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, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * 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(void)
  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                 CFS_INIT_LIST_HEAD(&mfd->mfd_list);
  70                 class_handle_hash(&mfd->mfd_handle, &mfd_handle_ops);
  71         }
  72         RETURN(mfd);
  73 }
  74
  75 /*
  76  * Find the mfd pointed to by handle in global hash table.
  77  * In case of replay the handle is obsoleted
  78  * but mfd can be found in mfd list by that handle
  79  */
  80 struct mdt_file_data *mdt_handle2mfd(struct mdt_thread_info *info,
  81                                      const struct lustre_handle *handle)
  82 {
  83         struct ptlrpc_request *req = mdt_info_req(info);
  84         struct mdt_file_data  *mfd;
  85         ENTRY;
  86
  87         LASSERT(handle != NULL);
  88         mfd = class_handle2object(handle->cookie);
  89         /* during dw/setattr replay the mfd can be found by old handle */
  90         if (mfd == NULL && req_is_replay(req)) {
  91                 struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
  92                 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
  93                         if (mfd->mfd_old_handle.cookie == handle->cookie)
  94                                 RETURN (mfd);
  95                 }
  96                 mfd = NULL;
  97         }
  98         RETURN (mfd);
  99 }
 100
 101 /* free mfd */
 102 void mdt_mfd_free(struct mdt_file_data *mfd)
 103 {
 104         LASSERT(cfs_list_empty(&mfd->mfd_list));
 105         OBD_FREE_RCU(mfd, sizeof *mfd, &mfd->mfd_handle);
 106 }
 107
 108 static int mdt_create_data(struct mdt_thread_info *info,
 109                            struct mdt_object *p, struct mdt_object *o)
 110 {
 111         struct md_op_spec     *spec = &info->mti_spec;
 112         struct md_attr        *ma   = &info->mti_attr;
 113         int                    rc   = 0;
 114         ENTRY;
 115
 116         if (!md_should_create(spec->sp_cr_flags))
 117                 RETURN(0);
 118
 119         ma->ma_need = MA_INODE | MA_LOV;
 120         ma->ma_valid = 0;
 121         mutex_lock(&o->mot_lov_mutex);
 122         if (!(o->mot_flags & MOF_LOV_CREATED)) {
 123                 rc = mdo_create_data(info->mti_env,
 124                                      p ? mdt_object_child(p) : NULL,
 125                                      mdt_object_child(o), spec, ma);
 126                 if (rc == 0)
 127                         rc = mdt_attr_get_complex(info, o, ma);
 128
 129                 if (rc == 0 && ma->ma_valid & MA_LOV)
 130                         o->mot_flags |= MOF_LOV_CREATED;
 131         }
 132         mutex_unlock(&o->mot_lov_mutex);
 133         RETURN(rc);
 134 }
 135
 136 static int mdt_ioepoch_opened(struct mdt_object *mo)
 137 {
 138         return mo->mot_ioepoch_count;
 139 }
 140
 141 int mdt_object_is_som_enabled(struct mdt_object *mo)
 142 {
 143         return !mo->mot_ioepoch;
 144 }
 145
 146 /**
 147  * Re-enable Size-on-MDS.
 148  * Call under ->mot_ioepoch_mutex.
 149  */
 150 static void mdt_object_som_enable(struct mdt_object *mo, __u64 ioepoch)
 151 {
 152         if (ioepoch == mo->mot_ioepoch) {
 153                 LASSERT(!mdt_ioepoch_opened(mo));
 154                 mo->mot_ioepoch = 0;
 155                 mo->mot_flags = 0;
 156         }
 157 }
 158
 159 /**
 160  * Open the IOEpoch. It is allowed if @writecount is not negative.
 161  * The epoch and writecount handling is performed under the mot_ioepoch_mutex.
 162  */
 163 int mdt_ioepoch_open(struct mdt_thread_info *info, struct mdt_object *o,
 164                      int created)
 165 {
 166         struct mdt_device *mdt = info->mti_mdt;
 167         int cancel = 0;
 168         int rc = 0;
 169         ENTRY;
 170
 171         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 172             !S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
 173                 RETURN(0);
 174
 175         mutex_lock(&o->mot_ioepoch_mutex);
 176         if (mdt_ioepoch_opened(o)) {
 177                 /* Epoch continues even if there is no writers yet. */
 178                 CDEBUG(D_INODE, "continue epoch "LPU64" for "DFID"\n",
 179                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 180         } else {
 181                 /* XXX: ->mdt_ioepoch is not initialized at the mount */
 182                 spin_lock(&mdt->mdt_ioepoch_lock);
 183                 if (mdt->mdt_ioepoch < info->mti_replayepoch)
 184                         mdt->mdt_ioepoch = info->mti_replayepoch;
 185
 186                 if (info->mti_replayepoch)
 187                         o->mot_ioepoch = info->mti_replayepoch;
 188                 else if (++mdt->mdt_ioepoch == IOEPOCH_INVAL)
 189                         o->mot_ioepoch = ++mdt->mdt_ioepoch;
 190                 else
 191                         o->mot_ioepoch = mdt->mdt_ioepoch;
 192
 193                 spin_unlock(&mdt->mdt_ioepoch_lock);
 194
 195                 CDEBUG(D_INODE, "starting epoch "LPU64" for "DFID"\n",
 196                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 197                 if (created)
 198                         o->mot_flags |= MOF_SOM_CREATED;
 199                 cancel = 1;
 200         }
 201         o->mot_ioepoch_count++;
 202         mutex_unlock(&o->mot_ioepoch_mutex);
 203
 204         /* Cancel Size-on-MDS attributes cached on clients for the open case.
 205          * In the truncate case, see mdt_reint_setattr(). */
 206         if (cancel && (info->mti_rr.rr_fid1 != NULL)) {
 207                 struct mdt_lock_handle  *lh = &info->mti_lh[MDT_LH_CHILD];
 208                 mdt_lock_reg_init(lh, LCK_EX);
 209                 rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_UPDATE,
 210                                      MDT_LOCAL_LOCK);
 211                 if (rc == 0)
 212                         mdt_object_unlock(info, o, lh, 1);
 213         }
 214         RETURN(rc);
 215 }
 216
 217 /**
 218  * Update SOM on-disk attributes.
 219  * If enabling, write update inodes and lustre-ea with the proper IOEpoch,
 220  * mountid and attributes. If disabling, clean SOM xattr.
 221  * Call under ->mot_ioepoch_mutex.
 222  */
 223 static int mdt_som_attr_set(struct mdt_thread_info *info,
 224                             struct mdt_object *obj, __u64 ioepoch, bool enable)
 225 {
 226         struct md_object        *next = mdt_object_child(obj);
 227         int                      rc;
 228         ENTRY;
 229
 230         CDEBUG(D_INODE, "Size-on-MDS attribute %s for epoch "LPU64
 231                " on "DFID".\n", enable ? "update" : "disabling",
 232                ioepoch, PFID(mdt_object_fid(obj)));
 233
 234         if (enable) {
 235                 struct lu_buf           *buf = &info->mti_buf;
 236                 struct som_attrs        *attrs;
 237                 struct md_attr          *ma = &info->mti_attr;
 238                 struct lu_attr          *la = &ma->ma_attr;
 239                 struct obd_device       *obd = info->mti_mdt->mdt_lut.lut_obd;
 240
 241                 attrs = (struct som_attrs *)info->mti_xattr_buf;
 242                 CLASSERT(sizeof(info->mti_xattr_buf) >= sizeof(*attrs));
 243
 244                 /* pack SOM attributes */
 245                 memset(attrs, 0, sizeof(*attrs));
 246                 attrs->som_ioepoch = ioepoch;
 247                 attrs->som_mountid = obd->u.obt.obt_mount_count;
 248                 if ((la->la_valid & LA_SIZE) != 0)
 249                         attrs->som_size = la->la_size;
 250                 if ((la->la_valid & LA_BLOCKS) != 0)
 251                         attrs->som_blocks = la->la_blocks;
 252                 lustre_som_swab(attrs);
 253
 254                 /* update SOM attributes */
 255                 buf->lb_buf = attrs;
 256                 buf->lb_len = sizeof(*attrs);
 257                 rc = mo_xattr_set(info->mti_env, next, buf, XATTR_NAME_SOM, 0);
 258         } else {
 259                 /* delete SOM attributes */
 260                 rc = mo_xattr_del(info->mti_env, next, XATTR_NAME_SOM);
 261         }
 262
 263         RETURN(rc);
 264 }
 265
 266 /** Perform the eviction specific actions on ioepoch close. */
 267 static inline int mdt_ioepoch_close_on_eviction(struct mdt_thread_info *info,
 268                                                 struct mdt_object *o)
 269 {
 270         int rc = 0;
 271
 272         mutex_lock(&o->mot_ioepoch_mutex);
 273         CDEBUG(D_INODE, "Eviction. Closing IOepoch "LPU64" on "DFID". "
 274                "Count %d\n", o->mot_ioepoch, PFID(mdt_object_fid(o)),
 275                o->mot_ioepoch_count);
 276         o->mot_ioepoch_count--;
 277
 278         /* If eviction occured set MOF_SOM_RECOV,
 279          * if no other epoch holders, disable SOM on disk. */
 280         o->mot_flags |= MOF_SOM_CHANGE | MOF_SOM_RECOV;
 281         if (!mdt_ioepoch_opened(o)) {
 282                 rc = mdt_som_attr_set(info, o, o->mot_ioepoch, MDT_SOM_DISABLE);
 283                 mdt_object_som_enable(o, o->mot_ioepoch);
 284         }
 285         mutex_unlock(&o->mot_ioepoch_mutex);
 286         RETURN(rc);
 287 }
 288
 289 /**
 290  * Perform the replay specific actions on ioepoch close.
 291  * Skip SOM attribute update if obtained and just forget about the inode state
 292  * for the last ioepoch holder. The SOM cache is invalidated on MDS failure.
 293  */
 294 static inline int mdt_ioepoch_close_on_replay(struct mdt_thread_info *info,
 295                                               struct mdt_object *o)
 296 {
 297         int rc = MDT_IOEPOCH_CLOSED;
 298         ENTRY;
 299
 300         mutex_lock(&o->mot_ioepoch_mutex);
 301         CDEBUG(D_INODE, "Replay. Closing epoch "LPU64" on "DFID". Count %d\n",
 302                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 303         o->mot_ioepoch_count--;
 304
 305         /* Get an info from the replayed request if client is supposed
 306          * to send an Attibute Update, reconstruct @rc if so */
 307         if (info->mti_ioepoch->flags & MF_SOM_AU)
 308                 rc = MDT_IOEPOCH_GETATTR;
 309
 310         if (!mdt_ioepoch_opened(o))
 311                 mdt_object_som_enable(o, info->mti_ioepoch->ioepoch);
 312         mutex_unlock(&o->mot_ioepoch_mutex);
 313
 314         RETURN(rc);
 315 }
 316
 317 /**
 318  * Regular file IOepoch close.
 319  * Closes the ioepoch, checks the object state, apply obtained attributes and
 320  * re-enable SOM on the object, if possible. Also checks if the recovery is
 321  * needed and packs OBD_MD_FLGETATTRLOCK flag into the reply to force the client
 322  * to obtain SOM attributes under the server-side OST locks.
 323  *
 324  * Return value:
 325  * MDT_IOEPOCH_CLOSED if ioepoch is closed.
 326  * MDT_IOEPOCH_GETATTR if ioepoch is closed but another SOM update is needed.
 327  */
 328 static inline int mdt_ioepoch_close_reg(struct mdt_thread_info *info,
 329                                         struct mdt_object *o)
 330 {
 331         struct md_attr *tmp_ma;
 332         struct lu_attr *la;
 333         int achange, opened;
 334         int recovery = 0;
 335         int rc = 0, ret = MDT_IOEPOCH_CLOSED;
 336         ENTRY;
 337
 338         la = &info->mti_attr.ma_attr;
 339         achange = (info->mti_ioepoch->flags & MF_SOM_CHANGE);
 340
 341         mutex_lock(&o->mot_ioepoch_mutex);
 342         o->mot_ioepoch_count--;
 343
 344         tmp_ma = &info->mti_u.som.attr;
 345         tmp_ma->ma_lmm = info->mti_attr.ma_lmm;
 346         tmp_ma->ma_lmm_size = info->mti_attr.ma_lmm_size;
 347         tmp_ma->ma_som = &info->mti_u.som.data;
 348         tmp_ma->ma_need = MA_INODE | MA_LOV | MA_SOM;
 349         tmp_ma->ma_valid = 0;
 350         rc = mdt_attr_get_complex(info, o, tmp_ma);
 351         if (rc)
 352                 GOTO(error_up, rc);
 353
 354         /* Check the on-disk SOM state. */
 355         if (o->mot_flags & MOF_SOM_RECOV)
 356                 recovery = 1;
 357         else if (!(o->mot_flags & MOF_SOM_CREATED) &&
 358                  !(tmp_ma->ma_valid & MA_SOM))
 359                 recovery = 1;
 360
 361         CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
 362                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 363
 364         opened = mdt_ioepoch_opened(o);
 365         /**
 366          * If IOEpoch is not opened, check if a Size-on-MDS update is needed.
 367          * Skip the check for file with no LOV  or for unlink files.
 368          */
 369         if (!opened && tmp_ma->ma_valid & MA_LOV &&
 370             !(tmp_ma->ma_valid & MA_INODE && tmp_ma->ma_attr.la_nlink == 0)) {
 371                 if (recovery)
 372                         /* If some previous writer was evicted, re-ask the
 373                          * client for attributes. Even if attributes are
 374                          * provided, we cannot believe in them.
 375                          * Another use case is that there is no SOM cache on
 376                          * disk -- first access with SOM or there was an MDS
 377                          * failure. */
 378                         ret = MDT_IOEPOCH_GETATTR;
 379                 else if (o->mot_flags & MOF_SOM_CHANGE)
 380                         /* Some previous writer changed the attribute.
 381                          * Do not believe to the current Size-on-MDS
 382                          * update, re-ask client. */
 383                         ret = MDT_IOEPOCH_GETATTR;
 384                 else if (!(la->la_valid & LA_SIZE) && achange)
 385                         /* Attributes were changed by the last writer
 386                          * only but no Size-on-MDS update is received.*/
 387                         ret = MDT_IOEPOCH_GETATTR;
 388         }
 389
 390         if (achange || ret == MDT_IOEPOCH_GETATTR)
 391                 o->mot_flags |= MOF_SOM_CHANGE;
 392
 393         /* If epoch ends and relable SOM attributes are obtained, update them.
 394          * Create SOM ea for new files even if there is no attributes obtained
 395          * (0-length file). */
 396         if (ret == MDT_IOEPOCH_CLOSED && !opened) {
 397                 if (achange || o->mot_flags & MOF_SOM_CREATED) {
 398                         LASSERT(achange || !(la->la_valid & LA_SIZE));
 399                         rc = mdt_som_attr_set(info, o, o->mot_ioepoch,
 400                                               MDT_SOM_ENABLE);
 401                         /* Avoid the following setattrs of these attributes,
 402                          * e.g. for atime update. */
 403                         info->mti_attr.ma_valid = 0;
 404                 }
 405                 mdt_object_som_enable(o, o->mot_ioepoch);
 406         }
 407
 408         mutex_unlock(&o->mot_ioepoch_mutex);
 409         /* If recovery is needed, tell the client to perform GETATTR under
 410          * the lock. */
 411         if (ret == MDT_IOEPOCH_GETATTR && recovery) {
 412                 struct mdt_body *rep;
 413                 rep = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 414                 rep->valid |= OBD_MD_FLGETATTRLOCK;
 415         }
 416
 417         RETURN(rc ? : ret);
 418
 419 error_up:
 420         mutex_unlock(&o->mot_ioepoch_mutex);
 421         return rc;
 422 }
 423
 424 /**
 425  * Close IOEpoch (opened file or MDS_FMODE_EPOCH state). It happens if:
 426  * - a client closes the IOEpoch;
 427  * - a client eviction occured.
 428  * Return values:
 429  * MDT_IOEPOCH_OPENED if the client does not close IOEpoch.
 430  * MDT_IOEPOCH_CLOSED if the client closes IOEpoch.
 431  * MDT_IOEPOCH_GETATTR if the client closes IOEpoch but another SOM attribute
 432  * update is needed.
 433  */
 434 static int mdt_ioepoch_close(struct mdt_thread_info *info, struct mdt_object *o)
 435 {
 436         struct ptlrpc_request *req = mdt_info_req(info);
 437         ENTRY;
 438
 439         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 440             !S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
 441                 RETURN(0);
 442
 443         LASSERT(o->mot_ioepoch_count);
 444         LASSERT(info->mti_ioepoch == NULL ||
 445                 info->mti_ioepoch->ioepoch == o->mot_ioepoch);
 446
 447         /* IOEpoch is closed only if client tells about it or eviction occures.
 448          * In the replay case, always close the epoch. */
 449         if (req == NULL)
 450                 RETURN(mdt_ioepoch_close_on_eviction(info, o));
 451         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
 452                 RETURN(mdt_ioepoch_close_on_replay(info, o));
 453         if (info->mti_ioepoch->flags & MF_EPOCH_CLOSE)
 454                 RETURN(mdt_ioepoch_close_reg(info, o));
 455         /* IO epoch is not closed. */
 456         RETURN(MDT_IOEPOCH_OPENED);
 457 }
 458
 459 /**
 460  * Close MDS_FMODE_SOM state, when IOEpoch is already closed and we are waiting
 461  * for attribute update. It happens if:
 462  * - SOM Attribute Update is obtained;
 463  * - the client failed to obtain it and informs MDS about it;
 464  * - a client eviction occured.
 465  * Apply obtained attributes for the 1st case, wipe out the on-disk SOM
 466  * cache otherwise.
 467  */
 468 int mdt_som_au_close(struct mdt_thread_info *info, struct mdt_object *o)
 469 {
 470         struct ptlrpc_request *req = mdt_info_req(info);
 471         __u64 ioepoch = 0;
 472         int act = MDT_SOM_ENABLE;
 473         int rc = 0;
 474         ENTRY;
 475
 476         LASSERT(!req || info->mti_ioepoch);
 477         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 478             !S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
 479                 RETURN(0);
 480
 481         /* No size whereas MF_SOM_CHANGE is set means client failed to
 482          * obtain ost attributes, drop the SOM cache on disk if so. */
 483         if (!req ||
 484             (info->mti_ioepoch &&
 485              info->mti_ioepoch->flags & MF_SOM_CHANGE &&
 486              !(info->mti_attr.ma_attr.la_valid & LA_SIZE)))
 487                 act = MDT_SOM_DISABLE;
 488
 489         mutex_lock(&o->mot_ioepoch_mutex);
 490         /* Mark the object it is the recovery state if we failed to obtain
 491          * SOM attributes. */
 492         if (act == MDT_SOM_DISABLE)
 493                 o->mot_flags |= MOF_SOM_RECOV;
 494
 495         if (!mdt_ioepoch_opened(o)) {
 496                 ioepoch =  info->mti_ioepoch ?
 497                         info->mti_ioepoch->ioepoch : o->mot_ioepoch;
 498
 499                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 500                         rc = mdt_som_attr_set(info, o, ioepoch, act);
 501                 mdt_object_som_enable(o, ioepoch);
 502         }
 503         mutex_unlock(&o->mot_ioepoch_mutex);
 504         RETURN(rc);
 505 }
 506
 507 int mdt_write_read(struct mdt_object *o)
 508 {
 509         int rc = 0;
 510         ENTRY;
 511         mutex_lock(&o->mot_ioepoch_mutex);
 512         rc = o->mot_writecount;
 513         mutex_unlock(&o->mot_ioepoch_mutex);
 514         RETURN(rc);
 515 }
 516
 517 int mdt_write_get(struct mdt_object *o)
 518 {
 519         int rc = 0;
 520         ENTRY;
 521         mutex_lock(&o->mot_ioepoch_mutex);
 522         if (o->mot_writecount < 0)
 523                 rc = -ETXTBSY;
 524         else
 525                 o->mot_writecount++;
 526         mutex_unlock(&o->mot_ioepoch_mutex);
 527         RETURN(rc);
 528 }
 529
 530 void mdt_write_put(struct mdt_object *o)
 531 {
 532         ENTRY;
 533         mutex_lock(&o->mot_ioepoch_mutex);
 534         o->mot_writecount--;
 535         mutex_unlock(&o->mot_ioepoch_mutex);
 536         EXIT;
 537 }
 538
 539 static int mdt_write_deny(struct mdt_object *o)
 540 {
 541         int rc = 0;
 542         ENTRY;
 543         mutex_lock(&o->mot_ioepoch_mutex);
 544         if (o->mot_writecount > 0)
 545                 rc = -ETXTBSY;
 546         else
 547                 o->mot_writecount--;
 548         mutex_unlock(&o->mot_ioepoch_mutex);
 549         RETURN(rc);
 550 }
 551
 552 static void mdt_write_allow(struct mdt_object *o)
 553 {
 554         ENTRY;
 555         mutex_lock(&o->mot_ioepoch_mutex);
 556         o->mot_writecount++;
 557         mutex_unlock(&o->mot_ioepoch_mutex);
 558         EXIT;
 559 }
 560
 561 /* there can be no real transaction so prepare the fake one */
 562 static void mdt_empty_transno(struct mdt_thread_info *info, int rc)
 563 {
 564         struct mdt_device      *mdt = info->mti_mdt;
 565         struct ptlrpc_request  *req = mdt_info_req(info);
 566         struct tg_export_data  *ted;
 567         struct lsd_client_data *lcd;
 568
 569         ENTRY;
 570         /* transaction has occurred already */
 571         if (lustre_msg_get_transno(req->rq_repmsg) != 0)
 572                 RETURN_EXIT;
 573
 574         spin_lock(&mdt->mdt_lut.lut_translock);
 575         if (rc != 0) {
 576                 if (info->mti_transno != 0) {
 577                         struct obd_export *exp = req->rq_export;
 578
 579                         CERROR("%s: replay trans "LPU64" NID %s: rc = %d\n",
 580                                 mdt->mdt_md_dev.md_lu_dev.ld_obd->obd_name,
 581                                 info->mti_transno,
 582                                 libcfs_nid2str(exp->exp_connection->c_peer.nid),
 583                                 rc);
 584                         RETURN_EXIT;
 585                 }
 586         } else if (info->mti_transno == 0) {
 587                 info->mti_transno = ++mdt->mdt_lut.lut_last_transno;
 588         } else {
 589                 /* should be replay */
 590                 if (info->mti_transno > mdt->mdt_lut.lut_last_transno)
 591                         mdt->mdt_lut.lut_last_transno = info->mti_transno;
 592         }
 593         spin_unlock(&mdt->mdt_lut.lut_translock);
 594
 595         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 596                         info->mti_transno,
 597                         req->rq_export->exp_obd->obd_last_committed);
 598
 599         req->rq_transno = info->mti_transno;
 600         lustre_msg_set_transno(req->rq_repmsg, info->mti_transno);
 601
 602         /* update lcd in memory only for resent cases */
 603         ted = &req->rq_export->exp_target_data;
 604         LASSERT(ted);
 605         mutex_lock(&ted->ted_lcd_lock);
 606         lcd = ted->ted_lcd;
 607         if (info->mti_transno < lcd->lcd_last_transno &&
 608             info->mti_transno != 0) {
 609                 /* This should happen during replay. Do not update
 610                  * last rcvd info if replay req transno < last transno,
 611                  * otherwise the following resend(after replay) can not
 612                  * be checked correctly by xid */
 613                 mutex_unlock(&ted->ted_lcd_lock);
 614                 CDEBUG(D_HA, "%s: transno = "LPU64" < last_transno = "LPU64"\n",
 615                         mdt->mdt_md_dev.md_lu_dev.ld_obd->obd_name,
 616                         info->mti_transno, lcd->lcd_last_transno);
 617                 RETURN_EXIT;
 618         }
 619
 620         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 621             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 622                 if (info->mti_transno != 0)
 623                         lcd->lcd_last_close_transno = info->mti_transno;
 624                 lcd->lcd_last_close_xid = req->rq_xid;
 625                 lcd->lcd_last_close_result = rc;
 626         } else {
 627                 /* VBR: save versions in last_rcvd for reconstruct. */
 628                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 629                 if (pre_versions) {
 630                         lcd->lcd_pre_versions[0] = pre_versions[0];
 631                         lcd->lcd_pre_versions[1] = pre_versions[1];
 632                         lcd->lcd_pre_versions[2] = pre_versions[2];
 633                         lcd->lcd_pre_versions[3] = pre_versions[3];
 634                 }
 635                 if (info->mti_transno != 0)
 636                         lcd->lcd_last_transno = info->mti_transno;
 637
 638                 lcd->lcd_last_xid = req->rq_xid;
 639                 lcd->lcd_last_result = rc;
 640                 lcd->lcd_last_data = info->mti_opdata;
 641         }
 642         mutex_unlock(&ted->ted_lcd_lock);
 643
 644         EXIT;
 645 }
 646
 647 void mdt_mfd_set_mode(struct mdt_file_data *mfd, int mode)
 648 {
 649         LASSERT(mfd != NULL);
 650
 651         CDEBUG(D_HA, "Change mfd %p mode 0x%x->0x%x\n",
 652                mfd, (unsigned int)mfd->mfd_mode, (unsigned int)mode);
 653
 654         mfd->mfd_mode = mode;
 655 }
 656
 657 static int mdt_mfd_open(struct mdt_thread_info *info, struct mdt_object *p,
 658                         struct mdt_object *o, __u64 flags, int created)
 659 {
 660         struct ptlrpc_request   *req = mdt_info_req(info);
 661         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 662         struct mdt_file_data    *mfd;
 663         struct md_attr          *ma  = &info->mti_attr;
 664         struct lu_attr          *la  = &ma->ma_attr;
 665         struct mdt_body         *repbody;
 666         int                      rc = 0, isdir, isreg;
 667         ENTRY;
 668
 669         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 670
 671         isreg = S_ISREG(la->la_mode);
 672         isdir = S_ISDIR(la->la_mode);
 673         if (isreg && !(ma->ma_valid & MA_LOV)) {
 674                 /*
 675                  * No EA, check whether it is will set regEA and dirEA since in
 676                  * above attr get, these size might be zero, so reset it, to
 677                  * retrieve the MD after create obj.
 678                  */
 679                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 680                                                        &RMF_MDT_MD,
 681                                                        RCL_SERVER);
 682                 /* in replay case, p == NULL */
 683                 rc = mdt_create_data(info, p, o);
 684                 if (rc)
 685                         RETURN(rc);
 686         }
 687
 688         CDEBUG(D_INODE, "after open, ma_valid bit = "LPX64" lmm_size = %d\n",
 689                ma->ma_valid, ma->ma_lmm_size);
 690
 691         if (ma->ma_valid & MA_LOV) {
 692                 LASSERT(ma->ma_lmm_size != 0);
 693                 repbody->eadatasize = ma->ma_lmm_size;
 694                 if (isdir)
 695                         repbody->valid |= OBD_MD_FLDIREA;
 696                 else
 697                         repbody->valid |= OBD_MD_FLEASIZE;
 698         }
 699
 700         if (flags & FMODE_WRITE) {
 701                 rc = mdt_write_get(o);
 702                 if (rc == 0) {
 703                         mdt_ioepoch_open(info, o, created);
 704                         repbody->ioepoch = o->mot_ioepoch;
 705                 }
 706         } else if (flags & MDS_FMODE_EXEC) {
 707                 /* if file is released, we can't deny write because we must
 708                  * restore (write) it to access it.*/
 709                 if ((ma->ma_valid & MA_HSM) &&
 710                     (ma->ma_hsm.mh_flags & HS_RELEASED))
 711                         rc = 0;
 712                 else
 713                         rc = mdt_write_deny(o);
 714         }
 715         if (rc)
 716                 RETURN(rc);
 717
 718         rc = mo_open(info->mti_env, mdt_object_child(o),
 719                      created ? flags | MDS_OPEN_CREATED : flags);
 720         if (rc)
 721                 GOTO(err_out, rc);
 722
 723         mfd = mdt_mfd_new();
 724         if (mfd != NULL) {
 725                 /*
 726                  * Keep a reference on this object for this open, and is
 727                  * released by mdt_mfd_close().
 728                  */
 729                 mdt_object_get(info->mti_env, o);
 730
 731                 /*
 732                  * @flags is always not zero. At least it should be FMODE_READ,
 733                  * FMODE_WRITE or MDS_FMODE_EXEC.
 734                  */
 735                 LASSERT(flags != 0);
 736
 737                 /* Open handling. */
 738                 mdt_mfd_set_mode(mfd, flags);
 739
 740                 mfd->mfd_object = o;
 741                 mfd->mfd_xid = req->rq_xid;
 742
 743                 /* replay handle */
 744                 if (req_is_replay(req)) {
 745                         struct mdt_file_data *old_mfd;
 746                         /* Check wheather old cookie already exist in
 747                          * the list, becasue when do recovery, client
 748                          * might be disconnected from server, and
 749                          * restart replay, so there maybe some orphan
 750                          * mfd here, we should remove them */
 751                         LASSERT(info->mti_rr.rr_handle != NULL);
 752                         old_mfd = mdt_handle2mfd(info, info->mti_rr.rr_handle);
 753                         if (old_mfd) {
 754                                 CDEBUG(D_HA, "del orph mfd %p fid=("DFID") "
 755                                        "cookie=" LPX64"\n", mfd,
 756                                        PFID(mdt_object_fid(mfd->mfd_object)),
 757                                        info->mti_rr.rr_handle->cookie);
 758                                 spin_lock(&med->med_open_lock);
 759                                 class_handle_unhash(&old_mfd->mfd_handle);
 760                                 cfs_list_del_init(&old_mfd->mfd_list);
 761                                 spin_unlock(&med->med_open_lock);
 762                                 /* no attr update for that close */
 763                                 la->la_valid = 0;
 764                                 ma->ma_valid |= MA_FLAGS;
 765                                 ma->ma_attr_flags |= MDS_RECOV_OPEN;
 766                                 mdt_mfd_close(info, old_mfd);
 767                                 ma->ma_attr_flags &= ~MDS_RECOV_OPEN;
 768                                 ma->ma_valid &= ~MA_FLAGS;
 769                         }
 770                         CDEBUG(D_HA, "Store old cookie "LPX64" in new mfd\n",
 771                                info->mti_rr.rr_handle->cookie);
 772                         mfd->mfd_old_handle.cookie =
 773                                                 info->mti_rr.rr_handle->cookie;
 774                 }
 775                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 776
 777                 if (req->rq_export->exp_disconnected) {
 778                         spin_lock(&med->med_open_lock);
 779                         class_handle_unhash(&mfd->mfd_handle);
 780                         cfs_list_del_init(&mfd->mfd_list);
 781                         spin_unlock(&med->med_open_lock);
 782                         mdt_mfd_close(info, mfd);
 783                 } else {
 784                         spin_lock(&med->med_open_lock);
 785                         cfs_list_add(&mfd->mfd_list, &med->med_open_head);
 786                         spin_unlock(&med->med_open_lock);
 787                 }
 788
 789                 mdt_empty_transno(info, rc);
 790         } else {
 791                 GOTO(err_out, rc = -ENOMEM);
 792         }
 793
 794         RETURN(rc);
 795
 796 err_out:
 797         if (flags & FMODE_WRITE)
 798                         /* XXX We also need to close io epoch here.
 799                          * See LU-1220 - green */
 800                 mdt_write_put(o);
 801         else if (flags & FMODE_EXEC)
 802                 mdt_write_allow(o);
 803         return rc;
 804 }
 805
 806 int mdt_finish_open(struct mdt_thread_info *info,
 807                     struct mdt_object *p, struct mdt_object *o,
 808                     __u64 flags, int created, struct ldlm_reply *rep)
 809 {
 810         struct ptlrpc_request   *req = mdt_info_req(info);
 811         struct obd_export       *exp = req->rq_export;
 812         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 813         struct md_attr          *ma  = &info->mti_attr;
 814         struct lu_attr          *la  = &ma->ma_attr;
 815         struct mdt_file_data    *mfd;
 816         struct mdt_body         *repbody;
 817         int                      rc = 0;
 818         int                      isreg, isdir, islnk;
 819         cfs_list_t              *t;
 820         ENTRY;
 821
 822         LASSERT(ma->ma_valid & MA_INODE);
 823
 824         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 825
 826         isreg = S_ISREG(la->la_mode);
 827         isdir = S_ISDIR(la->la_mode);
 828         islnk = S_ISLNK(la->la_mode);
 829         mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 830
 831         /* LU-2275, simulate broken behaviour (esp. prevalent in
 832          * pre-2.4 servers where a very strange reply is sent on error
 833          * that looks like it was actually almost succesful and a failure at the
 834          * same time */
 835         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_NEGATIVE_POSITIVE)) {
 836                 mdt_set_disposition(info, rep, DISP_OPEN_LOCK | \
 837                                     DISP_OPEN_OPEN | DISP_LOOKUP_NEG | \
 838                                     DISP_LOOKUP_POS);
 839                 RETURN(-ENOENT);
 840         }
 841
 842         if (exp_connect_rmtclient(exp)) {
 843                 void *buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 844
 845                 rc = mdt_pack_remote_perm(info, o, buf);
 846                 if (rc) {
 847                         repbody->valid &= ~OBD_MD_FLRMTPERM;
 848                         repbody->aclsize = 0;
 849                 } else {
 850                         repbody->valid |= OBD_MD_FLRMTPERM;
 851                         repbody->aclsize = sizeof(struct mdt_remote_perm);
 852                 }
 853         }
 854 #ifdef CONFIG_FS_POSIX_ACL
 855         else if (exp_connect_flags(exp) & OBD_CONNECT_ACL) {
 856                 const struct lu_env *env = info->mti_env;
 857                 struct md_object *next = mdt_object_child(o);
 858                 struct lu_buf *buf = &info->mti_buf;
 859
 860                 buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 861                 buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 862                                                    RCL_SERVER);
 863                 if (buf->lb_len > 0) {
 864                         rc = mo_xattr_get(env, next, buf,
 865                                           XATTR_NAME_ACL_ACCESS);
 866                         if (rc < 0) {
 867                                 if (rc == -ENODATA) {
 868                                         repbody->aclsize = 0;
 869                                         repbody->valid |= OBD_MD_FLACL;
 870                                         rc = 0;
 871                                 } else if (rc == -EOPNOTSUPP) {
 872                                         rc = 0;
 873                                 } else {
 874                                         CERROR("got acl size: %d\n", rc);
 875                                 }
 876                         } else {
 877                                 repbody->aclsize = rc;
 878                                 repbody->valid |= OBD_MD_FLACL;
 879                                 rc = 0;
 880                         }
 881                 }
 882         }
 883 #endif
 884
 885         if (info->mti_mdt->mdt_opts.mo_mds_capa &&
 886             exp_connect_flags(exp) & OBD_CONNECT_MDS_CAPA) {
 887                 struct lustre_capa *capa;
 888
 889                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
 890                 LASSERT(capa);
 891                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 892                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 893                 if (rc)
 894                         RETURN(rc);
 895                 repbody->valid |= OBD_MD_FLMDSCAPA;
 896         }
 897         if (info->mti_mdt->mdt_opts.mo_oss_capa &&
 898             exp_connect_flags(exp) & OBD_CONNECT_OSS_CAPA &&
 899             S_ISREG(lu_object_attr(&o->mot_obj.mo_lu))) {
 900                 struct lustre_capa *capa;
 901
 902                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
 903                 LASSERT(capa);
 904                 capa->lc_opc = CAPA_OPC_OSS_DEFAULT | capa_open_opc(flags);
 905                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 906                 if (rc)
 907                         RETURN(rc);
 908                 repbody->valid |= OBD_MD_FLOSSCAPA;
 909         }
 910
 911         /*
 912          * If we are following a symlink, don't open; and do not return open
 913          * handle for special nodes as client required.
 914          */
 915         if (islnk || (!isreg && !isdir &&
 916             (exp_connect_flags(req->rq_export) & OBD_CONNECT_NODEVOH))) {
 917                 lustre_msg_set_transno(req->rq_repmsg, 0);
 918                 RETURN(0);
 919         }
 920
 921         /*
 922          * We need to return the existing object's fid back, so it is done here,
 923          * after preparing the reply.
 924          */
 925         if (!created && (flags & MDS_OPEN_EXCL) && (flags & MDS_OPEN_CREAT))
 926                 RETURN(-EEXIST);
 927
 928         /* This can't be done earlier, we need to return reply body */
 929         if (isdir) {
 930                 if (flags & (MDS_OPEN_CREAT | FMODE_WRITE)) {
 931                         /* We are trying to create or write an existing dir. */
 932                         RETURN(-EISDIR);
 933                 }
 934         } else if (flags & MDS_OPEN_DIRECTORY)
 935                 RETURN(-ENOTDIR);
 936
 937         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_OPEN_CREATE,
 938                                  OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE)) {
 939                 RETURN(-EAGAIN);
 940         }
 941
 942         mfd = NULL;
 943         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
 944                 spin_lock(&med->med_open_lock);
 945                 cfs_list_for_each(t, &med->med_open_head) {
 946                         mfd = cfs_list_entry(t, struct mdt_file_data, mfd_list);
 947                         if (mfd->mfd_xid == req->rq_xid)
 948                                 break;
 949                         mfd = NULL;
 950                 }
 951                 spin_unlock(&med->med_open_lock);
 952
 953                 if (mfd != NULL) {
 954                         repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 955                         /*set repbody->ea_size for resent case*/
 956                         if (ma->ma_valid & MA_LOV) {
 957                                 LASSERT(ma->ma_lmm_size != 0);
 958                                 repbody->eadatasize = ma->ma_lmm_size;
 959                                 if (isdir)
 960                                         repbody->valid |= OBD_MD_FLDIREA;
 961                                 else
 962                                         repbody->valid |= OBD_MD_FLEASIZE;
 963                         }
 964                         mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 965                         RETURN(0);
 966                 }
 967         }
 968
 969         rc = mdt_mfd_open(info, p, o, flags, created);
 970         if (!rc)
 971                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 972
 973         RETURN(rc);
 974 }
 975
 976 extern void mdt_req_from_lcd(struct ptlrpc_request *req,
 977                              struct lsd_client_data *lcd);
 978
 979 void mdt_reconstruct_open(struct mdt_thread_info *info,
 980                           struct mdt_lock_handle *lhc)
 981 {
 982         const struct lu_env *env = info->mti_env;
 983         struct mdt_device       *mdt  = info->mti_mdt;
 984         struct req_capsule      *pill = info->mti_pill;
 985         struct ptlrpc_request   *req  = mdt_info_req(info);
 986         struct tg_export_data   *ted  = &req->rq_export->exp_target_data;
 987         struct lsd_client_data  *lcd  = ted->ted_lcd;
 988         struct md_attr          *ma   = &info->mti_attr;
 989         struct mdt_reint_record *rr   = &info->mti_rr;
 990         __u32                   flags = info->mti_spec.sp_cr_flags;
 991         struct ldlm_reply       *ldlm_rep;
 992         struct mdt_object       *parent;
 993         struct mdt_object       *child;
 994         struct mdt_body         *repbody;
 995         int                      rc;
 996         ENTRY;
 997
 998         LASSERT(pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
 999         ldlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
1000         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1001
1002         ma->ma_lmm = req_capsule_server_get(pill, &RMF_MDT_MD);
1003         ma->ma_lmm_size = req_capsule_get_size(pill, &RMF_MDT_MD,
1004                                                RCL_SERVER);
1005         ma->ma_need = MA_INODE | MA_HSM;
1006         if (ma->ma_lmm_size > 0)
1007                 ma->ma_need |= MA_LOV;
1008
1009         ma->ma_valid = 0;
1010
1011         mdt_req_from_lcd(req, lcd);
1012         mdt_set_disposition(info, ldlm_rep, lcd->lcd_last_data);
1013
1014         CDEBUG(D_INODE, "This is reconstruct open: disp="LPX64", result=%d\n",
1015                ldlm_rep->lock_policy_res1, req->rq_status);
1016
1017         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE) &&
1018             req->rq_status != 0)
1019                 /* We did not create successfully, return error to client. */
1020                 GOTO(out, rc = req->rq_status);
1021
1022         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE)) {
1023                 struct obd_export *exp = req->rq_export;
1024                 /*
1025                  * We failed after creation, but we do not know in which step
1026                  * we failed. So try to check the child object.
1027                  */
1028                 parent = mdt_object_find(env, mdt, rr->rr_fid1);
1029                 if (IS_ERR(parent)) {
1030                         rc = PTR_ERR(parent);
1031                         LCONSOLE_WARN("Parent "DFID" lookup error %d."
1032                                       " Evicting client %s with export %s.\n",
1033                                       PFID(rr->rr_fid1), rc,
1034                                       obd_uuid2str(&exp->exp_client_uuid),
1035                                       obd_export_nid2str(exp));
1036                         mdt_export_evict(exp);
1037                         RETURN_EXIT;
1038                 }
1039                 child = mdt_object_find(env, mdt, rr->rr_fid2);
1040                 if (IS_ERR(child)) {
1041                         rc = PTR_ERR(child);
1042                         LCONSOLE_WARN("Child "DFID" lookup error %d."
1043                                       " Evicting client %s with export %s.\n",
1044                                       PFID(mdt_object_fid(child)), rc,
1045                                       obd_uuid2str(&exp->exp_client_uuid),
1046                                       obd_export_nid2str(exp));
1047                         mdt_object_put(env, parent);
1048                         mdt_export_evict(exp);
1049                         RETURN_EXIT;
1050                 }
1051
1052                 if (unlikely(mdt_object_remote(child))) {
1053                         /* the child object was created on remote server */
1054                         repbody->fid1 = *rr->rr_fid2;
1055                         repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1056                         rc = 0;
1057                 } else {
1058                         if (mdt_object_exists(child)) {
1059                                 mdt_set_capainfo(info, 1, rr->rr_fid2,
1060                                                  BYPASS_CAPA);
1061                                 rc = mdt_attr_get_complex(info, child, ma);
1062                                 if (rc == 0)
1063                                         rc = mdt_finish_open(info, parent,
1064                                                              child, flags,
1065                                                              1, ldlm_rep);
1066                         } else {
1067                                 /* the child does not exist, we should do
1068                                  * regular open */
1069                                 mdt_object_put(env, parent);
1070                                 mdt_object_put(env, child);
1071                                 GOTO(regular_open, 0);
1072                         }
1073                 }
1074                 mdt_object_put(env, parent);
1075                 mdt_object_put(env, child);
1076                 GOTO(out, rc);
1077         } else {
1078 regular_open:
1079                 /* We did not try to create, so we are a pure open */
1080                 rc = mdt_reint_open(info, lhc);
1081         }
1082
1083         EXIT;
1084 out:
1085         req->rq_status = rc;
1086         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1087         LASSERT(ergo(rc < 0, lustre_msg_get_transno(req->rq_repmsg) == 0));
1088 }
1089
1090 int mdt_open_by_fid(struct mdt_thread_info* info,
1091                     struct ldlm_reply *rep)
1092 {
1093         __u32                    flags = info->mti_spec.sp_cr_flags;
1094         struct mdt_reint_record *rr = &info->mti_rr;
1095         struct md_attr          *ma = &info->mti_attr;
1096         struct mdt_object       *o;
1097         int                      rc;
1098         ENTRY;
1099
1100         o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
1101         if (IS_ERR(o))
1102                 RETURN(rc = PTR_ERR(o));
1103
1104         if (unlikely(mdt_object_remote(o))) {
1105                 /* the child object was created on remote server */
1106                 struct mdt_body *repbody;
1107                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1108                 repbody->fid1 = *rr->rr_fid2;
1109                 repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1110                 rc = 0;
1111         } else {
1112                 if (mdt_object_exists(o)) {
1113                         mdt_set_disposition(info, rep, (DISP_IT_EXECD |
1114                                                         DISP_LOOKUP_EXECD |
1115                                                         DISP_LOOKUP_POS));
1116
1117                         rc = mdt_attr_get_complex(info, o, ma);
1118                         if (rc == 0)
1119                                 rc = mdt_finish_open(info, NULL, o, flags, 0,
1120                                                      rep);
1121                 } else {
1122                         rc = -ENOENT;
1123                 }
1124         }
1125
1126         mdt_object_put(info->mti_env, o);
1127         RETURN(rc);
1128 }
1129
1130 /* lock object for open */
1131 static int mdt_object_open_lock(struct mdt_thread_info *info,
1132                                 struct mdt_object *obj,
1133                                 struct mdt_lock_handle *lhc,
1134                                 __u64 *ibits)
1135 {
1136         struct md_attr  *ma = &info->mti_attr;
1137         __u64            open_flags = info->mti_spec.sp_cr_flags;
1138         ldlm_mode_t      lm = LCK_CR;
1139         bool             try_layout = false;
1140         bool             create_layout = false;
1141         int              rc = 0;
1142         ENTRY;
1143
1144         *ibits = 0;
1145         if (open_flags & MDS_OPEN_LOCK) {
1146                 if (open_flags & FMODE_WRITE)
1147                         lm = LCK_CW;
1148                 /* if file is released, we can't deny write because we must
1149                  * restore (write) it to access it. */
1150                 else if ((open_flags & MDS_FMODE_EXEC) &&
1151                          !((ma->ma_valid & MA_HSM) &&
1152                            (ma->ma_hsm.mh_flags & HS_RELEASED)))
1153                         lm = LCK_PR;
1154                 else
1155                         lm = LCK_CR;
1156
1157                 *ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_OPEN;
1158         }
1159
1160         if (S_ISREG(lu_object_attr(&obj->mot_obj.mo_lu))) {
1161                 if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV) &&
1162                     md_should_create(open_flags))
1163                         create_layout = true;
1164                 if (exp_connect_layout(info->mti_exp) && !create_layout &&
1165                     ma->ma_need & MA_LOV)
1166                         try_layout = true;
1167         }
1168
1169         mdt_lock_handle_init(lhc);
1170         mdt_lock_reg_init(lhc, lm);
1171
1172         /* one problem to return layout lock on open is that it may result
1173          * in too many layout locks cached on the client side. */
1174         if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_OPEN) && try_layout) {
1175                 /* return lookup lock to validate inode at the client side,
1176                  * this is pretty important otherwise mdt will return layout
1177                  * lock for each open.
1178                  * However this is a double-edged sword because changing
1179                  * permission will revoke huge # of LOOKUP locks. */
1180                 *ibits |= MDS_INODELOCK_LAYOUT | MDS_INODELOCK_LOOKUP;
1181                 if (!mdt_object_lock_try(info, obj, lhc, *ibits,
1182                                          MDT_CROSS_LOCK)) {
1183                         *ibits &= ~(MDS_INODELOCK_LAYOUT|MDS_INODELOCK_LOOKUP);
1184                         if (*ibits != 0)
1185                                 rc = mdt_object_lock(info, obj, lhc, *ibits,
1186                                                 MDT_CROSS_LOCK);
1187                 }
1188         } else if (*ibits != 0) {
1189                 rc = mdt_object_lock(info, obj, lhc, *ibits, MDT_CROSS_LOCK);
1190         }
1191
1192         CDEBUG(D_INODE, "Requested bits lock:"DFID ", ibits = "LPX64
1193                 ", open_flags = "LPO64", try_layout = %d, rc = %d\n",
1194                 PFID(mdt_object_fid(obj)), *ibits, open_flags, try_layout, rc);
1195
1196         /* will change layout, revoke layout locks by enqueuing EX lock. */
1197         if (rc == 0 && create_layout) {
1198                 struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LAYOUT];
1199
1200                 CDEBUG(D_INODE, "Will create layout, get EX layout lock:"DFID
1201                         ", open_flags = "LPO64"\n",
1202                         PFID(mdt_object_fid(obj)), open_flags);
1203
1204                 LASSERT(!try_layout);
1205                 mdt_lock_handle_init(ll);
1206                 mdt_lock_reg_init(ll, LCK_EX);
1207                 rc = mdt_object_lock(info, obj, ll, MDS_INODELOCK_LAYOUT,
1208                                         MDT_LOCAL_LOCK);
1209
1210                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_LL_BLOCK, 2);
1211         }
1212
1213         RETURN(rc);
1214 }
1215
1216 static void mdt_object_open_unlock(struct mdt_thread_info *info,
1217                                    struct mdt_object *obj,
1218                                    struct mdt_lock_handle *lhc,
1219                                    __u64 ibits, int rc)
1220 {
1221         __u64 open_flags = info->mti_spec.sp_cr_flags;
1222         struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LAYOUT];
1223
1224         /* Release local layout lock - the layout lock put in MDT_LH_LAYOUT
1225          * will never return to client side. */
1226         if (lustre_handle_is_used(&ll->mlh_reg_lh)) {
1227                 LASSERT(!(ibits & MDS_INODELOCK_LAYOUT));
1228                 mdt_object_unlock(info, obj, ll, 1);
1229         }
1230
1231         /* Cross-ref case, the lock should be returned to the client */
1232         if (ibits == 0 || rc == -EREMOTE)
1233                 return;
1234
1235         if (!(open_flags & MDS_OPEN_LOCK) && !(ibits & MDS_INODELOCK_LAYOUT)) {
1236                 /* for the open request, the lock will only return to client
1237                  * if open or layout lock is granted. */
1238                 rc = 1;
1239         }
1240         if (rc != 0)
1241                 mdt_object_unlock(info, obj, lhc, 1);
1242 }
1243
1244 int mdt_open_by_fid_lock(struct mdt_thread_info *info, struct ldlm_reply *rep,
1245                          struct mdt_lock_handle *lhc)
1246 {
1247         const struct lu_env     *env   = info->mti_env;
1248         struct mdt_device       *mdt   = info->mti_mdt;
1249         __u32                    flags = info->mti_spec.sp_cr_flags;
1250         struct mdt_reint_record *rr    = &info->mti_rr;
1251         struct md_attr          *ma    = &info->mti_attr;
1252         struct mdt_object       *parent= NULL;
1253         struct mdt_object       *o;
1254         int                      rc;
1255         __u64                    ibits;
1256         ENTRY;
1257
1258         if (md_should_create(flags) && !(flags & MDS_OPEN_HAS_EA)) {
1259                 if (!lu_fid_eq(rr->rr_fid1, rr->rr_fid2)) {
1260                         parent = mdt_object_find(env, mdt, rr->rr_fid1);
1261                         if (IS_ERR(parent)) {
1262                                 CDEBUG(D_INODE, "Fail to find parent "DFID
1263                                        " for anonymous created %ld, try to"
1264                                        " use server-side parent.\n",
1265                                        PFID(rr->rr_fid1), PTR_ERR(parent));
1266                                 parent = NULL;
1267                         }
1268                 }
1269                 if (parent == NULL)
1270                         ma->ma_need |= MA_PFID;
1271         }
1272
1273         o = mdt_object_find(env, mdt, rr->rr_fid2);
1274         if (IS_ERR(o))
1275                 RETURN(rc = PTR_ERR(o));
1276
1277         if (mdt_object_remote(o)) {
1278                 CDEBUG(D_INFO, "%s: "DFID" is on remote MDT.\n",
1279                        info->mti_mdt->mdt_md_dev.md_lu_dev.ld_obd->obd_name,
1280                        PFID(rr->rr_fid2));
1281                 GOTO(out, rc = -EREMOTE);
1282         } else if (!mdt_object_exists(o)) {
1283                 mdt_set_disposition(info, rep, (DISP_LOOKUP_EXECD |
1284                                     DISP_LOOKUP_NEG));
1285                 GOTO(out, rc = -ENOENT);
1286         }
1287
1288         mdt_set_disposition(info, rep, (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1289
1290         rc = mdt_attr_get_complex(info, o, ma);
1291         if (rc)
1292                 GOTO(out, rc);
1293
1294         rc = mdt_object_open_lock(info, o, lhc, &ibits);
1295         if (rc)
1296                 GOTO(out, rc);
1297
1298         if (ma->ma_valid & MA_PFID) {
1299                 parent = mdt_object_find(env, mdt, &ma->ma_pfid);
1300                 if (IS_ERR(parent)) {
1301                         CDEBUG(D_INODE, "Fail to find parent "DFID
1302                                " for anonymous created %ld, try to"
1303                                " use system default.\n",
1304                                PFID(&ma->ma_pfid), PTR_ERR(parent));
1305                         parent = NULL;
1306                 }
1307         }
1308
1309         rc = mdt_finish_open(info, parent, o, flags, 0, rep);
1310         if (!rc) {
1311                 mdt_set_disposition(info, rep, DISP_LOOKUP_POS);
1312                 if (flags & MDS_OPEN_LOCK)
1313                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
1314         }
1315         GOTO(out, rc);
1316
1317 out:
1318         mdt_object_open_unlock(info, o, lhc, ibits, rc);
1319         mdt_object_put(env, o);
1320         if (parent != NULL)
1321                 mdt_object_put(env, parent);
1322         return rc;
1323 }
1324
1325 int mdt_pin(struct mdt_thread_info* info)
1326 {
1327         ENTRY;
1328         RETURN(err_serious(-EOPNOTSUPP));
1329 }
1330
1331 /* Cross-ref request. Currently it can only be a pure open (w/o create) */
1332 int mdt_cross_open(struct mdt_thread_info* info,
1333                    const struct lu_fid *fid,
1334                    struct ldlm_reply *rep, __u32 flags)
1335 {
1336         struct md_attr    *ma = &info->mti_attr;
1337         struct mdt_object *o;
1338         int                rc;
1339         ENTRY;
1340
1341         o = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1342         if (IS_ERR(o))
1343                 RETURN(rc = PTR_ERR(o));
1344
1345         if (mdt_object_remote(o)) {
1346                 /* Something is wrong here, the object is on another MDS! */
1347                 CERROR("%s: "DFID" isn't on this server!: rc = %d\n",
1348                        mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1349                 LU_OBJECT_DEBUG(D_WARNING, info->mti_env,
1350                                 &o->mot_obj.mo_lu,
1351                                 "Object isn't on this server! FLD error?\n");
1352                 rc = -EFAULT;
1353         } else {
1354                 if (mdt_object_exists(o)) {
1355                         /* Do permission check for cross-open. */
1356                         rc = mo_permission(info->mti_env, NULL,
1357                                            mdt_object_child(o),
1358                                            NULL, flags | MDS_OPEN_CROSS);
1359                         if (rc)
1360                                 goto out;
1361
1362                         mdt_set_capainfo(info, 0, fid, BYPASS_CAPA);
1363                         rc = mdt_attr_get_complex(info, o, ma);
1364                         if (rc == 0)
1365                                 rc = mdt_finish_open(info, NULL, o, flags, 0,
1366                                                      rep);
1367                 } else {
1368                         /*
1369                          * Something is wrong here. lookup was positive but
1370                          * there is no object!
1371                          */
1372                         CERROR("%s: "DFID" doesn't exist!: rc = %d\n",
1373                               mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1374                         rc = -EFAULT;
1375                 }
1376         }
1377 out:
1378         mdt_object_put(info->mti_env, o);
1379         RETURN(rc);
1380 }
1381
1382 int mdt_reint_open(struct mdt_thread_info *info, struct mdt_lock_handle *lhc)
1383 {
1384         struct mdt_device       *mdt = info->mti_mdt;
1385         struct ptlrpc_request   *req = mdt_info_req(info);
1386         struct mdt_object       *parent;
1387         struct mdt_object       *child;
1388         struct mdt_lock_handle  *lh;
1389         struct ldlm_reply       *ldlm_rep;
1390         struct mdt_body         *repbody;
1391         struct lu_fid           *child_fid = &info->mti_tmp_fid1;
1392         struct md_attr          *ma = &info->mti_attr;
1393         __u64                    create_flags = info->mti_spec.sp_cr_flags;
1394         __u64                    ibits;
1395         struct mdt_reint_record *rr = &info->mti_rr;
1396         struct lu_name          *lname;
1397         int                      result, rc;
1398         int                      created = 0;
1399         __u32                    msg_flags;
1400         ENTRY;
1401
1402         OBD_FAIL_TIMEOUT_ORSET(OBD_FAIL_MDS_PAUSE_OPEN, OBD_FAIL_ONCE,
1403                                (obd_timeout + 1) / 4);
1404
1405         mdt_counter_incr(req, LPROC_MDT_OPEN);
1406         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1407
1408         ma->ma_lmm = req_capsule_server_get(info->mti_pill, &RMF_MDT_MD);
1409         ma->ma_lmm_size = req_capsule_get_size(info->mti_pill, &RMF_MDT_MD,
1410                                                RCL_SERVER);
1411         ma->ma_need = MA_INODE;
1412         if (ma->ma_lmm_size > 0)
1413                 ma->ma_need |= MA_LOV;
1414
1415         ma->ma_valid = 0;
1416
1417         LASSERT(info->mti_pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
1418         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
1419
1420         if (unlikely(create_flags & MDS_OPEN_JOIN_FILE)) {
1421                 CERROR("file join is not supported anymore.\n");
1422                 GOTO(out, result = err_serious(-EOPNOTSUPP));
1423         }
1424         msg_flags = lustre_msg_get_flags(req->rq_reqmsg);
1425
1426         if ((create_flags & (MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS)) &&
1427             info->mti_spec.u.sp_ea.eadata == NULL)
1428                 GOTO(out, result = err_serious(-EINVAL));
1429
1430         CDEBUG(D_INODE, "I am going to open "DFID"/(%s->"DFID") "
1431                "cr_flag="LPO64" mode=0%06o msg_flag=0x%x\n",
1432                PFID(rr->rr_fid1), rr->rr_name,
1433                PFID(rr->rr_fid2), create_flags,
1434                ma->ma_attr.la_mode, msg_flags);
1435
1436         if (req_is_replay(req) ||
1437             (req->rq_export->exp_libclient && create_flags & MDS_OPEN_HAS_EA)) {
1438                 /* This is a replay request or from liblustre with ea. */
1439                 result = mdt_open_by_fid(info, ldlm_rep);
1440
1441                 if (result != -ENOENT) {
1442                         if (req->rq_export->exp_libclient &&
1443                             create_flags & MDS_OPEN_HAS_EA)
1444                                 GOTO(out, result = 0);
1445                         GOTO(out, result);
1446                 }
1447                 /* We didn't find the correct object, so we need to re-create it
1448                  * via a regular replay. */
1449                 if (!(create_flags & MDS_OPEN_CREAT)) {
1450                         DEBUG_REQ(D_ERROR, req,
1451                                   "OPEN & CREAT not in open replay/by_fid.");
1452                         GOTO(out, result = -EFAULT);
1453                 }
1454                 CDEBUG(D_INFO, "No object(1), continue as regular open.\n");
1455         } else if ((rr->rr_namelen == 0 && !info->mti_cross_ref &&
1456                     create_flags & MDS_OPEN_LOCK) ||
1457                    (create_flags & MDS_OPEN_BY_FID)) {
1458                 result = mdt_open_by_fid_lock(info, ldlm_rep, lhc);
1459                 if (result != -ENOENT && !(create_flags & MDS_OPEN_CREAT))
1460                         GOTO(out, result);
1461                 if (unlikely(rr->rr_namelen == 0))
1462                         GOTO(out, result = -EINVAL);
1463                 CDEBUG(D_INFO, "No object(2), continue as regular open.\n");
1464         }
1465
1466         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK))
1467                 GOTO(out, result = err_serious(-ENOMEM));
1468
1469         mdt_set_disposition(info, ldlm_rep,
1470                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1471
1472         if (info->mti_cross_ref) {
1473                 /* This is cross-ref open */
1474                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1475                 result = mdt_cross_open(info, rr->rr_fid1, ldlm_rep,
1476                                         create_flags);
1477                 GOTO(out, result);
1478         }
1479
1480         lh = &info->mti_lh[MDT_LH_PARENT];
1481         mdt_lock_pdo_init(lh, (create_flags & MDS_OPEN_CREAT) ?
1482                           LCK_PW : LCK_PR, rr->rr_name, rr->rr_namelen);
1483
1484         parent = mdt_object_find_lock(info, rr->rr_fid1, lh,
1485                                       MDS_INODELOCK_UPDATE);
1486         if (IS_ERR(parent))
1487                 GOTO(out, result = PTR_ERR(parent));
1488
1489         /* get and check version of parent */
1490         result = mdt_version_get_check(info, parent, 0);
1491         if (result)
1492                 GOTO(out_parent, result);
1493
1494         fid_zero(child_fid);
1495
1496         lname = mdt_name(info->mti_env, (char *)rr->rr_name, rr->rr_namelen);
1497         result = mdo_lookup(info->mti_env, mdt_object_child(parent),
1498                             lname, child_fid, &info->mti_spec);
1499         LASSERTF(ergo(result == 0, fid_is_sane(child_fid)),
1500                  "looking for "DFID"/%s, result fid="DFID"\n",
1501                  PFID(mdt_object_fid(parent)), rr->rr_name, PFID(child_fid));
1502
1503         if (result != 0 && result != -ENOENT && result != -ESTALE)
1504                 GOTO(out_parent, result);
1505
1506         if (result == -ENOENT || result == -ESTALE) {
1507                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1508                 if (result == -ESTALE) {
1509                         /*
1510                          * -ESTALE means the parent is a dead(unlinked) dir, so
1511                          * it should return -ENOENT to in accordance with the
1512                          * original mds implementaion.
1513                          */
1514                         GOTO(out_parent, result = -ENOENT);
1515                 }
1516                 if (!(create_flags & MDS_OPEN_CREAT))
1517                         GOTO(out_parent, result);
1518                 *child_fid = *info->mti_rr.rr_fid2;
1519                 LASSERTF(fid_is_sane(child_fid), "fid="DFID"\n",
1520                          PFID(child_fid));
1521                 /* In the function below, .hs_keycmp resolves to
1522                  * lu_obj_hop_keycmp() */
1523                 /* coverity[overrun-buffer-val] */
1524                 child = mdt_object_new(info->mti_env, mdt, child_fid);
1525         } else {
1526                 /*
1527                  * Check for O_EXCL is moved to the mdt_finish_open(), we need to
1528                  * return FID back in that case.
1529                  */
1530                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1531                 child = mdt_object_find(info->mti_env, mdt, child_fid);
1532         }
1533         if (IS_ERR(child))
1534                 GOTO(out_parent, result = PTR_ERR(child));
1535
1536         /** check version of child  */
1537         rc = mdt_version_get_check(info, child, 1);
1538         if (rc)
1539                 GOTO(out_child, result = rc);
1540
1541         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1542         if (result == -ENOENT) {
1543                 if (mdt_object_obf(parent))
1544                         GOTO(out_child, result = -EPERM);
1545
1546                 /* save versions in reply */
1547                 mdt_version_get_save(info, parent, 0);
1548                 mdt_version_get_save(info, child, 1);
1549
1550                 /* version of child will be changed */
1551                 info->mti_mos = child;
1552
1553                 /* Not found and with MDS_OPEN_CREAT: let's create it. */
1554                 mdt_set_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1555
1556                 /* Let lower layers know what is lock mode on directory. */
1557                 info->mti_spec.sp_cr_mode =
1558                         mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
1559
1560                 /*
1561                  * Do not perform lookup sanity check. We know that name does
1562                  * not exist.
1563                  */
1564                 info->mti_spec.sp_cr_lookup = 0;
1565                 info->mti_spec.sp_feat = &dt_directory_features;
1566
1567                 result = mdo_create(info->mti_env,
1568                                     mdt_object_child(parent),
1569                                     lname,
1570                                     mdt_object_child(child),
1571                                     &info->mti_spec,
1572                                     &info->mti_attr);
1573                 if (result == -ERESTART) {
1574                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1575                         GOTO(out_child, result);
1576                 } else {
1577
1578                         /* XXX: we should call this once, see few lines below */
1579                         if (result == 0)
1580                                 result = mdt_attr_get_complex(info, child, ma);
1581
1582                         if (result != 0)
1583                                 GOTO(out_child, result);
1584                 }
1585                 created = 1;
1586         } else {
1587                 /*
1588                  * The object is on remote node, return its FID for remote open.
1589                  */
1590                 if (mdt_object_remote(child)) {
1591                         /*
1592                          * Check if this lock already was sent to client and
1593                          * this is resent case. For resent case do not take lock
1594                          * again, use what is already granted.
1595                          */
1596                         LASSERT(lhc != NULL);
1597
1598                         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1599                                 struct ldlm_lock *lock;
1600
1601                                 LASSERT(msg_flags & MSG_RESENT);
1602
1603                                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1604                                 if (!lock) {
1605                                         CERROR("Invalid lock handle "LPX64"\n",
1606                                                lhc->mlh_reg_lh.cookie);
1607                                         LBUG();
1608                                 }
1609                                 LASSERT(fid_res_name_eq(mdt_object_fid(child),
1610                                                         &lock->l_resource->lr_name));
1611                                 LDLM_LOCK_PUT(lock);
1612                                 rc = 0;
1613                         } else {
1614                                 mdt_lock_handle_init(lhc);
1615                                 mdt_lock_reg_init(lhc, LCK_PR);
1616
1617                                 rc = mdt_object_lock(info, child, lhc,
1618                                                      MDS_INODELOCK_LOOKUP,
1619                                                      MDT_CROSS_LOCK);
1620                         }
1621                         repbody->fid1 = *mdt_object_fid(child);
1622                         repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1623                         if (rc != 0)
1624                                 result = rc;
1625                         else
1626                                 result = -EREMOTE;
1627                         GOTO(out_child, result);
1628                 } else {
1629                         if (mdt_object_exists(child)) {
1630                                 /* We have to get attr & LOV EA & HSM for this
1631                                  * object */
1632                                 ma->ma_need |= MA_HSM;
1633                                 result = mdt_attr_get_complex(info, child, ma);
1634                         } else {
1635                                 /*object non-exist!!!*/
1636                                 LBUG();
1637                         }
1638                 }
1639         }
1640
1641         LASSERT(!lustre_handle_is_used(&lhc->mlh_reg_lh));
1642
1643         /* get openlock if this is not replay and if a client requested it */
1644         if (!req_is_replay(req)) {
1645                 rc = mdt_object_open_lock(info, child, lhc, &ibits);
1646                 if (rc != 0) {
1647                         GOTO(out_child, result = rc);
1648                 } else if (create_flags & MDS_OPEN_LOCK) {
1649                         result = -EREMOTE;
1650                         mdt_set_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1651                 }
1652         }
1653
1654         /* Try to open it now. */
1655         rc = mdt_finish_open(info, parent, child, create_flags,
1656                              created, ldlm_rep);
1657         if (rc) {
1658                 result = rc;
1659                 /* openlock will be released if mdt_finish_open failed */
1660                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1661                 if (created) {
1662                         ma->ma_need = 0;
1663                         ma->ma_valid = 0;
1664                         ma->ma_cookie_size = 0;
1665                         rc = mdo_unlink(info->mti_env,
1666                                         mdt_object_child(parent),
1667                                         mdt_object_child(child),
1668                                         lname,
1669                                         &info->mti_attr);
1670                         if (rc != 0)
1671                                 CERROR("Error in cleanup of open\n");
1672                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1673                 }
1674         }
1675         EXIT;
1676 out_child:
1677         mdt_object_open_unlock(info, child, lhc, ibits, result);
1678         mdt_object_put(info->mti_env, child);
1679 out_parent:
1680         mdt_object_unlock_put(info, parent, lh, result || !created);
1681 out:
1682         if (result && result != -EREMOTE)
1683                 lustre_msg_set_transno(req->rq_repmsg, 0);
1684         return result;
1685 }
1686
1687 #define MFD_CLOSED(mode) (((mode) & ~(MDS_FMODE_EPOCH | MDS_FMODE_SOM | \
1688                                       MDS_FMODE_TRUNC)) == MDS_FMODE_CLOSED)
1689
1690 static int mdt_mfd_closed(struct mdt_file_data *mfd)
1691 {
1692         return ((mfd == NULL) || MFD_CLOSED(mfd->mfd_mode));
1693 }
1694
1695 int mdt_mfd_close(struct mdt_thread_info *info, struct mdt_file_data *mfd)
1696 {
1697         struct mdt_object *o = mfd->mfd_object;
1698         struct md_object *next = mdt_object_child(o);
1699         struct md_attr *ma = &info->mti_attr;
1700         int ret = MDT_IOEPOCH_CLOSED;
1701         int rc = 0;
1702         int mode;
1703         ENTRY;
1704
1705         mode = mfd->mfd_mode;
1706
1707         if ((mode & FMODE_WRITE) || (mode & MDS_FMODE_TRUNC)) {
1708                 mdt_write_put(o);
1709                 ret = mdt_ioepoch_close(info, o);
1710         } else if (mode & MDS_FMODE_EXEC) {
1711                 mdt_write_allow(o);
1712         } else if (mode & MDS_FMODE_EPOCH) {
1713                 ret = mdt_ioepoch_close(info, o);
1714         } else if (mode & MDS_FMODE_SOM) {
1715                 ret = mdt_som_au_close(info, o);
1716         }
1717
1718         /* Update atime on close only. */
1719         if ((mode & MDS_FMODE_EXEC || mode & FMODE_READ || mode & FMODE_WRITE)
1720             && (ma->ma_valid & MA_INODE) && (ma->ma_attr.la_valid & LA_ATIME)) {
1721                 /* Set the atime only. */
1722                 ma->ma_valid = MA_INODE;
1723                 ma->ma_attr.la_valid = LA_ATIME;
1724                 rc = mo_attr_set(info->mti_env, next, ma);
1725         }
1726
1727         /* If file data is modified, add the dirty flag.
1728          *
1729          * If MDS_CLOSE_CLEANUP is set, this file is being closed due to an
1730          * eviction, file could have been modified and now dirty
1731          * regarding to HSM archive, check this!
1732          * The logic here is to mark a file dirty if there's a chance it was
1733          * dirtied before the client was evicted, so that we don't have to wait
1734          * for a release attempt before finding out the file was actually dirty
1735          * and fail the release. Aggressively marking it dirty here will cause
1736          * the policy engine to attempt to re-archive it; when rearchiving, we
1737          * can compare the current version to the LMA data_version and make the
1738          * archive request into a noop if it's not actually dirty.
1739          */
1740         if ((ma->ma_attr_flags & MDS_DATA_MODIFIED) ||
1741             ((ma->ma_attr_flags & MDS_CLOSE_CLEANUP) &&
1742              (mode & (FMODE_WRITE|MDS_FMODE_TRUNC))))
1743                 rc = mdt_add_dirty_flag(info, o, ma);
1744
1745         ma->ma_need |= MA_INODE;
1746         ma->ma_valid &= ~MA_INODE;
1747
1748         if (!MFD_CLOSED(mode))
1749                 rc = mo_close(info->mti_env, next, ma, mode);
1750
1751         if (ret == MDT_IOEPOCH_GETATTR || ret == MDT_IOEPOCH_OPENED) {
1752                 struct mdt_export_data *med;
1753
1754                 /* The IOepoch is still opened or SOM update is needed.
1755                  * Put mfd back into the list. */
1756                 LASSERT(mdt_conn_flags(info) & OBD_CONNECT_SOM);
1757                 mdt_mfd_set_mode(mfd, ret == MDT_IOEPOCH_OPENED ?
1758                                       MDS_FMODE_EPOCH : MDS_FMODE_SOM);
1759
1760                 LASSERT(mdt_info_req(info));
1761                 med = &mdt_info_req(info)->rq_export->exp_mdt_data;
1762                 spin_lock(&med->med_open_lock);
1763                 cfs_list_add(&mfd->mfd_list, &med->med_open_head);
1764                 class_handle_hash_back(&mfd->mfd_handle);
1765                 spin_unlock(&med->med_open_lock);
1766
1767                 if (ret == MDT_IOEPOCH_OPENED) {
1768                         ret = 0;
1769                 } else {
1770                         ret = -EAGAIN;
1771                         CDEBUG(D_INODE, "Size-on-MDS attribute update is "
1772                                "needed on "DFID"\n", PFID(mdt_object_fid(o)));
1773                 }
1774         } else {
1775                 mdt_mfd_free(mfd);
1776                 mdt_object_put(info->mti_env, o);
1777         }
1778
1779         RETURN(rc ? rc : ret);
1780 }
1781
1782 int mdt_close(struct mdt_thread_info *info)
1783 {
1784         struct mdt_export_data *med;
1785         struct mdt_file_data   *mfd;
1786         struct mdt_object      *o;
1787         struct md_attr         *ma = &info->mti_attr;
1788         struct mdt_body        *repbody = NULL;
1789         struct ptlrpc_request  *req = mdt_info_req(info);
1790         int rc, ret = 0;
1791         ENTRY;
1792
1793         mdt_counter_incr(req, LPROC_MDT_CLOSE);
1794         /* Close may come with the Size-on-MDS update. Unpack it. */
1795         rc = mdt_close_unpack(info);
1796         if (rc)
1797                 RETURN(err_serious(rc));
1798
1799         LASSERT(info->mti_ioepoch);
1800
1801         req_capsule_set_size(info->mti_pill, &RMF_MDT_MD, RCL_SERVER,
1802                              info->mti_mdt->mdt_max_mdsize);
1803         req_capsule_set_size(info->mti_pill, &RMF_LOGCOOKIES, RCL_SERVER,
1804                              info->mti_mdt->mdt_max_cookiesize);
1805         rc = req_capsule_server_pack(info->mti_pill);
1806         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
1807                 mdt_client_compatibility(info);
1808                 if (rc == 0)
1809                         mdt_fix_reply(info);
1810                 mdt_exit_ucred(info);
1811                 RETURN(lustre_msg_get_status(req->rq_repmsg));
1812         }
1813
1814         /* Continue to close handle even if we can not pack reply */
1815         if (rc == 0) {
1816                 repbody = req_capsule_server_get(info->mti_pill,
1817                                                  &RMF_MDT_BODY);
1818                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
1819                                                     &RMF_MDT_MD);
1820                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
1821                                                        &RMF_MDT_MD,
1822                                                        RCL_SERVER);
1823                 ma->ma_cookie = req_capsule_server_get(info->mti_pill,
1824                                                        &RMF_LOGCOOKIES);
1825                 ma->ma_cookie_size = req_capsule_get_size(info->mti_pill,
1826                                                           &RMF_LOGCOOKIES,
1827                                                           RCL_SERVER);
1828                 ma->ma_need = MA_INODE | MA_LOV | MA_COOKIE;
1829                 repbody->eadatasize = 0;
1830                 repbody->aclsize = 0;
1831         } else {
1832                 rc = err_serious(rc);
1833         }
1834
1835         med = &req->rq_export->exp_mdt_data;
1836         spin_lock(&med->med_open_lock);
1837         mfd = mdt_handle2mfd(info, &info->mti_ioepoch->handle);
1838         if (mdt_mfd_closed(mfd)) {
1839                 spin_unlock(&med->med_open_lock);
1840                 CDEBUG(D_INODE, "no handle for file close: fid = "DFID
1841                        ": cookie = "LPX64"\n", PFID(info->mti_rr.rr_fid1),
1842                        info->mti_ioepoch->handle.cookie);
1843                 /** not serious error since bug 3633 */
1844                 rc = -ESTALE;
1845         } else {
1846                 class_handle_unhash(&mfd->mfd_handle);
1847                 cfs_list_del_init(&mfd->mfd_list);
1848                 spin_unlock(&med->med_open_lock);
1849
1850                 /* Do not lose object before last unlink. */
1851                 o = mfd->mfd_object;
1852                 mdt_object_get(info->mti_env, o);
1853                 ret = mdt_mfd_close(info, mfd);
1854                 if (repbody != NULL)
1855                         rc = mdt_handle_last_unlink(info, o, ma);
1856                 mdt_empty_transno(info, rc);
1857                 mdt_object_put(info->mti_env, o);
1858         }
1859         if (repbody != NULL) {
1860                 mdt_client_compatibility(info);
1861                 rc = mdt_fix_reply(info);
1862         }
1863
1864         mdt_exit_ucred(info);
1865         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK))
1866                 RETURN(err_serious(-ENOMEM));
1867
1868         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_CLOSE_NET_REP,
1869                                  OBD_FAIL_MDS_CLOSE_NET_REP))
1870                 info->mti_fail_id = OBD_FAIL_MDS_CLOSE_NET_REP;
1871         RETURN(rc ? rc : ret);
1872 }
1873
1874 /**
1875  * DONE_WRITING rpc handler.
1876  *
1877  * As mfd is not kept after replayed CLOSE (see mdt_ioepoch_close_on_replay()),
1878  * only those DONE_WRITING rpc will be replayed which really wrote smth on disk,
1879  * and got a trasid. Waiting for such DONE_WRITING is not reliable, so just
1880  * skip attributes and reconstruct the reply here.
1881  */
1882 int mdt_done_writing(struct mdt_thread_info *info)
1883 {
1884         struct ptlrpc_request   *req = mdt_info_req(info);
1885         struct mdt_body         *repbody = NULL;
1886         struct mdt_export_data  *med;
1887         struct mdt_file_data    *mfd;
1888         int rc;
1889         ENTRY;
1890
1891         rc = req_capsule_server_pack(info->mti_pill);
1892         if (rc)
1893                 RETURN(err_serious(rc));
1894
1895         repbody = req_capsule_server_get(info->mti_pill,
1896                                          &RMF_MDT_BODY);
1897         repbody->eadatasize = 0;
1898         repbody->aclsize = 0;
1899
1900         /* Done Writing may come with the Size-on-MDS update. Unpack it. */
1901         rc = mdt_close_unpack(info);
1902         if (rc)
1903                 RETURN(err_serious(rc));
1904
1905         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
1906                 mdt_exit_ucred(info);
1907                 RETURN(lustre_msg_get_status(req->rq_repmsg));
1908         }
1909
1910         med = &info->mti_exp->exp_mdt_data;
1911         spin_lock(&med->med_open_lock);
1912         mfd = mdt_handle2mfd(info, &info->mti_ioepoch->handle);
1913         if (mfd == NULL) {
1914                 spin_unlock(&med->med_open_lock);
1915                 CDEBUG(D_INODE, "no handle for done write: fid = "DFID
1916                        ": cookie = "LPX64" ioepoch = "LPU64"\n",
1917                        PFID(info->mti_rr.rr_fid1),
1918                        info->mti_ioepoch->handle.cookie,
1919                        info->mti_ioepoch->ioepoch);
1920                 /* If this is a replay, reconstruct the transno. */
1921                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1922                         rc = info->mti_ioepoch->flags & MF_SOM_AU ?
1923                              -EAGAIN : 0;
1924                         mdt_empty_transno(info, rc);
1925                 } else
1926                         rc = -ESTALE;
1927                 GOTO(error_ucred, rc);
1928         }
1929
1930         LASSERT(mfd->mfd_mode == MDS_FMODE_EPOCH ||
1931                 mfd->mfd_mode == MDS_FMODE_TRUNC);
1932         class_handle_unhash(&mfd->mfd_handle);
1933         cfs_list_del_init(&mfd->mfd_list);
1934         spin_unlock(&med->med_open_lock);
1935
1936         /* Set EPOCH CLOSE flag if not set by client. */
1937         info->mti_ioepoch->flags |= MF_EPOCH_CLOSE;
1938         info->mti_attr.ma_valid = 0;
1939
1940         info->mti_attr.ma_lmm_size = info->mti_mdt->mdt_max_mdsize;
1941         OBD_ALLOC_LARGE(info->mti_attr.ma_lmm, info->mti_mdt->mdt_max_mdsize);
1942         if (info->mti_attr.ma_lmm == NULL)
1943                 GOTO(error_ucred, rc = -ENOMEM);
1944
1945         rc = mdt_mfd_close(info, mfd);
1946
1947         OBD_FREE_LARGE(info->mti_attr.ma_lmm, info->mti_mdt->mdt_max_mdsize);
1948         mdt_empty_transno(info, rc);
1949 error_ucred:
1950         mdt_exit_ucred(info);
1951         RETURN(rc);
1952 }