lustre/mdt/mdt_open.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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, 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  * lustre/mdt/mdt_open.c
  37  *
  38  * Lustre Metadata Target (mdt) open/close file handling
  39  *
  40  * Author: Huang Hua <huanghua@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_MDS
  44
  45 #include <lustre_acl.h>
  46 #include <lustre_mds.h>
  47 #include "mdt_internal.h"
  48 #include <lustre_nodemap.h>
  49
  50 /* we do nothing because we do not have refcount now */
  51 static void mdt_mfd_get(void *mfdp)
  52 {
  53 }
  54
  55 static struct portals_handle_ops mfd_handle_ops = {
  56         .hop_addref = mdt_mfd_get,
  57         .hop_free   = NULL,
  58 };
  59
  60 /* Create a new mdt_file_data struct, initialize it,
  61  * and insert it to global hash table */
  62 struct mdt_file_data *mdt_mfd_new(const struct mdt_export_data *med)
  63 {
  64         struct mdt_file_data *mfd;
  65         ENTRY;
  66
  67         OBD_ALLOC_PTR(mfd);
  68         if (mfd != NULL) {
  69                 INIT_LIST_HEAD(&mfd->mfd_handle.h_link);
  70                 mfd->mfd_handle.h_owner = med;
  71                 INIT_LIST_HEAD(&mfd->mfd_list);
  72                 class_handle_hash(&mfd->mfd_handle, &mfd_handle_ops);
  73         }
  74
  75         RETURN(mfd);
  76 }
  77
  78 /*
  79  * Find the mfd pointed to by handle in global hash table.
  80  * In case of replay the handle is obsoleted
  81  * but mfd can be found in mfd list by that handle.
  82  * Callers need to be holding med_open_lock.
  83  */
  84 struct mdt_file_data *mdt_handle2mfd(struct mdt_export_data *med,
  85                                      const struct lustre_handle *handle,
  86                                      bool is_replay_or_resent)
  87 {
  88         struct mdt_file_data   *mfd;
  89         ENTRY;
  90
  91         LASSERT(handle != NULL);
  92         mfd = class_handle2object(handle->cookie, med);
  93         /* during dw/setattr replay the mfd can be found by old handle */
  94         if (mfd == NULL && is_replay_or_resent) {
  95                 list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
  96                         if (mfd->mfd_old_handle.cookie == handle->cookie)
  97                                 RETURN(mfd);
  98                 }
  99                 mfd = NULL;
 100         }
 101
 102         RETURN(mfd);
 103 }
 104
 105 /* free mfd */
 106 void mdt_mfd_free(struct mdt_file_data *mfd)
 107 {
 108         LASSERT(list_empty(&mfd->mfd_list));
 109         OBD_FREE_RCU(mfd, sizeof *mfd, &mfd->mfd_handle);
 110 }
 111
 112 static int mdt_create_data(struct mdt_thread_info *info,
 113                            struct mdt_object *p, struct mdt_object *o)
 114 {
 115         struct md_op_spec     *spec = &info->mti_spec;
 116         struct md_attr        *ma   = &info->mti_attr;
 117         int                    rc   = 0;
 118         ENTRY;
 119
 120         if (!md_should_create(spec->sp_cr_flags))
 121                 RETURN(0);
 122
 123         ma->ma_need = MA_INODE | MA_LOV;
 124         ma->ma_valid = 0;
 125         mutex_lock(&o->mot_lov_mutex);
 126         if (!(o->mot_flags & MOF_LOV_CREATED)) {
 127                 rc = mdo_create_data(info->mti_env,
 128                                      p ? mdt_object_child(p) : NULL,
 129                                      mdt_object_child(o), spec, ma);
 130                 if (rc == 0)
 131                         rc = mdt_attr_get_complex(info, o, ma);
 132
 133                 if (rc == 0 && ma->ma_valid & MA_LOV)
 134                         o->mot_flags |= MOF_LOV_CREATED;
 135         }
 136
 137         mutex_unlock(&o->mot_lov_mutex);
 138         RETURN(rc);
 139 }
 140
 141 static int mdt_ioepoch_opened(struct mdt_object *mo)
 142 {
 143         return mo->mot_ioepoch_count;
 144 }
 145
 146 int mdt_object_is_som_enabled(struct mdt_object *mo)
 147 {
 148         return !mo->mot_ioepoch;
 149 }
 150
 151 /**
 152  * Re-enable Size-on-MDS.
 153  * Call under ->mot_ioepoch_mutex.
 154  */
 155 static void mdt_object_som_enable(struct mdt_object *mo, __u64 ioepoch)
 156 {
 157         if (ioepoch == mo->mot_ioepoch) {
 158                 LASSERT(!mdt_ioepoch_opened(mo));
 159                 mo->mot_ioepoch = 0;
 160                 mo->mot_flags = 0;
 161         }
 162 }
 163
 164 /**
 165  * Open the IOEpoch. It is allowed if @writecount is not negative.
 166  * The epoch and writecount handling is performed under the mot_ioepoch_mutex.
 167  */
 168 int mdt_ioepoch_open(struct mdt_thread_info *info, struct mdt_object *o,
 169                      int created)
 170 {
 171         struct mdt_device *mdt = info->mti_mdt;
 172         int cancel = 0;
 173         int rc = 0;
 174         ENTRY;
 175
 176         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 177             !S_ISREG(lu_object_attr(&o->mot_obj)))
 178                 RETURN(0);
 179
 180         mutex_lock(&o->mot_ioepoch_mutex);
 181         if (mdt_ioepoch_opened(o)) {
 182                 /* Epoch continues even if there is no writers yet. */
 183                 CDEBUG(D_INODE, "continue epoch "LPU64" for "DFID"\n",
 184                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 185         } else {
 186                 /* XXX: ->mdt_ioepoch is not initialized at the mount */
 187                 spin_lock(&mdt->mdt_ioepoch_lock);
 188                 if (mdt->mdt_ioepoch < info->mti_replayepoch)
 189                         mdt->mdt_ioepoch = info->mti_replayepoch;
 190
 191                 if (info->mti_replayepoch)
 192                         o->mot_ioepoch = info->mti_replayepoch;
 193                 else if (++mdt->mdt_ioepoch == IOEPOCH_INVAL)
 194                         o->mot_ioepoch = ++mdt->mdt_ioepoch;
 195                 else
 196                         o->mot_ioepoch = mdt->mdt_ioepoch;
 197
 198                 spin_unlock(&mdt->mdt_ioepoch_lock);
 199
 200                 CDEBUG(D_INODE, "starting epoch "LPU64" for "DFID"\n",
 201                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 202                 if (created)
 203                         o->mot_flags |= MOF_SOM_CREATED;
 204                 cancel = 1;
 205         }
 206         o->mot_ioepoch_count++;
 207         mutex_unlock(&o->mot_ioepoch_mutex);
 208
 209         /* Cancel Size-on-MDS attributes cached on clients for the open case.
 210          * In the truncate case, see mdt_reint_setattr(). */
 211         if (cancel && (info->mti_rr.rr_fid1 != NULL)) {
 212                 struct mdt_lock_handle  *lh = &info->mti_lh[MDT_LH_CHILD];
 213                 mdt_lock_reg_init(lh, LCK_EX);
 214                 rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_UPDATE,
 215                                      MDT_LOCAL_LOCK);
 216                 if (rc == 0)
 217                         mdt_object_unlock(info, o, lh, 1);
 218         }
 219         RETURN(rc);
 220 }
 221
 222 /**
 223  * Update SOM on-disk attributes.
 224  * If enabling, write update inodes and lustre-ea with the proper IOEpoch,
 225  * mountid and attributes. If disabling, clean SOM xattr.
 226  * Call under ->mot_ioepoch_mutex.
 227  */
 228 static int mdt_som_attr_set(struct mdt_thread_info *info,
 229                             struct mdt_object *obj, __u64 ioepoch, bool enable)
 230 {
 231         struct md_object        *next = mdt_object_child(obj);
 232         int                      rc;
 233         ENTRY;
 234
 235         CDEBUG(D_INODE, "Size-on-MDS attribute %s for epoch "LPU64
 236                " on "DFID".\n", enable ? "update" : "disabling",
 237                ioepoch, PFID(mdt_object_fid(obj)));
 238
 239         if (enable) {
 240                 struct lu_buf           *buf = &info->mti_buf;
 241                 struct som_attrs        *attrs;
 242                 struct md_attr          *ma = &info->mti_attr;
 243                 struct lu_attr          *la = &ma->ma_attr;
 244                 struct obd_device       *obd = info->mti_mdt->mdt_lut.lut_obd;
 245
 246                 attrs = (struct som_attrs *)info->mti_xattr_buf;
 247                 CLASSERT(sizeof(info->mti_xattr_buf) >= sizeof(*attrs));
 248
 249                 /* pack SOM attributes */
 250                 memset(attrs, 0, sizeof(*attrs));
 251                 attrs->som_ioepoch = ioepoch;
 252                 attrs->som_mountid = obd->u.obt.obt_mount_count;
 253                 if ((la->la_valid & LA_SIZE) != 0)
 254                         attrs->som_size = la->la_size;
 255                 if ((la->la_valid & LA_BLOCKS) != 0)
 256                         attrs->som_blocks = la->la_blocks;
 257                 lustre_som_swab(attrs);
 258
 259                 /* update SOM attributes */
 260                 buf->lb_buf = attrs;
 261                 buf->lb_len = sizeof(*attrs);
 262                 rc = mo_xattr_set(info->mti_env, next, buf, XATTR_NAME_SOM, 0);
 263         } else {
 264                 /* delete SOM attributes */
 265                 rc = mo_xattr_del(info->mti_env, next, XATTR_NAME_SOM);
 266         }
 267
 268         RETURN(rc);
 269 }
 270
 271 /** Perform the eviction specific actions on ioepoch close. */
 272 static inline int mdt_ioepoch_close_on_eviction(struct mdt_thread_info *info,
 273                                                 struct mdt_object *o)
 274 {
 275         int rc = 0;
 276
 277         mutex_lock(&o->mot_ioepoch_mutex);
 278         CDEBUG(D_INODE, "Eviction. Closing IOepoch "LPU64" on "DFID". "
 279                "Count %d\n", o->mot_ioepoch, PFID(mdt_object_fid(o)),
 280                o->mot_ioepoch_count);
 281         o->mot_ioepoch_count--;
 282
 283         /* If eviction occured set MOF_SOM_RECOV,
 284          * if no other epoch holders, disable SOM on disk. */
 285         o->mot_flags |= MOF_SOM_CHANGE | MOF_SOM_RECOV;
 286         if (!mdt_ioepoch_opened(o)) {
 287                 rc = mdt_som_attr_set(info, o, o->mot_ioepoch, MDT_SOM_DISABLE);
 288                 mdt_object_som_enable(o, o->mot_ioepoch);
 289         }
 290         mutex_unlock(&o->mot_ioepoch_mutex);
 291         RETURN(rc);
 292 }
 293
 294 /**
 295  * Perform the replay specific actions on ioepoch close.
 296  * Skip SOM attribute update if obtained and just forget about the inode state
 297  * for the last ioepoch holder. The SOM cache is invalidated on MDS failure.
 298  */
 299 static inline int mdt_ioepoch_close_on_replay(struct mdt_thread_info *info,
 300                                               struct mdt_object *o)
 301 {
 302         int rc = MDT_IOEPOCH_CLOSED;
 303         ENTRY;
 304
 305         mutex_lock(&o->mot_ioepoch_mutex);
 306         CDEBUG(D_INODE, "Replay. Closing epoch "LPU64" on "DFID". Count %d\n",
 307                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 308         o->mot_ioepoch_count--;
 309
 310         /* Get an info from the replayed request if client is supposed
 311          * to send an Attibute Update, reconstruct @rc if so */
 312         if (info->mti_ioepoch->flags & MF_SOM_AU)
 313                 rc = MDT_IOEPOCH_GETATTR;
 314
 315         if (!mdt_ioepoch_opened(o))
 316                 mdt_object_som_enable(o, info->mti_ioepoch->ioepoch);
 317         mutex_unlock(&o->mot_ioepoch_mutex);
 318
 319         RETURN(rc);
 320 }
 321
 322 /**
 323  * Regular file IOepoch close.
 324  * Closes the ioepoch, checks the object state, apply obtained attributes and
 325  * re-enable SOM on the object, if possible. Also checks if the recovery is
 326  * needed and packs OBD_MD_FLGETATTRLOCK flag into the reply to force the client
 327  * to obtain SOM attributes under the server-side OST locks.
 328  *
 329  * Return value:
 330  * MDT_IOEPOCH_CLOSED if ioepoch is closed.
 331  * MDT_IOEPOCH_GETATTR if ioepoch is closed but another SOM update is needed.
 332  */
 333 static inline int mdt_ioepoch_close_reg(struct mdt_thread_info *info,
 334                                         struct mdt_object *o)
 335 {
 336         struct md_attr *tmp_ma;
 337         struct lu_attr *la;
 338         int achange, opened;
 339         int recovery = 0;
 340         int rc = 0, ret = MDT_IOEPOCH_CLOSED;
 341         ENTRY;
 342
 343         la = &info->mti_attr.ma_attr;
 344         achange = (info->mti_ioepoch->flags & MF_SOM_CHANGE);
 345
 346         mutex_lock(&o->mot_ioepoch_mutex);
 347         o->mot_ioepoch_count--;
 348
 349         tmp_ma = &info->mti_u.som.attr;
 350         tmp_ma->ma_lmm = info->mti_attr.ma_lmm;
 351         tmp_ma->ma_lmm_size = info->mti_attr.ma_lmm_size;
 352         tmp_ma->ma_som = &info->mti_u.som.data;
 353         tmp_ma->ma_need = MA_INODE | MA_LOV | MA_SOM;
 354         tmp_ma->ma_valid = 0;
 355         rc = mdt_attr_get_complex(info, o, tmp_ma);
 356         if (rc)
 357                 GOTO(error_up, rc);
 358
 359         /* Check the on-disk SOM state. */
 360         if (o->mot_flags & MOF_SOM_RECOV)
 361                 recovery = 1;
 362         else if (!(o->mot_flags & MOF_SOM_CREATED) &&
 363                  !(tmp_ma->ma_valid & MA_SOM))
 364                 recovery = 1;
 365
 366         CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
 367                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 368
 369         opened = mdt_ioepoch_opened(o);
 370         /**
 371          * If IOEpoch is not opened, check if a Size-on-MDS update is needed.
 372          * Skip the check for file with no LOV  or for unlink files.
 373          */
 374         if (!opened && tmp_ma->ma_valid & MA_LOV &&
 375             !(tmp_ma->ma_valid & MA_INODE && tmp_ma->ma_attr.la_nlink == 0)) {
 376                 if (recovery)
 377                         /* If some previous writer was evicted, re-ask the
 378                          * client for attributes. Even if attributes are
 379                          * provided, we cannot believe in them.
 380                          * Another use case is that there is no SOM cache on
 381                          * disk -- first access with SOM or there was an MDS
 382                          * failure. */
 383                         ret = MDT_IOEPOCH_GETATTR;
 384                 else if (o->mot_flags & MOF_SOM_CHANGE)
 385                         /* Some previous writer changed the attribute.
 386                          * Do not believe to the current Size-on-MDS
 387                          * update, re-ask client. */
 388                         ret = MDT_IOEPOCH_GETATTR;
 389                 else if (!(la->la_valid & LA_SIZE) && achange)
 390                         /* Attributes were changed by the last writer
 391                          * only but no Size-on-MDS update is received.*/
 392                         ret = MDT_IOEPOCH_GETATTR;
 393         }
 394
 395         if (achange || ret == MDT_IOEPOCH_GETATTR)
 396                 o->mot_flags |= MOF_SOM_CHANGE;
 397
 398         /* If epoch ends and relable SOM attributes are obtained, update them.
 399          * Create SOM ea for new files even if there is no attributes obtained
 400          * (0-length file). */
 401         if (ret == MDT_IOEPOCH_CLOSED && !opened) {
 402                 if (achange || o->mot_flags & MOF_SOM_CREATED) {
 403                         LASSERT(achange || !(la->la_valid & LA_SIZE));
 404                         rc = mdt_som_attr_set(info, o, o->mot_ioepoch,
 405                                               MDT_SOM_ENABLE);
 406                         /* Avoid the following setattrs of these attributes,
 407                          * e.g. for atime update. */
 408                         info->mti_attr.ma_valid = 0;
 409                 }
 410                 mdt_object_som_enable(o, o->mot_ioepoch);
 411         }
 412
 413         mutex_unlock(&o->mot_ioepoch_mutex);
 414         /* If recovery is needed, tell the client to perform GETATTR under
 415          * the lock. */
 416         if (ret == MDT_IOEPOCH_GETATTR && recovery) {
 417                 struct mdt_body *rep;
 418                 rep = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 419                 rep->mbo_valid |= OBD_MD_FLGETATTRLOCK;
 420         }
 421
 422         RETURN(rc ? : ret);
 423
 424 error_up:
 425         mutex_unlock(&o->mot_ioepoch_mutex);
 426         return rc;
 427 }
 428
 429 /**
 430  * Close IOEpoch (opened file or MDS_FMODE_EPOCH state). It happens if:
 431  * - a client closes the IOEpoch;
 432  * - a client eviction occured.
 433  * Return values:
 434  * MDT_IOEPOCH_OPENED if the client does not close IOEpoch.
 435  * MDT_IOEPOCH_CLOSED if the client closes IOEpoch.
 436  * MDT_IOEPOCH_GETATTR if the client closes IOEpoch but another SOM attribute
 437  * update is needed.
 438  */
 439 static int mdt_ioepoch_close(struct mdt_thread_info *info, struct mdt_object *o)
 440 {
 441         struct ptlrpc_request *req = mdt_info_req(info);
 442         ENTRY;
 443
 444         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 445             !S_ISREG(lu_object_attr(&o->mot_obj)))
 446                 RETURN(0);
 447
 448         LASSERT(o->mot_ioepoch_count);
 449         LASSERT(info->mti_ioepoch == NULL ||
 450                 info->mti_ioepoch->ioepoch == o->mot_ioepoch);
 451
 452         /* IOEpoch is closed only if client tells about it or eviction occures.
 453          * In the replay case, always close the epoch. */
 454         if (req == NULL)
 455                 RETURN(mdt_ioepoch_close_on_eviction(info, o));
 456         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
 457                 RETURN(mdt_ioepoch_close_on_replay(info, o));
 458         if (info->mti_ioepoch && (info->mti_ioepoch->flags & MF_EPOCH_CLOSE))
 459                 RETURN(mdt_ioepoch_close_reg(info, o));
 460         /* IO epoch is not closed. */
 461         RETURN(MDT_IOEPOCH_OPENED);
 462 }
 463
 464 /**
 465  * Close MDS_FMODE_SOM state, when IOEpoch is already closed and we are waiting
 466  * for attribute update. It happens if:
 467  * - SOM Attribute Update is obtained;
 468  * - the client failed to obtain it and informs MDS about it;
 469  * - a client eviction occured.
 470  * Apply obtained attributes for the 1st case, wipe out the on-disk SOM
 471  * cache otherwise.
 472  */
 473 int mdt_som_au_close(struct mdt_thread_info *info, struct mdt_object *o)
 474 {
 475         struct ptlrpc_request   *req = mdt_info_req(info);
 476         __u64                    ioepoch = 0;
 477         int                      act = MDT_SOM_ENABLE;
 478         int                      rc = 0;
 479         ENTRY;
 480
 481         LASSERT(!req || info->mti_ioepoch);
 482         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 483             !S_ISREG(lu_object_attr(&o->mot_obj)))
 484                 RETURN(0);
 485
 486         /* No size whereas MF_SOM_CHANGE is set means client failed to
 487          * obtain ost attributes, drop the SOM cache on disk if so. */
 488         if (!req ||
 489             (info->mti_ioepoch &&
 490              info->mti_ioepoch->flags & MF_SOM_CHANGE &&
 491              !(info->mti_attr.ma_attr.la_valid & LA_SIZE)))
 492                 act = MDT_SOM_DISABLE;
 493
 494         mutex_lock(&o->mot_ioepoch_mutex);
 495         /* Mark the object it is the recovery state if we failed to obtain
 496          * SOM attributes. */
 497         if (act == MDT_SOM_DISABLE)
 498                 o->mot_flags |= MOF_SOM_RECOV;
 499
 500         if (!mdt_ioepoch_opened(o)) {
 501                 ioepoch =  info->mti_ioepoch ?
 502                         info->mti_ioepoch->ioepoch : o->mot_ioepoch;
 503
 504                 if (req != NULL
 505                     && !(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 506                         rc = mdt_som_attr_set(info, o, ioepoch, act);
 507                 mdt_object_som_enable(o, ioepoch);
 508         }
 509         mutex_unlock(&o->mot_ioepoch_mutex);
 510         RETURN(rc);
 511 }
 512
 513 int mdt_write_read(struct mdt_object *o)
 514 {
 515         int rc = 0;
 516         ENTRY;
 517         mutex_lock(&o->mot_ioepoch_mutex);
 518         rc = o->mot_writecount;
 519         mutex_unlock(&o->mot_ioepoch_mutex);
 520         RETURN(rc);
 521 }
 522
 523 int mdt_write_get(struct mdt_object *o)
 524 {
 525         int rc = 0;
 526         ENTRY;
 527         mutex_lock(&o->mot_ioepoch_mutex);
 528         if (o->mot_writecount < 0)
 529                 rc = -ETXTBSY;
 530         else
 531                 o->mot_writecount++;
 532         mutex_unlock(&o->mot_ioepoch_mutex);
 533         RETURN(rc);
 534 }
 535
 536 void mdt_write_put(struct mdt_object *o)
 537 {
 538         ENTRY;
 539         mutex_lock(&o->mot_ioepoch_mutex);
 540         o->mot_writecount--;
 541         mutex_unlock(&o->mot_ioepoch_mutex);
 542         EXIT;
 543 }
 544
 545 static int mdt_write_deny(struct mdt_object *o)
 546 {
 547         int rc = 0;
 548         ENTRY;
 549         mutex_lock(&o->mot_ioepoch_mutex);
 550         if (o->mot_writecount > 0)
 551                 rc = -ETXTBSY;
 552         else
 553                 o->mot_writecount--;
 554         mutex_unlock(&o->mot_ioepoch_mutex);
 555         RETURN(rc);
 556 }
 557
 558 static void mdt_write_allow(struct mdt_object *o)
 559 {
 560         ENTRY;
 561         mutex_lock(&o->mot_ioepoch_mutex);
 562         o->mot_writecount++;
 563         mutex_unlock(&o->mot_ioepoch_mutex);
 564         EXIT;
 565 }
 566
 567 /* there can be no real transaction so prepare the fake one */
 568 static void mdt_empty_transno(struct mdt_thread_info *info, int rc)
 569 {
 570         struct mdt_device      *mdt = info->mti_mdt;
 571         struct ptlrpc_request  *req = mdt_info_req(info);
 572         struct tg_export_data  *ted;
 573         struct lsd_client_data *lcd;
 574
 575         ENTRY;
 576         /* transaction has occurred already */
 577         if (lustre_msg_get_transno(req->rq_repmsg) != 0)
 578                 RETURN_EXIT;
 579
 580         spin_lock(&mdt->mdt_lut.lut_translock);
 581         if (rc != 0) {
 582                 if (info->mti_transno != 0) {
 583                         struct obd_export *exp = req->rq_export;
 584
 585                         CERROR("%s: replay trans "LPU64" NID %s: rc = %d\n",
 586                                mdt_obd_name(mdt), info->mti_transno,
 587                                libcfs_nid2str(exp->exp_connection->c_peer.nid),
 588                                rc);
 589                         spin_unlock(&mdt->mdt_lut.lut_translock);
 590                         RETURN_EXIT;
 591                 }
 592         } else if (info->mti_transno == 0) {
 593                 info->mti_transno = ++mdt->mdt_lut.lut_last_transno;
 594         } else {
 595                 /* should be replay */
 596                 if (info->mti_transno > mdt->mdt_lut.lut_last_transno)
 597                         mdt->mdt_lut.lut_last_transno = info->mti_transno;
 598         }
 599         spin_unlock(&mdt->mdt_lut.lut_translock);
 600
 601         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 602                info->mti_transno,
 603                req->rq_export->exp_obd->obd_last_committed);
 604
 605         req->rq_transno = info->mti_transno;
 606         lustre_msg_set_transno(req->rq_repmsg, info->mti_transno);
 607
 608         /* update lcd in memory only for resent cases */
 609         ted = &req->rq_export->exp_target_data;
 610         LASSERT(ted);
 611         mutex_lock(&ted->ted_lcd_lock);
 612         lcd = ted->ted_lcd;
 613         if (info->mti_transno < lcd->lcd_last_transno &&
 614             info->mti_transno != 0) {
 615                 /* This should happen during replay. Do not update
 616                  * last rcvd info if replay req transno < last transno,
 617                  * otherwise the following resend(after replay) can not
 618                  * be checked correctly by xid */
 619                 mutex_unlock(&ted->ted_lcd_lock);
 620                 CDEBUG(D_HA, "%s: transno = "LPU64" < last_transno = "LPU64"\n",
 621                        mdt_obd_name(mdt), info->mti_transno,
 622                        lcd->lcd_last_transno);
 623                 RETURN_EXIT;
 624         }
 625
 626         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 627             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 628                 if (info->mti_transno != 0)
 629                         lcd->lcd_last_close_transno = info->mti_transno;
 630                 lcd->lcd_last_close_xid = req->rq_xid;
 631                 lcd->lcd_last_close_result = rc;
 632         } else {
 633                 /* VBR: save versions in last_rcvd for reconstruct. */
 634                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 635                 if (pre_versions) {
 636                         lcd->lcd_pre_versions[0] = pre_versions[0];
 637                         lcd->lcd_pre_versions[1] = pre_versions[1];
 638                         lcd->lcd_pre_versions[2] = pre_versions[2];
 639                         lcd->lcd_pre_versions[3] = pre_versions[3];
 640                 }
 641                 if (info->mti_transno != 0)
 642                         lcd->lcd_last_transno = info->mti_transno;
 643
 644                 lcd->lcd_last_xid = req->rq_xid;
 645                 lcd->lcd_last_result = rc;
 646                 lcd->lcd_last_data = info->mti_opdata;
 647         }
 648         mutex_unlock(&ted->ted_lcd_lock);
 649
 650         EXIT;
 651 }
 652
 653 void mdt_mfd_set_mode(struct mdt_file_data *mfd, __u64 mode)
 654 {
 655         LASSERT(mfd != NULL);
 656
 657         CDEBUG(D_HA, DFID " Change mfd mode "LPO64" -> "LPO64".\n",
 658                PFID(mdt_object_fid(mfd->mfd_object)), mfd->mfd_mode, mode);
 659
 660         mfd->mfd_mode = mode;
 661 }
 662
 663 /**
 664  * prep ma_lmm/ma_lmv for md_attr from reply
 665  */
 666 void mdt_prep_ma_buf_from_rep(struct mdt_thread_info *info,
 667                               struct mdt_object *obj,
 668                               struct md_attr *ma)
 669 {
 670         LASSERT(ma->ma_lmv == NULL && ma->ma_lmm == NULL);
 671         if (S_ISDIR(obj->mot_header.loh_attr)) {
 672                 ma->ma_lmv = req_capsule_server_get(info->mti_pill,
 673                                                     &RMF_MDT_MD);
 674                 ma->ma_lmv_size = req_capsule_get_size(info->mti_pill,
 675                                                        &RMF_MDT_MD,
 676                                                        RCL_SERVER);
 677                 if (ma->ma_lmv_size > 0)
 678                         ma->ma_need |= MA_LMV;
 679         } else {
 680                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
 681                                                     &RMF_MDT_MD);
 682                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 683                                                        &RMF_MDT_MD,
 684                                                        RCL_SERVER);
 685                 if (ma->ma_lmm_size > 0)
 686                         ma->ma_need |= MA_LOV;
 687         }
 688 }
 689
 690 static int mdt_mfd_open(struct mdt_thread_info *info, struct mdt_object *p,
 691                         struct mdt_object *o, __u64 flags, int created,
 692                         struct ldlm_reply *rep)
 693 {
 694         struct ptlrpc_request   *req = mdt_info_req(info);
 695         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 696         struct mdt_file_data    *mfd;
 697         struct md_attr          *ma  = &info->mti_attr;
 698         struct lu_attr          *la  = &ma->ma_attr;
 699         struct mdt_body         *repbody;
 700         int                      rc = 0, isdir, isreg;
 701         ENTRY;
 702
 703         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 704
 705         isreg = S_ISREG(la->la_mode);
 706         isdir = S_ISDIR(la->la_mode);
 707         if (isreg && !(ma->ma_valid & MA_LOV) && !(flags & MDS_OPEN_RELEASE)) {
 708                 /*
 709                  * No EA, check whether it is will set regEA and dirEA since in
 710                  * above attr get, these size might be zero, so reset it, to
 711                  * retrieve the MD after create obj.
 712                  */
 713                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 714                                                        &RMF_MDT_MD,
 715                                                        RCL_SERVER);
 716                 /* in replay case, p == NULL */
 717                 rc = mdt_create_data(info, p, o);
 718                 if (rc)
 719                         RETURN(rc);
 720
 721                 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_DISP_STRIPE)
 722                         mdt_set_disposition(info, rep, DISP_OPEN_STRIPE);
 723         }
 724
 725         CDEBUG(D_INODE, "after open, ma_valid bit = "LPX64" lmm_size = %d\n",
 726                ma->ma_valid, ma->ma_lmm_size);
 727
 728         if (ma->ma_valid & MA_LOV) {
 729                 LASSERT(ma->ma_lmm_size != 0);
 730                 repbody->mbo_eadatasize = ma->ma_lmm_size;
 731                 if (isdir)
 732                         repbody->mbo_valid |= OBD_MD_FLDIREA;
 733                 else
 734                         repbody->mbo_valid |= OBD_MD_FLEASIZE;
 735         }
 736
 737         if (ma->ma_valid & MA_LMV) {
 738                 LASSERT(ma->ma_lmv_size != 0);
 739                 repbody->mbo_eadatasize = ma->ma_lmv_size;
 740                 LASSERT(isdir);
 741                 repbody->mbo_valid |= OBD_MD_FLDIREA | OBD_MD_MEA;
 742         }
 743
 744         if (flags & FMODE_WRITE) {
 745                 rc = mdt_write_get(o);
 746                 if (rc == 0) {
 747                         mdt_ioepoch_open(info, o, created);
 748                         repbody->mbo_ioepoch = o->mot_ioepoch;
 749                 }
 750         } else if (flags & MDS_FMODE_EXEC) {
 751                 rc = mdt_write_deny(o);
 752         }
 753         if (rc)
 754                 RETURN(rc);
 755
 756         rc = mo_open(info->mti_env, mdt_object_child(o),
 757                      created ? flags | MDS_OPEN_CREATED : flags);
 758         if (rc)
 759                 GOTO(err_out, rc);
 760
 761         mfd = mdt_mfd_new(med);
 762         if (mfd == NULL)
 763                 GOTO(err_out, rc = -ENOMEM);
 764
 765         /*
 766          * Keep a reference on this object for this open, and is
 767          * released by mdt_mfd_close().
 768          */
 769         mdt_object_get(info->mti_env, o);
 770         mfd->mfd_object = o;
 771         mfd->mfd_xid = req->rq_xid;
 772
 773         /*
 774          * @flags is always not zero. At least it should be FMODE_READ,
 775          * FMODE_WRITE or MDS_FMODE_EXEC.
 776          */
 777         LASSERT(flags != 0);
 778
 779         /* Open handling. */
 780         mdt_mfd_set_mode(mfd, flags);
 781
 782         atomic_inc(&o->mot_open_count);
 783         if (flags & MDS_OPEN_LEASE)
 784                 atomic_inc(&o->mot_lease_count);
 785
 786         /* replay handle */
 787         if (req_is_replay(req)) {
 788                 struct mdt_file_data *old_mfd;
 789                 /* Check wheather old cookie already exist in
 790                  * the list, becasue when do recovery, client
 791                  * might be disconnected from server, and
 792                  * restart replay, so there maybe some orphan
 793                  * mfd here, we should remove them */
 794                 LASSERT(info->mti_rr.rr_handle != NULL);
 795                 spin_lock(&med->med_open_lock);
 796                 old_mfd = mdt_handle2mfd(med, info->mti_rr.rr_handle, true);
 797                 if (old_mfd != NULL) {
 798                         CDEBUG(D_HA, "delete orphan mfd = %p, fid = "DFID", "
 799                                "cookie = "LPX64"\n", mfd,
 800                                PFID(mdt_object_fid(mfd->mfd_object)),
 801                                info->mti_rr.rr_handle->cookie);
 802                         class_handle_unhash(&old_mfd->mfd_handle);
 803                         list_del_init(&old_mfd->mfd_list);
 804                         spin_unlock(&med->med_open_lock);
 805                         /* no attr update for that close */
 806                         la->la_valid = 0;
 807                         ma->ma_valid |= MA_FLAGS;
 808                         ma->ma_attr_flags |= MDS_RECOV_OPEN;
 809                         mdt_mfd_close(info, old_mfd);
 810                         ma->ma_attr_flags &= ~MDS_RECOV_OPEN;
 811                         ma->ma_valid &= ~MA_FLAGS;
 812                 } else {
 813                         spin_unlock(&med->med_open_lock);
 814                         CDEBUG(D_HA, "orphan mfd not found, fid = "DFID", "
 815                                "cookie = "LPX64"\n",
 816                                PFID(mdt_object_fid(mfd->mfd_object)),
 817                                info->mti_rr.rr_handle->cookie);
 818                 }
 819
 820                 CDEBUG(D_HA, "Store old cookie "LPX64" in new mfd\n",
 821                        info->mti_rr.rr_handle->cookie);
 822
 823                 mfd->mfd_old_handle.cookie = info->mti_rr.rr_handle->cookie;
 824         }
 825
 826         repbody->mbo_handle.cookie = mfd->mfd_handle.h_cookie;
 827
 828         if (req->rq_export->exp_disconnected) {
 829                 spin_lock(&med->med_open_lock);
 830                 class_handle_unhash(&mfd->mfd_handle);
 831                 list_del_init(&mfd->mfd_list);
 832                 spin_unlock(&med->med_open_lock);
 833                 mdt_mfd_close(info, mfd);
 834         } else {
 835                 spin_lock(&med->med_open_lock);
 836                 list_add(&mfd->mfd_list, &med->med_open_head);
 837                 spin_unlock(&med->med_open_lock);
 838         }
 839
 840         mdt_empty_transno(info, rc);
 841
 842         RETURN(rc);
 843
 844 err_out:
 845         if (flags & FMODE_WRITE)
 846                 /* XXX We also need to close io epoch here.
 847                  * See LU-1220 - green */
 848                 mdt_write_put(o);
 849         else if (flags & MDS_FMODE_EXEC)
 850                 mdt_write_allow(o);
 851
 852         return rc;
 853 }
 854
 855 int mdt_finish_open(struct mdt_thread_info *info,
 856                     struct mdt_object *p, struct mdt_object *o,
 857                     __u64 flags, int created, struct ldlm_reply *rep)
 858 {
 859         struct ptlrpc_request   *req = mdt_info_req(info);
 860         struct obd_export       *exp = req->rq_export;
 861         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 862         struct md_attr          *ma  = &info->mti_attr;
 863         struct lu_attr          *la  = &ma->ma_attr;
 864         struct mdt_file_data    *mfd;
 865         struct mdt_body         *repbody;
 866         int                      rc = 0;
 867         int                      isreg, isdir, islnk;
 868         struct list_head        *t;
 869         ENTRY;
 870
 871         LASSERT(ma->ma_valid & MA_INODE);
 872
 873         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 874
 875         isreg = S_ISREG(la->la_mode);
 876         isdir = S_ISDIR(la->la_mode);
 877         islnk = S_ISLNK(la->la_mode);
 878         mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 879
 880         /* LU-2275, simulate broken behaviour (esp. prevalent in
 881          * pre-2.4 servers where a very strange reply is sent on error
 882          * that looks like it was actually almost succesful and a failure at the
 883          * same time */
 884         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_NEGATIVE_POSITIVE)) {
 885                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN |
 886                                                DISP_LOOKUP_NEG |
 887                                                DISP_LOOKUP_POS);
 888
 889                 if (flags & MDS_OPEN_LOCK)
 890                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
 891
 892                 RETURN(-ENOENT);
 893         }
 894
 895         if (exp_connect_rmtclient(exp)) {
 896                 void *buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 897
 898                 rc = mdt_pack_remote_perm(info, o, buf);
 899                 if (rc) {
 900                         repbody->mbo_valid &= ~OBD_MD_FLRMTPERM;
 901                         repbody->mbo_aclsize = 0;
 902                 } else {
 903                         repbody->mbo_valid |= OBD_MD_FLRMTPERM;
 904                         repbody->mbo_aclsize = sizeof(struct mdt_remote_perm);
 905                 }
 906         }
 907 #ifdef CONFIG_FS_POSIX_ACL
 908         else if (exp_connect_flags(exp) & OBD_CONNECT_ACL)
 909                 rc = mdt_pack_acl2body(info, repbody, o,
 910                                        exp->exp_target_data.ted_nodemap);
 911 #endif
 912
 913         if (info->mti_mdt->mdt_lut.lut_mds_capa &&
 914             exp_connect_flags(exp) & OBD_CONNECT_MDS_CAPA) {
 915                 struct lustre_capa *capa;
 916
 917                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
 918                 LASSERT(capa);
 919                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 920                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 921                 if (rc)
 922                         RETURN(rc);
 923                 repbody->mbo_valid |= OBD_MD_FLMDSCAPA;
 924         }
 925         if (info->mti_mdt->mdt_lut.lut_oss_capa &&
 926             exp_connect_flags(exp) & OBD_CONNECT_OSS_CAPA &&
 927             S_ISREG(lu_object_attr(&o->mot_obj))) {
 928                 struct lustre_capa *capa;
 929
 930                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
 931                 LASSERT(capa);
 932                 capa->lc_opc = CAPA_OPC_OSS_DEFAULT | capa_open_opc(flags);
 933                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 934                 if (rc)
 935                         RETURN(rc);
 936                 repbody->mbo_valid |= OBD_MD_FLOSSCAPA;
 937         }
 938
 939         /*
 940          * If we are following a symlink, don't open; and do not return open
 941          * handle for special nodes as client required.
 942          */
 943         if (islnk || (!isreg && !isdir &&
 944             (exp_connect_flags(req->rq_export) & OBD_CONNECT_NODEVOH))) {
 945                 lustre_msg_set_transno(req->rq_repmsg, 0);
 946                 RETURN(0);
 947         }
 948
 949         /*
 950          * We need to return the existing object's fid back, so it is done here,
 951          * after preparing the reply.
 952          */
 953         if (!created && (flags & MDS_OPEN_EXCL) && (flags & MDS_OPEN_CREAT))
 954                 RETURN(-EEXIST);
 955
 956         /* This can't be done earlier, we need to return reply body */
 957         if (isdir) {
 958                 if (flags & (MDS_OPEN_CREAT | FMODE_WRITE)) {
 959                         /* We are trying to create or write an existing dir. */
 960                         RETURN(-EISDIR);
 961                 }
 962         } else if (flags & MDS_OPEN_DIRECTORY)
 963                 RETURN(-ENOTDIR);
 964
 965         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_OPEN_CREATE,
 966                                  OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE)) {
 967                 RETURN(-EAGAIN);
 968         }
 969
 970         mfd = NULL;
 971         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
 972                 spin_lock(&med->med_open_lock);
 973                 list_for_each(t, &med->med_open_head) {
 974                         mfd = list_entry(t, struct mdt_file_data, mfd_list);
 975                         if (mfd->mfd_xid == req->rq_xid)
 976                                 break;
 977                         mfd = NULL;
 978                 }
 979                 spin_unlock(&med->med_open_lock);
 980
 981                 if (mfd != NULL) {
 982                         repbody->mbo_handle.cookie = mfd->mfd_handle.h_cookie;
 983                         /* set repbody->ea_size for resent case */
 984                         if (ma->ma_valid & MA_LOV) {
 985                                 LASSERT(ma->ma_lmm_size != 0);
 986                                 repbody->mbo_eadatasize = ma->ma_lmm_size;
 987                                 if (isdir)
 988                                         repbody->mbo_valid |= OBD_MD_FLDIREA;
 989                                 else
 990                                         repbody->mbo_valid |= OBD_MD_FLEASIZE;
 991                         }
 992                         mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 993                         RETURN(0);
 994                 }
 995         }
 996
 997         rc = mdt_mfd_open(info, p, o, flags, created, rep);
 998         if (!rc)
 999                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
1000
1001         RETURN(rc);
1002 }
1003
1004 extern void mdt_req_from_lcd(struct ptlrpc_request *req,
1005                              struct lsd_client_data *lcd);
1006
1007 void mdt_reconstruct_open(struct mdt_thread_info *info,
1008                           struct mdt_lock_handle *lhc)
1009 {
1010         const struct lu_env *env = info->mti_env;
1011         struct mdt_device       *mdt  = info->mti_mdt;
1012         struct req_capsule      *pill = info->mti_pill;
1013         struct ptlrpc_request   *req  = mdt_info_req(info);
1014         struct tg_export_data   *ted  = &req->rq_export->exp_target_data;
1015         struct lsd_client_data  *lcd  = ted->ted_lcd;
1016         struct md_attr          *ma   = &info->mti_attr;
1017         struct mdt_reint_record *rr   = &info->mti_rr;
1018         __u64                   flags = info->mti_spec.sp_cr_flags;
1019         struct ldlm_reply       *ldlm_rep;
1020         struct mdt_object       *parent;
1021         struct mdt_object       *child;
1022         struct mdt_body         *repbody;
1023         int                      rc;
1024         ENTRY;
1025
1026         LASSERT(pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
1027         ldlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
1028         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1029
1030         ma->ma_need = MA_INODE | MA_HSM;
1031         ma->ma_valid = 0;
1032
1033         mdt_req_from_lcd(req, lcd);
1034         mdt_set_disposition(info, ldlm_rep, lcd->lcd_last_data);
1035
1036         CDEBUG(D_INODE, "This is reconstruct open: disp="LPX64", result=%d\n",
1037                ldlm_rep->lock_policy_res1, req->rq_status);
1038
1039         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE) &&
1040             req->rq_status != 0)
1041                 /* We did not create successfully, return error to client. */
1042                 GOTO(out, rc = req->rq_status);
1043
1044         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE)) {
1045                 struct obd_export *exp = req->rq_export;
1046                 /*
1047                  * We failed after creation, but we do not know in which step
1048                  * we failed. So try to check the child object.
1049                  */
1050                 parent = mdt_object_find(env, mdt, rr->rr_fid1);
1051                 if (IS_ERR(parent)) {
1052                         rc = PTR_ERR(parent);
1053                         LCONSOLE_WARN("Parent "DFID" lookup error %d."
1054                                       " Evicting client %s with export %s.\n",
1055                                       PFID(rr->rr_fid1), rc,
1056                                       obd_uuid2str(&exp->exp_client_uuid),
1057                                       obd_export_nid2str(exp));
1058                         mdt_export_evict(exp);
1059                         RETURN_EXIT;
1060                 }
1061
1062                 child = mdt_object_find(env, mdt, rr->rr_fid2);
1063                 if (IS_ERR(child)) {
1064                         rc = PTR_ERR(child);
1065                         LCONSOLE_WARN("cannot lookup child "DFID": rc = %d; "
1066                                       "evicting client %s with export %s\n",
1067                                       PFID(rr->rr_fid2), rc,
1068                                       obd_uuid2str(&exp->exp_client_uuid),
1069                                       obd_export_nid2str(exp));
1070                         mdt_object_put(env, parent);
1071                         mdt_export_evict(exp);
1072                         RETURN_EXIT;
1073                 }
1074
1075                 if (unlikely(mdt_object_remote(child))) {
1076                         /* the child object was created on remote server */
1077                         if (!mdt_is_dne_client(exp)) {
1078                                 /* Return -EIO for old client */
1079                                 mdt_object_put(env, parent);
1080                                 mdt_object_put(env, child);
1081                                 GOTO(out, rc = -EIO);
1082                         }
1083                         repbody->mbo_fid1 = *rr->rr_fid2;
1084                         repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
1085                         rc = 0;
1086                 } else {
1087                         if (mdt_object_exists(child)) {
1088                                 mdt_set_capainfo(info, 1, rr->rr_fid2,
1089                                                  BYPASS_CAPA);
1090                                 mdt_prep_ma_buf_from_rep(info, child, ma);
1091                                 rc = mdt_attr_get_complex(info, child, ma);
1092                                 if (rc == 0)
1093                                         rc = mdt_finish_open(info, parent,
1094                                                              child, flags,
1095                                                              1, ldlm_rep);
1096                         } else {
1097                                 /* the child does not exist, we should do
1098                                  * regular open */
1099                                 mdt_object_put(env, parent);
1100                                 mdt_object_put(env, child);
1101                                 GOTO(regular_open, 0);
1102                         }
1103                 }
1104                 mdt_object_put(env, parent);
1105                 mdt_object_put(env, child);
1106                 GOTO(out, rc);
1107         } else {
1108 regular_open:
1109                 /* We did not try to create, so we are a pure open */
1110                 rc = mdt_reint_open(info, lhc);
1111         }
1112
1113         EXIT;
1114 out:
1115         req->rq_status = rc;
1116         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1117         LASSERT(ergo(rc < 0, lustre_msg_get_transno(req->rq_repmsg) == 0));
1118 }
1119
1120 int mdt_open_by_fid(struct mdt_thread_info *info, struct ldlm_reply *rep)
1121 {
1122         __u64                    flags = info->mti_spec.sp_cr_flags;
1123         struct mdt_reint_record *rr = &info->mti_rr;
1124         struct md_attr          *ma = &info->mti_attr;
1125         struct mdt_object       *o;
1126         int                      rc;
1127         ENTRY;
1128
1129         o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
1130         if (IS_ERR(o))
1131                 RETURN(rc = PTR_ERR(o));
1132
1133         if (unlikely(mdt_object_remote(o))) {
1134                 /* the child object was created on remote server */
1135                 struct mdt_body *repbody;
1136
1137                 mdt_set_disposition(info, rep, (DISP_IT_EXECD |
1138                                                 DISP_LOOKUP_EXECD |
1139                                                 DISP_LOOKUP_POS));
1140                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1141                 repbody->mbo_fid1 = *rr->rr_fid2;
1142                 repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
1143                 rc = 0;
1144         } else {
1145                 if (mdt_object_exists(o)) {
1146                         mdt_set_disposition(info, rep, (DISP_IT_EXECD |
1147                                                         DISP_LOOKUP_EXECD |
1148                                                         DISP_LOOKUP_POS));
1149                         mdt_prep_ma_buf_from_rep(info, o, ma);
1150                         rc = mdt_attr_get_complex(info, o, ma);
1151                         if (rc == 0)
1152                                 rc = mdt_finish_open(info, NULL, o, flags, 0,
1153                                                      rep);
1154                 } else {
1155                         rc = -ENOENT;
1156                 }
1157         }
1158
1159         mdt_object_put(info->mti_env, o);
1160         RETURN(rc);
1161 }
1162
1163 /* lock object for open */
1164 static int mdt_object_open_lock(struct mdt_thread_info *info,
1165                                 struct mdt_object *obj,
1166                                 struct mdt_lock_handle *lhc,
1167                                 __u64 *ibits)
1168 {
1169         struct md_attr  *ma = &info->mti_attr;
1170         __u64            open_flags = info->mti_spec.sp_cr_flags;
1171         ldlm_mode_t      lm = LCK_CR;
1172         bool             acq_lease = !!(open_flags & MDS_OPEN_LEASE);
1173         bool             try_layout = false;
1174         bool             create_layout = false;
1175         int              rc = 0;
1176         ENTRY;
1177
1178         *ibits = 0;
1179         mdt_lock_handle_init(lhc);
1180
1181         if (req_is_replay(mdt_info_req(info)))
1182                 RETURN(0);
1183
1184         if (S_ISREG(lu_object_attr(&obj->mot_obj))) {
1185                 if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV) &&
1186                     md_should_create(open_flags))
1187                         create_layout = true;
1188                 if (exp_connect_layout(info->mti_exp) && !create_layout &&
1189                     ma->ma_need & MA_LOV)
1190                         try_layout = true;
1191         }
1192
1193         if (acq_lease) {
1194                 /* lease open, acquire write mode of open sem */
1195                 down_write(&obj->mot_open_sem);
1196
1197                 /* Lease exists and ask for new lease */
1198                 if (atomic_read(&obj->mot_lease_count) > 0) {
1199                         /* only exclusive open is supported, so lease
1200                          * are conflicted to each other */
1201                         GOTO(out, rc = -EBUSY);
1202                 }
1203
1204                 /* Lease must be with open lock */
1205                 if (!(open_flags & MDS_OPEN_LOCK)) {
1206                         CERROR("Request lease for file:"DFID ", but open lock "
1207                                 "is missed, open_flags = "LPO64".\n",
1208                                 PFID(mdt_object_fid(obj)), open_flags);
1209                         GOTO(out, rc = -EPROTO);
1210                 }
1211
1212                 /* XXX: only exclusive open is supported. */
1213                 lm = LCK_EX;
1214                 *ibits = MDS_INODELOCK_OPEN;
1215
1216                 /* never grant LCK_EX layout lock to client */
1217                 try_layout = false;
1218         } else { /* normal open */
1219                 /* normal open holds read mode of open sem */
1220                 down_read(&obj->mot_open_sem);
1221
1222                 if (open_flags & MDS_OPEN_LOCK) {
1223                         if (open_flags & FMODE_WRITE)
1224                                 lm = LCK_CW;
1225                         else if (open_flags & MDS_FMODE_EXEC)
1226                                 lm = LCK_PR;
1227                         else
1228                                 lm = LCK_CR;
1229
1230                         *ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_OPEN;
1231                 } else if (atomic_read(&obj->mot_lease_count) > 0) {
1232                         if (open_flags & FMODE_WRITE)
1233                                 lm = LCK_CW;
1234                         else
1235                                 lm = LCK_CR;
1236
1237                         /* revoke lease */
1238                         *ibits = MDS_INODELOCK_OPEN;
1239                         try_layout = false;
1240
1241                         lhc = &info->mti_lh[MDT_LH_LOCAL];
1242                 }
1243                 CDEBUG(D_INODE, "normal open:"DFID" lease count: %d, lm: %d\n",
1244                         PFID(mdt_object_fid(obj)),
1245                         atomic_read(&obj->mot_open_count), lm);
1246         }
1247
1248         mdt_lock_reg_init(lhc, lm);
1249
1250         /* one problem to return layout lock on open is that it may result
1251          * in too many layout locks cached on the client side. */
1252         if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_OPEN) && try_layout) {
1253                 /* return lookup lock to validate inode at the client side,
1254                  * this is pretty important otherwise mdt will return layout
1255                  * lock for each open.
1256                  * However this is a double-edged sword because changing
1257                  * permission will revoke huge # of LOOKUP locks. */
1258                 *ibits |= MDS_INODELOCK_LAYOUT | MDS_INODELOCK_LOOKUP;
1259                 if (!mdt_object_lock_try(info, obj, lhc, *ibits,
1260                                          MDT_CROSS_LOCK)) {
1261                         *ibits &= ~(MDS_INODELOCK_LAYOUT|MDS_INODELOCK_LOOKUP);
1262                         if (*ibits != 0)
1263                                 rc = mdt_object_lock(info, obj, lhc, *ibits,
1264                                                 MDT_CROSS_LOCK);
1265                 }
1266         } else if (*ibits != 0) {
1267                 rc = mdt_object_lock(info, obj, lhc, *ibits, MDT_CROSS_LOCK);
1268         }
1269
1270         CDEBUG(D_INODE, "Requested bits lock:"DFID ", ibits = "LPX64
1271                 ", open_flags = "LPO64", try_layout = %d, rc = %d\n",
1272                 PFID(mdt_object_fid(obj)), *ibits, open_flags, try_layout, rc);
1273
1274         /* will change layout, revoke layout locks by enqueuing EX lock. */
1275         if (rc == 0 && create_layout) {
1276                 struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LAYOUT];
1277
1278                 CDEBUG(D_INODE, "Will create layout, get EX layout lock:"DFID
1279                         ", open_flags = "LPO64"\n",
1280                         PFID(mdt_object_fid(obj)), open_flags);
1281
1282                 /* We cannot enqueue another lock for the same resource we
1283                  * already have a lock for, due to mechanics of waiting list
1284                  * iterating in ldlm, see LU-3601.
1285                  * As such we'll drop the open lock we just got above here,
1286                  * it's ok not to have this open lock as it's main purpose is to
1287                  * flush unused cached client open handles. */
1288                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
1289                         mdt_object_unlock(info, obj, lhc, 1);
1290
1291                 LASSERT(!try_layout);
1292                 mdt_lock_handle_init(ll);
1293                 mdt_lock_reg_init(ll, LCK_EX);
1294                 rc = mdt_object_lock(info, obj, ll, MDS_INODELOCK_LAYOUT,
1295                                         MDT_LOCAL_LOCK);
1296
1297                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_LL_BLOCK, 2);
1298         }
1299
1300         /* Check if there is any other open handles after acquiring
1301          * open lock. At this point, caching open handles have been revoked
1302          * by open lock.
1303          * XXX: Now only exclusive open is supported. Need to check the
1304          * type of open for generic lease support. */
1305         if (rc == 0 && acq_lease) {
1306                 struct ptlrpc_request *req = mdt_info_req(info);
1307                 struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
1308                 struct mdt_file_data *mfd;
1309                 bool is_replay_or_resent;
1310                 int open_count = 0;
1311
1312                 /* For lease: application can open a file and then apply lease,
1313                  * @handle contains original open handle in that case.
1314                  * In recovery, open REQ will be replayed and the lease REQ may
1315                  * be resent that means the open handle is already stale, so we
1316                  * need to fix it up here by finding new handle. */
1317                 is_replay_or_resent = req_is_replay(req) ||
1318                         lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT;
1319
1320                 /* if the request is _not_ a replay request, rr_handle
1321                  * may be used to hold an openhandle which is issuing the
1322                  * lease request, so that this openhandle doesn't count. */
1323                 mfd = mdt_handle2mfd(med, info->mti_rr.rr_handle,
1324                                      is_replay_or_resent);
1325                 if (mfd != NULL)
1326                         ++open_count;
1327
1328                 CDEBUG(D_INODE, "acq_lease "DFID": openers: %d, want: %d\n",
1329                         PFID(mdt_object_fid(obj)),
1330                         atomic_read(&obj->mot_open_count), open_count);
1331
1332                 if (atomic_read(&obj->mot_open_count) > open_count)
1333                         GOTO(out, rc = -EBUSY);
1334         }
1335         GOTO(out, rc);
1336
1337 out:
1338         RETURN(rc);
1339 }
1340
1341 static void mdt_object_open_unlock(struct mdt_thread_info *info,
1342                                    struct mdt_object *obj,
1343                                    struct mdt_lock_handle *lhc,
1344                                    __u64 ibits, int rc)
1345 {
1346         __u64 open_flags = info->mti_spec.sp_cr_flags;
1347         struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LOCAL];
1348         ENTRY;
1349
1350         if (req_is_replay(mdt_info_req(info)))
1351                 RETURN_EXIT;
1352
1353         /* Release local lock - the lock put in MDT_LH_LOCAL will never
1354          * return to client side. */
1355         if (lustre_handle_is_used(&ll->mlh_reg_lh))
1356                 mdt_object_unlock(info, obj, ll, 1);
1357
1358         ll = &info->mti_lh[MDT_LH_LAYOUT];
1359         /* Release local layout lock, layout was created */
1360         if (lustre_handle_is_used(&ll->mlh_reg_lh)) {
1361                 LASSERT(!(ibits & MDS_INODELOCK_LAYOUT));
1362                 mdt_object_unlock(info, obj, ll, 1);
1363         }
1364
1365         if (open_flags & MDS_OPEN_LEASE)
1366                 up_write(&obj->mot_open_sem);
1367         else
1368                 up_read(&obj->mot_open_sem);
1369
1370         /* Cross-ref case, the lock should be returned to the client */
1371         if (ibits == 0 || rc == -MDT_EREMOTE_OPEN)
1372                 RETURN_EXIT;
1373
1374         if (!(open_flags & MDS_OPEN_LOCK) && !(ibits & MDS_INODELOCK_LAYOUT)) {
1375                 /* for the open request, the lock will only return to client
1376                  * if open or layout lock is granted. */
1377                 rc = 1;
1378         }
1379
1380         if (rc != 0 || !lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1381                 struct ldlm_reply       *ldlm_rep;
1382
1383                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
1384                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1385                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
1386                         mdt_object_unlock(info, obj, lhc, 1);
1387         }
1388         RETURN_EXIT;
1389 }
1390
1391 /**
1392  * Check release is permitted for the current HSM flags.
1393  */
1394 static bool mdt_hsm_release_allow(const struct md_attr *ma)
1395 {
1396         if (!(ma->ma_valid & MA_HSM))
1397                 return false;
1398
1399         if (ma->ma_hsm.mh_flags & (HS_DIRTY|HS_NORELEASE|HS_LOST))
1400                 return false;
1401
1402         if (!(ma->ma_hsm.mh_flags & HS_ARCHIVED))
1403                 return false;
1404
1405         return true;
1406 }
1407
1408 int mdt_open_by_fid_lock(struct mdt_thread_info *info, struct ldlm_reply *rep,
1409                          struct mdt_lock_handle *lhc)
1410 {
1411         const struct lu_env     *env   = info->mti_env;
1412         struct mdt_device       *mdt   = info->mti_mdt;
1413         __u64                    flags = info->mti_spec.sp_cr_flags;
1414         struct mdt_reint_record *rr    = &info->mti_rr;
1415         struct md_attr          *ma    = &info->mti_attr;
1416         struct mdt_object       *parent= NULL;
1417         struct mdt_object       *o;
1418         int                      rc;
1419         int                      object_locked = 0;
1420         __u64                    ibits = 0;
1421         ENTRY;
1422
1423         if (md_should_create(flags) && !(flags & MDS_OPEN_HAS_EA)) {
1424                 if (!lu_fid_eq(rr->rr_fid1, rr->rr_fid2)) {
1425                         parent = mdt_object_find(env, mdt, rr->rr_fid1);
1426                         if (IS_ERR(parent)) {
1427                                 CDEBUG(D_INODE, "Fail to find parent "DFID
1428                                        " for anonymous created %ld, try to"
1429                                        " use server-side parent.\n",
1430                                        PFID(rr->rr_fid1), PTR_ERR(parent));
1431                                 parent = NULL;
1432                         }
1433                 }
1434                 if (parent == NULL)
1435                         ma->ma_need |= MA_PFID;
1436         }
1437
1438         o = mdt_object_find(env, mdt, rr->rr_fid2);
1439         if (IS_ERR(o))
1440                 GOTO(out_parent_put, rc = PTR_ERR(o));
1441
1442         if (mdt_object_remote(o)) {
1443                 CDEBUG(D_INFO, "%s: "DFID" is on remote MDT.\n",
1444                        mdt_obd_name(info->mti_mdt),
1445                        PFID(rr->rr_fid2));
1446                 GOTO(out, rc = -EREMOTE);
1447         } else if (!mdt_object_exists(o)) {
1448                 mdt_set_disposition(info, rep,
1449                                     DISP_IT_EXECD |
1450                                     DISP_LOOKUP_EXECD |
1451                                     DISP_LOOKUP_NEG);
1452                 GOTO(out, rc = -ENOENT);
1453         }
1454
1455         mdt_set_disposition(info, rep, (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1456
1457         mdt_prep_ma_buf_from_rep(info, o, ma);
1458         if (flags & MDS_OPEN_RELEASE)
1459                 ma->ma_need |= MA_HSM;
1460         rc = mdt_attr_get_complex(info, o, ma);
1461         if (rc)
1462                 GOTO(out, rc);
1463
1464         /* If a release request, check file flags are fine and ask for an
1465          * exclusive open access. */
1466         if (flags & MDS_OPEN_RELEASE && !mdt_hsm_release_allow(ma))
1467                 GOTO(out, rc = -EPERM);
1468
1469         rc = mdt_check_resent_lock(info, o, lhc);
1470         if (rc < 0) {
1471                 GOTO(out, rc);
1472         } else if (rc > 0) {
1473                 rc = mdt_object_open_lock(info, o, lhc, &ibits);
1474                 object_locked = 1;
1475                 if (rc)
1476                         GOTO(out_unlock, rc);
1477         }
1478
1479         if (ma->ma_valid & MA_PFID) {
1480                 parent = mdt_object_find(env, mdt, &ma->ma_pfid);
1481                 if (IS_ERR(parent)) {
1482                         CDEBUG(D_INODE, "Fail to find parent "DFID
1483                                " for anonymous created %ld, try to"
1484                                " use system default.\n",
1485                                PFID(&ma->ma_pfid), PTR_ERR(parent));
1486                         parent = NULL;
1487                 }
1488         }
1489
1490         rc = mdt_finish_open(info, parent, o, flags, 0, rep);
1491         if (!rc) {
1492                 mdt_set_disposition(info, rep, DISP_LOOKUP_POS);
1493                 if (flags & MDS_OPEN_LOCK)
1494                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
1495                 if (flags & MDS_OPEN_LEASE)
1496                         mdt_set_disposition(info, rep, DISP_OPEN_LEASE);
1497         }
1498         GOTO(out_unlock, rc);
1499
1500 out_unlock:
1501         if (object_locked)
1502                 mdt_object_open_unlock(info, o, lhc, ibits, rc);
1503 out:
1504         mdt_object_put(env, o);
1505 out_parent_put:
1506         if (parent != NULL)
1507                 mdt_object_put(env, parent);
1508         return rc;
1509 }
1510
1511 /* Cross-ref request. Currently it can only be a pure open (w/o create) */
1512 static int mdt_cross_open(struct mdt_thread_info *info,
1513                           const struct lu_fid *parent_fid,
1514                           const struct lu_fid *fid,
1515                           struct ldlm_reply *rep, __u32 flags)
1516 {
1517         struct md_attr    *ma = &info->mti_attr;
1518         struct mdt_object *o;
1519         int                rc;
1520         ENTRY;
1521
1522         o = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1523         if (IS_ERR(o))
1524                 RETURN(rc = PTR_ERR(o));
1525
1526         if (mdt_object_remote(o)) {
1527                 /* Something is wrong here, the object is on another MDS! */
1528                 CERROR("%s: "DFID" isn't on this server!: rc = %d\n",
1529                        mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1530                 LU_OBJECT_DEBUG(D_WARNING, info->mti_env,
1531                                 &o->mot_obj,
1532                                 "Object isn't on this server! FLD error?\n");
1533                 rc = -EFAULT;
1534         } else {
1535                 if (mdt_object_exists(o)) {
1536                         /* Do permission check for cross-open. */
1537                         rc = mo_permission(info->mti_env, NULL,
1538                                            mdt_object_child(o),
1539                                            NULL, flags | MDS_OPEN_CROSS);
1540                         if (rc)
1541                                 goto out;
1542
1543                         mdt_prep_ma_buf_from_rep(info, o, ma);
1544                         mdt_set_capainfo(info, 0, fid, BYPASS_CAPA);
1545                         rc = mdt_attr_get_complex(info, o, ma);
1546                         if (rc != 0)
1547                                 GOTO(out, rc);
1548
1549                         rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
1550                 } else {
1551                         /*
1552                          * Something is wrong here. lookup was positive but
1553                          * there is no object!
1554                          */
1555                         CERROR("%s: "DFID" doesn't exist!: rc = %d\n",
1556                               mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1557                         rc = -EFAULT;
1558                 }
1559         }
1560 out:
1561         mdt_object_put(info->mti_env, o);
1562         RETURN(rc);
1563 }
1564
1565 int mdt_reint_open(struct mdt_thread_info *info, struct mdt_lock_handle *lhc)
1566 {
1567         struct mdt_device       *mdt = info->mti_mdt;
1568         struct ptlrpc_request   *req = mdt_info_req(info);
1569         struct mdt_object       *parent;
1570         struct mdt_object       *child;
1571         struct mdt_lock_handle  *lh;
1572         struct ldlm_reply       *ldlm_rep;
1573         struct mdt_body         *repbody;
1574         struct lu_fid           *child_fid = &info->mti_tmp_fid1;
1575         struct md_attr          *ma = &info->mti_attr;
1576         __u64                    create_flags = info->mti_spec.sp_cr_flags;
1577         __u64                    ibits = 0;
1578         struct mdt_reint_record *rr = &info->mti_rr;
1579         int                      result, rc;
1580         int                      created = 0;
1581         int                      object_locked = 0;
1582         __u32                    msg_flags;
1583         ENTRY;
1584
1585         OBD_FAIL_TIMEOUT_ORSET(OBD_FAIL_MDS_PAUSE_OPEN, OBD_FAIL_ONCE,
1586                                (obd_timeout + 1) / 4);
1587
1588         mdt_counter_incr(req, LPROC_MDT_OPEN);
1589         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1590
1591         ma->ma_need = MA_INODE;
1592         ma->ma_valid = 0;
1593
1594         LASSERT(info->mti_pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
1595         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
1596
1597         if (unlikely(create_flags & MDS_OPEN_JOIN_FILE)) {
1598                 CERROR("file join is not supported anymore.\n");
1599                 GOTO(out, result = err_serious(-EOPNOTSUPP));
1600         }
1601         msg_flags = lustre_msg_get_flags(req->rq_reqmsg);
1602
1603         if ((create_flags & (MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS)) &&
1604             info->mti_spec.u.sp_ea.eadata == NULL)
1605                 GOTO(out, result = err_serious(-EINVAL));
1606
1607         CDEBUG(D_INODE, "I am going to open "DFID"/("DNAME"->"DFID") "
1608                "cr_flag="LPO64" mode=0%06o msg_flag=0x%x\n",
1609                PFID(rr->rr_fid1), PNAME(&rr->rr_name),
1610                PFID(rr->rr_fid2), create_flags,
1611                ma->ma_attr.la_mode, msg_flags);
1612
1613         if (info->mti_cross_ref) {
1614                 /* This is cross-ref open */
1615                 mdt_set_disposition(info, ldlm_rep,
1616                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD |
1617                              DISP_LOOKUP_POS));
1618                 result = mdt_cross_open(info, rr->rr_fid2, rr->rr_fid1,
1619                                         ldlm_rep, create_flags);
1620                 GOTO(out, result);
1621         } else if (req_is_replay(req) ||
1622             (req->rq_export->exp_libclient && create_flags & MDS_OPEN_HAS_EA)) {
1623                 /* This is a replay request or from liblustre with ea. */
1624                 result = mdt_open_by_fid(info, ldlm_rep);
1625
1626                 if (result != -ENOENT) {
1627                         if (req->rq_export->exp_libclient &&
1628                             create_flags & MDS_OPEN_HAS_EA)
1629                                 GOTO(out, result = 0);
1630                         GOTO(out, result);
1631                 }
1632                 /* We didn't find the correct object, so we need to re-create it
1633                  * via a regular replay. */
1634                 if (!(create_flags & MDS_OPEN_CREAT)) {
1635                         DEBUG_REQ(D_ERROR, req,
1636                                   "OPEN & CREAT not in open replay/by_fid.");
1637                         GOTO(out, result = -EFAULT);
1638                 }
1639                 CDEBUG(D_INFO, "No object(1), continue as regular open.\n");
1640         } else if (create_flags & (MDS_OPEN_BY_FID | MDS_OPEN_LOCK)) {
1641                 /*
1642                  * MDS_OPEN_LOCK is checked for backward compatibility with 2.1
1643                  * client.
1644                  */
1645                 result = mdt_open_by_fid_lock(info, ldlm_rep, lhc);
1646                 if (result < 0)
1647                         CDEBUG(D_INFO, "no object for "DFID": %d\n",
1648                                PFID(rr->rr_fid2), result);
1649                 GOTO(out, result);
1650         }
1651
1652         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK))
1653                 GOTO(out, result = err_serious(-ENOMEM));
1654
1655         mdt_set_disposition(info, ldlm_rep,
1656                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1657
1658         if (!lu_name_is_valid(&rr->rr_name))
1659                 GOTO(out, result = -EPROTO);
1660
1661         lh = &info->mti_lh[MDT_LH_PARENT];
1662         mdt_lock_pdo_init(lh,
1663                           (create_flags & MDS_OPEN_CREAT) ? LCK_PW : LCK_PR,
1664                           &rr->rr_name);
1665
1666         parent = mdt_object_find_lock(info, rr->rr_fid1, lh,
1667                                       MDS_INODELOCK_UPDATE);
1668         if (IS_ERR(parent))
1669                 GOTO(out, result = PTR_ERR(parent));
1670
1671         /* get and check version of parent */
1672         result = mdt_version_get_check(info, parent, 0);
1673         if (result)
1674                 GOTO(out_parent, result);
1675
1676         fid_zero(child_fid);
1677
1678         result = mdo_lookup(info->mti_env, mdt_object_child(parent),
1679                             &rr->rr_name, child_fid, &info->mti_spec);
1680
1681         LASSERTF(ergo(result == 0, fid_is_sane(child_fid)),
1682                  "looking for "DFID"/"DNAME", found FID = "DFID"\n",
1683                  PFID(mdt_object_fid(parent)), PNAME(&rr->rr_name),
1684                  PFID(child_fid));
1685
1686         if (result != 0 && result != -ENOENT && result != -ESTALE)
1687                 GOTO(out_parent, result);
1688
1689         if (result == -ENOENT || result == -ESTALE) {
1690                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1691                 if (result == -ESTALE) {
1692                         /*
1693                          * -ESTALE means the parent is a dead(unlinked) dir, so
1694                          * it should return -ENOENT to in accordance with the
1695                          * original mds implementaion.
1696                          */
1697                         GOTO(out_parent, result = -ENOENT);
1698                 }
1699                 if (!(create_flags & MDS_OPEN_CREAT))
1700                         GOTO(out_parent, result);
1701                 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
1702                         GOTO(out_parent, result = -EROFS);
1703                 *child_fid = *info->mti_rr.rr_fid2;
1704                 LASSERTF(fid_is_sane(child_fid), "fid="DFID"\n",
1705                          PFID(child_fid));
1706                 /* In the function below, .hs_keycmp resolves to
1707                  * lu_obj_hop_keycmp() */
1708                 /* coverity[overrun-buffer-val] */
1709                 child = mdt_object_new(info->mti_env, mdt, child_fid);
1710         } else {
1711                 /*
1712                  * Check for O_EXCL is moved to the mdt_finish_open(), we need to
1713                  * return FID back in that case.
1714                  */
1715                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1716                 child = mdt_object_find(info->mti_env, mdt, child_fid);
1717         }
1718         if (IS_ERR(child))
1719                 GOTO(out_parent, result = PTR_ERR(child));
1720
1721         /** check version of child  */
1722         rc = mdt_version_get_check(info, child, 1);
1723         if (rc)
1724                 GOTO(out_child, result = rc);
1725
1726         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1727         if (result == -ENOENT) {
1728                 /* Create under OBF and .lustre is not permitted */
1729                 if (!fid_is_md_operative(rr->rr_fid1))
1730                         GOTO(out_child, result = -EPERM);
1731
1732                 /* save versions in reply */
1733                 mdt_version_get_save(info, parent, 0);
1734                 mdt_version_get_save(info, child, 1);
1735
1736                 /* version of child will be changed */
1737                 tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(child));
1738
1739                 /* Not found and with MDS_OPEN_CREAT: let's create it. */
1740                 mdt_set_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1741
1742                 /* Let lower layers know what is lock mode on directory. */
1743                 info->mti_spec.sp_cr_mode =
1744                         mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
1745
1746                 /*
1747                  * Do not perform lookup sanity check. We know that name does
1748                  * not exist.
1749                  */
1750                 info->mti_spec.sp_cr_lookup = 0;
1751                 info->mti_spec.sp_feat = &dt_directory_features;
1752
1753                 result = mdo_create(info->mti_env,
1754                                     mdt_object_child(parent),
1755                                     &rr->rr_name,
1756                                     mdt_object_child(child),
1757                                     &info->mti_spec,
1758                                     &info->mti_attr);
1759                 if (result == -ERESTART) {
1760                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1761                         GOTO(out_child, result);
1762                 } else {
1763                         mdt_prep_ma_buf_from_rep(info, child, ma);
1764                         /* XXX: we should call this once, see few lines below */
1765                         if (result == 0)
1766                                 result = mdt_attr_get_complex(info, child, ma);
1767
1768                         if (result != 0)
1769                                 GOTO(out_child, result);
1770                 }
1771                 created = 1;
1772         } else {
1773                 /*
1774                  * The object is on remote node, return its FID for remote open.
1775                  */
1776                 if (mdt_object_remote(child)) {
1777                         /*
1778                          * Check if this lock already was sent to client and
1779                          * this is resent case. For resent case do not take lock
1780                          * again, use what is already granted.
1781                          */
1782                         LASSERT(lhc != NULL);
1783
1784                         rc = mdt_check_resent_lock(info, child, lhc);
1785                         if (rc < 0) {
1786                                 GOTO(out_child, result = rc);
1787                         } else if (rc > 0) {
1788                                 mdt_lock_handle_init(lhc);
1789                                 mdt_lock_reg_init(lhc, LCK_PR);
1790
1791                                 rc = mdt_object_lock(info, child, lhc,
1792                                                      MDS_INODELOCK_LOOKUP,
1793                                                      MDT_CROSS_LOCK);
1794                         }
1795                         repbody->mbo_fid1 = *mdt_object_fid(child);
1796                         repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
1797                         if (rc != 0)
1798                                 result = rc;
1799                         else
1800                                 result = -MDT_EREMOTE_OPEN;
1801                         GOTO(out_child, result);
1802                 } else if (mdt_object_exists(child)) {
1803                         /* We have to get attr & LOV EA & HSM for this
1804                          * object. */
1805                         mdt_prep_ma_buf_from_rep(info, child, ma);
1806                         ma->ma_need |= MA_HSM;
1807                         result = mdt_attr_get_complex(info, child, ma);
1808                         if (result != 0)
1809                                 GOTO(out_child, result);
1810                 } else {
1811                         /* Object does not exist. Likely FS corruption. */
1812                         CERROR("%s: name '"DNAME"' present, but FID "
1813                                DFID" is invalid\n", mdt_obd_name(info->mti_mdt),
1814                                PNAME(&rr->rr_name), PFID(child_fid));
1815                         GOTO(out_child, result = -EIO);
1816                 }
1817         }
1818
1819         rc = mdt_check_resent_lock(info, child, lhc);
1820         if (rc < 0) {
1821                 GOTO(out_child, result = rc);
1822         } else if (rc == 0) {
1823                 /* the open lock might already be gotten in
1824                  * ldlm_handle_enqueue() */
1825                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
1826                 if (create_flags & MDS_OPEN_LOCK)
1827                         mdt_set_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1828         } else {
1829                 /* get openlock if this isn't replay and client requested it */
1830                 if (!req_is_replay(req)) {
1831                         rc = mdt_object_open_lock(info, child, lhc, &ibits);
1832                         object_locked = 1;
1833                         if (rc != 0)
1834                                 GOTO(out_child_unlock, result = rc);
1835                         else if (create_flags & MDS_OPEN_LOCK)
1836                                 mdt_set_disposition(info, ldlm_rep,
1837                                                     DISP_OPEN_LOCK);
1838                 }
1839         }
1840         /* Try to open it now. */
1841         rc = mdt_finish_open(info, parent, child, create_flags,
1842                              created, ldlm_rep);
1843         if (rc) {
1844                 result = rc;
1845                 /* openlock will be released if mdt_finish_open failed */
1846                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1847
1848                 if (created && create_flags & MDS_OPEN_VOLATILE) {
1849                         CERROR("%s: cannot open volatile file "DFID", orphan "
1850                                "file will be left in PENDING directory until "
1851                                "next reboot, rc = %d\n", mdt_obd_name(mdt),
1852                                PFID(mdt_object_fid(child)), rc);
1853                         GOTO(out_child_unlock, result);
1854                 }
1855
1856                 if (created) {
1857                         ma->ma_need = 0;
1858                         ma->ma_valid = 0;
1859                         rc = mdo_unlink(info->mti_env,
1860                                         mdt_object_child(parent),
1861                                         mdt_object_child(child),
1862                                         &rr->rr_name,
1863                                         &info->mti_attr, 0);
1864                         if (rc != 0)
1865                                 CERROR("%s: "DFID" cleanup of open: rc = %d\n",
1866                                        mdt_obd_name(info->mti_mdt),
1867                                        PFID(mdt_object_fid(child)), rc);
1868                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1869                 }
1870         }
1871         EXIT;
1872 out_child_unlock:
1873         if (object_locked)
1874                 mdt_object_open_unlock(info, child, lhc, ibits, result);
1875 out_child:
1876         mdt_object_put(info->mti_env, child);
1877 out_parent:
1878         mdt_object_unlock_put(info, parent, lh, result || !created);
1879 out:
1880         if (result)
1881                 lustre_msg_set_transno(req->rq_repmsg, 0);
1882         return result;
1883 }
1884
1885 /**
1886  * Create an orphan object use local root.
1887  */
1888 static struct mdt_object *mdt_orphan_open(struct mdt_thread_info *info,
1889                                           struct mdt_device *mdt,
1890                                           const struct lu_fid *fid,
1891                                           struct md_attr *attr, fmode_t fmode)
1892 {
1893         const struct lu_env *env = info->mti_env;
1894         struct md_op_spec *spec = &info->mti_spec;
1895         struct lu_fid *local_root_fid = &info->mti_tmp_fid1;
1896         struct mdt_object *obj = NULL;
1897         struct mdt_object *local_root;
1898         static const struct lu_name lname = {
1899                 .ln_name = "i_am_nobody",
1900                 .ln_namelen = sizeof("i_am_nobody") - 1,
1901         };
1902         struct lu_ucred *uc;
1903         cfs_cap_t uc_cap_save;
1904         int rc;
1905         ENTRY;
1906
1907         rc = dt_root_get(env, mdt->mdt_bottom, local_root_fid);
1908         if (rc != 0)
1909                 RETURN(ERR_PTR(rc));
1910
1911         local_root = mdt_object_find(env, mdt, local_root_fid);
1912         if (IS_ERR(local_root))
1913                 RETURN(local_root);
1914
1915         obj = mdt_object_new(env, mdt, fid);
1916         if (IS_ERR(obj))
1917                 GOTO(out, rc = PTR_ERR(obj));
1918
1919         spec->sp_cr_lookup = 0;
1920         spec->sp_feat = &dt_directory_features;
1921         spec->sp_cr_mode = MDL_MINMODE; /* no lock */
1922         spec->sp_cr_flags = MDS_OPEN_VOLATILE | fmode;
1923         if (attr->ma_valid & MA_LOV) {
1924                 spec->u.sp_ea.eadata = attr->ma_lmm;
1925                 spec->u.sp_ea.eadatalen = attr->ma_lmm_size;
1926                 spec->sp_cr_flags |= MDS_OPEN_HAS_EA;
1927         } else {
1928                 spec->sp_cr_flags |= MDS_OPEN_DELAY_CREATE;
1929         }
1930
1931         uc = lu_ucred(env);
1932         uc_cap_save = uc->uc_cap;
1933         uc->uc_cap |= 1 << CFS_CAP_DAC_OVERRIDE;
1934         rc = mdo_create(env, mdt_object_child(local_root), &lname,
1935                         mdt_object_child(obj), spec, attr);
1936         uc->uc_cap = uc_cap_save;
1937         if (rc < 0) {
1938                 CERROR("%s: cannot create volatile file "DFID": rc = %d\n",
1939                        mdt_obd_name(mdt), PFID(fid), rc);
1940                 GOTO(out, rc);
1941         }
1942
1943         rc = mo_open(env, mdt_object_child(obj), MDS_OPEN_CREATED);
1944         if (rc < 0)
1945                 CERROR("%s: cannot open volatile file "DFID", orphan "
1946                        "file will be left in PENDING directory until "
1947                        "next reboot, rc = %d\n", mdt_obd_name(mdt),
1948                        PFID(fid), rc);
1949         GOTO(out, rc);
1950
1951 out:
1952         if (rc < 0) {
1953                 if (!IS_ERR(obj))
1954                         mdt_object_put(env, obj);
1955                 obj = ERR_PTR(rc);
1956         }
1957         mdt_object_put(env, local_root);
1958         return obj;
1959 }
1960
1961 static int mdt_hsm_release(struct mdt_thread_info *info, struct mdt_object *o,
1962                            struct md_attr *ma)
1963 {
1964         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LAYOUT];
1965         struct close_data      *data;
1966         struct ldlm_lock       *lease;
1967         struct mdt_object      *orphan;
1968         struct md_attr         *orp_ma;
1969         struct lu_buf          *buf;
1970         bool                    lease_broken;
1971         int                     rc;
1972         int                     rc2;
1973         ENTRY;
1974
1975         if (exp_connect_flags(info->mti_exp) & OBD_CONNECT_RDONLY)
1976                 RETURN(-EROFS);
1977
1978         data = req_capsule_client_get(info->mti_pill, &RMF_CLOSE_DATA);
1979         if (data == NULL)
1980                 RETURN(-EPROTO);
1981
1982         lease = ldlm_handle2lock(&data->cd_handle);
1983         if (lease == NULL)
1984                 RETURN(-ESTALE);
1985
1986         /* try to hold open_sem so that nobody else can open the file */
1987         if (!down_write_trylock(&o->mot_open_sem)) {
1988                 ldlm_lock_cancel(lease);
1989                 GOTO(out_reprocess, rc = -EBUSY);
1990         }
1991
1992         /* Check if the lease open lease has already canceled */
1993         lock_res_and_lock(lease);
1994         lease_broken = ldlm_is_cancel(lease);
1995         unlock_res_and_lock(lease);
1996
1997         LDLM_DEBUG(lease, DFID " lease broken? %d\n",
1998                    PFID(mdt_object_fid(o)), lease_broken);
1999
2000         /* Cancel server side lease. Client side counterpart should
2001          * have been cancelled. It's okay to cancel it now as we've
2002          * held mot_open_sem. */
2003         ldlm_lock_cancel(lease);
2004
2005         if (lease_broken) /* don't perform release task */
2006                 GOTO(out_unlock, rc = -ESTALE);
2007
2008         if (fid_is_zero(&data->cd_fid) || !fid_is_sane(&data->cd_fid))
2009                 GOTO(out_unlock, rc = -EINVAL);
2010
2011         /* ma_need was set before but it seems fine to change it in order to
2012          * avoid modifying the one from RPC */
2013         ma->ma_need = MA_HSM;
2014         rc = mdt_attr_get_complex(info, o, ma);
2015         if (rc != 0)
2016                 GOTO(out_unlock, rc);
2017
2018         if (!mdt_hsm_release_allow(ma))
2019                 GOTO(out_unlock, rc = -EPERM);
2020
2021         /* already released? */
2022         if (ma->ma_hsm.mh_flags & HS_RELEASED)
2023                 GOTO(out_unlock, rc = 0);
2024
2025         /* Compare on-disk and packed data_version */
2026         if (data->cd_data_version != ma->ma_hsm.mh_arch_ver) {
2027                 CDEBUG(D_HSM, DFID" data_version mismatches: packed="LPU64
2028                        " and on-disk="LPU64"\n", PFID(mdt_object_fid(o)),
2029                        data->cd_data_version, ma->ma_hsm.mh_arch_ver);
2030                 GOTO(out_unlock, rc = -EPERM);
2031         }
2032
2033         ma->ma_valid = MA_INODE;
2034         ma->ma_attr.la_valid &= LA_ATIME | LA_MTIME | LA_CTIME | LA_SIZE;
2035         rc = mo_attr_set(info->mti_env, mdt_object_child(o), ma);
2036         if (rc < 0)
2037                 GOTO(out_unlock, rc);
2038
2039         ma->ma_need = MA_INODE | MA_LOV;
2040         rc = mdt_attr_get_complex(info, o, ma);
2041         if (rc < 0)
2042                 GOTO(out_unlock, rc);
2043
2044         if (!(ma->ma_valid & MA_LOV)) {
2045                 /* Even empty file are released */
2046                 memset(ma->ma_lmm, 0, sizeof(*ma->ma_lmm));
2047                 ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1_DEF);
2048                 ma->ma_lmm->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
2049                 ma->ma_lmm->lmm_stripe_size = cpu_to_le32(LOV_MIN_STRIPE_SIZE);
2050                 ma->ma_lmm_size = sizeof(*ma->ma_lmm);
2051         } else {
2052                 /* Magic must be LOV_MAGIC_Vx_DEF otherwise LOD will interpret
2053                  * ma_lmm as lov_user_md, then it will be confused by union of
2054                  * layout_gen and stripe_offset. */
2055                 if (le32_to_cpu(ma->ma_lmm->lmm_magic) == LOV_MAGIC_V1)
2056                         ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1_DEF);
2057                 else if (le32_to_cpu(ma->ma_lmm->lmm_magic) == LOV_MAGIC_V3)
2058                         ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V3_DEF);
2059                 else
2060                         GOTO(out_unlock, rc = -EINVAL);
2061         }
2062
2063         /* Set file as released */
2064         ma->ma_lmm->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_RELEASED);
2065
2066         /* Hopefully it's not used in this call path */
2067         orp_ma = &info->mti_u.som.attr;
2068         orp_ma->ma_attr.la_mode = S_IFREG | S_IWUSR;
2069         orp_ma->ma_attr.la_uid = ma->ma_attr.la_uid;
2070         orp_ma->ma_attr.la_gid = ma->ma_attr.la_gid;
2071         orp_ma->ma_attr.la_valid = LA_MODE | LA_UID | LA_GID;
2072         orp_ma->ma_lmm = ma->ma_lmm;
2073         orp_ma->ma_lmm_size = ma->ma_lmm_size;
2074         orp_ma->ma_valid = MA_INODE | MA_LOV;
2075         orphan = mdt_orphan_open(info, info->mti_mdt, &data->cd_fid, orp_ma,
2076                                  FMODE_WRITE);
2077         if (IS_ERR(orphan)) {
2078                 CERROR("%s: cannot open orphan file "DFID": rc = %ld\n",
2079                        mdt_obd_name(info->mti_mdt), PFID(&data->cd_fid),
2080                        PTR_ERR(orphan));
2081                 GOTO(out_unlock, rc = PTR_ERR(orphan));
2082         }
2083
2084         /* Set up HSM attribute for orphan object */
2085         CLASSERT(sizeof(struct hsm_attrs) <= sizeof(info->mti_xattr_buf));
2086         buf = &info->mti_buf;
2087         buf->lb_buf = info->mti_xattr_buf;
2088         buf->lb_len = sizeof(struct hsm_attrs);
2089         ma->ma_hsm.mh_flags |= HS_RELEASED;
2090         lustre_hsm2buf(buf->lb_buf, &ma->ma_hsm);
2091         ma->ma_hsm.mh_flags &= ~HS_RELEASED;
2092
2093         mdt_lock_reg_init(lh, LCK_EX);
2094         rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_LAYOUT |
2095                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
2096         if (rc != 0)
2097                 GOTO(out_close, rc);
2098
2099         rc = mo_xattr_set(info->mti_env, mdt_object_child(orphan), buf,
2100                           XATTR_NAME_HSM, 0);
2101
2102         if (rc == 0)
2103                 /* Swap layout with orphan object */
2104                 rc = mo_swap_layouts(info->mti_env, mdt_object_child(o),
2105                                      mdt_object_child(orphan),
2106                                      SWAP_LAYOUTS_MDS_HSM);
2107
2108         /* Release exclusive LL */
2109         mdt_object_unlock(info, o, lh, 1);
2110
2111         EXIT;
2112
2113 out_close:
2114         /* Close orphan object anyway */
2115         rc2 = mo_close(info->mti_env, mdt_object_child(orphan), orp_ma,
2116                        FMODE_WRITE);
2117         if (rc2 < 0)
2118                 CERROR("%s: error closing volatile file "DFID": rc = %d\n",
2119                        mdt_obd_name(info->mti_mdt), PFID(&data->cd_fid), rc2);
2120         LU_OBJECT_DEBUG(D_HSM, info->mti_env, &orphan->mot_obj,
2121                         "object closed\n");
2122         mdt_object_put(info->mti_env, orphan);
2123
2124 out_unlock:
2125         up_write(&o->mot_open_sem);
2126
2127         if (rc == 0) { /* already released */
2128                 struct mdt_body *repbody;
2129                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
2130                 LASSERT(repbody != NULL);
2131                 repbody->mbo_valid |= OBD_MD_FLRELEASED;
2132         }
2133
2134 out_reprocess:
2135         ldlm_reprocess_all(lease->l_resource);
2136         LDLM_LOCK_PUT(lease);
2137
2138         ma->ma_valid = 0;
2139         ma->ma_need = 0;
2140
2141         return rc;
2142 }
2143
2144 #define MFD_CLOSED(mode) (((mode) & ~(MDS_FMODE_EPOCH | MDS_FMODE_SOM | \
2145                                       MDS_FMODE_TRUNC)) == MDS_FMODE_CLOSED)
2146
2147 static int mdt_mfd_closed(struct mdt_file_data *mfd)
2148 {
2149         return ((mfd == NULL) || MFD_CLOSED(mfd->mfd_mode));
2150 }
2151
2152 int mdt_mfd_close(struct mdt_thread_info *info, struct mdt_file_data *mfd)
2153 {
2154         struct mdt_object *o = mfd->mfd_object;
2155         struct md_object *next = mdt_object_child(o);
2156         struct md_attr *ma = &info->mti_attr;
2157         int ret = MDT_IOEPOCH_CLOSED;
2158         int rc = 0;
2159         __u64 mode;
2160         ENTRY;
2161
2162         mode = mfd->mfd_mode;
2163
2164         if (ma->ma_attr_flags & MDS_HSM_RELEASE) {
2165                 rc = mdt_hsm_release(info, o, ma);
2166                 if (rc < 0) {
2167                         CDEBUG(D_HSM, "%s: File " DFID " release failed: %d\n",
2168                                 mdt_obd_name(info->mti_mdt),
2169                                 PFID(mdt_object_fid(o)), rc);
2170                         /* continue to close even error occurred. */
2171                 }
2172         }
2173
2174         if ((mode & FMODE_WRITE) || (mode & MDS_FMODE_TRUNC)) {
2175                 mdt_write_put(o);
2176                 ret = mdt_ioepoch_close(info, o);
2177         } else if (mode & MDS_FMODE_EXEC) {
2178                 mdt_write_allow(o);
2179         } else if (mode & MDS_FMODE_EPOCH) {
2180                 ret = mdt_ioepoch_close(info, o);
2181         } else if (mode & MDS_FMODE_SOM) {
2182                 ret = mdt_som_au_close(info, o);
2183         }
2184
2185         /* Update atime on close only. */
2186         if ((mode & MDS_FMODE_EXEC || mode & FMODE_READ || mode & FMODE_WRITE)
2187             && (ma->ma_valid & MA_INODE) && (ma->ma_attr.la_valid & LA_ATIME)) {
2188                 /* Set the atime only. */
2189                 ma->ma_valid = MA_INODE;
2190                 ma->ma_attr.la_valid = LA_ATIME;
2191                 rc = mo_attr_set(info->mti_env, next, ma);
2192         }
2193
2194         /* If file data is modified, add the dirty flag. */
2195         if (ma->ma_attr_flags & MDS_DATA_MODIFIED)
2196                 rc = mdt_add_dirty_flag(info, o, ma);
2197
2198         ma->ma_need |= MA_INODE;
2199         ma->ma_valid &= ~MA_INODE;
2200
2201         if (!MFD_CLOSED(mode))
2202                 rc = mo_close(info->mti_env, next, ma, mode);
2203
2204         if (ret == MDT_IOEPOCH_GETATTR || ret == MDT_IOEPOCH_OPENED) {
2205                 struct mdt_export_data *med;
2206
2207                 /* The IOepoch is still opened or SOM update is needed.
2208                  * Put mfd back into the list. */
2209                 LASSERT(mdt_conn_flags(info) & OBD_CONNECT_SOM);
2210                 mdt_mfd_set_mode(mfd, ret == MDT_IOEPOCH_OPENED ?
2211                                       MDS_FMODE_EPOCH : MDS_FMODE_SOM);
2212
2213                 LASSERT(mdt_info_req(info));
2214                 med = &mdt_info_req(info)->rq_export->exp_mdt_data;
2215                 spin_lock(&med->med_open_lock);
2216                 list_add(&mfd->mfd_list, &med->med_open_head);
2217                 class_handle_hash_back(&mfd->mfd_handle);
2218                 spin_unlock(&med->med_open_lock);
2219
2220                 if (ret == MDT_IOEPOCH_OPENED) {
2221                         ret = 0;
2222                 } else {
2223                         ret = -EAGAIN;
2224                         CDEBUG(D_INODE, "Size-on-MDS attribute update is "
2225                                "needed on "DFID"\n", PFID(mdt_object_fid(o)));
2226                 }
2227         } else {
2228                 /* adjust open and lease count */
2229                 if (mode & MDS_OPEN_LEASE) {
2230                         LASSERT(atomic_read(&o->mot_lease_count) > 0);
2231                         atomic_dec(&o->mot_lease_count);
2232                 }
2233                 LASSERT(atomic_read(&o->mot_open_count) > 0);
2234                 atomic_dec(&o->mot_open_count);
2235
2236                 mdt_mfd_free(mfd);
2237                 mdt_object_put(info->mti_env, o);
2238         }
2239
2240         RETURN(rc ? rc : ret);
2241 }
2242
2243 int mdt_close(struct tgt_session_info *tsi)
2244 {
2245         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
2246         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2247         struct mdt_export_data *med;
2248         struct mdt_file_data   *mfd;
2249         struct mdt_object      *o;
2250         struct md_attr         *ma = &info->mti_attr;
2251         struct mdt_body        *repbody = NULL;
2252         int rc, ret = 0;
2253         ENTRY;
2254
2255         mdt_counter_incr(req, LPROC_MDT_CLOSE);
2256         /* Close may come with the Size-on-MDS update. Unpack it. */
2257         rc = mdt_close_unpack(info);
2258         if (rc)
2259                 GOTO(out, rc = err_serious(rc));
2260
2261         LASSERT(info->mti_ioepoch);
2262
2263         /* These fields are no longer used and are left for compatibility.
2264          * size is always zero */
2265         req_capsule_set_size(info->mti_pill, &RMF_MDT_MD, RCL_SERVER,
2266                              0);
2267         req_capsule_set_size(info->mti_pill, &RMF_LOGCOOKIES, RCL_SERVER,
2268                              0);
2269         rc = req_capsule_server_pack(info->mti_pill);
2270         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
2271                 mdt_client_compatibility(info);
2272                 if (rc == 0)
2273                         mdt_fix_reply(info);
2274                 mdt_exit_ucred(info);
2275                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
2276         }
2277
2278         /* Continue to close handle even if we can not pack reply */
2279         if (rc == 0) {
2280                 repbody = req_capsule_server_get(info->mti_pill,
2281                                                  &RMF_MDT_BODY);
2282                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
2283                                                     &RMF_MDT_MD);
2284                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
2285                                                        &RMF_MDT_MD,
2286                                                        RCL_SERVER);
2287                 ma->ma_need = MA_INODE | MA_LOV | MA_COOKIE;
2288                 repbody->mbo_eadatasize = 0;
2289                 repbody->mbo_aclsize = 0;
2290         } else {
2291                 rc = err_serious(rc);
2292         }
2293
2294         med = &req->rq_export->exp_mdt_data;
2295         spin_lock(&med->med_open_lock);
2296         mfd = mdt_handle2mfd(med, &info->mti_ioepoch->handle,
2297                              req_is_replay(req));
2298         if (mdt_mfd_closed(mfd)) {
2299                 spin_unlock(&med->med_open_lock);
2300                 CDEBUG(D_INODE, "no handle for file close: fid = "DFID
2301                        ": cookie = "LPX64"\n", PFID(info->mti_rr.rr_fid1),
2302                        info->mti_ioepoch->handle.cookie);
2303                 /** not serious error since bug 3633 */
2304                 rc = -ESTALE;
2305         } else {
2306                 class_handle_unhash(&mfd->mfd_handle);
2307                 list_del_init(&mfd->mfd_list);
2308                 spin_unlock(&med->med_open_lock);
2309
2310                 /* Do not lose object before last unlink. */
2311                 o = mfd->mfd_object;
2312                 mdt_object_get(info->mti_env, o);
2313                 ret = mdt_mfd_close(info, mfd);
2314                 if (repbody != NULL)
2315                         rc = mdt_handle_last_unlink(info, o, ma);
2316                 mdt_empty_transno(info, rc);
2317                 mdt_object_put(info->mti_env, o);
2318         }
2319         if (repbody != NULL) {
2320                 mdt_client_compatibility(info);
2321                 rc = mdt_fix_reply(info);
2322         }
2323
2324         mdt_exit_ucred(info);
2325         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK))
2326                 GOTO(out, rc = err_serious(-ENOMEM));
2327
2328         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_CLOSE_NET_REP,
2329                                  OBD_FAIL_MDS_CLOSE_NET_REP))
2330                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_CLOSE_NET_REP;
2331 out:
2332         mdt_thread_info_fini(info);
2333         RETURN(rc ? rc : ret);
2334 }
2335
2336 /**
2337  * DONE_WRITING rpc handler.
2338  *
2339  * As mfd is not kept after replayed CLOSE (see mdt_ioepoch_close_on_replay()),
2340  * only those DONE_WRITING rpc will be replayed which really wrote smth on disk,
2341  * and got a trasid. Waiting for such DONE_WRITING is not reliable, so just
2342  * skip attributes and reconstruct the reply here.
2343  */
2344 int mdt_done_writing(struct tgt_session_info *tsi)
2345 {
2346         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2347         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
2348         struct mdt_body         *repbody = NULL;
2349         struct mdt_export_data  *med;
2350         struct mdt_file_data    *mfd;
2351         int rc;
2352         ENTRY;
2353
2354         rc = req_capsule_server_pack(tsi->tsi_pill);
2355         if (rc)
2356                 GOTO(out, rc = err_serious(rc));
2357
2358         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
2359         repbody->mbo_eadatasize = 0;
2360         repbody->mbo_aclsize = 0;
2361
2362         /* Done Writing may come with the Size-on-MDS update. Unpack it. */
2363         rc = mdt_close_unpack(info);
2364         if (rc)
2365                 GOTO(out, rc = err_serious(rc));
2366
2367         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
2368                 mdt_exit_ucred(info);
2369                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
2370         }
2371
2372         med = &info->mti_exp->exp_mdt_data;
2373         spin_lock(&med->med_open_lock);
2374         mfd = mdt_handle2mfd(med, &info->mti_ioepoch->handle,
2375                              req_is_replay(req));
2376         if (mfd == NULL) {
2377                 spin_unlock(&med->med_open_lock);
2378                 CDEBUG(D_INODE, "no handle for done write: fid = "DFID
2379                        ": cookie = "LPX64" ioepoch = "LPU64"\n",
2380                        PFID(info->mti_rr.rr_fid1),
2381                        info->mti_ioepoch->handle.cookie,
2382                        info->mti_ioepoch->ioepoch);
2383                 /* If this is a replay, reconstruct the transno. */
2384                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
2385                         rc = info->mti_ioepoch->flags & MF_SOM_AU ?
2386                              -EAGAIN : 0;
2387                         mdt_empty_transno(info, rc);
2388                 } else
2389                         rc = -ESTALE;
2390                 GOTO(error_ucred, rc);
2391         }
2392
2393         LASSERT(mfd->mfd_mode == MDS_FMODE_EPOCH ||
2394                 mfd->mfd_mode == MDS_FMODE_TRUNC);
2395         class_handle_unhash(&mfd->mfd_handle);
2396         list_del_init(&mfd->mfd_list);
2397         spin_unlock(&med->med_open_lock);
2398
2399         /* Set EPOCH CLOSE flag if not set by client. */
2400         info->mti_ioepoch->flags |= MF_EPOCH_CLOSE;
2401         info->mti_attr.ma_valid = 0;
2402
2403         info->mti_attr.ma_lmm_size = info->mti_mdt->mdt_max_mdsize;
2404         OBD_ALLOC_LARGE(info->mti_attr.ma_lmm, info->mti_mdt->mdt_max_mdsize);
2405         if (info->mti_attr.ma_lmm == NULL)
2406                 GOTO(error_ucred, rc = -ENOMEM);
2407
2408         rc = mdt_mfd_close(info, mfd);
2409
2410         OBD_FREE_LARGE(info->mti_attr.ma_lmm, info->mti_mdt->mdt_max_mdsize);
2411         mdt_empty_transno(info, rc);
2412 error_ucred:
2413         mdt_exit_ucred(info);
2414 out:
2415         mdt_thread_info_fini(info);
2416         RETURN(rc);
2417 }