int rc)
 261 {
 262         struct obd_info *oinfo = cookie;
 263         struct lov_request *lovreq;
 264         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 265         return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
 266 }
 267
 268 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 269                          struct lov_request_set **reqset)
 270 {
 271         struct lov_request_set *set;
 272         struct lov_obd *lov = &exp->exp_obd->u.lov;
 273         int rc = 0, i;
 274         ENTRY;
 275
 276         OBD_ALLOC(set, sizeof(*set));
 277         if (set == NULL)
 278                 RETURN(-ENOMEM);
 279         lov_init_set(set);
 280
 281         set->set_exp = exp;
 282         set->set_oi = oinfo;
 283
 284         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 285                 struct lov_oinfo *loi;
 286                 struct lov_request *req;
 287
 288                 loi = oinfo->oi_md->lsm_oinfo[i];
 289                 if (lov_oinfo_is_dummy(loi))
 290                         continue;
 291
 292                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 293                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 294                         if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH)
 295                                 /* SOM requires all the OSTs to be active. */
 296                                 GOTO(out_set, rc = -EIO);
 297                         continue;
 298                 }
 299
 300                 OBD_ALLOC(req, sizeof(*req));
 301                 if (req == NULL)
 302                         GOTO(out_set, rc = -ENOMEM);
 303
 304                 req->rq_stripe = i;
 305                 req->rq_idx = loi->loi_ost_idx;
 306
 307                 OBDO_ALLOC(req->rq_oi.oi_oa);
 308                 if (req->rq_oi.oi_oa == NULL) {
 309                         OBD_FREE(req, sizeof(*req));
 310                         GOTO(out_set, rc = -ENOMEM);
 311                 }
 312                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 313                        sizeof(*req->rq_oi.oi_oa));
 314                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 315                 req->rq_oi.oi_cb_up = cb_getattr_update;
 316                 req->rq_oi.oi_capa = oinfo->oi_capa;
 317
 318                 lov_set_add_req(req, set);
 319         }
 320         if (!set->set_count)
 321                 GOTO(out_set, rc = -EIO);
 322         *reqset = set;
 323         RETURN(rc);
 324 out_set:
 325         lov_fini_getattr_set(set);
 326         RETURN(rc);
 327 }
 328
 329 int lov_fini_destroy_set(struct lov_request_set *set)
 330 {
 331         ENTRY;
 332
 333         if (set == NULL)
 334                 RETURN(0);
 335         LASSERT(set->set_exp);
 336         if (atomic_read(&set->set_completes)) {
 337                 /* FIXME update qos data here */
 338         }
 339
 340         lov_put_reqset(set);
 341
 342         RETURN(0);
 343 }
 344
 345 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 346                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 347                          struct obd_trans_info *oti,
 348                          struct lov_request_set **reqset)
 349 {
 350         struct lov_request_set *set;
 351         struct lov_obd *lov = &exp->exp_obd->u.lov;
 352         int rc = 0, i;
 353         ENTRY;
 354
 355         OBD_ALLOC(set, sizeof(*set));
 356         if (set == NULL)
 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 != NULL && 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                 OBD_ALLOC(req, sizeof(*req));
 381                 if (req == NULL)
 382                         GOTO(out_set, rc = -ENOMEM);
 383
 384                 req->rq_stripe = i;
 385                 req->rq_idx = loi->loi_ost_idx;
 386
 387                 OBDO_ALLOC(req->rq_oi.oi_oa);
 388                 if (req->rq_oi.oi_oa == NULL) {
 389                         OBD_FREE(req, sizeof(*req));
 390                         GOTO(out_set, rc = -ENOMEM);
 391                 }
 392                 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
 393                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 394                 lov_set_add_req(req, set);
 395         }
 396         if (!set->set_count)
 397                 GOTO(out_set, rc = -EIO);
 398         *reqset = set;
 399         RETURN(rc);
 400 out_set:
 401         lov_fini_destroy_set(set);
 402         RETURN(rc);
 403 }
 404
 405 int lov_fini_setattr_set(struct lov_request_set *set)
 406 {
 407         int rc = 0;
 408         ENTRY;
 409
 410         if (set == NULL)
 411                 RETURN(0);
 412         LASSERT(set->set_exp);
 413         if (atomic_read(&set->set_completes)) {
 414                 rc = common_attr_done(set);
 415                 /* FIXME update qos data here */
 416         }
 417
 418         lov_put_reqset(set);
 419         RETURN(rc);
 420 }
 421
 422 int lov_update_setattr_set(struct lov_request_set *set,
 423                            struct lov_request *req, int rc)
 424 {
 425         struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
 426         struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
 427         ENTRY;
 428
 429         lov_update_set(set, req, rc);
 430
 431         /* grace error on inactive ost */
 432         if (rc && !(lov->lov_tgts[req->rq_idx] &&
 433                     lov->lov_tgts[req->rq_idx]->ltd_active))
 434                 rc = 0;
 435
 436         if (rc == 0) {
 437                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
 438                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
 439                                 req->rq_oi.oi_oa->o_ctime;
 440                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
 441                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
 442                                 req->rq_oi.oi_oa->o_mtime;
 443                 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
 444                         lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
 445                                 req->rq_oi.oi_oa->o_atime;
 446         }
 447
 448         RETURN(rc);
 449 }
 450
 451 /* The callback for osc_setattr_async that finilizes a request info when a
 452  * response is received. */
 453 static int cb_setattr_update(void *cookie, int rc)
 454 {
 455         struct obd_info *oinfo = cookie;
 456         struct lov_request *lovreq;
 457         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 458         return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
 459 }
 460
 461 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 462                          struct obd_trans_info *oti,
 463                          struct lov_request_set **reqset)
 464 {
 465         struct lov_request_set *set;
 466         struct lov_obd *lov = &exp->exp_obd->u.lov;
 467         int rc = 0, i;
 468         ENTRY;
 469
 470         OBD_ALLOC(set, sizeof(*set));
 471         if (set == NULL)
 472                 RETURN(-ENOMEM);
 473         lov_init_set(set);
 474
 475         set->set_exp = exp;
 476         set->set_oi = oinfo;
 477         if (oti != NULL && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 478                 set->set_cookies = oti->oti_logcookies;
 479
 480         for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
 481                 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
 482                 struct lov_request *req;
 483
 484                 if (lov_oinfo_is_dummy(loi))
 485                         continue;
 486
 487                 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
 488                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
 489                         continue;
 490                 }
 491
 492                 OBD_ALLOC(req, sizeof(*req));
 493                 if (req == NULL)
 494                         GOTO(out_set, rc = -ENOMEM);
 495                 req->rq_stripe = i;
 496                 req->rq_idx = loi->loi_ost_idx;
 497
 498                 OBDO_ALLOC(req->rq_oi.oi_oa);
 499                 if (req->rq_oi.oi_oa == NULL) {
 500                         OBD_FREE(req, sizeof(*req));
 501                         GOTO(out_set, rc = -ENOMEM);
 502                 }
 503                 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
 504                        sizeof(*req->rq_oi.oi_oa));
 505                 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
 506                 req->rq_oi.oi_oa->o_stripe_idx = i;
 507                 req->rq_oi.oi_cb_up = cb_setattr_update;
 508                 req->rq_oi.oi_capa = oinfo->oi_capa;
 509
 510                 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
 511                         int off = lov_stripe_offset(oinfo->oi_md,
 512                                                     oinfo->oi_oa->o_size, i,
 513                                                     &req->rq_oi.oi_oa->o_size);
 514
 515                         if (off < 0 && req->rq_oi.oi_oa->o_size)
 516                                 req->rq_oi.oi_oa->o_size--;
 517
 518                         CDEBUG(D_INODE, "stripe %d has size "LPU64"/"LPU64"\n",
 519                                i, req->rq_oi.oi_oa->o_size,
 520                                oinfo->oi_oa->o_size);
 521                 }
 522                 lov_set_add_req(req, set);
 523         }
 524         if (!set->set_count)
 525                 GOTO(out_set, rc = -EIO);
 526         *reqset = set;
 527         RETURN(rc);
 528 out_set:
 529         lov_fini_setattr_set(set);
 530         RETURN(rc);
 531 }
 532
 533 #define LOV_U64_MAX ((__u64)~0ULL)
 534 #define LOV_SUM_MAX(tot, add)                                           \
 535         do {                                                            \
 536                 if ((tot) + (add) < (tot))                              \
 537                         (tot) = LOV_U64_MAX;                            \
 538                 else                                                    \
 539                         (tot) += (add);                                 \
 540         } while(0)
 541
 542 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,int success)
 543 {
 544         ENTRY;
 545
 546         if (success) {
 547                 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
 548                                                            LOV_MAGIC, 0);
 549                 if (osfs->os_files != LOV_U64_MAX)
 550                         lov_do_div64(osfs->os_files, expected_stripes);
 551                 if (osfs->os_ffree != LOV_U64_MAX)
 552                         lov_do_div64(osfs->os_ffree, expected_stripes);
 553
 554                 spin_lock(&obd->obd_osfs_lock);
 555                 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
 556                 obd->obd_osfs_age = cfs_time_current_64();
 557                 spin_unlock(&obd->obd_osfs_lock);
 558                 RETURN(0);
 559         }
 560
 561         RETURN(-EIO);
 562 }
 563
 564 int lov_fini_statfs_set(struct lov_request_set *set)
 565 {
 566         int rc = 0;
 567         ENTRY;
 568
 569         if (set == NULL)
 570                 RETURN(0);
 571
 572         if (atomic_read(&set->set_completes)) {
 573                 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
 574                                      atomic_read(&set->set_success));
 575         }
 576         lov_put_reqset(set);
 577         RETURN(rc);
 578 }
 579
 580 void lov_update_statfs(struct obd_statfs *osfs, struct obd_statfs *lov_sfs,
 581                        int success)
 582 {
 583         int shift = 0, quit = 0;
 584         __u64 tmp;
 585
 586         if (success == 0) {
 587                 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
 588         } else {
 589                 if (osfs->os_bsize != lov_sfs->os_bsize) {
 590                         /* assume all block sizes are always powers of 2 */
 591                         /* get the bits difference */
 592                         tmp = osfs->os_bsize | lov_sfs->os_bsize;
 593                         for (shift = 0; shift <= 64; ++shift) {
 594                                 if (tmp & 1) {
 595                                         if (quit)
 596                                                 break;
 597                                         else
 598                                                 quit = 1;
 599                                         shift = 0;
 600                                 }
 601                                 tmp >>= 1;
 602                         }
 603                 }
 604
 605                 if (osfs->os_bsize < lov_sfs->os_bsize) {
 606                         osfs->os_bsize = lov_sfs->os_bsize;
 607
 608                         osfs->os_bfree  >>= shift;
 609                         osfs->os_bavail >>= shift;
 610                         osfs->os_blocks >>= shift;
 611                 } else if (shift != 0) {
 612                         lov_sfs->os_bfree  >>= shift;
 613                         lov_sfs->os_bavail >>= shift;
 614                         lov_sfs->os_blocks >>= shift;
 615                 }
 616 #ifdef MIN_DF
 617                 /* Sandia requested that df (and so, statfs) only
 618                    returned minimal available space on
 619                    a single OST, so people would be able to
 620                    write this much data guaranteed. */
 621                 if (osfs->os_bavail > lov_sfs->os_bavail) {
 622                         /* Presumably if new bavail is smaller,
 623                            new bfree is bigger as well */
 624                         osfs->os_bfree = lov_sfs->os_bfree;
 625                         osfs->os_bavail = lov_sfs->os_bavail;
 626                 }
 627 #else
 628                 osfs->os_bfree += lov_sfs->os_bfree;
 629                 osfs->os_bavail += lov_sfs->os_bavail;
 630 #endif
 631                 osfs->os_blocks += lov_sfs->os_blocks;
 632                 /* XXX not sure about this one - depends on policy.
 633                  *   - could be minimum if we always stripe on all OBDs
 634                  *     (but that would be wrong for any other policy,
 635                  *     if one of the OBDs has no more objects left)
 636                  *   - could be sum if we stripe whole objects
 637                  *   - could be average, just to give a nice number
 638                  *
 639                  * To give a "reasonable" (if not wholly accurate)
 640                  * number, we divide the total number of free objects
 641                  * by expected stripe count (watch out for overflow).
 642                  */
 643                 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
 644                 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
 645         }
 646 }
 647
 648 /* The callback for osc_statfs_async that finilizes a request info when a
 649  * response is received. */
 650 static int cb_statfs_update(void *cookie, int rc)
 651 {
 652         struct obd_info *oinfo = cookie;
 653         struct lov_request *lovreq;
 654         struct lov_request_set *set;
 655         struct obd_statfs *osfs, *lov_sfs;
 656         struct lov_obd *lov;
 657         struct lov_tgt_desc *tgt;
 658         struct obd_device *lovobd, *tgtobd;
 659         int success;
 660         ENTRY;
 661
 662         lovreq = container_of(oinfo, struct lov_request, rq_oi);
 663         set = lovreq->rq_rqset;
 664         lovobd = set->set_obd;
 665         lov = &lovobd->u.lov;
 666         osfs = set->set_oi->oi_osfs;
 667         lov_sfs = oinfo->oi_osfs;
 668         success = atomic_read(&set->set_success);
 669         /* XXX: the same is done in lov_update_common_set, however
 670            lovset->set_exp is not initialized. */
 671         lov_update_set(set, lovreq, rc);
 672         if (rc)
 673                 GOTO(out, rc);
 674
 675         obd_getref(lovobd);
 676         tgt = lov->lov_tgts[lovreq->rq_idx];
 677         if (!tgt || !tgt->ltd_active)
 678                 GOTO(out_update, rc);
 679
 680         tgtobd = class_exp2obd(tgt->ltd_exp);
 681         spin_lock(&tgtobd->obd_osfs_lock);
 682         memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
 683         if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
 684                 tgtobd->obd_osfs_age = cfs_time_current_64();
 685         spin_unlock(&tgtobd->obd_osfs_lock);
 686
 687 out_update:
 688         lov_update_statfs(osfs, lov_sfs, success);
 689         obd_putref(lovobd);
 690
 691 out:
 692         if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
 693             lov_set_finished(set, 0)) {
 694                 lov_statfs_interpret(NULL, set, set->set_count !=
 695                                      atomic_read(&set->set_success));
 696         }
 697
 698         RETURN(0);
 699 }
 700
 701 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 702                         struct lov_request_set **reqset)
 703 {
 704         struct lov_request_set *set;
 705         struct lov_obd *lov = &obd->u.lov;
 706         int rc = 0, i;
 707         ENTRY;
 708
 709         OBD_ALLOC(set, sizeof(*set));
 710         if (set == NULL)
 711                 RETURN(-ENOMEM);
 712         lov_init_set(set);
 713
 714         set->set_obd = obd;
 715         set->set_oi = oinfo;
 716
 717         /* We only get block data from the OBD */
 718         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 719                 struct lov_request *req;
 720
 721                 if (lov->lov_tgts[i] == NULL ||
 722                     (oinfo->oi_flags & OBD_STATFS_NODELAY &&
 723                      !lov->lov_tgts[i]->ltd_active)) {
 724                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 725                         continue;
 726                 }
 727
 728                 if (!lov->lov_tgts[i]->ltd_active)
 729                         lov_check_and_wait_active(lov, i);
 730
 731                 /* skip targets that have been explicitely disabled by the
 732                  * administrator */
 733                 if (!lov->lov_tgts[i]->ltd_exp) {
 734                         CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
 735                         continue;
 736                 }
 737
 738                 OBD_ALLOC(req, sizeof(*req));
 739                 if (req == NULL)
 740                         GOTO(out_set, rc = -ENOMEM);
 741
 742                 OBD_ALLOC(req->rq_oi.oi_osfs, sizeof(*req->rq_oi.oi_osfs));
 743                 if (req->rq_oi.oi_osfs == NULL) {
 744                         OBD_FREE(req, sizeof(*req));
 745                         GOTO(out_set, rc = -ENOMEM);
 746                 }
 747
 748                 req->rq_idx = i;
 749                 req->rq_oi.oi_cb_up = cb_statfs_update;
 750                 req->rq_oi.oi_flags = oinfo->oi_flags;
 751
 752                 lov_set_add_req(req, set);
 753         }
 754         if (!set->set_count)
 755                 GOTO(out_set, rc = -EIO);
 756         *reqset = set;
 757         RETURN(rc);
 758 out_set:
 759         lov_fini_statfs_set(set);
 760         RETURN(rc);
 761 }