lustre/ofd/ofd_io.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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2014 Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/ofd/ofd_io.c
  33  *
  34  * This file provides functions to handle IO requests from clients and
  35  * also LFSCK routines to check parent file identifier (PFID) consistency.
  36  *
  37  * Author: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
  38  * Author: Fan Yong <fan.yong@intel.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_FILTER
  42
  43 #include "ofd_internal.h"
  44
  45 struct ofd_inconsistency_item {
  46         struct list_head         oii_list;
  47         struct ofd_object       *oii_obj;
  48         struct lu_fid            oii_pfid;
  49 };
  50
  51 /**
  52  * Verify single object for parent FID consistency.
  53  *
  54  * Part of LFSCK processing which checks single object PFID stored in extended
  55  * attribute (XATTR) against real FID of MDT parent object received by LFSCK.
  56  * This verifies that the OST object is being referenced by only a single MDT
  57  * object.
  58  *
  59  * \param[in] env       execution environment
  60  * \param[in] ofd       OFD device
  61  * \param[in] oii       object-related local data
  62  * \param[in] lr        LFSCK request data
  63  */
  64 static void ofd_inconsistency_verify_one(const struct lu_env *env,
  65                                          struct ofd_device *ofd,
  66                                          struct ofd_inconsistency_item *oii,
  67                                          struct lfsck_request *lr)
  68 {
  69         struct ofd_object       *fo     = oii->oii_obj;
  70         struct lu_fid           *pfid   = &fo->ofo_pfid;
  71         int                      rc;
  72
  73         LASSERT(fo->ofo_pfid_checking);
  74         LASSERT(!fo->ofo_pfid_verified);
  75
  76         lr->lr_fid = fo->ofo_header.loh_fid; /* OST-object itself FID. */
  77         lr->lr_fid2 = oii->oii_pfid; /* client given PFID. */
  78         lr->lr_fid3 = *pfid; /* OST local stored PFID. */
  79
  80         rc = lfsck_in_notify(env, ofd->ofd_osd, lr);
  81         ofd_write_lock(env, fo);
  82         switch (lr->lr_status) {
  83         case LPVS_INIT:
  84                 LASSERT(rc <= 0);
  85
  86                 if (rc < 0)
  87                         CDEBUG(D_LFSCK, "%s: fail to verify OST local stored "
  88                                "PFID xattr for "DFID", the client given PFID "
  89                                DFID", OST local stored PFID "DFID": rc = %d\n",
  90                                ofd_name(ofd), PFID(&fo->ofo_header.loh_fid),
  91                                PFID(&oii->oii_pfid), PFID(pfid), rc);
  92                 else
  93                         fo->ofo_pfid_verified = 1;
  94                 break;
  95         case LPVS_INCONSISTENT:
  96                 LASSERT(rc != 0);
  97
  98                 ofd->ofd_inconsistency_self_detected++;
  99                 if (rc < 0)
 100                         CDEBUG(D_LFSCK, "%s: fail to verify the client given "
 101                                "PFID for "DFID", the client given PFID "DFID
 102                                ", local stored PFID "DFID": rc = %d\n",
 103                                ofd_name(ofd), PFID(&fo->ofo_header.loh_fid),
 104                                PFID(&oii->oii_pfid), PFID(pfid), rc);
 105                 else
 106                         CDEBUG(D_LFSCK, "%s: both the client given PFID and "
 107                                "the OST local stored PFID are stale for the "
 108                                "OST-object "DFID", client given PFID is "DFID
 109                                ", local stored PFID is "DFID"\n",
 110                                ofd_name(ofd), PFID(&fo->ofo_header.loh_fid),
 111                                PFID(&oii->oii_pfid), PFID(pfid));
 112                 break;
 113         case LPVS_INCONSISTENT_TOFIX:
 114                 ofd->ofd_inconsistency_self_detected++;
 115                 if (rc == 0) {
 116                         ofd->ofd_inconsistency_self_repaired++;
 117                         CDEBUG(D_LFSCK, "%s: fixed the staled OST PFID xattr "
 118                                "for "DFID", with the client given PFID "DFID
 119                                ", the old stored PFID "DFID"\n",
 120                                ofd_name(ofd), PFID(&fo->ofo_header.loh_fid),
 121                                PFID(&oii->oii_pfid), PFID(pfid));
 122                 } else {
 123                         CDEBUG(D_LFSCK, "%s: fail to fix the OST PFID xattr "
 124                                "for "DFID", client given PFID "DFID", local "
 125                                "stored PFID "DFID": rc = %d\n",
 126                                ofd_name(ofd), PFID(&fo->ofo_header.loh_fid),
 127                                PFID(&oii->oii_pfid), PFID(pfid), rc);
 128                 }
 129                 *pfid = oii->oii_pfid;
 130                 fo->ofo_pfid_verified = 1;
 131                 break;
 132         default:
 133                 break;
 134         }
 135         fo->ofo_pfid_checking = 0;
 136         ofd_write_unlock(env, fo);
 137
 138         lu_object_put(env, &fo->ofo_obj.do_lu);
 139         OBD_FREE_PTR(oii);
 140 }
 141
 142 /**
 143  * Verification thread to check parent FID consistency.
 144  *
 145  * Kernel thread to check consistency of parent FID for any
 146  * new item added for checking by ofd_add_inconsistency_item().
 147  *
 148  * \param[in] args      OFD device
 149  *
 150  * \retval              0 on successful thread termination
 151  * \retval              negative value if thread can't start
 152  */
 153 static int ofd_inconsistency_verification_main(void *args)
 154 {
 155         struct lu_env                  env;
 156         struct ofd_device             *ofd    = args;
 157         struct ptlrpc_thread          *thread = &ofd->ofd_inconsistency_thread;
 158         struct ofd_inconsistency_item *oii;
 159         struct lfsck_request          *lr     = NULL;
 160         struct l_wait_info             lwi    = { 0 };
 161         int                            rc;
 162         ENTRY;
 163
 164         rc = lu_env_init(&env, LCT_DT_THREAD);
 165         spin_lock(&ofd->ofd_inconsistency_lock);
 166         thread_set_flags(thread, rc != 0 ? SVC_STOPPED : SVC_RUNNING);
 167         wake_up_all(&thread->t_ctl_waitq);
 168         spin_unlock(&ofd->ofd_inconsistency_lock);
 169         if (rc != 0)
 170                 RETURN(rc);
 171
 172         OBD_ALLOC_PTR(lr);
 173         if (unlikely(lr == NULL))
 174                 GOTO(out, rc = -ENOMEM);
 175
 176         lr->lr_event = LE_PAIRS_VERIFY;
 177         lr->lr_active = LFSCK_TYPE_LAYOUT;
 178
 179         spin_lock(&ofd->ofd_inconsistency_lock);
 180         while (1) {
 181                 if (unlikely(!thread_is_running(thread)))
 182                         break;
 183
 184                 while (!list_empty(&ofd->ofd_inconsistency_list)) {
 185                         oii = list_entry(ofd->ofd_inconsistency_list.next,
 186                                          struct ofd_inconsistency_item,
 187                                          oii_list);
 188                         list_del_init(&oii->oii_list);
 189                         spin_unlock(&ofd->ofd_inconsistency_lock);
 190                         ofd_inconsistency_verify_one(&env, ofd, oii, lr);
 191                         spin_lock(&ofd->ofd_inconsistency_lock);
 192                 }
 193
 194                 spin_unlock(&ofd->ofd_inconsistency_lock);
 195                 l_wait_event(thread->t_ctl_waitq,
 196                              !list_empty(&ofd->ofd_inconsistency_list) ||
 197                              !thread_is_running(thread),
 198                              &lwi);
 199                 spin_lock(&ofd->ofd_inconsistency_lock);
 200         }
 201
 202         while (!list_empty(&ofd->ofd_inconsistency_list)) {
 203                 struct ofd_object *fo;
 204
 205                 oii = list_entry(ofd->ofd_inconsistency_list.next,
 206                                  struct ofd_inconsistency_item,
 207                                  oii_list);
 208                 list_del_init(&oii->oii_list);
 209                 fo = oii->oii_obj;
 210                 spin_unlock(&ofd->ofd_inconsistency_lock);
 211
 212                 ofd_write_lock(&env, fo);
 213                 fo->ofo_pfid_checking = 0;
 214                 ofd_write_unlock(&env, fo);
 215
 216                 lu_object_put(&env, &fo->ofo_obj.do_lu);
 217                 OBD_FREE_PTR(oii);
 218                 spin_lock(&ofd->ofd_inconsistency_lock);
 219         }
 220
 221         OBD_FREE_PTR(lr);
 222
 223         GOTO(out, rc = 0);
 224
 225 out:
 226         thread_set_flags(thread, SVC_STOPPED);
 227         wake_up_all(&thread->t_ctl_waitq);
 228         spin_unlock(&ofd->ofd_inconsistency_lock);
 229         lu_env_fini(&env);
 230
 231         return rc;
 232 }
 233
 234 /**
 235  * Start parent FID verification thread.
 236  *
 237  * See ofd_inconsistency_verification_main().
 238  *
 239  * \param[in] ofd       OFD device
 240  *
 241  * \retval              0 on successful start of thread
 242  * \retval              negative value on error
 243  */
 244 int ofd_start_inconsistency_verification_thread(struct ofd_device *ofd)
 245 {
 246         struct ptlrpc_thread    *thread = &ofd->ofd_inconsistency_thread;
 247         struct l_wait_info       lwi    = { 0 };
 248         struct task_struct      *task;
 249         int                      rc;
 250
 251         spin_lock(&ofd->ofd_inconsistency_lock);
 252         if (unlikely(thread_is_running(thread))) {
 253                 spin_unlock(&ofd->ofd_inconsistency_lock);
 254
 255                 return -EALREADY;
 256         }
 257
 258         thread_set_flags(thread, 0);
 259         spin_unlock(&ofd->ofd_inconsistency_lock);
 260         task = kthread_run(ofd_inconsistency_verification_main, ofd,
 261                            "inconsistency_verification");
 262         if (IS_ERR(task)) {
 263                 rc = PTR_ERR(task);
 264                 CERROR("%s: cannot start self_repair thread: rc = %d\n",
 265                        ofd_name(ofd), rc);
 266         } else {
 267                 rc = 0;
 268                 l_wait_event(thread->t_ctl_waitq,
 269                              thread_is_running(thread) ||
 270                              thread_is_stopped(thread),
 271                              &lwi);
 272         }
 273
 274         return rc;
 275 }
 276
 277 /**
 278  * Stop parent FID verification thread.
 279  *
 280  * \param[in] ofd       OFD device
 281  *
 282  * \retval              0 on successful start of thread
 283  * \retval              -EALREADY if thread is already stopped
 284  */
 285 int ofd_stop_inconsistency_verification_thread(struct ofd_device *ofd)
 286 {
 287         struct ptlrpc_thread    *thread = &ofd->ofd_inconsistency_thread;
 288         struct l_wait_info       lwi    = { 0 };
 289
 290         spin_lock(&ofd->ofd_inconsistency_lock);
 291         if (thread_is_init(thread) || thread_is_stopped(thread)) {
 292                 spin_unlock(&ofd->ofd_inconsistency_lock);
 293
 294                 return -EALREADY;
 295         }
 296
 297         thread_set_flags(thread, SVC_STOPPING);
 298         spin_unlock(&ofd->ofd_inconsistency_lock);
 299         wake_up_all(&thread->t_ctl_waitq);
 300         l_wait_event(thread->t_ctl_waitq,
 301                      thread_is_stopped(thread),
 302                      &lwi);
 303
 304         return 0;
 305 }
 306
 307 /**
 308  * Add new item for parent FID verification.
 309  *
 310  * Prepare new verification item and pass it to the dedicated
 311  * verification thread for further processing.
 312  *
 313  * \param[in] env       execution environment
 314  * \param[in] fo        OFD object
 315  * \param[in] oa        OBDO structure with PFID
 316  */
 317 static void ofd_add_inconsistency_item(const struct lu_env *env,
 318                                        struct ofd_object *fo, struct obdo *oa)
 319 {
 320         struct ofd_device               *ofd    = ofd_obj2dev(fo);
 321         struct ofd_inconsistency_item   *oii;
 322         bool                             wakeup = false;
 323
 324         OBD_ALLOC_PTR(oii);
 325         if (oii == NULL)
 326                 return;
 327
 328         INIT_LIST_HEAD(&oii->oii_list);
 329         lu_object_get(&fo->ofo_obj.do_lu);
 330         oii->oii_obj = fo;
 331         oii->oii_pfid.f_seq = oa->o_parent_seq;
 332         oii->oii_pfid.f_oid = oa->o_parent_oid;
 333         oii->oii_pfid.f_stripe_idx = oa->o_stripe_idx;
 334
 335         spin_lock(&ofd->ofd_inconsistency_lock);
 336         if (fo->ofo_pfid_checking || fo->ofo_pfid_verified) {
 337                 spin_unlock(&ofd->ofd_inconsistency_lock);
 338                 OBD_FREE_PTR(oii);
 339
 340                 return;
 341         }
 342
 343         fo->ofo_pfid_checking = 1;
 344         if (list_empty(&ofd->ofd_inconsistency_list))
 345                 wakeup = true;
 346         list_add_tail(&oii->oii_list, &ofd->ofd_inconsistency_list);
 347         spin_unlock(&ofd->ofd_inconsistency_lock);
 348         if (wakeup)
 349                 wake_up_all(&ofd->ofd_inconsistency_thread.t_ctl_waitq);
 350
 351         /* XXX: When the found inconsistency exceeds some threshold,
 352          *      we can trigger the LFSCK to scan part of the system
 353          *      or the whole system, which depends on how to define
 354          *      the threshold, a simple way maybe like that: define
 355          *      the absolute value of how many inconsisteny allowed
 356          *      to be repaired via self detect/repair mechanism, if
 357          *      exceeded, then trigger the LFSCK to scan the layout
 358          *      inconsistency within the whole system. */
 359 }
 360
 361 /**
 362  * Verify parent FID of an object.
 363  *
 364  * Check the parent FID is sane and start extended
 365  * verification procedure otherwise.
 366  *
 367  * \param[in] env       execution environment
 368  * \param[in] fo        OFD object
 369  * \param[in] oa        OBDO structure with PFID
 370  *
 371  * \retval              0 on successful verification
 372  * \retval              -EINPROGRESS if PFID is being repaired
 373  * \retval              -EPERM if PFID was verified but still insane
 374  */
 375 int ofd_verify_ff(const struct lu_env *env, struct ofd_object *fo,
 376                   struct obdo *oa)
 377 {
 378         struct lu_fid   *pfid   = &fo->ofo_pfid;
 379         int              rc     = 0;
 380         ENTRY;
 381
 382         if (fid_is_sane(pfid)) {
 383                 if (likely(oa->o_parent_seq == pfid->f_seq &&
 384                            oa->o_parent_oid == pfid->f_oid &&
 385                            oa->o_stripe_idx == pfid->f_stripe_idx))
 386                         RETURN(0);
 387
 388                 if (fo->ofo_pfid_verified)
 389                         RETURN(-EPERM);
 390         }
 391
 392         /* The OST-object may be inconsistent, and we need further verification.
 393          * To avoid block the RPC service thread, return -EINPROGRESS to client
 394          * and make it retry later. */
 395         if (fo->ofo_pfid_checking)
 396                 RETURN(-EINPROGRESS);
 397
 398         rc = ofd_object_ff_load(env, fo);
 399         if (rc == -ENODATA)
 400                 RETURN(0);
 401
 402         if (rc < 0)
 403                 RETURN(rc);
 404
 405         if (likely(oa->o_parent_seq == pfid->f_seq &&
 406                    oa->o_parent_oid == pfid->f_oid &&
 407                    oa->o_stripe_idx == pfid->f_stripe_idx))
 408                 RETURN(0);
 409
 410         /* Push it to the dedicated thread for further verification. */
 411         ofd_add_inconsistency_item(env, fo, oa);
 412
 413         RETURN(-EINPROGRESS);
 414 }
 415
 416 /**
 417  * Prepare buffers for read request processing.
 418  *
 419  * This function converts remote buffers from client to local buffers
 420  * and prepares the latter.
 421  *
 422  * \param[in] env       execution environment
 423  * \param[in] exp       OBD export of client
 424  * \param[in] ofd       OFD device
 425  * \param[in] fid       FID of object
 426  * \param[in] la        object attributes
 427  * \param[in] oa        OBDO structure from client
 428  * \param[in] niocount  number of remote buffers
 429  * \param[in] rnb       remote buffers
 430  * \param[in] nr_local  number of local buffers
 431  * \param[in] lnb       local buffers
 432  * \param[in] jobid     job ID name
 433  *
 434  * \retval              0 on successful prepare
 435  * \retval              negative value on error
 436  */
 437 static int ofd_preprw_read(const struct lu_env *env, struct obd_export *exp,
 438                            struct ofd_device *ofd, const struct lu_fid *fid,
 439                            struct lu_attr *la, struct obdo *oa, int niocount,
 440                            struct niobuf_remote *rnb, int *nr_local,
 441                            struct niobuf_local *lnb, char *jobid)
 442 {
 443         struct ofd_object       *fo;
 444         int                      i, j, rc, tot_bytes = 0;
 445
 446         ENTRY;
 447         LASSERT(env != NULL);
 448
 449         fo = ofd_object_find(env, ofd, fid);
 450         if (IS_ERR(fo))
 451                 RETURN(PTR_ERR(fo));
 452         LASSERT(fo != NULL);
 453
 454         ofd_read_lock(env, fo);
 455         if (!ofd_object_exists(fo))
 456                 GOTO(unlock, rc = -ENOENT);
 457
 458         if (ofd->ofd_lfsck_verify_pfid && oa->o_valid & OBD_MD_FLFID) {
 459                 rc = ofd_verify_ff(env, fo, oa);
 460                 if (rc != 0)
 461                         GOTO(unlock, rc);
 462         }
 463
 464         *nr_local = 0;
 465         for (i = 0, j = 0; i < niocount; i++) {
 466                 rc = dt_bufs_get(env, ofd_object_child(fo), rnb + i,
 467                                  lnb + j, 0, ofd_object_capa(env, fo));
 468                 if (unlikely(rc < 0))
 469                         GOTO(buf_put, rc);
 470                 LASSERT(rc <= PTLRPC_MAX_BRW_PAGES);
 471                 /* correct index for local buffers to continue with */
 472                 j += rc;
 473                 *nr_local += rc;
 474                 LASSERT(j <= PTLRPC_MAX_BRW_PAGES);
 475                 tot_bytes += rnb[i].rnb_len;
 476         }
 477
 478         LASSERT(*nr_local > 0 && *nr_local <= PTLRPC_MAX_BRW_PAGES);
 479         rc = dt_attr_get(env, ofd_object_child(fo), la,
 480                          ofd_object_capa(env, fo));
 481         if (unlikely(rc))
 482                 GOTO(buf_put, rc);
 483
 484         rc = dt_read_prep(env, ofd_object_child(fo), lnb, *nr_local);
 485         if (unlikely(rc))
 486                 GOTO(buf_put, rc);
 487
 488         ofd_counter_incr(exp, LPROC_OFD_STATS_READ, jobid, tot_bytes);
 489         RETURN(0);
 490
 491 buf_put:
 492         dt_bufs_put(env, ofd_object_child(fo), lnb, *nr_local);
 493 unlock:
 494         ofd_read_unlock(env, fo);
 495         ofd_object_put(env, fo);
 496         return rc;
 497 }
 498
 499 /**
 500  * Prepare buffers for write request processing.
 501  *
 502  * This function converts remote buffers from client to local buffers
 503  * and prepares the latter. If there is recovery in progress and required
 504  * object is missing then it can be re-created before write.
 505  *
 506  * \param[in] env       execution environment
 507  * \param[in] exp       OBD export of client
 508  * \param[in] ofd       OFD device
 509  * \param[in] fid       FID of object
 510  * \param[in] la        object attributes
 511  * \param[in] oa        OBDO structure from client
 512  * \param[in] objcount  always 1
 513  * \param[in] obj       object data
 514  * \param[in] rnb       remote buffers
 515  * \param[in] nr_local  number of local buffers
 516  * \param[in] lnb       local buffers
 517  * \param[in] jobid     job ID name
 518  *
 519  * \retval              0 on successful prepare
 520  * \retval              negative value on error
 521  */
 522 static int ofd_preprw_write(const struct lu_env *env, struct obd_export *exp,
 523                             struct ofd_device *ofd, const struct lu_fid *fid,
 524                             struct lu_attr *la, struct obdo *oa,
 525                             int objcount, struct obd_ioobj *obj,
 526                             struct niobuf_remote *rnb, int *nr_local,
 527                             struct niobuf_local *lnb, char *jobid)
 528 {
 529         struct ofd_object       *fo;
 530         int                      i, j, k, rc = 0, tot_bytes = 0;
 531
 532         ENTRY;
 533         LASSERT(env != NULL);
 534         LASSERT(objcount == 1);
 535
 536         if (unlikely(exp->exp_obd->obd_recovering)) {
 537                 obd_seq seq = fid_seq(fid);
 538                 obd_id  oid = fid_oid(fid);
 539                 struct ofd_seq *oseq;
 540
 541                 oseq = ofd_seq_load(env, ofd, seq);
 542                 if (IS_ERR(oseq)) {
 543                         CERROR("%s: Can't find FID Sequence "LPX64": rc = %d\n",
 544                                ofd_name(ofd), seq, (int)PTR_ERR(oseq));
 545                         GOTO(out, rc = -EINVAL);
 546                 }
 547
 548                 if (oid > ofd_seq_last_oid(oseq)) {
 549                         int sync = 0;
 550                         int diff;
 551
 552                         mutex_lock(&oseq->os_create_lock);
 553                         diff = oid - ofd_seq_last_oid(oseq);
 554
 555                         /* Do sync create if the seq is about to used up */
 556                         if (fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq)) {
 557                                 if (unlikely(oid >= IDIF_MAX_OID - 1))
 558                                         sync = 1;
 559                         } else if (fid_seq_is_norm(seq)) {
 560                                 if (unlikely(oid >=
 561                                              LUSTRE_DATA_SEQ_MAX_WIDTH - 1))
 562                                         sync = 1;
 563                         } else {
 564                                 CERROR("%s : invalid o_seq "DOSTID"\n",
 565                                        ofd_name(ofd), POSTID(&oa->o_oi));
 566                                 mutex_unlock(&oseq->os_create_lock);
 567                                 ofd_seq_put(env, oseq);
 568                                 GOTO(out, rc = -EINVAL);
 569                         }
 570
 571                         while (diff > 0) {
 572                                 obd_id next_id = ofd_seq_last_oid(oseq) + 1;
 573                                 int count = ofd_precreate_batch(ofd, diff);
 574
 575                                 rc = ofd_precreate_objects(env, ofd, next_id,
 576                                                            oseq, count, sync);
 577                                 if (rc < 0) {
 578                                         mutex_unlock(&oseq->os_create_lock);
 579                                         ofd_seq_put(env, oseq);
 580                                         GOTO(out, rc);
 581                                 }
 582
 583                                 diff -= rc;
 584                         }
 585
 586                         mutex_unlock(&oseq->os_create_lock);
 587                 }
 588
 589                 ofd_seq_put(env, oseq);
 590         }
 591
 592         fo = ofd_object_find(env, ofd, fid);
 593         if (IS_ERR(fo))
 594                 GOTO(out, rc = PTR_ERR(fo));
 595         LASSERT(fo != NULL);
 596
 597         ofd_read_lock(env, fo);
 598         if (!ofd_object_exists(fo)) {
 599                 CERROR("%s: BRW to missing obj "DOSTID"\n",
 600                        exp->exp_obd->obd_name, POSTID(&obj->ioo_oid));
 601                 ofd_read_unlock(env, fo);
 602                 ofd_object_put(env, fo);
 603                 GOTO(out, rc = -ENOENT);
 604         }
 605
 606         if (ofd->ofd_lfsck_verify_pfid && oa->o_valid & OBD_MD_FLFID) {
 607                 rc = ofd_verify_ff(env, fo, oa);
 608                 if (rc != 0) {
 609                         ofd_read_unlock(env, fo);
 610                         ofd_object_put(env, fo);
 611                         GOTO(out, rc);
 612                 }
 613         }
 614
 615         /* Process incoming grant info, set OBD_BRW_GRANTED flag and grant some
 616          * space back if possible */
 617         ofd_grant_prepare_write(env, exp, oa, rnb, obj->ioo_bufcnt);
 618
 619         /* parse remote buffers to local buffers and prepare the latter */
 620         *nr_local = 0;
 621         for (i = 0, j = 0; i < obj->ioo_bufcnt; i++) {
 622                 rc = dt_bufs_get(env, ofd_object_child(fo),
 623                                  rnb + i, lnb + j, 1,
 624                                  ofd_object_capa(env, fo));
 625                 if (unlikely(rc < 0))
 626                         GOTO(err, rc);
 627                 LASSERT(rc <= PTLRPC_MAX_BRW_PAGES);
 628                 /* correct index for local buffers to continue with */
 629                 for (k = 0; k < rc; k++) {
 630                         lnb[j+k].lnb_flags = rnb[i].rnb_flags;
 631                         if (!(rnb[i].rnb_flags & OBD_BRW_GRANTED))
 632                                 lnb[j+k].lnb_rc = -ENOSPC;
 633
 634                         /* remote client can't break through quota */
 635                         if (exp_connect_rmtclient(exp))
 636                                 lnb[j+k].lnb_flags &= ~OBD_BRW_NOQUOTA;
 637                 }
 638                 j += rc;
 639                 *nr_local += rc;
 640                 LASSERT(j <= PTLRPC_MAX_BRW_PAGES);
 641                 tot_bytes += rnb[i].rnb_len;
 642         }
 643         LASSERT(*nr_local > 0 && *nr_local <= PTLRPC_MAX_BRW_PAGES);
 644
 645         rc = dt_write_prep(env, ofd_object_child(fo), lnb, *nr_local);
 646         if (unlikely(rc != 0))
 647                 GOTO(err, rc);
 648
 649         ofd_counter_incr(exp, LPROC_OFD_STATS_WRITE, jobid, tot_bytes);
 650         RETURN(0);
 651 err:
 652         dt_bufs_put(env, ofd_object_child(fo), lnb, *nr_local);
 653         ofd_read_unlock(env, fo);
 654         /* ofd_grant_prepare_write() was called, so we must commit */
 655         ofd_grant_commit(env, exp, rc);
 656 out:
 657         /* let's still process incoming grant information packed in the oa,
 658          * but without enforcing grant since we won't proceed with the write.
 659          * Just like a read request actually. */
 660         ofd_grant_prepare_read(env, exp, oa);
 661         return rc;
 662 }
 663
 664 /**
 665  * Prepare bulk IO requests for processing.
 666  *
 667  * This function does initial checks of IO and calls corresponding
 668  * functions for read/write processing.
 669  *
 670  * \param[in] env       execution environment
 671  * \param[in] cmd       IO type (read/write)
 672  * \param[in] exp       OBD export of client
 673  * \param[in] oa        OBDO structure from request
 674  * \param[in] objcount  always 1
 675  * \param[in] obj       object data
 676  * \param[in] rnb       remote buffers
 677  * \param[in] nr_local  number of local buffers
 678  * \param[in] lnb       local buffers
 679  * \param[in] oti       request data from OST
 680  * \param[in] capa      capability
 681  *
 682  * \retval              0 on successful prepare
 683  * \retval              negative value on error
 684  */
 685 int ofd_preprw(const struct lu_env *env, int cmd, struct obd_export *exp,
 686                struct obdo *oa, int objcount, struct obd_ioobj *obj,
 687                struct niobuf_remote *rnb, int *nr_local,
 688                struct niobuf_local *lnb, struct obd_trans_info *oti,
 689                struct lustre_capa *capa)
 690 {
 691         struct tgt_session_info *tsi = tgt_ses_info(env);
 692         struct ofd_device       *ofd = ofd_exp(exp);
 693         struct ofd_thread_info  *info;
 694         char                    *jobid;
 695         const struct lu_fid     *fid = &oa->o_oi.oi_fid;
 696         int                      rc = 0;
 697
 698         if (*nr_local > PTLRPC_MAX_BRW_PAGES) {
 699                 CERROR("%s: bulk has too many pages %d, which exceeds the"
 700                        "maximum pages per RPC of %d\n",
 701                        exp->exp_obd->obd_name, *nr_local, PTLRPC_MAX_BRW_PAGES);
 702                 RETURN(-EPROTO);
 703         }
 704
 705         if (tgt_ses_req(tsi) == NULL) { /* echo client case */
 706                 LASSERT(oti != NULL);
 707                 info = ofd_info_init(env, exp);
 708                 ofd_oti2info(info, oti);
 709                 jobid = NULL;
 710         } else {
 711                 info = tsi2ofd_info(tsi);
 712                 jobid = tsi->tsi_jobid;
 713         }
 714
 715         LASSERT(oa != NULL);
 716
 717         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOENT)) {
 718                 struct ofd_seq          *oseq;
 719
 720                 oseq = ofd_seq_load(env, ofd, ostid_seq(&oa->o_oi));
 721                 if (IS_ERR(oseq)) {
 722                         CERROR("%s: Can not find seq for "DOSTID
 723                                ": rc = %ld\n", ofd_name(ofd), POSTID(&oa->o_oi),
 724                                PTR_ERR(oseq));
 725                         RETURN(-EINVAL);
 726                 }
 727
 728                 if (oseq->os_destroys_in_progress == 0) {
 729                         /* don't fail lookups for orphan recovery, it causes
 730                          * later LBUGs when objects still exist during
 731                          * precreate */
 732                         ofd_seq_put(env, oseq);
 733                         RETURN(-ENOENT);
 734                 }
 735                 ofd_seq_put(env, oseq);
 736         }
 737
 738         LASSERT(objcount == 1);
 739         LASSERT(obj->ioo_bufcnt > 0);
 740
 741         if (cmd == OBD_BRW_WRITE) {
 742                 rc = ofd_auth_capa(exp, fid, ostid_seq(&oa->o_oi),
 743                                    capa, CAPA_OPC_OSS_WRITE);
 744                 if (rc == 0) {
 745                         la_from_obdo(&info->fti_attr, oa, OBD_MD_FLGETATTR);
 746                         rc = ofd_preprw_write(env, exp, ofd, fid,
 747                                               &info->fti_attr, oa, objcount,
 748                                               obj, rnb, nr_local, lnb, jobid);
 749                 }
 750         } else if (cmd == OBD_BRW_READ) {
 751                 rc = ofd_auth_capa(exp, fid, ostid_seq(&oa->o_oi),
 752                                    capa, CAPA_OPC_OSS_READ);
 753                 if (rc == 0) {
 754                         ofd_grant_prepare_read(env, exp, oa);
 755                         rc = ofd_preprw_read(env, exp, ofd, fid,
 756                                              &info->fti_attr, oa,
 757                                              obj->ioo_bufcnt, rnb, nr_local,
 758                                              lnb, jobid);
 759                         obdo_from_la(oa, &info->fti_attr, LA_ATIME);
 760                 }
 761         } else {
 762                 CERROR("%s: wrong cmd %d received!\n",
 763                        exp->exp_obd->obd_name, cmd);
 764                 rc = -EPROTO;
 765         }
 766         RETURN(rc);
 767 }
 768
 769 /**
 770  * Drop reference on local buffers for read bulk IO.
 771  *
 772  * This will free all local buffers use by this read request.
 773  *
 774  * \param[in] env       execution environment
 775  * \param[in] ofd       OFD device
 776  * \param[in] fid       object FID
 777  * \param[in] objcount  always 1
 778  * \param[in] niocount  number of local buffers
 779  * \param[in] lnb       local buffers
 780  *
 781  * \retval              0 on successful execution
 782  * \retval              negative value on error
 783  */
 784 static int
 785 ofd_commitrw_read(const struct lu_env *env, struct ofd_device *ofd,
 786                   const struct lu_fid *fid, int objcount, int niocount,
 787                   struct niobuf_local *lnb)
 788 {
 789         struct ofd_object *fo;
 790
 791         ENTRY;
 792
 793         LASSERT(niocount > 0);
 794
 795         fo = ofd_object_find(env, ofd, fid);
 796         if (IS_ERR(fo))
 797                 RETURN(PTR_ERR(fo));
 798         LASSERT(fo != NULL);
 799         LASSERT(ofd_object_exists(fo));
 800         dt_bufs_put(env, ofd_object_child(fo), lnb, niocount);
 801
 802         ofd_read_unlock(env, fo);
 803         ofd_object_put(env, fo);
 804         /* second put is pair to object_get in ofd_preprw_read */
 805         ofd_object_put(env, fo);
 806
 807         RETURN(0);
 808 }
 809
 810 /**
 811  * Set attributes of object during write bulk IO processing.
 812  *
 813  * Change object attributes and write parent FID into extended
 814  * attributes when needed.
 815  *
 816  * \param[in] env       execution environment
 817  * \param[in] ofd       OFD device
 818  * \param[in] ofd_obj   OFD object
 819  * \param[in] la        object attributes
 820  * \param[in] ff        parent FID
 821  *
 822  * \retval              0 on successful attributes update
 823  * \retval              negative value on error
 824  */
 825 static int
 826 ofd_write_attr_set(const struct lu_env *env, struct ofd_device *ofd,
 827                    struct ofd_object *ofd_obj, struct lu_attr *la,
 828                    struct filter_fid *ff)
 829 {
 830         struct ofd_thread_info  *info = ofd_info(env);
 831         __u64                    valid = la->la_valid;
 832         int                      rc;
 833         struct thandle          *th;
 834         struct dt_object        *dt_obj;
 835         int                      ff_needed = 0;
 836
 837         ENTRY;
 838
 839         LASSERT(la);
 840
 841         dt_obj = ofd_object_child(ofd_obj);
 842         LASSERT(dt_obj != NULL);
 843
 844         la->la_valid &= LA_UID | LA_GID;
 845
 846         rc = ofd_attr_handle_ugid(env, ofd_obj, la, 0 /* !is_setattr */);
 847         if (rc != 0)
 848                 GOTO(out, rc);
 849
 850         if (ff != NULL) {
 851                 rc = ofd_object_ff_load(env, ofd_obj);
 852                 if (rc == -ENODATA)
 853                         ff_needed = 1;
 854                 else if (rc < 0)
 855                         GOTO(out, rc);
 856         }
 857
 858         if (!la->la_valid && !ff_needed)
 859                 /* no attributes to set */
 860                 GOTO(out, rc = 0);
 861
 862         th = ofd_trans_create(env, ofd);
 863         if (IS_ERR(th))
 864                 GOTO(out, rc = PTR_ERR(th));
 865
 866         if (la->la_valid) {
 867                 rc = dt_declare_attr_set(env, dt_obj, la, th);
 868                 if (rc)
 869                         GOTO(out_tx, rc);
 870         }
 871
 872         if (ff_needed) {
 873                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_UNMATCHED_PAIR1))
 874                         ff->ff_parent.f_oid = cpu_to_le32(1UL << 31);
 875                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_UNMATCHED_PAIR2))
 876                         ff->ff_parent.f_oid =
 877                         cpu_to_le32(le32_to_cpu(ff->ff_parent.f_oid) - 1);
 878
 879                 info->fti_buf.lb_buf = ff;
 880                 info->fti_buf.lb_len = sizeof(*ff);
 881                 rc = dt_declare_xattr_set(env, dt_obj, &info->fti_buf,
 882                                           XATTR_NAME_FID, 0, th);
 883                 if (rc)
 884                         GOTO(out_tx, rc);
 885         }
 886
 887         /* We don't need a transno for this operation which will be re-executed
 888          * anyway when the OST_WRITE (with a transno assigned) is replayed */
 889         rc = dt_trans_start_local(env, ofd->ofd_osd , th);
 890         if (rc)
 891                 GOTO(out_tx, rc);
 892
 893         /* set uid/gid */
 894         if (la->la_valid) {
 895                 rc = dt_attr_set(env, dt_obj, la, th,
 896                                  ofd_object_capa(env, ofd_obj));
 897                 if (rc)
 898                         GOTO(out_tx, rc);
 899         }
 900
 901         /* set filter fid EA */
 902         if (ff_needed) {
 903                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NOPFID))
 904                         GOTO(out_tx, rc);
 905
 906                 rc = dt_xattr_set(env, dt_obj, &info->fti_buf, XATTR_NAME_FID,
 907                                   0, th, BYPASS_CAPA);
 908                 if (rc == 0) {
 909                         ofd_obj->ofo_pfid.f_seq = le64_to_cpu(ff->ff_parent.f_seq);
 910                         ofd_obj->ofo_pfid.f_oid = le32_to_cpu(ff->ff_parent.f_oid);
 911                         /* Currently, the filter_fid::ff_parent::f_ver is not
 912                          * the real parent MDT-object's FID::f_ver, instead it
 913                          * is the OST-object index in its parent MDT-object's
 914                          * layout EA. */
 915                         ofd_obj->ofo_pfid.f_stripe_idx =
 916                                         le32_to_cpu(ff->ff_parent.f_stripe_idx);
 917                 }
 918         }
 919
 920         GOTO(out_tx, rc);
 921
 922 out_tx:
 923         dt_trans_stop(env, ofd->ofd_osd, th);
 924 out:
 925         la->la_valid = valid;
 926         return rc;
 927 }
 928
 929 struct ofd_soft_sync_callback {
 930         struct dt_txn_commit_cb  ossc_cb;
 931         struct obd_export       *ossc_exp;
 932 };
 933
 934 /**
 935  * Callback function for "soft sync" update.
 936  *
 937  * Reset fed_soft_sync_count upon committing the "soft_sync" update.
 938  * See ofd_soft_sync_cb_add() below for more details on soft sync.
 939  *
 940  * \param[in] env       execution environment
 941  * \param[in] th        transaction handle
 942  * \param[in] cb        callback data
 943  * \param[in] err       error code
 944  */
 945 static void ofd_cb_soft_sync(struct lu_env *env, struct thandle *th,
 946                              struct dt_txn_commit_cb *cb, int err)
 947 {
 948         struct ofd_soft_sync_callback   *ossc;
 949
 950         ossc = container_of(cb, struct ofd_soft_sync_callback, ossc_cb);
 951
 952         CDEBUG(D_INODE, "export %p soft sync count is reset\n", ossc->ossc_exp);
 953         atomic_set(&ossc->ossc_exp->exp_filter_data.fed_soft_sync_count, 0);
 954
 955         class_export_cb_put(ossc->ossc_exp);
 956         OBD_FREE_PTR(ossc);
 957 }
 958
 959 /**
 960  * Add callback for "soft sync" processing.
 961  *
 962  * The "soft sync" mechanism does asynchronous commit when OBD_BRW_SOFT_SYNC
 963  * flag is set in client buffers. The intention is for this operation to
 964  * commit pages belonging to a client which has "too many" outstanding
 965  * unstable pages in its cache. See LU-2139 for details.
 966  *
 967  * This function adds callback to be called when commit is done.
 968  *
 969  * \param[in] th        transaction handle
 970  * \param[in] exp       OBD export of client
 971  *
 972  * \retval              0 on successful callback adding
 973  * \retval              negative value on error
 974  */
 975 static int ofd_soft_sync_cb_add(struct thandle *th, struct obd_export *exp)
 976 {
 977         struct ofd_soft_sync_callback           *ossc;
 978         struct dt_txn_commit_cb                 *dcb;
 979         int                                      rc;
 980
 981         OBD_ALLOC_PTR(ossc);
 982         if (ossc == NULL)
 983                 return -ENOMEM;
 984
 985         ossc->ossc_exp = class_export_cb_get(exp);
 986
 987         dcb = &ossc->ossc_cb;
 988         dcb->dcb_func = ofd_cb_soft_sync;
 989         INIT_LIST_HEAD(&dcb->dcb_linkage);
 990         strlcpy(dcb->dcb_name, "ofd_cb_soft_sync", sizeof(dcb->dcb_name));
 991
 992         rc = dt_trans_cb_add(th, dcb);
 993         if (rc) {
 994                 class_export_cb_put(exp);
 995                 OBD_FREE_PTR(ossc);
 996         }
 997
 998         return rc;
 999 }
1000
1001 /**
1002  * Commit bulk IO buffers to the storage.
1003  *
1004  * This function finalizes write IO processing by writing data to the disk.
1005  * That write can be synchronous or asynchronous depending on buffers flags.
1006  *
1007  * \param[in] env       execution environment
1008  * \param[in] exp       OBD export of client
1009  * \param[in] ofd       OFD device
1010  * \param[in] fid       FID of object
1011  * \param[in] la        object attributes
1012  * \param[in] ff        parent FID of object
1013  * \param[in] objcount  always 1
1014  * \param[in] niocount  number of local buffers
1015  * \param[in] lnb       local buffers
1016  * \param[in] old_rc    result of processing at this point
1017  *
1018  * \retval              0 on successful commit
1019  * \retval              negative value on error
1020  */
1021 static int
1022 ofd_commitrw_write(const struct lu_env *env, struct obd_export *exp,
1023                    struct ofd_device *ofd, const struct lu_fid *fid,
1024                    struct lu_attr *la, struct filter_fid *ff, int objcount,
1025                    int niocount, struct niobuf_local *lnb, int old_rc)
1026 {
1027         struct ofd_thread_info  *info = ofd_info(env);
1028         struct ofd_object       *fo;
1029         struct dt_object        *o;
1030         struct thandle          *th;
1031         int                      rc = 0;
1032         int                      retries = 0;
1033         int                      i;
1034         struct filter_export_data *fed = &exp->exp_filter_data;
1035         bool                     soft_sync = false;
1036         bool                     cb_registered = false;
1037
1038         ENTRY;
1039
1040         LASSERT(objcount == 1);
1041
1042         fo = ofd_object_find(env, ofd, fid);
1043         LASSERT(fo != NULL);
1044         LASSERT(ofd_object_exists(fo));
1045
1046         o = ofd_object_child(fo);
1047         LASSERT(o != NULL);
1048
1049         if (old_rc)
1050                 GOTO(out, rc = old_rc);
1051
1052         /*
1053          * The first write to each object must set some attributes.  It is
1054          * important to set the uid/gid before calling
1055          * dt_declare_write_commit() since quota enforcement is now handled in
1056          * declare phases.
1057          */
1058         rc = ofd_write_attr_set(env, ofd, fo, la, ff);
1059         if (rc)
1060                 GOTO(out, rc);
1061
1062         la->la_valid &= LA_ATIME | LA_MTIME | LA_CTIME;
1063
1064 retry:
1065         th = ofd_trans_create(env, ofd);
1066         if (IS_ERR(th))
1067                 GOTO(out, rc = PTR_ERR(th));
1068
1069         th->th_sync |= ofd->ofd_syncjournal;
1070         if (th->th_sync == 0) {
1071                 for (i = 0; i < niocount; i++) {
1072                         if (!(lnb[i].lnb_flags & OBD_BRW_ASYNC)) {
1073                                 th->th_sync = 1;
1074                                 break;
1075                         }
1076                         if (lnb[i].lnb_flags & OBD_BRW_SOFT_SYNC)
1077                                 soft_sync = true;
1078                 }
1079         }
1080
1081         if (OBD_FAIL_CHECK(OBD_FAIL_OST_DQACQ_NET))
1082                 GOTO(out_stop, rc = -EINPROGRESS);
1083
1084         rc = dt_declare_write_commit(env, o, lnb, niocount, th);
1085         if (rc)
1086                 GOTO(out_stop, rc);
1087
1088         if (la->la_valid) {
1089                 /* update [mac]time if needed */
1090                 rc = dt_declare_attr_set(env, o, la, th);
1091                 if (rc)
1092                         GOTO(out_stop, rc);
1093         }
1094
1095         rc = ofd_trans_start(env, ofd, fo, th);
1096         if (rc)
1097                 GOTO(out_stop, rc);
1098
1099         rc = dt_write_commit(env, o, lnb, niocount, th);
1100         if (rc)
1101                 GOTO(out_stop, rc);
1102
1103         if (la->la_valid) {
1104                 rc = dt_attr_set(env, o, la, th, ofd_object_capa(env, fo));
1105                 if (rc)
1106                         GOTO(out_stop, rc);
1107         }
1108
1109         /* get attr to return */
1110         rc = dt_attr_get(env, o, la, ofd_object_capa(env, fo));
1111
1112 out_stop:
1113         /* Force commit to make the just-deleted blocks
1114          * reusable. LU-456 */
1115         if (rc == -ENOSPC)
1116                 th->th_sync = 1;
1117
1118         /* do this before trans stop in case commit has finished */
1119         if (!th->th_sync && soft_sync && !cb_registered) {
1120                 ofd_soft_sync_cb_add(th, exp);
1121                 cb_registered = true;
1122         }
1123
1124         ofd_trans_stop(env, ofd, th, rc);
1125         if (rc == -ENOSPC && retries++ < 3) {
1126                 CDEBUG(D_INODE, "retry after force commit, retries:%d\n",
1127                        retries);
1128                 goto retry;
1129         }
1130
1131         if (!soft_sync)
1132                 /* reset fed_soft_sync_count upon non-SOFT_SYNC RPC */
1133                 atomic_set(&fed->fed_soft_sync_count, 0);
1134         else if (atomic_inc_return(&fed->fed_soft_sync_count) ==
1135                  ofd->ofd_soft_sync_limit)
1136                 dt_commit_async(env, ofd->ofd_osd);
1137
1138 out:
1139         dt_bufs_put(env, o, lnb, niocount);
1140         ofd_read_unlock(env, fo);
1141         ofd_object_put(env, fo);
1142         /* second put is pair to object_get in ofd_preprw_write */
1143         ofd_object_put(env, fo);
1144         ofd_grant_commit(env, info->fti_exp, old_rc);
1145         RETURN(rc);
1146 }
1147
1148 /**
1149  * Commit bulk IO to the storage.
1150  *
1151  * This is companion function to the ofd_preprw(). It finishes bulk IO
1152  * request processing by committing buffers to the storage (WRITE) and/or
1153  * freeing those buffers (read/write). See ofd_commitrw_read() and
1154  * ofd_commitrw_write() for details about each type of IO.
1155  *
1156  * \param[in] env       execution environment
1157  * \param[in] cmd       IO type (READ/WRITE)
1158  * \param[in] exp       OBD export of client
1159  * \param[in] oa        OBDO structure from client
1160  * \param[in] objcount  always 1
1161  * \param[in] obj       object data
1162  * \param[in] rnb       remote buffers
1163  * \param[in] npages    number of local buffers
1164  * \param[in] lnb       local buffers
1165  * \param[in] oti       request data from OST
1166  * \param[in] old_rc    result of processing at this point
1167  *
1168  * \retval              0 on successful commit
1169  * \retval              negative value on error
1170  */
1171 int ofd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp,
1172                  struct obdo *oa, int objcount, struct obd_ioobj *obj,
1173                  struct niobuf_remote *rnb, int npages,
1174                  struct niobuf_local *lnb, struct obd_trans_info *oti,
1175                  int old_rc)
1176 {
1177         struct ofd_thread_info  *info = ofd_info(env);
1178         struct ofd_mod_data     *fmd;
1179         __u64                    valid;
1180         struct ofd_device       *ofd = ofd_exp(exp);
1181         struct filter_fid       *ff = NULL;
1182         const struct lu_fid     *fid = &oa->o_oi.oi_fid;
1183         int                      rc = 0;
1184
1185         LASSERT(npages > 0);
1186
1187         if (cmd == OBD_BRW_WRITE) {
1188                 /* Don't update timestamps if this write is older than a
1189                  * setattr which modifies the timestamps. b=10150 */
1190
1191                 /* XXX when we start having persistent reservations this needs
1192                  * to be changed to ofd_fmd_get() to create the fmd if it
1193                  * doesn't already exist so we can store the reservation handle
1194                  * there. */
1195                 valid = OBD_MD_FLUID | OBD_MD_FLGID;
1196                 fmd = ofd_fmd_find(exp, fid);
1197                 if (!fmd || fmd->fmd_mactime_xid < info->fti_xid)
1198                         valid |= OBD_MD_FLATIME | OBD_MD_FLMTIME |
1199                                  OBD_MD_FLCTIME;
1200                 ofd_fmd_put(exp, fmd);
1201                 la_from_obdo(&info->fti_attr, oa, valid);
1202
1203                 if (oa->o_valid & OBD_MD_FLFID) {
1204                         ff = &info->fti_mds_fid;
1205                         ofd_prepare_fidea(ff, oa);
1206                 }
1207
1208                 rc = ofd_commitrw_write(env, exp, ofd, fid, &info->fti_attr,
1209                                         ff, objcount, npages, lnb, old_rc);
1210                 if (rc == 0)
1211                         obdo_from_la(oa, &info->fti_attr,
1212                                      OFD_VALID_FLAGS | LA_GID | LA_UID);
1213                 else
1214                         obdo_from_la(oa, &info->fti_attr, LA_GID | LA_UID);
1215
1216                 /* don't report overquota flag if we failed before reaching
1217                  * commit */
1218                 if (old_rc == 0 && (rc == 0 || rc == -EDQUOT)) {
1219                         /* return the overquota flags to client */
1220                         if (lnb[0].lnb_flags & OBD_BRW_OVER_USRQUOTA) {
1221                                 if (oa->o_valid & OBD_MD_FLFLAGS)
1222                                         oa->o_flags |= OBD_FL_NO_USRQUOTA;
1223                                 else
1224                                         oa->o_flags = OBD_FL_NO_USRQUOTA;
1225                         }
1226
1227                         if (lnb[0].lnb_flags & OBD_BRW_OVER_GRPQUOTA) {
1228                                 if (oa->o_valid & OBD_MD_FLFLAGS)
1229                                         oa->o_flags |= OBD_FL_NO_GRPQUOTA;
1230                                 else
1231                                         oa->o_flags = OBD_FL_NO_GRPQUOTA;
1232                         }
1233
1234                         oa->o_valid |= OBD_MD_FLFLAGS;
1235                         oa->o_valid |= OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA;
1236                 }
1237         } else if (cmd == OBD_BRW_READ) {
1238                 struct ldlm_namespace *ns = ofd->ofd_namespace;
1239
1240                 /* If oa != NULL then ofd_preprw_read updated the inode
1241                  * atime and we should update the lvb so that other glimpses
1242                  * will also get the updated value. bug 5972 */
1243                 if (oa && ns && ns->ns_lvbo && ns->ns_lvbo->lvbo_update) {
1244                          struct ldlm_resource *rs = NULL;
1245
1246                         ost_fid_build_resid(fid, &info->fti_resid);
1247                         rs = ldlm_resource_get(ns, NULL, &info->fti_resid,
1248                                                LDLM_EXTENT, 0);
1249                         if (!IS_ERR(rs)) {
1250                                 ldlm_res_lvbo_update(rs, NULL, 1);
1251                                 ldlm_resource_putref(rs);
1252                         }
1253                 }
1254                 rc = ofd_commitrw_read(env, ofd, fid, objcount,
1255                                        npages, lnb);
1256                 if (old_rc)
1257                         rc = old_rc;
1258         } else {
1259                 LBUG();
1260                 rc = -EPROTO;
1261         }
1262
1263         if (oti != NULL)
1264                 ofd_info2oti(info, oti);
1265         RETURN(rc);
1266 }