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