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, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * 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
  49 /* we do nothing because we do not have refcount now */
  50 static void mdt_mfd_get(void *mfdp)
  51 {
  52 }
  53
  54 static struct portals_handle_ops mfd_handle_ops = {
  55         .hop_addref = mdt_mfd_get,
  56         .hop_free   = NULL,
  57 };
  58
  59 /* Create a new mdt_file_data struct, initialize it,
  60  * and insert it to global hash table */
  61 struct mdt_file_data *mdt_mfd_new(const struct mdt_export_data *med)
  62 {
  63         struct mdt_file_data *mfd;
  64         ENTRY;
  65
  66         OBD_ALLOC_PTR(mfd);
  67         if (mfd != NULL) {
  68                 CFS_INIT_LIST_HEAD(&mfd->mfd_handle.h_link);
  69                 mfd->mfd_handle.h_owner = med;
  70                 CFS_INIT_LIST_HEAD(&mfd->mfd_list);
  71                 class_handle_hash(&mfd->mfd_handle, &mfd_handle_ops);
  72         }
  73
  74         RETURN(mfd);
  75 }
  76
  77 /*
  78  * Find the mfd pointed to by handle in global hash table.
  79  * In case of replay the handle is obsoleted
  80  * but mfd can be found in mfd list by that handle.
  81  * Callers need to be holding med_open_lock.
  82  */
  83 struct mdt_file_data *mdt_handle2mfd(struct mdt_export_data *med,
  84                                      const struct lustre_handle *handle,
  85                                      bool is_replay_or_resent)
  86 {
  87         struct mdt_file_data   *mfd;
  88         ENTRY;
  89
  90         LASSERT(handle != NULL);
  91         mfd = class_handle2object(handle->cookie, med);
  92         /* during dw/setattr replay the mfd can be found by old handle */
  93         if (mfd == NULL && is_replay_or_resent) {
  94                 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
  95                         if (mfd->mfd_old_handle.cookie == handle->cookie)
  96                                 RETURN(mfd);
  97                 }
  98                 mfd = NULL;
  99         }
 100
 101         RETURN(mfd);
 102 }
 103
 104 /* free mfd */
 105 void mdt_mfd_free(struct mdt_file_data *mfd)
 106 {
 107         LASSERT(cfs_list_empty(&mfd->mfd_list));
 108         OBD_FREE_RCU(mfd, sizeof *mfd, &mfd->mfd_handle);
 109 }
 110
 111 static int mdt_create_data(struct mdt_thread_info *info,
 112                            struct mdt_object *p, struct mdt_object *o)
 113 {
 114         struct md_op_spec     *spec = &info->mti_spec;
 115         struct md_attr        *ma   = &info->mti_attr;
 116         int                    rc   = 0;
 117         ENTRY;
 118
 119         if (!md_should_create(spec->sp_cr_flags))
 120                 RETURN(0);
 121
 122         ma->ma_need = MA_INODE | MA_LOV;
 123         ma->ma_valid = 0;
 124         mutex_lock(&o->mot_lov_mutex);
 125         if (!(o->mot_flags & MOF_LOV_CREATED)) {
 126                 if (p != NULL && (fid_is_obf(mdt_object_fid(p)) ||
 127                                   fid_is_dot_lustre(mdt_object_fid(p))))
 128                         GOTO(unlock, rc = -EPERM);
 129
 130                 rc = mdo_create_data(info->mti_env,
 131                                      p ? mdt_object_child(p) : NULL,
 132                                      mdt_object_child(o), spec, ma);
 133                 if (rc == 0)
 134                         rc = mdt_attr_get_complex(info, o, ma);
 135
 136                 if (rc == 0 && ma->ma_valid & MA_LOV)
 137                         o->mot_flags |= MOF_LOV_CREATED;
 138         }
 139 unlock:
 140         mutex_unlock(&o->mot_lov_mutex);
 141         RETURN(rc);
 142 }
 143
 144 static int mdt_ioepoch_opened(struct mdt_object *mo)
 145 {
 146         return mo->mot_ioepoch_count;
 147 }
 148
 149 int mdt_object_is_som_enabled(struct mdt_object *mo)
 150 {
 151         return !mo->mot_ioepoch;
 152 }
 153
 154 /**
 155  * Re-enable Size-on-MDS.
 156  * Call under ->mot_ioepoch_mutex.
 157  */
 158 static void mdt_object_som_enable(struct mdt_object *mo, __u64 ioepoch)
 159 {
 160         if (ioepoch == mo->mot_ioepoch) {
 161                 LASSERT(!mdt_ioepoch_opened(mo));
 162                 mo->mot_ioepoch = 0;
 163                 mo->mot_flags = 0;
 164         }
 165 }
 166
 167 /**
 168  * Open the IOEpoch. It is allowed if @writecount is not negative.
 169  * The epoch and writecount handling is performed under the mot_ioepoch_mutex.
 170  */
 171 int mdt_ioepoch_open(struct mdt_thread_info *info, struct mdt_object *o,
 172                      int created)
 173 {
 174         struct mdt_device *mdt = info->mti_mdt;
 175         int cancel = 0;
 176         int rc = 0;
 177         ENTRY;
 178
 179         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 180             !S_ISREG(lu_object_attr(&o->mot_obj)))
 181                 RETURN(0);
 182
 183         mutex_lock(&o->mot_ioepoch_mutex);
 184         if (mdt_ioepoch_opened(o)) {
 185                 /* Epoch continues even if there is no writers yet. */
 186                 CDEBUG(D_INODE, "continue epoch "LPU64" for "DFID"\n",
 187                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 188         } else {
 189                 /* XXX: ->mdt_ioepoch is not initialized at the mount */
 190                 spin_lock(&mdt->mdt_ioepoch_lock);
 191                 if (mdt->mdt_ioepoch < info->mti_replayepoch)
 192                         mdt->mdt_ioepoch = info->mti_replayepoch;
 193
 194                 if (info->mti_replayepoch)
 195                         o->mot_ioepoch = info->mti_replayepoch;
 196                 else if (++mdt->mdt_ioepoch == IOEPOCH_INVAL)
 197                         o->mot_ioepoch = ++mdt->mdt_ioepoch;
 198                 else
 199                         o->mot_ioepoch = mdt->mdt_ioepoch;
 200
 201                 spin_unlock(&mdt->mdt_ioepoch_lock);
 202
 203                 CDEBUG(D_INODE, "starting epoch "LPU64" for "DFID"\n",
 204                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 205                 if (created)
 206                         o->mot_flags |= MOF_SOM_CREATED;
 207                 cancel = 1;
 208         }
 209         o->mot_ioepoch_count++;
 210         mutex_unlock(&o->mot_ioepoch_mutex);
 211
 212         /* Cancel Size-on-MDS attributes cached on clients for the open case.
 213          * In the truncate case, see mdt_reint_setattr(). */
 214         if (cancel && (info->mti_rr.rr_fid1 != NULL)) {
 215                 struct mdt_lock_handle  *lh = &info->mti_lh[MDT_LH_CHILD];
 216                 mdt_lock_reg_init(lh, LCK_EX);
 217                 rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_UPDATE,
 218                                      MDT_LOCAL_LOCK);
 219                 if (rc == 0)
 220                         mdt_object_unlock(info, o, lh, 1);
 221         }
 222         RETURN(rc);
 223 }
 224
 225 /**
 226  * Update SOM on-disk attributes.
 227  * If enabling, write update inodes and lustre-ea with the proper IOEpoch,
 228  * mountid and attributes. If disabling, clean SOM xattr.
 229  * Call under ->mot_ioepoch_mutex.
 230  */
 231 static int mdt_som_attr_set(struct mdt_thread_info *info,
 232                             struct mdt_object *obj, __u64 ioepoch, bool enable)
 233 {
 234         struct md_object        *next = mdt_object_child(obj);
 235         int                      rc;
 236         ENTRY;
 237
 238         CDEBUG(D_INODE, "Size-on-MDS attribute %s for epoch "LPU64
 239                " on "DFID".\n", enable ? "update" : "disabling",
 240                ioepoch, PFID(mdt_object_fid(obj)));
 241
 242         if (enable) {
 243                 struct lu_buf           *buf = &info->mti_buf;
 244                 struct som_attrs        *attrs;
 245                 struct md_attr          *ma = &info->mti_attr;
 246                 struct lu_attr          *la = &ma->ma_attr;
 247                 struct obd_device       *obd = info->mti_mdt->mdt_lut.lut_obd;
 248
 249                 attrs = (struct som_attrs *)info->mti_xattr_buf;
 250                 CLASSERT(sizeof(info->mti_xattr_buf) >= sizeof(*attrs));
 251
 252                 /* pack SOM attributes */
 253                 memset(attrs, 0, sizeof(*attrs));
 254                 attrs->som_ioepoch = ioepoch;
 255                 attrs->som_mountid = obd->u.obt.obt_mount_count;
 256                 if ((la->la_valid & LA_SIZE) != 0)
 257                         attrs->som_size = la->la_size;
 258                 if ((la->la_valid & LA_BLOCKS) != 0)
 259                         attrs->som_blocks = la->la_blocks;
 260                 lustre_som_swab(attrs);
 261
 262                 /* update SOM attributes */
 263                 buf->lb_buf = attrs;
 264                 buf->lb_len = sizeof(*attrs);
 265                 rc = mo_xattr_set(info->mti_env, next, buf, XATTR_NAME_SOM, 0);
 266         } else {
 267                 /* delete SOM attributes */
 268                 rc = mo_xattr_del(info->mti_env, next, XATTR_NAME_SOM);
 269         }
 270
 271         RETURN(rc);
 272 }
 273
 274 /** Perform the eviction specific actions on ioepoch close. */
 275 static inline int mdt_ioepoch_close_on_eviction(struct mdt_thread_info *info,
 276                                                 struct mdt_object *o)
 277 {
 278         int rc = 0;
 279
 280         mutex_lock(&o->mot_ioepoch_mutex);
 281         CDEBUG(D_INODE, "Eviction. Closing IOepoch "LPU64" on "DFID". "
 282                "Count %d\n", o->mot_ioepoch, PFID(mdt_object_fid(o)),
 283                o->mot_ioepoch_count);
 284         o->mot_ioepoch_count--;
 285
 286         /* If eviction occured set MOF_SOM_RECOV,
 287          * if no other epoch holders, disable SOM on disk. */
 288         o->mot_flags |= MOF_SOM_CHANGE | MOF_SOM_RECOV;
 289         if (!mdt_ioepoch_opened(o)) {
 290                 rc = mdt_som_attr_set(info, o, o->mot_ioepoch, MDT_SOM_DISABLE);
 291                 mdt_object_som_enable(o, o->mot_ioepoch);
 292         }
 293         mutex_unlock(&o->mot_ioepoch_mutex);
 294         RETURN(rc);
 295 }
 296
 297 /**
 298  * Perform the replay specific actions on ioepoch close.
 299  * Skip SOM attribute update if obtained and just forget about the inode state
 300  * for the last ioepoch holder. The SOM cache is invalidated on MDS failure.
 301  */
 302 static inline int mdt_ioepoch_close_on_replay(struct mdt_thread_info *info,
 303                                               struct mdt_object *o)
 304 {
 305         int rc = MDT_IOEPOCH_CLOSED;
 306         ENTRY;
 307
 308         mutex_lock(&o->mot_ioepoch_mutex);
 309         CDEBUG(D_INODE, "Replay. Closing epoch "LPU64" on "DFID". Count %d\n",
 310                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 311         o->mot_ioepoch_count--;
 312
 313         /* Get an info from the replayed request if client is supposed
 314          * to send an Attibute Update, reconstruct @rc if so */
 315         if (info->mti_ioepoch->flags & MF_SOM_AU)
 316                 rc = MDT_IOEPOCH_GETATTR;
 317
 318         if (!mdt_ioepoch_opened(o))
 319                 mdt_object_som_enable(o, info->mti_ioepoch->ioepoch);
 320         mutex_unlock(&o->mot_ioepoch_mutex);
 321
 322         RETURN(rc);
 323 }
 324
 325 /**
 326  * Regular file IOepoch close.
 327  * Closes the ioepoch, checks the object state, apply obtained attributes and
 328  * re-enable SOM on the object, if possible. Also checks if the recovery is
 329  * needed and packs OBD_MD_FLGETATTRLOCK flag into the reply to force the client
 330  * to obtain SOM attributes under the server-side OST locks.
 331  *
 332  * Return value:
 333  * MDT_IOEPOCH_CLOSED if ioepoch is closed.
 334  * MDT_IOEPOCH_GETATTR if ioepoch is closed but another SOM update is needed.
 335  */
 336 static inline int mdt_ioepoch_close_reg(struct mdt_thread_info *info,
 337                                         struct mdt_object *o)
 338 {
 339         struct md_attr *tmp_ma;
 340         struct lu_attr *la;
 341         int achange, opened;
 342         int recovery = 0;
 343         int rc = 0, ret = MDT_IOEPOCH_CLOSED;
 344         ENTRY;
 345
 346         la = &info->mti_attr.ma_attr;
 347         achange = (info->mti_ioepoch->flags & MF_SOM_CHANGE);
 348
 349         mutex_lock(&o->mot_ioepoch_mutex);
 350         o->mot_ioepoch_count--;
 351
 352         tmp_ma = &info->mti_u.som.attr;
 353         tmp_ma->ma_lmm = info->mti_attr.ma_lmm;
 354         tmp_ma->ma_lmm_size = info->mti_attr.ma_lmm_size;
 355         tmp_ma->ma_som = &info->mti_u.som.data;
 356         tmp_ma->ma_need = MA_INODE | MA_LOV | MA_SOM;
 357         tmp_ma->ma_valid = 0;
 358         rc = mdt_attr_get_complex(info, o, tmp_ma);
 359         if (rc)
 360                 GOTO(error_up, rc);
 361
 362         /* Check the on-disk SOM state. */
 363         if (o->mot_flags & MOF_SOM_RECOV)
 364                 recovery = 1;
 365         else if (!(o->mot_flags & MOF_SOM_CREATED) &&
 366                  !(tmp_ma->ma_valid & MA_SOM))
 367                 recovery = 1;
 368
 369         CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
 370                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 371
 372         opened = mdt_ioepoch_opened(o);
 373         /**
 374          * If IOEpoch is not opened, check if a Size-on-MDS update is needed.
 375          * Skip the check for file with no LOV  or for unlink files.
 376          */
 377         if (!opened && tmp_ma->ma_valid & MA_LOV &&
 378             !(tmp_ma->ma_valid & MA_INODE && tmp_ma->ma_attr.la_nlink == 0)) {
 379                 if (recovery)
 380                         /* If some previous writer was evicted, re-ask the
 381                          * client for attributes. Even if attributes are
 382                          * provided, we cannot believe in them.
 383                          * Another use case is that there is no SOM cache on
 384                          * disk -- first access with SOM or there was an MDS
 385                          * failure. */
 386                         ret = MDT_IOEPOCH_GETATTR;
 387                 else if (o->mot_flags & MOF_SOM_CHANGE)
 388                         /* Some previous writer changed the attribute.
 389                          * Do not believe to the current Size-on-MDS
 390                          * update, re-ask client. */
 391                         ret = MDT_IOEPOCH_GETATTR;
 392                 else if (!(la->la_valid & LA_SIZE) && achange)
 393                         /* Attributes were changed by the last writer
 394                          * only but no Size-on-MDS update is received.*/
 395                         ret = MDT_IOEPOCH_GETATTR;
 396         }
 397
 398         if (achange || ret == MDT_IOEPOCH_GETATTR)
 399                 o->mot_flags |= MOF_SOM_CHANGE;
 400
 401         /* If epoch ends and relable SOM attributes are obtained, update them.
 402          * Create SOM ea for new files even if there is no attributes obtained
 403          * (0-length file). */
 404         if (ret == MDT_IOEPOCH_CLOSED && !opened) {
 405                 if (achange || o->mot_flags & MOF_SOM_CREATED) {
 406                         LASSERT(achange || !(la->la_valid & LA_SIZE));
 407                         rc = mdt_som_attr_set(info, o, o->mot_ioepoch,
 408                                               MDT_SOM_ENABLE);
 409                         /* Avoid the following setattrs of these attributes,
 410                          * e.g. for atime update. */
 411                         info->mti_attr.ma_valid = 0;
 412                 }
 413                 mdt_object_som_enable(o, o->mot_ioepoch);
 414         }
 415
 416         mutex_unlock(&o->mot_ioepoch_mutex);
 417         /* If recovery is needed, tell the client to perform GETATTR under
 418          * the lock. */
 419         if (ret == MDT_IOEPOCH_GETATTR && recovery) {
 420                 struct mdt_body *rep;
 421                 rep = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 422                 rep->valid |= OBD_MD_FLGETATTRLOCK;
 423         }
 424
 425         RETURN(rc ? : ret);
 426
 427 error_up:
 428         mutex_unlock(&o->mot_ioepoch_mutex);
 429         return rc;
 430 }
 431
 432 /**
 433  * Close IOEpoch (opened file or MDS_FMODE_EPOCH state). It happens if:
 434  * - a client closes the IOEpoch;
 435  * - a client eviction occured.
 436  * Return values:
 437  * MDT_IOEPOCH_OPENED if the client does not close IOEpoch.
 438  * MDT_IOEPOCH_CLOSED if the client closes IOEpoch.
 439  * MDT_IOEPOCH_GETATTR if the client closes IOEpoch but another SOM attribute
 440  * update is needed.
 441  */
 442 static int mdt_ioepoch_close(struct mdt_thread_info *info, struct mdt_object *o)
 443 {
 444         struct ptlrpc_request *req = mdt_info_req(info);
 445         ENTRY;
 446
 447         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 448             !S_ISREG(lu_object_attr(&o->mot_obj)))
 449                 RETURN(0);
 450
 451         LASSERT(o->mot_ioepoch_count);
 452         LASSERT(info->mti_ioepoch == NULL ||
 453                 info->mti_ioepoch->ioepoch == o->mot_ioepoch);
 454
 455         /* IOEpoch is closed only if client tells about it or eviction occures.
 456          * In the replay case, always close the epoch. */
 457         if (req == NULL)
 458                 RETURN(mdt_ioepoch_close_on_eviction(info, o));
 459         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
 460                 RETURN(mdt_ioepoch_close_on_replay(info, o));
 461         if (info->mti_ioepoch && (info->mti_ioepoch->flags & MF_EPOCH_CLOSE))
 462                 RETURN(mdt_ioepoch_close_reg(info, o));
 463         /* IO epoch is not closed. */
 464         RETURN(MDT_IOEPOCH_OPENED);
 465 }
 466
 467 /**
 468  * Close MDS_FMODE_SOM state, when IOEpoch is already closed and we are waiting
 469  * for attribute update. It happens if:
 470  * - SOM Attribute Update is obtained;
 471  * - the client failed to obtain it and informs MDS about it;
 472  * - a client eviction occured.
 473  * Apply obtained attributes for the 1st case, wipe out the on-disk SOM
 474  * cache otherwise.
 475  */
 476 int mdt_som_au_close(struct mdt_thread_info *info, struct mdt_object *o)
 477 {
 478         struct ptlrpc_request   *req = mdt_info_req(info);
 479         __u64                    ioepoch = 0;
 480         int                      act = MDT_SOM_ENABLE;
 481         int                      rc = 0;
 482         ENTRY;
 483
 484         LASSERT(!req || info->mti_ioepoch);
 485         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 486             !S_ISREG(lu_object_attr(&o->mot_obj)))
 487                 RETURN(0);
 488
 489         /* No size whereas MF_SOM_CHANGE is set means client failed to
 490          * obtain ost attributes, drop the SOM cache on disk if so. */
 491         if (!req ||
 492             (info->mti_ioepoch &&
 493              info->mti_ioepoch->flags & MF_SOM_CHANGE &&
 494              !(info->mti_attr.ma_attr.la_valid & LA_SIZE)))
 495                 act = MDT_SOM_DISABLE;
 496
 497         mutex_lock(&o->mot_ioepoch_mutex);
 498         /* Mark the object it is the recovery state if we failed to obtain
 499          * SOM attributes. */
 500         if (act == MDT_SOM_DISABLE)
 501                 o->mot_flags |= MOF_SOM_RECOV;
 502
 503         if (!mdt_ioepoch_opened(o)) {
 504                 ioepoch =  info->mti_ioepoch ?
 505                         info->mti_ioepoch->ioepoch : o->mot_ioepoch;
 506
 507                 if (req != NULL
 508                     && !(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 509                         rc = mdt_som_attr_set(info, o, ioepoch, act);
 510                 mdt_object_som_enable(o, ioepoch);
 511         }
 512         mutex_unlock(&o->mot_ioepoch_mutex);
 513         RETURN(rc);
 514 }
 515
 516 int mdt_write_read(struct mdt_object *o)
 517 {
 518         int rc = 0;
 519         ENTRY;
 520         mutex_lock(&o->mot_ioepoch_mutex);
 521         rc = o->mot_writecount;
 522         mutex_unlock(&o->mot_ioepoch_mutex);
 523         RETURN(rc);
 524 }
 525
 526 int mdt_write_get(struct mdt_object *o)
 527 {
 528         int rc = 0;
 529         ENTRY;
 530         mutex_lock(&o->mot_ioepoch_mutex);
 531         if (o->mot_writecount < 0)
 532                 rc = -ETXTBSY;
 533         else
 534                 o->mot_writecount++;
 535         mutex_unlock(&o->mot_ioepoch_mutex);
 536         RETURN(rc);
 537 }
 538
 539 void mdt_write_put(struct mdt_object *o)
 540 {
 541         ENTRY;
 542         mutex_lock(&o->mot_ioepoch_mutex);
 543         o->mot_writecount--;
 544         mutex_unlock(&o->mot_ioepoch_mutex);
 545         EXIT;
 546 }
 547
 548 static int mdt_write_deny(struct mdt_object *o)
 549 {
 550         int rc = 0;
 551         ENTRY;
 552         mutex_lock(&o->mot_ioepoch_mutex);
 553         if (o->mot_writecount > 0)
 554                 rc = -ETXTBSY;
 555         else
 556                 o->mot_writecount--;
 557         mutex_unlock(&o->mot_ioepoch_mutex);
 558         RETURN(rc);
 559 }
 560
 561 static void mdt_write_allow(struct mdt_object *o)
 562 {
 563         ENTRY;
 564         mutex_lock(&o->mot_ioepoch_mutex);
 565         o->mot_writecount++;
 566         mutex_unlock(&o->mot_ioepoch_mutex);
 567         EXIT;
 568 }
 569
 570 /* there can be no real transaction so prepare the fake one */
 571 static void mdt_empty_transno(struct mdt_thread_info *info, int rc)
 572 {
 573         struct mdt_device      *mdt = info->mti_mdt;
 574         struct ptlrpc_request  *req = mdt_info_req(info);
 575         struct tg_export_data  *ted;
 576         struct lsd_client_data *lcd;
 577
 578         ENTRY;
 579         /* transaction has occurred already */
 580         if (lustre_msg_get_transno(req->rq_repmsg) != 0)
 581                 RETURN_EXIT;
 582
 583         spin_lock(&mdt->mdt_lut.lut_translock);
 584         if (rc != 0) {
 585                 if (info->mti_transno != 0) {
 586                         struct obd_export *exp = req->rq_export;
 587
 588                         CERROR("%s: replay trans "LPU64" NID %s: rc = %d\n",
 589                                mdt_obd_name(mdt), info->mti_transno,
 590                                libcfs_nid2str(exp->exp_connection->c_peer.nid),
 591                                rc);
 592                         spin_unlock(&mdt->mdt_lut.lut_translock);
 593                         RETURN_EXIT;
 594                 }
 595         } else if (info->mti_transno == 0) {
 596                 info->mti_transno = ++mdt->mdt_lut.lut_last_transno;
 597         } else {
 598                 /* should be replay */
 599                 if (info->mti_transno > mdt->mdt_lut.lut_last_transno)
 600                         mdt->mdt_lut.lut_last_transno = info->mti_transno;
 601         }
 602         spin_unlock(&mdt->mdt_lut.lut_translock);
 603
 604         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 605                info->mti_transno,
 606                req->rq_export->exp_obd->obd_last_committed);
 607
 608         req->rq_transno = info->mti_transno;
 609         lustre_msg_set_transno(req->rq_repmsg, info->mti_transno);
 610
 611         /* update lcd in memory only for resent cases */
 612         ted = &req->rq_export->exp_target_data;
 613         LASSERT(ted);
 614         mutex_lock(&ted->ted_lcd_lock);
 615         lcd = ted->ted_lcd;
 616         if (info->mti_transno < lcd->lcd_last_transno &&
 617             info->mti_transno != 0) {
 618                 /* This should happen during replay. Do not update
 619                  * last rcvd info if replay req transno < last transno,
 620                  * otherwise the following resend(after replay) can not
 621                  * be checked correctly by xid */
 622                 mutex_unlock(&ted->ted_lcd_lock);
 623                 CDEBUG(D_HA, "%s: transno = "LPU64" < last_transno = "LPU64"\n",
 624                        mdt_obd_name(mdt), info->mti_transno,
 625                        lcd->lcd_last_transno);
 626                 RETURN_EXIT;
 627         }
 628
 629         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 630             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 631                 if (info->mti_transno != 0)
 632                         lcd->lcd_last_close_transno = info->mti_transno;
 633                 lcd->lcd_last_close_xid = req->rq_xid;
 634                 lcd->lcd_last_close_result = rc;
 635         } else {
 636                 /* VBR: save versions in last_rcvd for reconstruct. */
 637                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 638                 if (pre_versions) {
 639                         lcd->lcd_pre_versions[0] = pre_versions[0];
 640                         lcd->lcd_pre_versions[1] = pre_versions[1];
 641                         lcd->lcd_pre_versions[2] = pre_versions[2];
 642                         lcd->lcd_pre_versions[3] = pre_versions[3];
 643                 }
 644                 if (info->mti_transno != 0)
 645                         lcd->lcd_last_transno = info->mti_transno;
 646
 647                 lcd->lcd_last_xid = req->rq_xid;
 648                 lcd->lcd_last_result = rc;
 649                 lcd->lcd_last_data = info->mti_opdata;
 650         }
 651         mutex_unlock(&ted->ted_lcd_lock);
 652
 653         EXIT;
 654 }
 655
 656 void mdt_mfd_set_mode(struct mdt_file_data *mfd, __u64 mode)
 657 {
 658         LASSERT(mfd != NULL);
 659
 660         CDEBUG(D_HA, DFID " Change mfd mode "LPO64" -> "LPO64".\n",
 661                PFID(mdt_object_fid(mfd->mfd_object)), mfd->mfd_mode, mode);
 662
 663         mfd->mfd_mode = mode;
 664 }
 665
 666 static int mdt_mfd_open(struct mdt_thread_info *info, struct mdt_object *p,
 667                         struct mdt_object *o, __u64 flags, int created,
 668                         struct ldlm_reply *rep)
 669 {
 670         struct ptlrpc_request   *req = mdt_info_req(info);
 671         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 672         struct mdt_file_data    *mfd;
 673         struct md_attr          *ma  = &info->mti_attr;
 674         struct lu_attr          *la  = &ma->ma_attr;
 675         struct mdt_body         *repbody;
 676         int                      rc = 0, isdir, isreg;
 677         ENTRY;
 678
 679         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 680
 681         isreg = S_ISREG(la->la_mode);
 682         isdir = S_ISDIR(la->la_mode);
 683         if (isreg && !(ma->ma_valid & MA_LOV) && !(flags & MDS_OPEN_RELEASE)) {
 684                 /*
 685                  * No EA, check whether it is will set regEA and dirEA since in
 686                  * above attr get, these size might be zero, so reset it, to
 687                  * retrieve the MD after create obj.
 688                  */
 689                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 690                                                        &RMF_MDT_MD,
 691                                                        RCL_SERVER);
 692                 /* in replay case, p == NULL */
 693                 rc = mdt_create_data(info, p, o);
 694                 if (rc)
 695                         RETURN(rc);
 696
 697                 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_DISP_STRIPE)
 698                         mdt_set_disposition(info, rep, DISP_OPEN_STRIPE);
 699         }
 700
 701         CDEBUG(D_INODE, "after open, ma_valid bit = "LPX64" lmm_size = %d\n",
 702                ma->ma_valid, ma->ma_lmm_size);
 703
 704         if (ma->ma_valid & MA_LOV) {
 705                 LASSERT(ma->ma_lmm_size != 0);
 706                 repbody->eadatasize = ma->ma_lmm_size;
 707                 if (isdir)
 708                         repbody->valid |= OBD_MD_FLDIREA;
 709                 else
 710                         repbody->valid |= OBD_MD_FLEASIZE;
 711         }
 712
 713         if (flags & FMODE_WRITE) {
 714                 rc = mdt_write_get(o);
 715                 if (rc == 0) {
 716                         mdt_ioepoch_open(info, o, created);
 717                         repbody->ioepoch = o->mot_ioepoch;
 718                 }
 719         } else if (flags & MDS_FMODE_EXEC) {
 720                 rc = mdt_write_deny(o);
 721         }
 722         if (rc)
 723                 RETURN(rc);
 724
 725         rc = mo_open(info->mti_env, mdt_object_child(o),
 726                      created ? flags | MDS_OPEN_CREATED : flags);
 727         if (rc)
 728                 GOTO(err_out, rc);
 729
 730         mfd = mdt_mfd_new(med);
 731         if (mfd == NULL)
 732                 GOTO(err_out, rc = -ENOMEM);
 733
 734         /*
 735          * Keep a reference on this object for this open, and is
 736          * released by mdt_mfd_close().
 737          */
 738         mdt_object_get(info->mti_env, o);
 739         mfd->mfd_object = o;
 740         mfd->mfd_xid = req->rq_xid;
 741
 742         /*
 743          * @flags is always not zero. At least it should be FMODE_READ,
 744          * FMODE_WRITE or MDS_FMODE_EXEC.
 745          */
 746         LASSERT(flags != 0);
 747
 748         /* Open handling. */
 749         mdt_mfd_set_mode(mfd, flags);
 750
 751         atomic_inc(&o->mot_open_count);
 752         if (flags & MDS_OPEN_LEASE)
 753                 atomic_inc(&o->mot_lease_count);
 754
 755         /* replay handle */
 756         if (req_is_replay(req)) {
 757                 struct mdt_file_data *old_mfd;
 758                 /* Check wheather old cookie already exist in
 759                  * the list, becasue when do recovery, client
 760                  * might be disconnected from server, and
 761                  * restart replay, so there maybe some orphan
 762                  * mfd here, we should remove them */
 763                 LASSERT(info->mti_rr.rr_handle != NULL);
 764                 spin_lock(&med->med_open_lock);
 765                 old_mfd = mdt_handle2mfd(med, info->mti_rr.rr_handle, true);
 766                 if (old_mfd != NULL) {
 767                         CDEBUG(D_HA, "delete orphan mfd = %p, fid = "DFID", "
 768                                "cookie = "LPX64"\n", mfd,
 769                                PFID(mdt_object_fid(mfd->mfd_object)),
 770                                info->mti_rr.rr_handle->cookie);
 771                         class_handle_unhash(&old_mfd->mfd_handle);
 772                         cfs_list_del_init(&old_mfd->mfd_list);
 773                         spin_unlock(&med->med_open_lock);
 774                         /* no attr update for that close */
 775                         la->la_valid = 0;
 776                         ma->ma_valid |= MA_FLAGS;
 777                         ma->ma_attr_flags |= MDS_RECOV_OPEN;
 778                         mdt_mfd_close(info, old_mfd);
 779                         ma->ma_attr_flags &= ~MDS_RECOV_OPEN;
 780                         ma->ma_valid &= ~MA_FLAGS;
 781                 } else {
 782                         spin_unlock(&med->med_open_lock);
 783                         CDEBUG(D_HA, "orphan mfd not found, fid = "DFID", "
 784                                "cookie = "LPX64"\n",
 785                                PFID(mdt_object_fid(mfd->mfd_object)),
 786                                info->mti_rr.rr_handle->cookie);
 787                 }
 788
 789                 CDEBUG(D_HA, "Store old cookie "LPX64" in new mfd\n",
 790                        info->mti_rr.rr_handle->cookie);
 791
 792                 mfd->mfd_old_handle.cookie = info->mti_rr.rr_handle->cookie;
 793         }
 794
 795         repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 796
 797         if (req->rq_export->exp_disconnected) {
 798                 spin_lock(&med->med_open_lock);
 799                 class_handle_unhash(&mfd->mfd_handle);
 800                 cfs_list_del_init(&mfd->mfd_list);
 801                 spin_unlock(&med->med_open_lock);
 802                 mdt_mfd_close(info, mfd);
 803         } else {
 804                 spin_lock(&med->med_open_lock);
 805                 cfs_list_add(&mfd->mfd_list, &med->med_open_head);
 806                 spin_unlock(&med->med_open_lock);
 807         }
 808
 809         mdt_empty_transno(info, rc);
 810
 811         RETURN(rc);
 812
 813 err_out:
 814         if (flags & FMODE_WRITE)
 815                 /* XXX We also need to close io epoch here.
 816                  * See LU-1220 - green */
 817                 mdt_write_put(o);
 818         else if (flags & MDS_FMODE_EXEC)
 819                 mdt_write_allow(o);
 820
 821         return rc;
 822 }
 823
 824 int mdt_finish_open(struct mdt_thread_info *info,
 825                     struct mdt_object *p, struct mdt_object *o,
 826                     __u64 flags, int created, struct ldlm_reply *rep)
 827 {
 828         struct ptlrpc_request   *req = mdt_info_req(info);
 829         struct obd_export       *exp = req->rq_export;
 830         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 831         struct md_attr          *ma  = &info->mti_attr;
 832         struct lu_attr          *la  = &ma->ma_attr;
 833         struct mdt_file_data    *mfd;
 834         struct mdt_body         *repbody;
 835         int                      rc = 0;
 836         int                      isreg, isdir, islnk;
 837         cfs_list_t              *t;
 838         ENTRY;
 839
 840         LASSERT(ma->ma_valid & MA_INODE);
 841
 842         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 843
 844         isreg = S_ISREG(la->la_mode);
 845         isdir = S_ISDIR(la->la_mode);
 846         islnk = S_ISLNK(la->la_mode);
 847         mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 848
 849         /* LU-2275, simulate broken behaviour (esp. prevalent in
 850          * pre-2.4 servers where a very strange reply is sent on error
 851          * that looks like it was actually almost succesful and a failure at the
 852          * same time */
 853         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_NEGATIVE_POSITIVE)) {
 854                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN |
 855                                                DISP_LOOKUP_NEG |
 856                                                DISP_LOOKUP_POS);
 857
 858                 if (flags & MDS_OPEN_LOCK)
 859                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
 860
 861                 RETURN(-ENOENT);
 862         }
 863
 864         if (exp_connect_rmtclient(exp)) {
 865                 void *buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 866
 867                 rc = mdt_pack_remote_perm(info, o, buf);
 868                 if (rc) {
 869                         repbody->valid &= ~OBD_MD_FLRMTPERM;
 870                         repbody->aclsize = 0;
 871                 } else {
 872                         repbody->valid |= OBD_MD_FLRMTPERM;
 873                         repbody->aclsize = sizeof(struct mdt_remote_perm);
 874                 }
 875         }
 876 #ifdef CONFIG_FS_POSIX_ACL
 877         else if (exp_connect_flags(exp) & OBD_CONNECT_ACL) {
 878                 const struct lu_env *env = info->mti_env;
 879                 struct md_object *next = mdt_object_child(o);
 880                 struct lu_buf *buf = &info->mti_buf;
 881
 882                 buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 883                 buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 884                                                    RCL_SERVER);
 885                 if (buf->lb_len > 0) {
 886                         rc = mo_xattr_get(env, next, buf,
 887                                           XATTR_NAME_ACL_ACCESS);
 888                         if (rc < 0) {
 889                                 if (rc == -ENODATA) {
 890                                         repbody->aclsize = 0;
 891                                         repbody->valid |= OBD_MD_FLACL;
 892                                         rc = 0;
 893                                 } else if (rc == -EOPNOTSUPP) {
 894                                         rc = 0;
 895                                 } else {
 896                                         CERROR("got acl size: %d\n", rc);
 897                                 }
 898                         } else {
 899                                 repbody->aclsize = rc;
 900                                 repbody->valid |= OBD_MD_FLACL;
 901                                 rc = 0;
 902                         }
 903                 }
 904         }
 905 #endif
 906
 907         if (info->mti_mdt->mdt_lut.lut_mds_capa &&
 908             exp_connect_flags(exp) & OBD_CONNECT_MDS_CAPA) {
 909                 struct lustre_capa *capa;
 910
 911                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
 912                 LASSERT(capa);
 913                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 914                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 915                 if (rc)
 916                         RETURN(rc);
 917                 repbody->valid |= OBD_MD_FLMDSCAPA;
 918         }
 919         if (info->mti_mdt->mdt_lut.lut_oss_capa &&
 920             exp_connect_flags(exp) & OBD_CONNECT_OSS_CAPA &&
 921             S_ISREG(lu_object_attr(&o->mot_obj))) {
 922                 struct lustre_capa *capa;
 923
 924                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
 925                 LASSERT(capa);
 926                 capa->lc_opc = CAPA_OPC_OSS_DEFAULT | capa_open_opc(flags);
 927                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 928                 if (rc)
 929                         RETURN(rc);
 930                 repbody->valid |= OBD_MD_FLOSSCAPA;
 931         }
 932
 933         /*
 934          * If we are following a symlink, don't open; and do not return open
 935          * handle for special nodes as client required.
 936          */
 937         if (islnk || (!isreg && !isdir &&
 938             (exp_connect_flags(req->rq_export) & OBD_CONNECT_NODEVOH))) {
 939                 lustre_msg_set_transno(req->rq_repmsg, 0);
 940                 RETURN(0);
 941         }
 942
 943         /*
 944          * We need to return the existing object's fid back, so it is done here,
 945          * after preparing the reply.
 946          */
 947         if (!created && (flags & MDS_OPEN_EXCL) && (flags & MDS_OPEN_CREAT))
 948                 RETURN(-EEXIST);
 949
 950         /* This can't be done earlier, we need to return reply body */
 951         if (isdir) {
 952                 if (flags & (MDS_OPEN_CREAT | FMODE_WRITE)) {
 953                         /* We are trying to create or write an existing dir. */
 954                         RETURN(-EISDIR);
 955                 }
 956         } else if (flags & MDS_OPEN_DIRECTORY)
 957                 RETURN(-ENOTDIR);
 958
 959         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_OPEN_CREATE,
 960                                  OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE)) {
 961                 RETURN(-EAGAIN);
 962         }
 963
 964         mfd = NULL;
 965         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
 966                 spin_lock(&med->med_open_lock);
 967                 cfs_list_for_each(t, &med->med_open_head) {
 968                         mfd = cfs_list_entry(t, struct mdt_file_data, mfd_list);
 969                         if (mfd->mfd_xid == req->rq_xid)
 970                                 break;
 971                         mfd = NULL;
 972                 }
 973                 spin_unlock(&med->med_open_lock);
 974
 975                 if (mfd != NULL) {
 976                         repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 977                         /*set repbody->ea_size for resent case*/
 978                         if (ma->ma_valid & MA_LOV) {
 979                                 LASSERT(ma->ma_lmm_size != 0);
 980                                 repbody->eadatasize = ma->ma_lmm_size;
 981                                 if (isdir)
 982                                         repbody->valid |= OBD_MD_FLDIREA;
 983                                 else
 984                                         repbody->valid |= OBD_MD_FLEASIZE;
 985                         }
 986                         mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 987                         RETURN(0);
 988                 }
 989         }
 990
 991         rc = mdt_mfd_open(info, p, o, flags, created, rep);
 992         if (!rc)
 993                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 994
 995         RETURN(rc);
 996 }
 997
 998 extern void mdt_req_from_lcd(struct ptlrpc_request *req,
 999                              struct lsd_client_data *lcd);
1000
1001 void mdt_reconstruct_open(struct mdt_thread_info *info,
1002                           struct mdt_lock_handle *lhc)
1003 {
1004         const struct lu_env *env = info->mti_env;
1005         struct mdt_device       *mdt  = info->mti_mdt;
1006         struct req_capsule      *pill = info->mti_pill;
1007         struct ptlrpc_request   *req  = mdt_info_req(info);
1008         struct tg_export_data   *ted  = &req->rq_export->exp_target_data;
1009         struct lsd_client_data  *lcd  = ted->ted_lcd;
1010         struct md_attr          *ma   = &info->mti_attr;
1011         struct mdt_reint_record *rr   = &info->mti_rr;
1012         __u64                   flags = info->mti_spec.sp_cr_flags;
1013         struct ldlm_reply       *ldlm_rep;
1014         struct mdt_object       *parent;
1015         struct mdt_object       *child;
1016         struct mdt_body         *repbody;
1017         int                      rc;
1018         ENTRY;
1019
1020         LASSERT(pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
1021         ldlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
1022         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1023
1024         ma->ma_lmm = req_capsule_server_get(pill, &RMF_MDT_MD);
1025         ma->ma_lmm_size = req_capsule_get_size(pill, &RMF_MDT_MD,
1026                                                RCL_SERVER);
1027         ma->ma_need = MA_INODE | MA_HSM;
1028         if (ma->ma_lmm_size > 0)
1029                 ma->ma_need |= MA_LOV;
1030
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                 child = mdt_object_find(env, mdt, rr->rr_fid2);
1062                 if (IS_ERR(child)) {
1063                         rc = PTR_ERR(child);
1064                         LCONSOLE_WARN("Child "DFID" lookup error %d."
1065                                       " Evicting client %s with export %s.\n",
1066                                       PFID(mdt_object_fid(child)), rc,
1067                                       obd_uuid2str(&exp->exp_client_uuid),
1068                                       obd_export_nid2str(exp));
1069                         mdt_object_put(env, parent);
1070                         mdt_export_evict(exp);
1071                         RETURN_EXIT;
1072                 }
1073
1074                 if (unlikely(mdt_object_remote(child))) {
1075                         /* the child object was created on remote server */
1076                         if (!mdt_is_dne_client(exp)) {
1077                                 /* Return -EIO for old client */
1078                                 mdt_object_put(env, parent);
1079                                 mdt_object_put(env, child);
1080                                 GOTO(out, rc = -EIO);
1081                         }
1082                         repbody->fid1 = *rr->rr_fid2;
1083                         repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1084                         rc = 0;
1085                 } else {
1086                         if (mdt_object_exists(child)) {
1087                                 mdt_set_capainfo(info, 1, rr->rr_fid2,
1088                                                  BYPASS_CAPA);
1089                                 rc = mdt_attr_get_complex(info, child, ma);
1090                                 if (rc == 0)
1091                                         rc = mdt_finish_open(info, parent,
1092                                                              child, flags,
1093                                                              1, ldlm_rep);
1094                         } else {
1095                                 /* the child does not exist, we should do
1096                                  * regular open */
1097                                 mdt_object_put(env, parent);
1098                                 mdt_object_put(env, child);
1099                                 GOTO(regular_open, 0);
1100                         }
1101                 }
1102                 mdt_object_put(env, parent);
1103                 mdt_object_put(env, child);
1104                 GOTO(out, rc);
1105         } else {
1106 regular_open:
1107                 /* We did not try to create, so we are a pure open */
1108                 rc = mdt_reint_open(info, lhc);
1109         }
1110
1111         EXIT;
1112 out:
1113         req->rq_status = rc;
1114         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1115         LASSERT(ergo(rc < 0, lustre_msg_get_transno(req->rq_repmsg) == 0));
1116 }
1117
1118 int mdt_open_by_fid(struct mdt_thread_info *info, struct ldlm_reply *rep)
1119 {
1120         __u64                    flags = info->mti_spec.sp_cr_flags;
1121         struct mdt_reint_record *rr = &info->mti_rr;
1122         struct md_attr          *ma = &info->mti_attr;
1123         struct mdt_object       *o;
1124         int                      rc;
1125         ENTRY;
1126
1127         o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
1128         if (IS_ERR(o))
1129                 RETURN(rc = PTR_ERR(o));
1130
1131         if (unlikely(mdt_object_remote(o))) {
1132                 /* the child object was created on remote server */
1133                 struct mdt_body *repbody;
1134
1135                 mdt_set_disposition(info, rep, (DISP_IT_EXECD |
1136                                                 DISP_LOOKUP_EXECD |
1137                                                 DISP_LOOKUP_POS));
1138                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1139                 repbody->fid1 = *rr->rr_fid2;
1140                 repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1141                 rc = 0;
1142         } else {
1143                 if (mdt_object_exists(o)) {
1144                         mdt_set_disposition(info, rep, (DISP_IT_EXECD |
1145                                                         DISP_LOOKUP_EXECD |
1146                                                         DISP_LOOKUP_POS));
1147
1148                         rc = mdt_attr_get_complex(info, o, ma);
1149                         if (rc == 0)
1150                                 rc = mdt_finish_open(info, NULL, o, flags, 0,
1151                                                      rep);
1152                 } else {
1153                         rc = -ENOENT;
1154                 }
1155         }
1156
1157         mdt_object_put(info->mti_env, o);
1158         RETURN(rc);
1159 }
1160
1161 /* lock object for open */
1162 static int mdt_object_open_lock(struct mdt_thread_info *info,
1163                                 struct mdt_object *obj,
1164                                 struct mdt_lock_handle *lhc,
1165                                 __u64 *ibits)
1166 {
1167         struct md_attr  *ma = &info->mti_attr;
1168         __u64            open_flags = info->mti_spec.sp_cr_flags;
1169         ldlm_mode_t      lm = LCK_CR;
1170         bool             acq_lease = !!(open_flags & MDS_OPEN_LEASE);
1171         bool             try_layout = false;
1172         bool             create_layout = false;
1173         int              rc = 0;
1174         ENTRY;
1175
1176         *ibits = 0;
1177         mdt_lock_handle_init(lhc);
1178
1179         if (req_is_replay(mdt_info_req(info)))
1180                 RETURN(0);
1181
1182         if (S_ISREG(lu_object_attr(&obj->mot_obj))) {
1183                 if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV) &&
1184                     md_should_create(open_flags))
1185                         create_layout = true;
1186                 if (exp_connect_layout(info->mti_exp) && !create_layout &&
1187                     ma->ma_need & MA_LOV)
1188                         try_layout = true;
1189         }
1190
1191         if (acq_lease) {
1192                 /* lease open, acquire write mode of open sem */
1193                 down_write(&obj->mot_open_sem);
1194
1195                 /* Lease exists and ask for new lease */
1196                 if (atomic_read(&obj->mot_lease_count) > 0) {
1197                         /* only exclusive open is supported, so lease
1198                          * are conflicted to each other */
1199                         GOTO(out, rc = -EBUSY);
1200                 }
1201
1202                 /* Lease must be with open lock */
1203                 if (!(open_flags & MDS_OPEN_LOCK)) {
1204                         CERROR("Request lease for file:"DFID ", but open lock "
1205                                 "is missed, open_flags = "LPO64".\n",
1206                                 PFID(mdt_object_fid(obj)), open_flags);
1207                         GOTO(out, rc = -EPROTO);
1208                 }
1209
1210                 /* XXX: only exclusive open is supported. */
1211                 lm = LCK_EX;
1212                 *ibits = MDS_INODELOCK_OPEN;
1213
1214                 /* never grant LCK_EX layout lock to client */
1215                 try_layout = false;
1216         } else { /* normal open */
1217                 /* normal open holds read mode of open sem */
1218                 down_read(&obj->mot_open_sem);
1219
1220                 if (open_flags & MDS_OPEN_LOCK) {
1221                         if (open_flags & FMODE_WRITE)
1222                                 lm = LCK_CW;
1223                         else if (open_flags & MDS_FMODE_EXEC)
1224                                 lm = LCK_PR;
1225                         else
1226                                 lm = LCK_CR;
1227
1228                         *ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_OPEN;
1229                 } else if (atomic_read(&obj->mot_lease_count) > 0) {
1230                         if (open_flags & FMODE_WRITE)
1231                                 lm = LCK_CW;
1232                         else
1233                                 lm = LCK_CR;
1234
1235                         /* revoke lease */
1236                         *ibits = MDS_INODELOCK_OPEN;
1237                         try_layout = false;
1238
1239                         lhc = &info->mti_lh[MDT_LH_LOCAL];
1240                 }
1241                 CDEBUG(D_INODE, "normal open:"DFID" lease count: %d, lm: %d\n",
1242                         PFID(mdt_object_fid(obj)),
1243                         atomic_read(&obj->mot_open_count), lm);
1244         }
1245
1246         mdt_lock_reg_init(lhc, lm);
1247
1248         /* one problem to return layout lock on open is that it may result
1249          * in too many layout locks cached on the client side. */
1250         if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_OPEN) && try_layout) {
1251                 /* return lookup lock to validate inode at the client side,
1252                  * this is pretty important otherwise mdt will return layout
1253                  * lock for each open.
1254                  * However this is a double-edged sword because changing
1255                  * permission will revoke huge # of LOOKUP locks. */
1256                 *ibits |= MDS_INODELOCK_LAYOUT | MDS_INODELOCK_LOOKUP;
1257                 if (!mdt_object_lock_try(info, obj, lhc, *ibits,
1258                                          MDT_CROSS_LOCK)) {
1259                         *ibits &= ~(MDS_INODELOCK_LAYOUT|MDS_INODELOCK_LOOKUP);
1260                         if (*ibits != 0)
1261                                 rc = mdt_object_lock(info, obj, lhc, *ibits,
1262                                                 MDT_CROSS_LOCK);
1263                 }
1264         } else if (*ibits != 0) {
1265                 rc = mdt_object_lock(info, obj, lhc, *ibits, MDT_CROSS_LOCK);
1266         }
1267
1268         CDEBUG(D_INODE, "Requested bits lock:"DFID ", ibits = "LPX64
1269                 ", open_flags = "LPO64", try_layout = %d, rc = %d\n",
1270                 PFID(mdt_object_fid(obj)), *ibits, open_flags, try_layout, rc);
1271
1272         /* will change layout, revoke layout locks by enqueuing EX lock. */
1273         if (rc == 0 && create_layout) {
1274                 struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LAYOUT];
1275
1276                 CDEBUG(D_INODE, "Will create layout, get EX layout lock:"DFID
1277                         ", open_flags = "LPO64"\n",
1278                         PFID(mdt_object_fid(obj)), open_flags);
1279
1280                 /* We cannot enqueue another lock for the same resource we
1281                  * already have a lock for, due to mechanics of waiting list
1282                  * iterating in ldlm, see LU-3601.
1283                  * As such we'll drop the open lock we just got above here,
1284                  * it's ok not to have this open lock as it's main purpose is to
1285                  * flush unused cached client open handles. */
1286                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
1287                         mdt_object_unlock(info, obj, lhc, 1);
1288
1289                 LASSERT(!try_layout);
1290                 mdt_lock_handle_init(ll);
1291                 mdt_lock_reg_init(ll, LCK_EX);
1292                 rc = mdt_object_lock(info, obj, ll, MDS_INODELOCK_LAYOUT,
1293                                         MDT_LOCAL_LOCK);
1294
1295                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_LL_BLOCK, 2);
1296         }
1297
1298         /* Check if there is any other open handles after acquiring
1299          * open lock. At this point, caching open handles have been revoked
1300          * by open lock.
1301          * XXX: Now only exclusive open is supported. Need to check the
1302          * type of open for generic lease support. */
1303         if (rc == 0 && acq_lease) {
1304                 struct ptlrpc_request *req = mdt_info_req(info);
1305                 struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
1306                 struct mdt_file_data *mfd;
1307                 bool is_replay_or_resent;
1308                 int open_count = 0;
1309
1310                 /* For lease: application can open a file and then apply lease,
1311                  * @handle contains original open handle in that case.
1312                  * In recovery, open REQ will be replayed and the lease REQ may
1313                  * be resent that means the open handle is already stale, so we
1314                  * need to fix it up here by finding new handle. */
1315                 is_replay_or_resent = req_is_replay(req) ||
1316                         lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT;
1317
1318                 /* if the request is _not_ a replay request, rr_handle
1319                  * may be used to hold an openhandle which is issuing the
1320                  * lease request, so that this openhandle doesn't count. */
1321                 mfd = mdt_handle2mfd(med, info->mti_rr.rr_handle,
1322                                      is_replay_or_resent);
1323                 if (mfd != NULL)
1324                         ++open_count;
1325
1326                 CDEBUG(D_INODE, "acq_lease "DFID": openers: %d, want: %d\n",
1327                         PFID(mdt_object_fid(obj)),
1328                         atomic_read(&obj->mot_open_count), open_count);
1329
1330                 if (atomic_read(&obj->mot_open_count) > open_count)
1331                         GOTO(out, rc = -EBUSY);
1332         }
1333         GOTO(out, rc);
1334
1335 out:
1336         RETURN(rc);
1337 }
1338
1339 static void mdt_object_open_unlock(struct mdt_thread_info *info,
1340                                    struct mdt_object *obj,
1341                                    struct mdt_lock_handle *lhc,
1342                                    __u64 ibits, int rc)
1343 {
1344         __u64 open_flags = info->mti_spec.sp_cr_flags;
1345         struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LOCAL];
1346         ENTRY;
1347
1348         if (req_is_replay(mdt_info_req(info)))
1349                 RETURN_EXIT;
1350
1351         /* Release local lock - the lock put in MDT_LH_LOCAL will never
1352          * return to client side. */
1353         if (lustre_handle_is_used(&ll->mlh_reg_lh))
1354                 mdt_object_unlock(info, obj, ll, 1);
1355
1356         ll = &info->mti_lh[MDT_LH_LAYOUT];
1357         /* Release local layout lock, layout was created */
1358         if (lustre_handle_is_used(&ll->mlh_reg_lh)) {
1359                 LASSERT(!(ibits & MDS_INODELOCK_LAYOUT));
1360                 mdt_object_unlock(info, obj, ll, 1);
1361         }
1362
1363         if (open_flags & MDS_OPEN_LEASE)
1364                 up_write(&obj->mot_open_sem);
1365         else
1366                 up_read(&obj->mot_open_sem);
1367
1368         /* Cross-ref case, the lock should be returned to the client */
1369         if (ibits == 0 || rc == -EREMOTE)
1370                 RETURN_EXIT;
1371
1372         if (!(open_flags & MDS_OPEN_LOCK) && !(ibits & MDS_INODELOCK_LAYOUT)) {
1373                 /* for the open request, the lock will only return to client
1374                  * if open or layout lock is granted. */
1375                 rc = 1;
1376         }
1377
1378         if (rc != 0 || !lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1379                 struct ldlm_reply       *ldlm_rep;
1380
1381                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
1382                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1383                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
1384                         mdt_object_unlock(info, obj, lhc, 1);
1385         }
1386         RETURN_EXIT;
1387 }
1388
1389 /**
1390  * Check release is permitted for the current HSM flags.
1391  */
1392 static bool mdt_hsm_release_allow(const struct md_attr *ma)
1393 {
1394         if (!(ma->ma_valid & MA_HSM))
1395                 return false;
1396
1397         if (ma->ma_hsm.mh_flags & (HS_DIRTY|HS_NORELEASE|HS_LOST))
1398                 return false;
1399
1400         if (!(ma->ma_hsm.mh_flags & HS_ARCHIVED))
1401                 return false;
1402
1403         return true;
1404 }
1405
1406 int mdt_open_by_fid_lock(struct mdt_thread_info *info, struct ldlm_reply *rep,
1407                          struct mdt_lock_handle *lhc)
1408 {
1409         const struct lu_env     *env   = info->mti_env;
1410         struct mdt_device       *mdt   = info->mti_mdt;
1411         __u64                    flags = info->mti_spec.sp_cr_flags;
1412         struct mdt_reint_record *rr    = &info->mti_rr;
1413         struct md_attr          *ma    = &info->mti_attr;
1414         struct mdt_object       *parent= NULL;
1415         struct mdt_object       *o;
1416         int                      rc;
1417         __u64                    ibits = 0;
1418         ENTRY;
1419
1420         if (md_should_create(flags) && !(flags & MDS_OPEN_HAS_EA)) {
1421                 if (!lu_fid_eq(rr->rr_fid1, rr->rr_fid2)) {
1422                         parent = mdt_object_find(env, mdt, rr->rr_fid1);
1423                         if (IS_ERR(parent)) {
1424                                 CDEBUG(D_INODE, "Fail to find parent "DFID
1425                                        " for anonymous created %ld, try to"
1426                                        " use server-side parent.\n",
1427                                        PFID(rr->rr_fid1), PTR_ERR(parent));
1428                                 parent = NULL;
1429                         }
1430                 }
1431                 if (parent == NULL)
1432                         ma->ma_need |= MA_PFID;
1433         }
1434
1435         o = mdt_object_find(env, mdt, rr->rr_fid2);
1436         if (IS_ERR(o))
1437                 RETURN(rc = PTR_ERR(o));
1438
1439         if (mdt_object_remote(o)) {
1440                 CDEBUG(D_INFO, "%s: "DFID" is on remote MDT.\n",
1441                        mdt_obd_name(info->mti_mdt),
1442                        PFID(rr->rr_fid2));
1443                 GOTO(out, rc = -EREMOTE);
1444         } else if (!mdt_object_exists(o)) {
1445                 mdt_set_disposition(info, rep,
1446                                     DISP_IT_EXECD |
1447                                     DISP_LOOKUP_EXECD |
1448                                     DISP_LOOKUP_NEG);
1449                 GOTO(out, rc = -ENOENT);
1450         }
1451
1452         mdt_set_disposition(info, rep, (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1453
1454         if (flags & MDS_OPEN_RELEASE)
1455                 ma->ma_need |= MA_HSM;
1456         rc = mdt_attr_get_complex(info, o, ma);
1457         if (rc)
1458                 GOTO(out, rc);
1459
1460         /* If a release request, check file flags are fine and ask for an
1461          * exclusive open access. */
1462         if (flags & MDS_OPEN_RELEASE && !mdt_hsm_release_allow(ma))
1463                 GOTO(out, rc = -EPERM);
1464
1465         rc = mdt_object_open_lock(info, o, lhc, &ibits);
1466         if (rc)
1467                 GOTO(out_unlock, rc);
1468
1469         if (ma->ma_valid & MA_PFID) {
1470                 parent = mdt_object_find(env, mdt, &ma->ma_pfid);
1471                 if (IS_ERR(parent)) {
1472                         CDEBUG(D_INODE, "Fail to find parent "DFID
1473                                " for anonymous created %ld, try to"
1474                                " use system default.\n",
1475                                PFID(&ma->ma_pfid), PTR_ERR(parent));
1476                         parent = NULL;
1477                 }
1478         }
1479
1480         rc = mdt_finish_open(info, parent, o, flags, 0, rep);
1481         if (!rc) {
1482                 mdt_set_disposition(info, rep, DISP_LOOKUP_POS);
1483                 if (flags & MDS_OPEN_LOCK)
1484                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
1485                 if (flags & MDS_OPEN_LEASE)
1486                         mdt_set_disposition(info, rep, DISP_OPEN_LEASE);
1487         }
1488         GOTO(out_unlock, rc);
1489
1490 out_unlock:
1491         mdt_object_open_unlock(info, o, lhc, ibits, rc);
1492 out:
1493         mdt_object_put(env, o);
1494         if (parent != NULL)
1495                 mdt_object_put(env, parent);
1496         return rc;
1497 }
1498
1499 /* Cross-ref request. Currently it can only be a pure open (w/o create) */
1500 static int mdt_cross_open(struct mdt_thread_info *info,
1501                           const struct lu_fid *parent_fid,
1502                           const struct lu_fid *fid,
1503                           struct ldlm_reply *rep, __u32 flags)
1504 {
1505         struct md_attr    *ma = &info->mti_attr;
1506         struct mdt_object *o;
1507         int                rc;
1508         ENTRY;
1509
1510         o = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1511         if (IS_ERR(o))
1512                 RETURN(rc = PTR_ERR(o));
1513
1514         if (mdt_object_remote(o)) {
1515                 /* Something is wrong here, the object is on another MDS! */
1516                 CERROR("%s: "DFID" isn't on this server!: rc = %d\n",
1517                        mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1518                 LU_OBJECT_DEBUG(D_WARNING, info->mti_env,
1519                                 &o->mot_obj,
1520                                 "Object isn't on this server! FLD error?\n");
1521                 rc = -EFAULT;
1522         } else {
1523                 if (mdt_object_exists(o)) {
1524                         /* Do permission check for cross-open. */
1525                         rc = mo_permission(info->mti_env, NULL,
1526                                            mdt_object_child(o),
1527                                            NULL, flags | MDS_OPEN_CROSS);
1528                         if (rc)
1529                                 goto out;
1530
1531                         mdt_set_capainfo(info, 0, fid, BYPASS_CAPA);
1532                         rc = mdt_attr_get_complex(info, o, ma);
1533                         if (rc != 0)
1534                                 GOTO(out, rc);
1535
1536                         /* Do not create lov object if the fid is opened
1537                          * under OBF */
1538                         if (S_ISREG(ma->ma_attr.la_mode) &&
1539                             !(ma->ma_valid & MA_LOV) && (flags & FMODE_WRITE) &&
1540                             fid_is_obf(parent_fid))
1541                                 GOTO(out, rc = -EPERM);
1542
1543                         rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
1544                 } else {
1545                         /*
1546                          * Something is wrong here. lookup was positive but
1547                          * there is no object!
1548                          */
1549                         CERROR("%s: "DFID" doesn't exist!: rc = %d\n",
1550                               mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1551                         rc = -EFAULT;
1552                 }
1553         }
1554 out:
1555         mdt_object_put(info->mti_env, o);
1556         RETURN(rc);
1557 }
1558
1559 int mdt_reint_open(struct mdt_thread_info *info, struct mdt_lock_handle *lhc)
1560 {
1561         struct mdt_device       *mdt = info->mti_mdt;
1562         struct ptlrpc_request   *req = mdt_info_req(info);
1563         struct mdt_object       *parent;
1564         struct mdt_object       *child;
1565         struct mdt_lock_handle  *lh;
1566         struct ldlm_reply       *ldlm_rep;
1567         struct mdt_body         *repbody;
1568         struct lu_fid           *child_fid = &info->mti_tmp_fid1;
1569         struct md_attr          *ma = &info->mti_attr;
1570         __u64                    create_flags = info->mti_spec.sp_cr_flags;
1571         __u64                    ibits = 0;
1572         struct mdt_reint_record *rr = &info->mti_rr;
1573         int                      result, rc;
1574         int                      created = 0;
1575         __u32                    msg_flags;
1576         ENTRY;
1577
1578         OBD_FAIL_TIMEOUT_ORSET(OBD_FAIL_MDS_PAUSE_OPEN, OBD_FAIL_ONCE,
1579                                (obd_timeout + 1) / 4);
1580
1581         mdt_counter_incr(req, LPROC_MDT_OPEN);
1582         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1583
1584         ma->ma_lmm = req_capsule_server_get(info->mti_pill, &RMF_MDT_MD);
1585         ma->ma_lmm_size = req_capsule_get_size(info->mti_pill, &RMF_MDT_MD,
1586                                                RCL_SERVER);
1587         ma->ma_need = MA_INODE;
1588         if (ma->ma_lmm_size > 0)
1589                 ma->ma_need |= MA_LOV;
1590
1591         ma->ma_valid = 0;
1592
1593         LASSERT(info->mti_pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
1594         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
1595
1596         if (unlikely(create_flags & MDS_OPEN_JOIN_FILE)) {
1597                 CERROR("file join is not supported anymore.\n");
1598                 GOTO(out, result = err_serious(-EOPNOTSUPP));
1599         }
1600         msg_flags = lustre_msg_get_flags(req->rq_reqmsg);
1601
1602         if ((create_flags & (MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS)) &&
1603             info->mti_spec.u.sp_ea.eadata == NULL)
1604                 GOTO(out, result = err_serious(-EINVAL));
1605
1606         CDEBUG(D_INODE, "I am going to open "DFID"/("DNAME"->"DFID") "
1607                "cr_flag="LPO64" mode=0%06o msg_flag=0x%x\n",
1608                PFID(rr->rr_fid1), PNAME(&rr->rr_name),
1609                PFID(rr->rr_fid2), create_flags,
1610                ma->ma_attr.la_mode, msg_flags);
1611
1612         if (info->mti_cross_ref) {
1613                 /* This is cross-ref open */
1614                 mdt_set_disposition(info, ldlm_rep,
1615                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD |
1616                              DISP_LOOKUP_POS));
1617                 result = mdt_cross_open(info, rr->rr_fid2, rr->rr_fid1,
1618                                         ldlm_rep, create_flags);
1619                 GOTO(out, result);
1620         } else if (req_is_replay(req) ||
1621             (req->rq_export->exp_libclient && create_flags & MDS_OPEN_HAS_EA)) {
1622                 /* This is a replay request or from liblustre with ea. */
1623                 result = mdt_open_by_fid(info, ldlm_rep);
1624
1625                 if (result != -ENOENT) {
1626                         if (req->rq_export->exp_libclient &&
1627                             create_flags & MDS_OPEN_HAS_EA)
1628                                 GOTO(out, result = 0);
1629                         GOTO(out, result);
1630                 }
1631                 /* We didn't find the correct object, so we need to re-create it
1632                  * via a regular replay. */
1633                 if (!(create_flags & MDS_OPEN_CREAT)) {
1634                         DEBUG_REQ(D_ERROR, req,
1635                                   "OPEN & CREAT not in open replay/by_fid.");
1636                         GOTO(out, result = -EFAULT);
1637                 }
1638                 CDEBUG(D_INFO, "No object(1), continue as regular open.\n");
1639         } else if ((!lu_name_is_valid(&rr->rr_name) &&
1640                     (create_flags & MDS_OPEN_LOCK)) ||
1641                    (create_flags & MDS_OPEN_BY_FID)) {
1642                 result = mdt_open_by_fid_lock(info, ldlm_rep, lhc);
1643                 /* If result is 0 then open by FID has found the file
1644                  * and there is nothing left for us to do here.  More
1645                  * generally if it is anything other than -ENOENT or
1646                  * -EREMOTE then we return that now.  If -ENOENT and
1647                  * MDS_OPEN_CREAT is set then we must create the file
1648                  * below.  If -EREMOTE then we need to return a LOOKUP
1649                  * lock to the client, which we do below.  Hence this
1650                  * odd looking condition.  See LU-2523. */
1651                 if (!(result == -ENOENT && (create_flags & MDS_OPEN_CREAT)) &&
1652                     result != -EREMOTE)
1653                         GOTO(out, result);
1654
1655                 CDEBUG(D_INFO, "No object(2), continue as regular open.\n");
1656         }
1657
1658         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK))
1659                 GOTO(out, result = err_serious(-ENOMEM));
1660
1661         mdt_set_disposition(info, ldlm_rep,
1662                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1663
1664         if (!lu_name_is_valid(&rr->rr_name))
1665                 GOTO(out, result = -EPROTO);
1666
1667         lh = &info->mti_lh[MDT_LH_PARENT];
1668         mdt_lock_pdo_init(lh,
1669                           (create_flags & MDS_OPEN_CREAT) ? LCK_PW : LCK_PR,
1670                           &rr->rr_name);
1671
1672         parent = mdt_object_find_lock(info, rr->rr_fid1, lh,
1673                                       MDS_INODELOCK_UPDATE);
1674         if (IS_ERR(parent))
1675                 GOTO(out, result = PTR_ERR(parent));
1676
1677         /* get and check version of parent */
1678         result = mdt_version_get_check(info, parent, 0);
1679         if (result)
1680                 GOTO(out_parent, result);
1681
1682         fid_zero(child_fid);
1683
1684         result = mdo_lookup(info->mti_env, mdt_object_child(parent),
1685                             &rr->rr_name, child_fid, &info->mti_spec);
1686
1687         LASSERTF(ergo(result == 0, fid_is_sane(child_fid)),
1688                  "looking for "DFID"/"DNAME", found FID = "DFID"\n",
1689                  PFID(mdt_object_fid(parent)), PNAME(&rr->rr_name),
1690                  PFID(child_fid));
1691
1692         if (result != 0 && result != -ENOENT && result != -ESTALE)
1693                 GOTO(out_parent, result);
1694
1695         if (result == -ENOENT || result == -ESTALE) {
1696                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1697                 if (result == -ESTALE) {
1698                         /*
1699                          * -ESTALE means the parent is a dead(unlinked) dir, so
1700                          * it should return -ENOENT to in accordance with the
1701                          * original mds implementaion.
1702                          */
1703                         GOTO(out_parent, result = -ENOENT);
1704                 }
1705                 if (!(create_flags & MDS_OPEN_CREAT))
1706                         GOTO(out_parent, result);
1707                 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
1708                         GOTO(out_parent, result = -EROFS);
1709                 *child_fid = *info->mti_rr.rr_fid2;
1710                 LASSERTF(fid_is_sane(child_fid), "fid="DFID"\n",
1711                          PFID(child_fid));
1712                 /* In the function below, .hs_keycmp resolves to
1713                  * lu_obj_hop_keycmp() */
1714                 /* coverity[overrun-buffer-val] */
1715                 child = mdt_object_new(info->mti_env, mdt, child_fid);
1716         } else {
1717                 /*
1718                  * Check for O_EXCL is moved to the mdt_finish_open(), we need to
1719                  * return FID back in that case.
1720                  */
1721                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1722                 child = mdt_object_find(info->mti_env, mdt, child_fid);
1723         }
1724         if (IS_ERR(child))
1725                 GOTO(out_parent, result = PTR_ERR(child));
1726
1727         /** check version of child  */
1728         rc = mdt_version_get_check(info, child, 1);
1729         if (rc)
1730                 GOTO(out_child, result = rc);
1731
1732         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1733         if (result == -ENOENT) {
1734                 /* Create under OBF and .lustre is not permitted */
1735                 if (fid_is_obf(rr->rr_fid1) || fid_is_dot_lustre(rr->rr_fid1))
1736                         GOTO(out_child, result = -EPERM);
1737
1738                 /* save versions in reply */
1739                 mdt_version_get_save(info, parent, 0);
1740                 mdt_version_get_save(info, child, 1);
1741
1742                 /* version of child will be changed */
1743                 tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(child));
1744
1745                 /* Not found and with MDS_OPEN_CREAT: let's create it. */
1746                 mdt_set_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1747
1748                 /* Let lower layers know what is lock mode on directory. */
1749                 info->mti_spec.sp_cr_mode =
1750                         mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
1751
1752                 /*
1753                  * Do not perform lookup sanity check. We know that name does
1754                  * not exist.
1755                  */
1756                 info->mti_spec.sp_cr_lookup = 0;
1757                 info->mti_spec.sp_feat = &dt_directory_features;
1758
1759                 result = mdo_create(info->mti_env,
1760                                     mdt_object_child(parent),
1761                                     &rr->rr_name,
1762                                     mdt_object_child(child),
1763                                     &info->mti_spec,
1764                                     &info->mti_attr);
1765                 if (result == -ERESTART) {
1766                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1767                         GOTO(out_child, result);
1768                 } else {
1769
1770                         /* XXX: we should call this once, see few lines below */
1771                         if (result == 0)
1772                                 result = mdt_attr_get_complex(info, child, ma);
1773
1774                         if (result != 0)
1775                                 GOTO(out_child, result);
1776                 }
1777                 created = 1;
1778         } else {
1779                 /*
1780                  * The object is on remote node, return its FID for remote open.
1781                  */
1782                 if (mdt_object_remote(child)) {
1783                         /*
1784                          * Check if this lock already was sent to client and
1785                          * this is resent case. For resent case do not take lock
1786                          * again, use what is already granted.
1787                          */
1788                         LASSERT(lhc != NULL);
1789
1790                         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1791                                 struct ldlm_lock *lock;
1792
1793                                 LASSERT(msg_flags & MSG_RESENT);
1794
1795                                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1796                                 if (!lock) {
1797                                         CERROR("Invalid lock handle "LPX64"\n",
1798                                                lhc->mlh_reg_lh.cookie);
1799                                         LBUG();
1800                                 }
1801                                 LASSERT(fid_res_name_eq(mdt_object_fid(child),
1802                                                         &lock->l_resource->lr_name));
1803                                 LDLM_LOCK_PUT(lock);
1804                                 rc = 0;
1805                         } else {
1806                                 mdt_lock_handle_init(lhc);
1807                                 mdt_lock_reg_init(lhc, LCK_PR);
1808
1809                                 rc = mdt_object_lock(info, child, lhc,
1810                                                      MDS_INODELOCK_LOOKUP,
1811                                                      MDT_CROSS_LOCK);
1812                         }
1813                         repbody->fid1 = *mdt_object_fid(child);
1814                         repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1815                         if (rc != 0)
1816                                 result = rc;
1817                         else
1818                                 result = -EREMOTE;
1819                         GOTO(out_child, result);
1820                 } else if (mdt_object_exists(child)) {
1821                         /* We have to get attr & LOV EA & HSM for this
1822                          * object. */
1823                         ma->ma_need |= MA_HSM;
1824                         result = mdt_attr_get_complex(info, child, ma);
1825                 } else {
1826                         /* Object does not exist. Likely FS corruption. */
1827                         CERROR("%s: name '"DNAME"' present, but FID "
1828                                DFID" is invalid\n",
1829                                mdt_obd_name(info->mti_mdt),
1830                                PNAME(&rr->rr_name), PFID(child_fid));
1831                         GOTO(out_child, result = -EIO);
1832                 }
1833         }
1834
1835         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1836                 /* the open lock might already be gotten in
1837                  * mdt_intent_fixup_resent */
1838                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
1839                 if (create_flags & MDS_OPEN_LOCK)
1840                         mdt_set_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1841         } else {
1842                 /* get openlock if this isn't replay and client requested it */
1843                 if (!req_is_replay(req)) {
1844                         rc = mdt_object_open_lock(info, child, lhc, &ibits);
1845                         if (rc != 0)
1846                                 GOTO(out_child_unlock, result = rc);
1847                         else if (create_flags & MDS_OPEN_LOCK)
1848                                 mdt_set_disposition(info, ldlm_rep,
1849                                                     DISP_OPEN_LOCK);
1850                 }
1851         }
1852         /* Try to open it now. */
1853         rc = mdt_finish_open(info, parent, child, create_flags,
1854                              created, ldlm_rep);
1855         if (rc) {
1856                 result = rc;
1857                 /* openlock will be released if mdt_finish_open failed */
1858                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1859
1860                 if (created && create_flags & MDS_OPEN_VOLATILE) {
1861                         CERROR("%s: cannot open volatile file "DFID", orphan "
1862                                "file will be left in PENDING directory until "
1863                                "next reboot, rc = %d\n", mdt_obd_name(mdt),
1864                                PFID(mdt_object_fid(child)), rc);
1865                         GOTO(out_child_unlock, result);
1866                 }
1867
1868                 if (created) {
1869                         ma->ma_need = 0;
1870                         ma->ma_valid = 0;
1871                         ma->ma_cookie_size = 0;
1872                         rc = mdo_unlink(info->mti_env,
1873                                         mdt_object_child(parent),
1874                                         mdt_object_child(child),
1875                                         &rr->rr_name,
1876                                         &info->mti_attr, 0);
1877                         if (rc != 0)
1878                                 CERROR("%s: "DFID" cleanup of open: rc = %d\n",
1879                                        mdt_obd_name(info->mti_mdt),
1880                                        PFID(mdt_object_fid(child)), rc);
1881                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1882                 }
1883         }
1884         EXIT;
1885 out_child_unlock:
1886         mdt_object_open_unlock(info, child, lhc, ibits, result);
1887 out_child:
1888         mdt_object_put(info->mti_env, child);
1889 out_parent:
1890         mdt_object_unlock_put(info, parent, lh, result || !created);
1891 out:
1892         if (result)
1893                 lustre_msg_set_transno(req->rq_repmsg, 0);
1894         return result;
1895 }
1896
1897 /**
1898  * Create an orphan object use local root.
1899  */
1900 static struct mdt_object *mdt_orphan_open(struct mdt_thread_info *info,
1901                                           struct mdt_device *mdt,
1902                                           const struct lu_fid *fid,
1903                                           struct md_attr *attr, fmode_t fmode)
1904 {
1905         const struct lu_env *env = info->mti_env;
1906         struct md_op_spec *spec = &info->mti_spec;
1907         struct lu_fid *local_root_fid = &info->mti_tmp_fid1;
1908         struct mdt_object *obj = NULL;
1909         struct mdt_object *local_root;
1910         static const struct lu_name lname = {
1911                 .ln_name = "i_am_nobody",
1912                 .ln_namelen = sizeof("i_am_nobody") - 1,
1913         };
1914         struct lu_ucred *uc;
1915         cfs_cap_t uc_cap_save;
1916         int rc;
1917         ENTRY;
1918
1919         rc = dt_root_get(env, mdt->mdt_bottom, local_root_fid);
1920         if (rc != 0)
1921                 RETURN(ERR_PTR(rc));
1922
1923         local_root = mdt_object_find(env, mdt, local_root_fid);
1924         if (IS_ERR(local_root))
1925                 RETURN(local_root);
1926
1927         obj = mdt_object_new(env, mdt, fid);
1928         if (IS_ERR(obj))
1929                 GOTO(out, rc = PTR_ERR(obj));
1930
1931         spec->sp_cr_lookup = 0;
1932         spec->sp_feat = &dt_directory_features;
1933         spec->sp_cr_mode = MDL_MINMODE; /* no lock */
1934         spec->sp_cr_flags = MDS_OPEN_VOLATILE | fmode;
1935         if (attr->ma_valid & MA_LOV) {
1936                 spec->u.sp_ea.eadata = attr->ma_lmm;
1937                 spec->u.sp_ea.eadatalen = attr->ma_lmm_size;
1938                 spec->sp_cr_flags |= MDS_OPEN_HAS_EA;
1939         } else {
1940                 spec->sp_cr_flags |= MDS_OPEN_DELAY_CREATE;
1941         }
1942
1943         uc = lu_ucred(env);
1944         uc_cap_save = uc->uc_cap;
1945         uc->uc_cap |= 1 << CFS_CAP_DAC_OVERRIDE;
1946         rc = mdo_create(env, mdt_object_child(local_root), &lname,
1947                         mdt_object_child(obj), spec, attr);
1948         uc->uc_cap = uc_cap_save;
1949         if (rc < 0) {
1950                 CERROR("%s: cannot create volatile file "DFID": rc = %d\n",
1951                        mdt_obd_name(mdt), PFID(fid), rc);
1952                 GOTO(out, rc);
1953         }
1954
1955         rc = mo_open(env, mdt_object_child(obj), MDS_OPEN_CREATED);
1956         if (rc < 0)
1957                 CERROR("%s: cannot open volatile file "DFID", orphan "
1958                        "file will be left in PENDING directory until "
1959                        "next reboot, rc = %d\n", mdt_obd_name(mdt),
1960                        PFID(fid), rc);
1961         GOTO(out, rc);
1962
1963 out:
1964         if (rc < 0) {
1965                 if (!IS_ERR(obj))
1966                         mdt_object_put(env, obj);
1967                 obj = ERR_PTR(rc);
1968         }
1969         mdt_object_put(env, local_root);
1970         return obj;
1971 }
1972
1973 static int mdt_hsm_release(struct mdt_thread_info *info, struct mdt_object *o,
1974                            struct md_attr *ma)
1975 {
1976         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LAYOUT];
1977         struct close_data      *data;
1978         struct ldlm_lock       *lease;
1979         struct mdt_object      *orphan;
1980         struct md_attr         *orp_ma;
1981         struct lu_buf          *buf;
1982         bool                    lease_broken;
1983         int                     rc;
1984         int                     rc2;
1985         ENTRY;
1986
1987         if (exp_connect_flags(info->mti_exp) & OBD_CONNECT_RDONLY)
1988                 RETURN(-EROFS);
1989
1990         data = req_capsule_client_get(info->mti_pill, &RMF_CLOSE_DATA);
1991         if (data == NULL)
1992                 RETURN(-EPROTO);
1993
1994         lease = ldlm_handle2lock(&data->cd_handle);
1995         if (lease == NULL)
1996                 RETURN(-ESTALE);
1997
1998         /* try to hold open_sem so that nobody else can open the file */
1999         if (!down_write_trylock(&o->mot_open_sem)) {
2000                 ldlm_lock_cancel(lease);
2001                 GOTO(out_reprocess, rc = -EBUSY);
2002         }
2003
2004         /* Check if the lease open lease has already canceled */
2005         lock_res_and_lock(lease);
2006         lease_broken = ldlm_is_cancel(lease);
2007         unlock_res_and_lock(lease);
2008
2009         LDLM_DEBUG(lease, DFID " lease broken? %d\n",
2010                    PFID(mdt_object_fid(o)), lease_broken);
2011
2012         /* Cancel server side lease. Client side counterpart should
2013          * have been cancelled. It's okay to cancel it now as we've
2014          * held mot_open_sem. */
2015         ldlm_lock_cancel(lease);
2016
2017         if (lease_broken) /* don't perform release task */
2018                 GOTO(out_unlock, rc = -ESTALE);
2019
2020         if (fid_is_zero(&data->cd_fid) || !fid_is_sane(&data->cd_fid))
2021                 GOTO(out_unlock, rc = -EINVAL);
2022
2023         /* ma_need was set before but it seems fine to change it in order to
2024          * avoid modifying the one from RPC */
2025         ma->ma_need = MA_HSM;
2026         rc = mdt_attr_get_complex(info, o, ma);
2027         if (rc != 0)
2028                 GOTO(out_unlock, rc);
2029
2030         if (!mdt_hsm_release_allow(ma))
2031                 GOTO(out_unlock, rc = -EPERM);
2032
2033         /* already released? */
2034         if (ma->ma_hsm.mh_flags & HS_RELEASED)
2035                 GOTO(out_unlock, rc = 0);
2036
2037         /* Compare on-disk and packed data_version */
2038         if (data->cd_data_version != ma->ma_hsm.mh_arch_ver) {
2039                 CDEBUG(D_HSM, DFID" data_version mismatches: packed="LPU64
2040                        " and on-disk="LPU64"\n", PFID(mdt_object_fid(o)),
2041                        data->cd_data_version, ma->ma_hsm.mh_arch_ver);
2042                 GOTO(out_unlock, rc = -EPERM);
2043         }
2044
2045         ma->ma_valid = MA_INODE;
2046         ma->ma_attr.la_valid &= LA_ATIME | LA_MTIME | LA_CTIME | LA_SIZE;
2047         rc = mo_attr_set(info->mti_env, mdt_object_child(o), ma);
2048         if (rc < 0)
2049                 GOTO(out_unlock, rc);
2050
2051         ma->ma_need = MA_INODE | MA_LOV;
2052         rc = mdt_attr_get_complex(info, o, ma);
2053         if (rc < 0)
2054                 GOTO(out_unlock, rc);
2055
2056         if (!(ma->ma_valid & MA_LOV)) {
2057                 /* Even empty file are released */
2058                 memset(ma->ma_lmm, 0, sizeof(*ma->ma_lmm));
2059                 ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1_DEF);
2060                 ma->ma_lmm->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
2061                 ma->ma_lmm->lmm_stripe_size = cpu_to_le32(LOV_MIN_STRIPE_SIZE);
2062                 ma->ma_lmm_size = sizeof(*ma->ma_lmm);
2063         } else {
2064                 /* Magic must be LOV_MAGIC_Vx_DEF otherwise LOD will interpret
2065                  * ma_lmm as lov_user_md, then it will be confused by union of
2066                  * layout_gen and stripe_offset. */
2067                 if (le32_to_cpu(ma->ma_lmm->lmm_magic) == LOV_MAGIC_V1)
2068                         ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1_DEF);
2069                 else if (le32_to_cpu(ma->ma_lmm->lmm_magic) == LOV_MAGIC_V3)
2070                         ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V3_DEF);
2071                 else
2072                         GOTO(out_unlock, rc = -EINVAL);
2073         }
2074
2075         /* Set file as released */
2076         ma->ma_lmm->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_RELEASED);
2077
2078         /* Hopefully it's not used in this call path */
2079         orp_ma = &info->mti_u.som.attr;
2080         orp_ma->ma_attr.la_mode = S_IFREG | S_IWUSR;
2081         orp_ma->ma_attr.la_uid = ma->ma_attr.la_uid;
2082         orp_ma->ma_attr.la_gid = ma->ma_attr.la_gid;
2083         orp_ma->ma_attr.la_valid = LA_MODE | LA_UID | LA_GID;
2084         orp_ma->ma_lmm = ma->ma_lmm;
2085         orp_ma->ma_lmm_size = ma->ma_lmm_size;
2086         orp_ma->ma_valid = MA_INODE | MA_LOV;
2087         orphan = mdt_orphan_open(info, info->mti_mdt, &data->cd_fid, orp_ma,
2088                                  FMODE_WRITE);
2089         if (IS_ERR(orphan)) {
2090                 CERROR("%s: cannot open orphan file "DFID": rc = %ld\n",
2091                        mdt_obd_name(info->mti_mdt), PFID(&data->cd_fid),
2092                        PTR_ERR(orphan));
2093                 GOTO(out_unlock, rc = PTR_ERR(orphan));
2094         }
2095
2096         /* Set up HSM attribute for orphan object */
2097         CLASSERT(sizeof(struct hsm_attrs) <= sizeof(info->mti_xattr_buf));
2098         buf = &info->mti_buf;
2099         buf->lb_buf = info->mti_xattr_buf;
2100         buf->lb_len = sizeof(struct hsm_attrs);
2101         ma->ma_hsm.mh_flags |= HS_RELEASED;
2102         lustre_hsm2buf(buf->lb_buf, &ma->ma_hsm);
2103         ma->ma_hsm.mh_flags &= ~HS_RELEASED;
2104
2105         mdt_lock_reg_init(lh, LCK_EX);
2106         rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_LAYOUT |
2107                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
2108         if (rc != 0)
2109                 GOTO(out_close, rc);
2110
2111         rc = mo_xattr_set(info->mti_env, mdt_object_child(orphan), buf,
2112                           XATTR_NAME_HSM, 0);
2113
2114         if (rc == 0)
2115                 /* Swap layout with orphan object */
2116                 rc = mo_swap_layouts(info->mti_env, mdt_object_child(o),
2117                                      mdt_object_child(orphan),
2118                                      SWAP_LAYOUTS_MDS_HSM);
2119
2120         /* Release exclusive LL */
2121         mdt_object_unlock(info, o, lh, 1);
2122
2123         EXIT;
2124
2125 out_close:
2126         /* Close orphan object anyway */
2127         rc2 = mo_close(info->mti_env, mdt_object_child(orphan), orp_ma,
2128                        FMODE_WRITE);
2129         if (rc2 < 0)
2130                 CERROR("%s: error closing volatile file "DFID": rc = %d\n",
2131                        mdt_obd_name(info->mti_mdt), PFID(&data->cd_fid), rc2);
2132         LU_OBJECT_DEBUG(D_HSM, info->mti_env, &orphan->mot_obj,
2133                         "object closed\n");
2134         mdt_object_put(info->mti_env, orphan);
2135
2136 out_unlock:
2137         up_write(&o->mot_open_sem);
2138
2139         if (rc == 0) { /* already released */
2140                 struct mdt_body *repbody;
2141                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
2142                 LASSERT(repbody != NULL);
2143                 repbody->valid |= OBD_MD_FLRELEASED;
2144         }
2145
2146 out_reprocess:
2147         ldlm_reprocess_all(lease->l_resource);
2148         LDLM_LOCK_PUT(lease);
2149
2150         ma->ma_valid = 0;
2151         ma->ma_need = 0;
2152
2153         return rc;
2154 }
2155
2156 #define MFD_CLOSED(mode) (((mode) & ~(MDS_FMODE_EPOCH | MDS_FMODE_SOM | \
2157                                       MDS_FMODE_TRUNC)) == MDS_FMODE_CLOSED)
2158
2159 static int mdt_mfd_closed(struct mdt_file_data *mfd)
2160 {
2161         return ((mfd == NULL) || MFD_CLOSED(mfd->mfd_mode));
2162 }
2163
2164 int mdt_mfd_close(struct mdt_thread_info *info, struct mdt_file_data *mfd)
2165 {
2166         struct mdt_object *o = mfd->mfd_object;
2167         struct md_object *next = mdt_object_child(o);
2168         struct md_attr *ma = &info->mti_attr;
2169         int ret = MDT_IOEPOCH_CLOSED;
2170         int rc = 0;
2171         __u64 mode;
2172         ENTRY;
2173
2174         mode = mfd->mfd_mode;
2175
2176         if (ma->ma_attr_flags & MDS_HSM_RELEASE) {
2177                 rc = mdt_hsm_release(info, o, ma);
2178                 if (rc < 0) {
2179                         CDEBUG(D_HSM, "%s: File " DFID " release failed: %d\n",
2180                                 mdt_obd_name(info->mti_mdt),
2181                                 PFID(mdt_object_fid(o)), rc);
2182                         /* continue to close even error occurred. */
2183                 }
2184         }
2185
2186         if ((mode & FMODE_WRITE) || (mode & MDS_FMODE_TRUNC)) {
2187                 mdt_write_put(o);
2188                 ret = mdt_ioepoch_close(info, o);
2189         } else if (mode & MDS_FMODE_EXEC) {
2190                 mdt_write_allow(o);
2191         } else if (mode & MDS_FMODE_EPOCH) {
2192                 ret = mdt_ioepoch_close(info, o);
2193         } else if (mode & MDS_FMODE_SOM) {
2194                 ret = mdt_som_au_close(info, o);
2195         }
2196
2197         /* Update atime on close only. */
2198         if ((mode & MDS_FMODE_EXEC || mode & FMODE_READ || mode & FMODE_WRITE)
2199             && (ma->ma_valid & MA_INODE) && (ma->ma_attr.la_valid & LA_ATIME)) {
2200                 /* Set the atime only. */
2201                 ma->ma_valid = MA_INODE;
2202                 ma->ma_attr.la_valid = LA_ATIME;
2203                 rc = mo_attr_set(info->mti_env, next, ma);
2204         }
2205
2206         /* If file data is modified, add the dirty flag. */
2207         if (ma->ma_attr_flags & MDS_DATA_MODIFIED)
2208                 rc = mdt_add_dirty_flag(info, o, ma);
2209
2210         ma->ma_need |= MA_INODE;
2211         ma->ma_valid &= ~MA_INODE;
2212
2213         if (!MFD_CLOSED(mode))
2214                 rc = mo_close(info->mti_env, next, ma, mode);
2215
2216         if (ret == MDT_IOEPOCH_GETATTR || ret == MDT_IOEPOCH_OPENED) {
2217                 struct mdt_export_data *med;
2218
2219                 /* The IOepoch is still opened or SOM update is needed.
2220                  * Put mfd back into the list. */
2221                 LASSERT(mdt_conn_flags(info) & OBD_CONNECT_SOM);
2222                 mdt_mfd_set_mode(mfd, ret == MDT_IOEPOCH_OPENED ?
2223                                       MDS_FMODE_EPOCH : MDS_FMODE_SOM);
2224
2225                 LASSERT(mdt_info_req(info));
2226                 med = &mdt_info_req(info)->rq_export->exp_mdt_data;
2227                 spin_lock(&med->med_open_lock);
2228                 cfs_list_add(&mfd->mfd_list, &med->med_open_head);
2229                 class_handle_hash_back(&mfd->mfd_handle);
2230                 spin_unlock(&med->med_open_lock);
2231
2232                 if (ret == MDT_IOEPOCH_OPENED) {
2233                         ret = 0;
2234                 } else {
2235                         ret = -EAGAIN;
2236                         CDEBUG(D_INODE, "Size-on-MDS attribute update is "
2237                                "needed on "DFID"\n", PFID(mdt_object_fid(o)));
2238                 }
2239         } else {
2240                 /* adjust open and lease count */
2241                 if (mode & MDS_OPEN_LEASE) {
2242                         LASSERT(atomic_read(&o->mot_lease_count) > 0);
2243                         atomic_dec(&o->mot_lease_count);
2244                 }
2245                 LASSERT(atomic_read(&o->mot_open_count) > 0);
2246                 atomic_dec(&o->mot_open_count);
2247
2248                 mdt_mfd_free(mfd);
2249                 mdt_object_put(info->mti_env, o);
2250         }
2251
2252         RETURN(rc ? rc : ret);
2253 }
2254
2255 int mdt_close(struct tgt_session_info *tsi)
2256 {
2257         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
2258         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2259         struct mdt_export_data *med;
2260         struct mdt_file_data   *mfd;
2261         struct mdt_object      *o;
2262         struct md_attr         *ma = &info->mti_attr;
2263         struct mdt_body        *repbody = NULL;
2264         int rc, ret = 0;
2265         ENTRY;
2266
2267         mdt_counter_incr(req, LPROC_MDT_CLOSE);
2268         /* Close may come with the Size-on-MDS update. Unpack it. */
2269         rc = mdt_close_unpack(info);
2270         if (rc)
2271                 GOTO(out, rc = err_serious(rc));
2272
2273         LASSERT(info->mti_ioepoch);
2274
2275         req_capsule_set_size(info->mti_pill, &RMF_MDT_MD, RCL_SERVER,
2276                              info->mti_mdt->mdt_max_mdsize);
2277         req_capsule_set_size(info->mti_pill, &RMF_LOGCOOKIES, RCL_SERVER,
2278                              info->mti_mdt->mdt_max_cookiesize);
2279         rc = req_capsule_server_pack(info->mti_pill);
2280         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
2281                 mdt_client_compatibility(info);
2282                 if (rc == 0)
2283                         mdt_fix_reply(info);
2284                 mdt_exit_ucred(info);
2285                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
2286         }
2287
2288         /* Continue to close handle even if we can not pack reply */
2289         if (rc == 0) {
2290                 repbody = req_capsule_server_get(info->mti_pill,
2291                                                  &RMF_MDT_BODY);
2292                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
2293                                                     &RMF_MDT_MD);
2294                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
2295                                                        &RMF_MDT_MD,
2296                                                        RCL_SERVER);
2297                 ma->ma_cookie = req_capsule_server_get(info->mti_pill,
2298                                                        &RMF_LOGCOOKIES);
2299                 ma->ma_cookie_size = req_capsule_get_size(info->mti_pill,
2300                                                           &RMF_LOGCOOKIES,
2301                                                           RCL_SERVER);
2302                 ma->ma_need = MA_INODE | MA_LOV | MA_COOKIE;
2303                 repbody->eadatasize = 0;
2304                 repbody->aclsize = 0;
2305         } else {
2306                 rc = err_serious(rc);
2307         }
2308
2309         med = &req->rq_export->exp_mdt_data;
2310         spin_lock(&med->med_open_lock);
2311         mfd = mdt_handle2mfd(med, &info->mti_ioepoch->handle,
2312                              req_is_replay(req));
2313         if (mdt_mfd_closed(mfd)) {
2314                 spin_unlock(&med->med_open_lock);
2315                 CDEBUG(D_INODE, "no handle for file close: fid = "DFID
2316                        ": cookie = "LPX64"\n", PFID(info->mti_rr.rr_fid1),
2317                        info->mti_ioepoch->handle.cookie);
2318                 /** not serious error since bug 3633 */
2319                 rc = -ESTALE;
2320         } else {
2321                 class_handle_unhash(&mfd->mfd_handle);
2322                 cfs_list_del_init(&mfd->mfd_list);
2323                 spin_unlock(&med->med_open_lock);
2324
2325                 /* Do not lose object before last unlink. */
2326                 o = mfd->mfd_object;
2327                 mdt_object_get(info->mti_env, o);
2328                 ret = mdt_mfd_close(info, mfd);
2329                 if (repbody != NULL)
2330                         rc = mdt_handle_last_unlink(info, o, ma);
2331                 mdt_empty_transno(info, rc);
2332                 mdt_object_put(info->mti_env, o);
2333         }
2334         if (repbody != NULL) {
2335                 mdt_client_compatibility(info);
2336                 rc = mdt_fix_reply(info);
2337         }
2338
2339         mdt_exit_ucred(info);
2340         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK))
2341                 GOTO(out, rc = err_serious(-ENOMEM));
2342
2343         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_CLOSE_NET_REP,
2344                                  OBD_FAIL_MDS_CLOSE_NET_REP))
2345                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_CLOSE_NET_REP;
2346 out:
2347         mdt_thread_info_fini(info);
2348         RETURN(rc ? rc : ret);
2349 }
2350
2351 /**
2352  * DONE_WRITING rpc handler.
2353  *
2354  * As mfd is not kept after replayed CLOSE (see mdt_ioepoch_close_on_replay()),
2355  * only those DONE_WRITING rpc will be replayed which really wrote smth on disk,
2356  * and got a trasid. Waiting for such DONE_WRITING is not reliable, so just
2357  * skip attributes and reconstruct the reply here.
2358  */
2359 int mdt_done_writing(struct tgt_session_info *tsi)
2360 {
2361         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2362         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
2363         struct mdt_body         *repbody = NULL;
2364         struct mdt_export_data  *med;
2365         struct mdt_file_data    *mfd;
2366         int rc;
2367         ENTRY;
2368
2369         rc = req_capsule_server_pack(tsi->tsi_pill);
2370         if (rc)
2371                 GOTO(out, rc = err_serious(rc));
2372
2373         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
2374         repbody->eadatasize = 0;
2375         repbody->aclsize = 0;
2376
2377         /* Done Writing may come with the Size-on-MDS update. Unpack it. */
2378         rc = mdt_close_unpack(info);
2379         if (rc)
2380                 GOTO(out, rc = err_serious(rc));
2381
2382         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
2383                 mdt_exit_ucred(info);
2384                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
2385         }
2386
2387         med = &info->mti_exp->exp_mdt_data;
2388         spin_lock(&med->med_open_lock);
2389         mfd = mdt_handle2mfd(med, &info->mti_ioepoch->handle,
2390                              req_is_replay(req));
2391         if (mfd == NULL) {
2392                 spin_unlock(&med->med_open_lock);
2393                 CDEBUG(D_INODE, "no handle for done write: fid = "DFID
2394                        ": cookie = "LPX64" ioepoch = "LPU64"\n",
2395                        PFID(info->mti_rr.rr_fid1),
2396                        info->mti_ioepoch->handle.cookie,
2397                        info->mti_ioepoch->ioepoch);
2398                 /* If this is a replay, reconstruct the transno. */
2399                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
2400                         rc = info->mti_ioepoch->flags & MF_SOM_AU ?
2401                              -EAGAIN : 0;
2402                         mdt_empty_transno(info, rc);
2403                 } else
2404                         rc = -ESTALE;
2405                 GOTO(error_ucred, rc);
2406         }
2407
2408         LASSERT(mfd->mfd_mode == MDS_FMODE_EPOCH ||
2409                 mfd->mfd_mode == MDS_FMODE_TRUNC);
2410         class_handle_unhash(&mfd->mfd_handle);
2411         cfs_list_del_init(&mfd->mfd_list);
2412         spin_unlock(&med->med_open_lock);
2413
2414         /* Set EPOCH CLOSE flag if not set by client. */
2415         info->mti_ioepoch->flags |= MF_EPOCH_CLOSE;
2416         info->mti_attr.ma_valid = 0;
2417
2418         info->mti_attr.ma_lmm_size = info->mti_mdt->mdt_max_mdsize;
2419         OBD_ALLOC_LARGE(info->mti_attr.ma_lmm, info->mti_mdt->mdt_max_mdsize);
2420         if (info->mti_attr.ma_lmm == NULL)
2421                 GOTO(error_ucred, rc = -ENOMEM);
2422
2423         rc = mdt_mfd_close(info, mfd);
2424
2425         OBD_FREE_LARGE(info->mti_attr.ma_lmm, info->mti_mdt->mdt_max_mdsize);
2426         mdt_empty_transno(info, rc);
2427 error_ucred:
2428         mdt_exit_ucred(info);
2429 out:
2430         mdt_thread_info_fini(info);
2431         RETURN(rc);
2432 }