lustre/mdt/mdt_open.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 #ifndef EXPORT_SYMTAB
  44 # define EXPORT_SYMTAB
  45 #endif
  46 #define DEBUG_SUBSYSTEM S_MDS
  47
  48 #include <lustre_acl.h>
  49 #include <lustre_mds.h>
  50 #include "mdt_internal.h"
  51
  52 /* we do nothing because we do not have refcount now */
  53 static void mdt_mfd_get(void *mfdp)
  54 {
  55 }
  56
  57 /* Create a new mdt_file_data struct, initialize it,
  58  * and insert it to global hash table */
  59 struct mdt_file_data *mdt_mfd_new(void)
  60 {
  61         struct mdt_file_data *mfd;
  62         ENTRY;
  63
  64         OBD_ALLOC_PTR(mfd);
  65         if (mfd != NULL) {
  66                 CFS_INIT_LIST_HEAD(&mfd->mfd_handle.h_link);
  67                 CFS_INIT_LIST_HEAD(&mfd->mfd_list);
  68                 class_handle_hash(&mfd->mfd_handle, mdt_mfd_get);
  69         }
  70         RETURN(mfd);
  71 }
  72
  73 /*
  74  * Find the mfd pointed to by handle in global hash table.
  75  * In case of replay the handle is obsoleted
  76  * but mfd can be found in mfd list by that handle
  77  */
  78 struct mdt_file_data *mdt_handle2mfd(struct mdt_thread_info *info,
  79                                      const struct lustre_handle *handle)
  80 {
  81         struct ptlrpc_request *req = mdt_info_req(info);
  82         struct mdt_file_data  *mfd;
  83         ENTRY;
  84
  85         LASSERT(handle != NULL);
  86         mfd = class_handle2object(handle->cookie);
  87         /* during dw/setattr replay the mfd can be found by old handle */
  88         if (mfd == NULL &&
  89             lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
  90                 struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
  91                 list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
  92                         if (mfd->mfd_old_handle.cookie == handle->cookie)
  93                                 RETURN (mfd);
  94                 }
  95                 mfd = NULL;
  96         }
  97         RETURN (mfd);
  98 }
  99
 100 /* free mfd */
 101 void mdt_mfd_free(struct mdt_file_data *mfd)
 102 {
 103         LASSERT(list_empty(&mfd->mfd_list));
 104         OBD_FREE_RCU(mfd, sizeof *mfd, &mfd->mfd_handle);
 105 }
 106
 107 static int mdt_create_data(struct mdt_thread_info *info,
 108                            struct mdt_object *p, struct mdt_object *o)
 109 {
 110         struct md_op_spec     *spec = &info->mti_spec;
 111         struct md_attr        *ma = &info->mti_attr;
 112         int rc;
 113         ENTRY;
 114
 115         if (!md_should_create(spec->sp_cr_flags))
 116                 RETURN(0);
 117
 118         ma->ma_need = MA_INODE | MA_LOV;
 119         ma->ma_valid = 0;
 120         rc = mdo_create_data(info->mti_env,
 121                              p ? mdt_object_child(p) : NULL,
 122                              mdt_object_child(o), spec, ma);
 123         RETURN(rc);
 124 }
 125
 126 static int mdt_ioepoch_opened(struct mdt_object *mo)
 127 {
 128         return mo->mot_ioepoch_count;
 129 }
 130
 131 int mdt_sizeonmds_enabled(struct mdt_object *mo)
 132 {
 133         return !mo->mot_ioepoch;
 134 }
 135
 136 /* Re-enable Size-on-MDS. */
 137 void mdt_sizeonmds_enable(struct mdt_thread_info *info,
 138                           struct mdt_object *mo)
 139 {
 140        spin_lock(&info->mti_mdt->mdt_ioepoch_lock);
 141        if (info->mti_ioepoch->ioepoch == mo->mot_ioepoch) {
 142                 LASSERT(!mdt_ioepoch_opened(mo));
 143                 mo->mot_ioepoch = 0;
 144                 mo->mot_flags = 0;
 145        }
 146        spin_unlock(&info->mti_mdt->mdt_ioepoch_lock);
 147 }
 148
 149 /* Open the epoch. Epoch open is allowed if @writecount is not negative.
 150  * The epoch and writecount handling is performed under the mdt_ioepoch_lock. */
 151 int mdt_ioepoch_open(struct mdt_thread_info *info, struct mdt_object *o)
 152 {
 153         struct mdt_device *mdt = info->mti_mdt;
 154         int cancel = 0;
 155         int rc = 0;
 156         ENTRY;
 157
 158         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 159             !S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
 160                 RETURN(0);
 161
 162         spin_lock(&mdt->mdt_ioepoch_lock);
 163         if (mdt_ioepoch_opened(o)) {
 164                 /* Epoch continues even if there is no writers yet. */
 165                 CDEBUG(D_INODE, "continue epoch "LPU64" for "DFID"\n",
 166                        o->mot_ioepoch, PFID(mdt_object_fid(o)));
 167         } else {
 168                 if (info->mti_replayepoch > mdt->mdt_ioepoch)
 169                         mdt->mdt_ioepoch = info->mti_replayepoch;
 170                 else
 171                         mdt->mdt_ioepoch++;
 172                 o->mot_ioepoch = info->mti_replayepoch ?
 173                         info->mti_replayepoch : mdt->mdt_ioepoch;
 174                 CDEBUG(D_INODE, "starting epoch "LPU64" for "DFID"\n",
 175                        mdt->mdt_ioepoch, PFID(mdt_object_fid(o)));
 176                 cancel = 1;
 177         }
 178         o->mot_ioepoch_count++;
 179         spin_unlock(&mdt->mdt_ioepoch_lock);
 180
 181         /* Cancel Size-on-MDS attributes on clients if not truncate.
 182          * In the later case, mdt_reint_setattr will do it. */
 183         if (cancel && (info->mti_rr.rr_fid1 != NULL)) {
 184                 struct mdt_lock_handle  *lh = &info->mti_lh[MDT_LH_CHILD];
 185                 mdt_lock_reg_init(lh, LCK_EX);
 186                 rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_UPDATE,
 187                                      MDT_LOCAL_LOCK);
 188                 if (rc == 0)
 189                         mdt_object_unlock(info, o, lh, 1);
 190         }
 191         RETURN(rc);
 192 }
 193
 194 /* Update the on-disk attributes if needed and re-enable Size-on-MDS caching. */
 195 static int mdt_sizeonmds_update(struct mdt_thread_info *info,
 196                                 struct mdt_object *o)
 197 {
 198         ENTRY;
 199
 200         CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
 201                o->mot_ioepoch, PFID(mdt_object_fid(o)), o->mot_ioepoch_count);
 202
 203         if (info->mti_attr.ma_attr.la_valid & LA_SIZE) {
 204                 /* Do Size-on-MDS attribute update.
 205                  * Size-on-MDS is re-enabled inside. */
 206                 /* XXX: since we have opened the file, it is unnecessary
 207                  * to check permission when close it. Between the "open"
 208                  * and "close", maybe someone has changed the file mode
 209                  * or flags, or the file created mode do not permit wirte,
 210                  * and so on. Just set MDS_PERM_BYPASS for all the cases. */
 211                 info->mti_attr.ma_attr_flags |= MDS_PERM_BYPASS | MDS_SOM;
 212                 info->mti_attr.ma_attr.la_valid &= LA_SIZE | LA_BLOCKS |
 213                                                 LA_ATIME | LA_MTIME | LA_CTIME;
 214                 RETURN(mdt_attr_set(info, o, 0));
 215         } else
 216                 mdt_sizeonmds_enable(info, o);
 217         RETURN(0);
 218 }
 219
 220 /* Epoch closes.
 221  * Returns 1 if epoch does not close.
 222  * Returns 0 if epoch closes.
 223  * Returns -EAGAIN if epoch closes but an Size-on-MDS Update is still needed
 224  * from the client. */
 225 static int mdt_ioepoch_close(struct mdt_thread_info *info, struct mdt_object *o)
 226 {
 227         int eviction = (mdt_info_req(info) == NULL ? 1 : 0);
 228         struct lu_attr *la = &info->mti_attr.ma_attr;
 229         int achange = 0;
 230         int opened;
 231         int rc = 1;
 232         ENTRY;
 233
 234         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 235             !S_ISREG(lu_object_attr(&o->mot_obj.mo_lu)))
 236                 RETURN(0);
 237
 238         spin_lock(&info->mti_mdt->mdt_ioepoch_lock);
 239
 240         /* Epoch closes only if client tells about it or eviction occures. */
 241         if (eviction || (info->mti_ioepoch->flags & MF_EPOCH_CLOSE)) {
 242                 LASSERT(o->mot_ioepoch_count);
 243                 o->mot_ioepoch_count--;
 244
 245                 CDEBUG(D_INODE, "Closing epoch "LPU64" on "DFID". Count %d\n",
 246                        o->mot_ioepoch, PFID(mdt_object_fid(o)),
 247                        o->mot_ioepoch_count);
 248
 249                 if (!eviction)
 250                         achange = (info->mti_ioepoch->flags & MF_SOM_CHANGE);
 251
 252                 rc = 0;
 253                 if (!eviction && !mdt_ioepoch_opened(o)) {
 254                         /* Epoch ends. Is an Size-on-MDS update needed? */
 255                         if (o->mot_flags & MF_SOM_CHANGE) {
 256                                 /* Some previous writer changed the attribute.
 257                                  * Do not believe to the current Size-on-MDS
 258                                  * update, re-ask client. */
 259                                 rc = -EAGAIN;
 260                         } else if (!(la->la_valid & LA_SIZE) && achange) {
 261                                 /* Attributes were changed by the last writer
 262                                  * only but no Size-on-MDS update is received.*/
 263                                 rc = -EAGAIN;
 264                         }
 265                 }
 266
 267                 if (achange || eviction)
 268                         o->mot_flags |= MF_SOM_CHANGE;
 269         }
 270
 271         opened = mdt_ioepoch_opened(o);
 272         spin_unlock(&info->mti_mdt->mdt_ioepoch_lock);
 273
 274         /* If eviction occurred, do nothing. */
 275         if ((rc == 0) && !opened && !eviction) {
 276                 /* Epoch ends and wanted Size-on-MDS update is obtained. */
 277                 rc = mdt_sizeonmds_update(info, o);
 278                 /* Avoid the following setattrs of these attributes, e.g.
 279                  * for atime update. */
 280                 info->mti_attr.ma_valid = 0;
 281         }
 282         RETURN(rc);
 283 }
 284
 285 int mdt_write_read(struct mdt_device *mdt, struct mdt_object *o)
 286 {
 287         int rc = 0;
 288         ENTRY;
 289         spin_lock(&mdt->mdt_ioepoch_lock);
 290         rc = o->mot_writecount;
 291         spin_unlock(&mdt->mdt_ioepoch_lock);
 292         RETURN(rc);
 293 }
 294
 295 int mdt_write_get(struct mdt_device *mdt, struct mdt_object *o)
 296 {
 297         int rc = 0;
 298         ENTRY;
 299         spin_lock(&mdt->mdt_ioepoch_lock);
 300         if (o->mot_writecount < 0)
 301                 rc = -ETXTBSY;
 302         else
 303                 o->mot_writecount++;
 304         spin_unlock(&mdt->mdt_ioepoch_lock);
 305         RETURN(rc);
 306 }
 307
 308 static void mdt_write_put(struct mdt_device *mdt, struct mdt_object *o)
 309 {
 310         ENTRY;
 311         spin_lock(&mdt->mdt_ioepoch_lock);
 312         o->mot_writecount--;
 313         spin_unlock(&mdt->mdt_ioepoch_lock);
 314         EXIT;
 315 }
 316
 317 static int mdt_write_deny(struct mdt_device *mdt, struct mdt_object *o)
 318 {
 319         int rc = 0;
 320         ENTRY;
 321         spin_lock(&mdt->mdt_ioepoch_lock);
 322         if (o->mot_writecount > 0)
 323                 rc = -ETXTBSY;
 324         else
 325                 o->mot_writecount--;
 326         spin_unlock(&mdt->mdt_ioepoch_lock);
 327         RETURN(rc);
 328 }
 329
 330 static void mdt_write_allow(struct mdt_device *mdt, struct mdt_object *o)
 331 {
 332         ENTRY;
 333         spin_lock(&mdt->mdt_ioepoch_lock);
 334         o->mot_writecount++;
 335         spin_unlock(&mdt->mdt_ioepoch_lock);
 336         EXIT;
 337 }
 338
 339 /* there can be no real transaction so prepare the fake one */
 340 static void mdt_empty_transno(struct mdt_thread_info* info)
 341 {
 342         struct mdt_device *mdt = info->mti_mdt;
 343         struct ptlrpc_request *req = mdt_info_req(info);
 344
 345         ENTRY;
 346         /* transaction has occurred already */
 347         if (lustre_msg_get_transno(req->rq_repmsg) != 0) {
 348                 EXIT;
 349                 return;
 350         }
 351
 352         spin_lock(&mdt->mdt_transno_lock);
 353         if (info->mti_transno == 0) {
 354                 info->mti_transno = ++ mdt->mdt_last_transno;
 355         } else {
 356                 /* should be replay */
 357                 if (info->mti_transno > mdt->mdt_last_transno)
 358                         mdt->mdt_last_transno = info->mti_transno;
 359         }
 360         spin_unlock(&mdt->mdt_transno_lock);
 361
 362         CDEBUG(D_INODE, "transno = %llu, last_committed = %llu\n",
 363                         info->mti_transno,
 364                         req->rq_export->exp_obd->obd_last_committed);
 365
 366         req->rq_transno = info->mti_transno;
 367         lustre_msg_set_transno(req->rq_repmsg, info->mti_transno);
 368         EXIT;
 369 }
 370
 371 void mdt_mfd_set_mode(struct mdt_file_data *mfd, int mode)
 372 {
 373         LASSERT(mfd != NULL);
 374
 375         CDEBUG(D_HA, "Change mfd %p mode 0x%x->0x%x\n",
 376                mfd, (unsigned int)mfd->mfd_mode, (unsigned int)mode);
 377
 378         mfd->mfd_mode = mode;
 379 }
 380
 381 static int mdt_mfd_open(struct mdt_thread_info *info, struct mdt_object *p,
 382                         struct mdt_object *o, int flags, int created)
 383 {
 384         struct ptlrpc_request   *req = mdt_info_req(info);
 385         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 386         struct mdt_file_data    *mfd;
 387         struct md_attr          *ma  = &info->mti_attr;
 388         struct lu_attr          *la  = &ma->ma_attr;
 389         struct mdt_body         *repbody;
 390         int                      rc = 0, isdir, isreg;
 391         ENTRY;
 392
 393         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 394
 395         isreg = S_ISREG(la->la_mode);
 396         isdir = S_ISDIR(la->la_mode);
 397         if (isreg && !(ma->ma_valid & MA_LOV)) {
 398                 /*
 399                  * No EA, check whether it is will set regEA and dirEA since in
 400                  * above attr get, these size might be zero, so reset it, to
 401                  * retrieve the MD after create obj.
 402                  */
 403                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 404                                                        &RMF_MDT_MD,
 405                                                        RCL_SERVER);
 406                 /* in replay case, p == NULL */
 407                 rc = mdt_create_data(info, p, o);
 408                 if (rc)
 409                         RETURN(rc);
 410         }
 411
 412         CDEBUG(D_INODE, "after open, ma_valid bit = "LPX64" lmm_size = %d\n",
 413                ma->ma_valid, ma->ma_lmm_size);
 414
 415         if (ma->ma_valid & MA_LOV) {
 416                 LASSERT(ma->ma_lmm_size != 0);
 417                 repbody->eadatasize = ma->ma_lmm_size;
 418                 if (isdir)
 419                         repbody->valid |= OBD_MD_FLDIREA;
 420                 else
 421                         repbody->valid |= OBD_MD_FLEASIZE;
 422         }
 423
 424         if (flags & FMODE_WRITE) {
 425                 rc = mdt_write_get(info->mti_mdt, o);
 426                 if (rc == 0) {
 427                         mdt_ioepoch_open(info, o);
 428                         repbody->ioepoch = o->mot_ioepoch;
 429                 }
 430         } else if (flags & MDS_FMODE_EXEC) {
 431                 rc = mdt_write_deny(info->mti_mdt, o);
 432         }
 433         if (rc)
 434                 RETURN(rc);
 435
 436         rc = mo_open(info->mti_env, mdt_object_child(o),
 437                      created ? flags | MDS_OPEN_CREATED : flags);
 438         if (rc)
 439                 RETURN(rc);
 440
 441         mfd = mdt_mfd_new();
 442         if (mfd != NULL) {
 443                 /*
 444                  * Keep a reference on this object for this open, and is
 445                  * released by mdt_mfd_close().
 446                  */
 447                 mdt_object_get(info->mti_env, o);
 448
 449                 /*
 450                  * @flags is always not zero. At least it should be FMODE_READ,
 451                  * FMODE_WRITE or FMODE_EXEC.
 452                  */
 453                 LASSERT(flags != 0);
 454
 455                 /* Open handling. */
 456                 mdt_mfd_set_mode(mfd, flags);
 457
 458                 mfd->mfd_object = o;
 459                 mfd->mfd_xid = req->rq_xid;
 460
 461                 /* replay handle */
 462                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 463                         struct mdt_file_data *old_mfd;
 464                         /* Check wheather old cookie already exist in
 465                          * the list, becasue when do recovery, client
 466                          * might be disconnected from server, and
 467                          * restart replay, so there maybe some orphan
 468                          * mfd here, we should remove them */
 469                         LASSERT(info->mti_rr.rr_handle != NULL);
 470                         old_mfd = mdt_handle2mfd(info, info->mti_rr.rr_handle);
 471                         if (old_mfd) {
 472                                 CDEBUG(D_HA, "del orph mfd %p fid=("DFID") "
 473                                        "cookie=" LPX64"\n",
 474                                        mfd,
 475                                        PFID(mdt_object_fid(mfd->mfd_object)),
 476                                        info->mti_rr.rr_handle->cookie);
 477                                 spin_lock(&med->med_open_lock);
 478                                 class_handle_unhash(&old_mfd->mfd_handle);
 479                                 list_del_init(&old_mfd->mfd_list);
 480                                 spin_unlock(&med->med_open_lock);
 481                                 mdt_mfd_close(info, old_mfd);
 482                         }
 483                         CDEBUG(D_HA, "Store old cookie "LPX64" in new mfd\n",
 484                                info->mti_rr.rr_handle->cookie);
 485                         mfd->mfd_old_handle.cookie =
 486                                                 info->mti_rr.rr_handle->cookie;
 487                 }
 488                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 489
 490                 if (req->rq_export->exp_disconnected) {
 491                         spin_lock(&med->med_open_lock);
 492                         class_handle_unhash(&mfd->mfd_handle);
 493                         list_del_init(&mfd->mfd_list);
 494                         spin_unlock(&med->med_open_lock);
 495                         mdt_mfd_close(info, mfd);
 496                 } else {
 497                         spin_lock(&med->med_open_lock);
 498                         list_add(&mfd->mfd_list, &med->med_open_head);
 499                         spin_unlock(&med->med_open_lock);
 500                 }
 501
 502                 mdt_empty_transno(info);
 503         } else
 504                 rc = -ENOMEM;
 505
 506         RETURN(rc);
 507 }
 508
 509
 510 static int mdt_finish_open(struct mdt_thread_info *info,
 511                            struct mdt_object *p, struct mdt_object *o,
 512                            int flags, int created, struct ldlm_reply *rep)
 513 {
 514         struct ptlrpc_request   *req = mdt_info_req(info);
 515         struct obd_export       *exp = req->rq_export;
 516         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 517         struct md_attr          *ma  = &info->mti_attr;
 518         struct lu_attr          *la  = &ma->ma_attr;
 519         struct mdt_file_data    *mfd;
 520         struct mdt_body         *repbody;
 521         int                      rc = 0;
 522         int                      isreg, isdir, islnk;
 523         struct list_head        *t;
 524         ENTRY;
 525
 526         LASSERT(ma->ma_valid & MA_INODE);
 527
 528         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 529
 530         isreg = S_ISREG(la->la_mode);
 531         isdir = S_ISDIR(la->la_mode);
 532         islnk = S_ISLNK(la->la_mode);
 533         mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 534
 535         if (exp_connect_rmtclient(exp)) {
 536                 void *buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 537
 538                 rc = mdt_pack_remote_perm(info, o, buf);
 539                 if (rc) {
 540                         repbody->valid &= ~OBD_MD_FLRMTPERM;
 541                         repbody->aclsize = 0;
 542                 } else {
 543                         repbody->valid |= OBD_MD_FLRMTPERM;
 544                         repbody->aclsize = sizeof(struct mdt_remote_perm);
 545                 }
 546         }
 547 #ifdef CONFIG_FS_POSIX_ACL
 548         else if (exp->exp_connect_flags & OBD_CONNECT_ACL) {
 549                 const struct lu_env *env = info->mti_env;
 550                 struct md_object *next = mdt_object_child(o);
 551                 struct lu_buf *buf = &info->mti_buf;
 552
 553                 buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 554                 buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 555                                                    RCL_SERVER);
 556                 if (buf->lb_len > 0) {
 557                         rc = mo_xattr_get(env, next, buf,
 558                                           XATTR_NAME_ACL_ACCESS);
 559                         if (rc < 0) {
 560                                 if (rc == -ENODATA) {
 561                                         repbody->aclsize = 0;
 562                                         repbody->valid |= OBD_MD_FLACL;
 563                                         rc = 0;
 564                                 } else if (rc == -EOPNOTSUPP) {
 565                                         rc = 0;
 566                                 } else {
 567                                         CERROR("got acl size: %d\n", rc);
 568                                 }
 569                         } else {
 570                                 repbody->aclsize = rc;
 571                                 repbody->valid |= OBD_MD_FLACL;
 572                                 rc = 0;
 573                         }
 574                 }
 575         }
 576 #endif
 577
 578         if (info->mti_mdt->mdt_opts.mo_mds_capa &&
 579             exp->exp_connect_flags & OBD_CONNECT_MDS_CAPA) {
 580                 struct lustre_capa *capa;
 581
 582                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
 583                 LASSERT(capa);
 584                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 585                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 586                 if (rc)
 587                         RETURN(rc);
 588                 repbody->valid |= OBD_MD_FLMDSCAPA;
 589         }
 590         if (info->mti_mdt->mdt_opts.mo_oss_capa &&
 591             exp->exp_connect_flags & OBD_CONNECT_OSS_CAPA &&
 592             S_ISREG(lu_object_attr(&o->mot_obj.mo_lu))) {
 593                 struct lustre_capa *capa;
 594
 595                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
 596                 LASSERT(capa);
 597                 capa->lc_opc = CAPA_OPC_OSS_DEFAULT | capa_open_opc(flags);
 598                 rc = mo_capa_get(info->mti_env, mdt_object_child(o), capa, 0);
 599                 if (rc)
 600                         RETURN(rc);
 601                 repbody->valid |= OBD_MD_FLOSSCAPA;
 602         }
 603
 604         /*
 605          * If we are following a symlink, don't open; and do not return open
 606          * handle for special nodes as client required.
 607          */
 608         if (islnk || (!isreg && !isdir &&
 609             (req->rq_export->exp_connect_flags & OBD_CONNECT_NODEVOH))) {
 610                 lustre_msg_set_transno(req->rq_repmsg, 0);
 611                 RETURN(0);
 612         }
 613
 614         mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 615
 616         /*
 617          * We need to return the existing object's fid back, so it is done here,
 618          * after preparing the reply.
 619          */
 620         if (!created && (flags & MDS_OPEN_EXCL) && (flags & MDS_OPEN_CREAT))
 621                 RETURN(-EEXIST);
 622
 623         /* This can't be done earlier, we need to return reply body */
 624         if (isdir) {
 625                 if (flags & (MDS_OPEN_CREAT | FMODE_WRITE)) {
 626                         /* We are trying to create or write an existing dir. */
 627                         RETURN(-EISDIR);
 628                 }
 629         } else if (flags & MDS_OPEN_DIRECTORY)
 630                 RETURN(-ENOTDIR);
 631
 632         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_OPEN_CREATE,
 633                                  OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE)) {
 634                 RETURN(-EAGAIN);
 635         }
 636
 637         mfd = NULL;
 638         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
 639                 spin_lock(&med->med_open_lock);
 640                 list_for_each(t, &med->med_open_head) {
 641                         mfd = list_entry(t, struct mdt_file_data, mfd_list);
 642                         if (mfd->mfd_xid == req->rq_xid) {
 643                                 break;
 644                         }
 645                         mfd = NULL;
 646                 }
 647                 spin_unlock(&med->med_open_lock);
 648
 649                 if (mfd != NULL) {
 650                         repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 651                         /*set repbody->ea_size for resent case*/
 652                         if (ma->ma_valid & MA_LOV) {
 653                                 LASSERT(ma->ma_lmm_size != 0);
 654                                 repbody->eadatasize = ma->ma_lmm_size;
 655                                 if (isdir)
 656                                         repbody->valid |= OBD_MD_FLDIREA;
 657                                 else
 658                                         repbody->valid |= OBD_MD_FLEASIZE;
 659                         }
 660                         RETURN(0);
 661                 }
 662         }
 663
 664         rc = mdt_mfd_open(info, p, o, flags, created);
 665         RETURN(rc);
 666 }
 667
 668 extern void mdt_req_from_lcd(struct ptlrpc_request *req,
 669                              struct lsd_client_data *lcd);
 670
 671 void mdt_reconstruct_open(struct mdt_thread_info *info,
 672                           struct mdt_lock_handle *lhc)
 673 {
 674         const struct lu_env *env = info->mti_env;
 675         struct mdt_device       *mdt  = info->mti_mdt;
 676         struct req_capsule      *pill = info->mti_pill;
 677         struct ptlrpc_request   *req  = mdt_info_req(info);
 678         struct mdt_export_data  *med  = &req->rq_export->exp_mdt_data;
 679         struct lsd_client_data  *lcd  = med->med_lcd;
 680         struct md_attr          *ma   = &info->mti_attr;
 681         struct mdt_reint_record *rr   = &info->mti_rr;
 682         __u32                   flags = info->mti_spec.sp_cr_flags;
 683         struct ldlm_reply       *ldlm_rep;
 684         struct mdt_object       *parent;
 685         struct mdt_object       *child;
 686         struct mdt_body         *repbody;
 687         int                      rc;
 688         ENTRY;
 689
 690         LASSERT(pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
 691         ldlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
 692         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 693
 694         ma->ma_lmm = req_capsule_server_get(pill, &RMF_MDT_MD);
 695         ma->ma_lmm_size = req_capsule_get_size(pill, &RMF_MDT_MD,
 696                                                RCL_SERVER);
 697         ma->ma_need = MA_INODE;
 698         if (ma->ma_lmm_size > 0)
 699                 ma->ma_need |= MA_LOV;
 700
 701         ma->ma_valid = 0;
 702
 703         mdt_req_from_lcd(req, med->med_lcd);
 704         mdt_set_disposition(info, ldlm_rep, lcd->lcd_last_data);
 705
 706         CERROR("This is reconstruct open: disp="LPX64", result=%d\n",
 707                 ldlm_rep->lock_policy_res1, req->rq_status);
 708
 709         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE) &&
 710             req->rq_status != 0)
 711                 /* We did not create successfully, return error to client. */
 712                 GOTO(out, rc = req->rq_status);
 713
 714         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE)) {
 715                 struct obd_export *exp = req->rq_export;
 716                 /*
 717                  * We failed after creation, but we do not know in which step
 718                  * we failed. So try to check the child object.
 719                  */
 720                 parent = mdt_object_find(env, mdt, rr->rr_fid1);
 721                 if (IS_ERR(parent)) {
 722                         rc = PTR_ERR(parent);
 723                         LCONSOLE_WARN("Parent "DFID" lookup error %d."
 724                                       " Evicting client %s with export %s.\n",
 725                                       PFID(mdt_object_fid(parent)), rc,
 726                                       obd_uuid2str(&exp->exp_client_uuid),
 727                                       obd_export_nid2str(exp));
 728                         mdt_export_evict(exp);
 729                         EXIT;
 730                         return;
 731                 }
 732                 child = mdt_object_find(env, mdt, rr->rr_fid2);
 733                 if (IS_ERR(child)) {
 734                         rc = PTR_ERR(child);
 735                         LCONSOLE_WARN("Child "DFID" lookup error %d."
 736                                       " Evicting client %s with export %s.\n",
 737                                       PFID(mdt_object_fid(child)), rc,
 738                                       obd_uuid2str(&exp->exp_client_uuid),
 739                                       obd_export_nid2str(exp));
 740                         mdt_object_put(env, parent);
 741                         mdt_export_evict(exp);
 742                         EXIT;
 743                         return;
 744                 }
 745                 rc = mdt_object_exists(child);
 746                 if (rc > 0) {
 747                         struct md_object *next;
 748
 749                         mdt_set_capainfo(info, 1, rr->rr_fid2, BYPASS_CAPA);
 750                         next = mdt_object_child(child);
 751                         rc = mo_attr_get(env, next, ma);
 752                         if (rc == 0)
 753                               rc = mdt_finish_open(info, parent, child,
 754                                                    flags, 1, ldlm_rep);
 755                 } else if (rc < 0) {
 756                         /* the child object was created on remote server */
 757                         repbody->fid1 = *rr->rr_fid2;
 758                         repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
 759                         rc = 0;
 760                 } else if (rc == 0) {
 761                         /* the child does not exist, we should do regular open */
 762                         mdt_object_put(env, parent);
 763                         mdt_object_put(env, child);
 764                         GOTO(regular_open, 0);
 765                 }
 766                 mdt_object_put(env, parent);
 767                 mdt_object_put(env, child);
 768                 GOTO(out, rc);
 769         } else {
 770 regular_open:
 771                 /* We did not try to create, so we are a pure open */
 772                 rc = mdt_reint_open(info, lhc);
 773         }
 774
 775         EXIT;
 776 out:
 777         req->rq_status = rc;
 778         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
 779         LASSERT(ergo(rc < 0, lustre_msg_get_transno(req->rq_repmsg) == 0));
 780 }
 781
 782 static int mdt_open_by_fid(struct mdt_thread_info* info,
 783                            struct ldlm_reply *rep)
 784 {
 785         const struct lu_env     *env = info->mti_env;
 786         __u32                    flags = info->mti_spec.sp_cr_flags;
 787         struct mdt_reint_record *rr = &info->mti_rr;
 788         struct md_attr          *ma = &info->mti_attr;
 789         struct mdt_object       *o;
 790         int                      rc;
 791         ENTRY;
 792
 793         o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
 794         if (IS_ERR(o))
 795                 RETURN(rc = PTR_ERR(o));
 796
 797         rc = mdt_object_exists(o);
 798         if (rc > 0) {
 799                 mdt_set_disposition(info, rep, (DISP_IT_EXECD |
 800                                                 DISP_LOOKUP_EXECD |
 801                                                 DISP_LOOKUP_POS));
 802
 803                 rc = mo_attr_get(env, mdt_object_child(o), ma);
 804                 if (rc == 0)
 805                         rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
 806         } else if (rc == 0) {
 807                 rc = -ENOENT;
 808         } else  {
 809                 /* the child object was created on remote server */
 810                 struct mdt_body *repbody;
 811                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 812                 repbody->fid1 = *rr->rr_fid2;
 813                 repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
 814                 rc = 0;
 815         }
 816
 817         mdt_object_put(info->mti_env, o);
 818         RETURN(rc);
 819 }
 820
 821 static int mdt_open_anon_by_fid(struct mdt_thread_info* info,
 822                                 struct ldlm_reply *rep,
 823                                 struct mdt_lock_handle *lhc)
 824 {
 825         __u32                    flags = info->mti_spec.sp_cr_flags;
 826         struct mdt_reint_record *rr = &info->mti_rr;
 827         struct md_attr          *ma = &info->mti_attr;
 828         struct mdt_object       *o;
 829         int                      rc;
 830         ldlm_mode_t              lm;
 831         ENTRY;
 832
 833         o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
 834         if (IS_ERR(o))
 835                 RETURN(rc = PTR_ERR(o));
 836
 837         rc = mdt_object_exists(o);
 838         if (rc == 0) {
 839                 mdt_set_disposition(info, rep, (DISP_LOOKUP_EXECD |
 840                                     DISP_LOOKUP_NEG));
 841                 GOTO(out, rc = -ENOENT);
 842         } else if (rc < 0) {
 843                 CERROR("NFS remote open shouldn't happen.\n");
 844                 GOTO(out, rc);
 845         }
 846
 847         mdt_set_disposition(info, rep, (DISP_IT_EXECD |
 848                                         DISP_LOOKUP_EXECD |
 849                                         DISP_LOOKUP_POS));
 850
 851         if (flags & FMODE_WRITE)
 852                 lm = LCK_CW;
 853         else if (flags & MDS_FMODE_EXEC)
 854                 lm = LCK_PR;
 855         else
 856                 lm = LCK_CR;
 857
 858         mdt_lock_handle_init(lhc);
 859         mdt_lock_reg_init(lhc, lm);
 860         rc = mdt_object_lock(info, o, lhc,
 861                              MDS_INODELOCK_LOOKUP | MDS_INODELOCK_OPEN,
 862                              MDT_CROSS_LOCK);
 863         if (rc)
 864                 GOTO(out, rc);
 865
 866         rc = mo_attr_get(info->mti_env, mdt_object_child(o), ma);
 867         if (rc)
 868                 GOTO(out, rc);
 869
 870         if (flags & MDS_OPEN_LOCK)
 871                 mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
 872         rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
 873
 874         if (!(flags & MDS_OPEN_LOCK))
 875                 mdt_object_unlock(info, o, lhc, 1);
 876
 877         GOTO(out, rc);
 878 out:
 879         mdt_object_put(info->mti_env, o);
 880         return rc;
 881 }
 882
 883 int mdt_pin(struct mdt_thread_info* info)
 884 {
 885         ENTRY;
 886         RETURN(err_serious(-EOPNOTSUPP));
 887 }
 888
 889 /* Cross-ref request. Currently it can only be a pure open (w/o create) */
 890 static int mdt_cross_open(struct mdt_thread_info* info,
 891                           const struct lu_fid *fid,
 892                           struct ldlm_reply *rep, __u32 flags)
 893 {
 894         struct md_attr    *ma = &info->mti_attr;
 895         struct mdt_object *o;
 896         int                rc;
 897         ENTRY;
 898
 899         o = mdt_object_find(info->mti_env, info->mti_mdt, fid);
 900         if (IS_ERR(o))
 901                 RETURN(rc = PTR_ERR(o));
 902
 903         rc = mdt_object_exists(o);
 904         if (rc > 0) {
 905                 /* Do permission check for cross-open. */
 906                 rc = mo_permission(info->mti_env, NULL, mdt_object_child(o),
 907                                    NULL, flags | MDS_OPEN_CROSS);
 908                 if (rc)
 909                         goto out;
 910
 911                 mdt_set_capainfo(info, 0, fid, BYPASS_CAPA);
 912                 rc = mo_attr_get(info->mti_env, mdt_object_child(o), ma);
 913                 if (rc == 0)
 914                         rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
 915         } else if (rc == 0) {
 916                 /*
 917                  * Something is wrong here. lookup was positive but there is
 918                  * no object!
 919                  */
 920                 CERROR("Cross-ref object doesn't exist!\n");
 921                 rc = -EFAULT;
 922         } else  {
 923                 /* Something is wrong here, the object is on another MDS! */
 924                 CERROR("The object isn't on this server! FLD error?\n");
 925                 LU_OBJECT_DEBUG(D_WARNING, info->mti_env,
 926                                 &o->mot_obj.mo_lu,
 927                                 "Object isn't on this server! FLD error?\n");
 928
 929                 rc = -EFAULT;
 930         }
 931
 932 out:
 933         mdt_object_put(info->mti_env, o);
 934         RETURN(rc);
 935 }
 936
 937 int mdt_reint_open(struct mdt_thread_info *info, struct mdt_lock_handle *lhc)
 938 {
 939         struct mdt_device       *mdt = info->mti_mdt;
 940         struct ptlrpc_request   *req = mdt_info_req(info);
 941         struct mdt_object       *parent;
 942         struct mdt_object       *child;
 943         struct mdt_lock_handle  *lh;
 944         struct ldlm_reply       *ldlm_rep;
 945         struct mdt_body         *repbody;
 946         struct lu_fid           *child_fid = &info->mti_tmp_fid1;
 947         struct md_attr          *ma = &info->mti_attr;
 948         __u32                    create_flags = info->mti_spec.sp_cr_flags;
 949         struct mdt_reint_record *rr = &info->mti_rr;
 950         struct lu_name          *lname;
 951         int                      result, rc;
 952         int                      created = 0;
 953         __u32                    msg_flags;
 954         ENTRY;
 955
 956         OBD_FAIL_TIMEOUT_ORSET(OBD_FAIL_MDS_PAUSE_OPEN, OBD_FAIL_ONCE,
 957                                (obd_timeout + 1) / 4);
 958
 959         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 960
 961         ma->ma_lmm = req_capsule_server_get(info->mti_pill, &RMF_MDT_MD);
 962         ma->ma_lmm_size = req_capsule_get_size(info->mti_pill, &RMF_MDT_MD,
 963                                                RCL_SERVER);
 964         ma->ma_need = MA_INODE;
 965         if (ma->ma_lmm_size > 0)
 966                 ma->ma_need |= MA_LOV;
 967
 968         ma->ma_valid = 0;
 969
 970         LASSERT(info->mti_pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
 971         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
 972
 973         if (unlikely(create_flags & MDS_OPEN_JOIN_FILE)) {
 974                 CERROR("file join is not supported anymore.\n");
 975                 GOTO(out, result = err_serious(-EOPNOTSUPP));
 976         }
 977         msg_flags = lustre_msg_get_flags(req->rq_reqmsg);
 978
 979         if ((create_flags & (MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS)) &&
 980             info->mti_spec.u.sp_ea.eadata == NULL)
 981                 GOTO(out, result = err_serious(-EINVAL));
 982
 983         CDEBUG(D_INODE, "I am going to open "DFID"/(%s->"DFID") "
 984                "cr_flag=0%o mode=0%06o msg_flag=0x%x\n",
 985                PFID(rr->rr_fid1), rr->rr_name,
 986                PFID(rr->rr_fid2), create_flags,
 987                ma->ma_attr.la_mode, msg_flags);
 988
 989         if (msg_flags & MSG_REPLAY ||
 990             (req->rq_export->exp_libclient && create_flags&MDS_OPEN_HAS_EA)) {
 991                 /* This is a replay request or from liblustre with ea. */
 992                 result = mdt_open_by_fid(info, ldlm_rep);
 993
 994                 if (result != -ENOENT) {
 995                         if (req->rq_export->exp_libclient &&
 996                             create_flags&MDS_OPEN_HAS_EA)
 997                                 GOTO(out, result = 0);
 998                         GOTO(out, result);
 999                 }
1000                 /*
1001                  * We didn't find the correct object, so we need to re-create it
1002                  * via a regular replay.
1003                  */
1004                 if (!(create_flags & MDS_OPEN_CREAT)) {
1005                         DEBUG_REQ(D_ERROR, req,"OPEN & CREAT not in open replay.");
1006                         GOTO(out, result = -EFAULT);
1007                 }
1008                 CDEBUG(D_INFO, "Open replay did find object, continue as "
1009                        "regular open\n");
1010         } else if (rr->rr_namelen == 0 && !info->mti_cross_ref) {
1011                 result = mdt_open_anon_by_fid(info, ldlm_rep, lhc);
1012                 if (result != -ENOENT)
1013                         GOTO(out, result);
1014         }
1015
1016         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK))
1017                 GOTO(out, result = err_serious(-ENOMEM));
1018
1019         mdt_set_disposition(info, ldlm_rep,
1020                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1021
1022         if (info->mti_cross_ref) {
1023                 /* This is cross-ref open */
1024                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1025                 result = mdt_cross_open(info, rr->rr_fid1, ldlm_rep,
1026                                         create_flags);
1027                 GOTO(out, result);
1028         }
1029
1030         lh = &info->mti_lh[MDT_LH_PARENT];
1031         mdt_lock_pdo_init(lh, (create_flags & MDS_OPEN_CREAT) ?
1032                           LCK_PW : LCK_PR, rr->rr_name, rr->rr_namelen);
1033
1034         parent = mdt_object_find_lock(info, rr->rr_fid1, lh,
1035                                       MDS_INODELOCK_UPDATE);
1036         if (IS_ERR(parent))
1037                 GOTO(out, result = PTR_ERR(parent));
1038
1039         fid_zero(child_fid);
1040
1041         lname = mdt_name(info->mti_env, (char *)rr->rr_name, rr->rr_namelen);
1042
1043         result = mdo_lookup(info->mti_env, mdt_object_child(parent),
1044                             lname, child_fid, &info->mti_spec);
1045         LASSERTF(ergo(result == 0, fid_is_sane(child_fid)),
1046                  "looking for "DFID"/%s, result fid="DFID"\n",
1047                  PFID(mdt_object_fid(parent)), rr->rr_name, PFID(child_fid));
1048
1049         if (result != 0 && result != -ENOENT && result != -ESTALE)
1050                 GOTO(out_parent, result);
1051
1052         if (result == -ENOENT || result == -ESTALE) {
1053                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1054                 if (result == -ESTALE) {
1055                         /*
1056                          * -ESTALE means the parent is a dead(unlinked) dir, so
1057                          * it should return -ENOENT to in accordance with the
1058                          * original mds implementaion.
1059                          */
1060                         GOTO(out_parent, result = -ENOENT);
1061                 }
1062                 if (!(create_flags & MDS_OPEN_CREAT))
1063                         GOTO(out_parent, result);
1064                 *child_fid = *info->mti_rr.rr_fid2;
1065                 LASSERTF(fid_is_sane(child_fid), "fid="DFID"\n",
1066                          PFID(child_fid));
1067         } else {
1068                 /*
1069                  * Check for O_EXCL is moved to the mdt_finish_open(), we need to
1070                  * return FID back in that case.
1071                  */
1072                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1073         }
1074
1075         child = mdt_object_find(info->mti_env, mdt, child_fid);
1076         if (IS_ERR(child))
1077                 GOTO(out_parent, result = PTR_ERR(child));
1078
1079         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1080         if (result == -ENOENT) {
1081                 /* Not found and with MDS_OPEN_CREAT: let's create it. */
1082                 mdt_set_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1083
1084                 info->mti_mos[0] = parent;
1085                 info->mti_mos[1] = child;
1086                 result = mdt_version_get_check(info, 0);
1087                 if (result)
1088                         GOTO(out_child, result);
1089
1090                 /* Let lower layers know what is lock mode on directory. */
1091                 info->mti_spec.sp_cr_mode =
1092                         mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
1093
1094                 /*
1095                  * Do not perform lookup sanity check. We know that name does
1096                  * not exist.
1097                  */
1098                 info->mti_spec.sp_cr_lookup = 0;
1099                 info->mti_spec.sp_feat = &dt_directory_features;
1100
1101                 result = mdo_create(info->mti_env,
1102                                     mdt_object_child(parent),
1103                                     lname,
1104                                     mdt_object_child(child),
1105                                     &info->mti_spec,
1106                                     &info->mti_attr);
1107                 if (result == -ERESTART) {
1108                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1109                         GOTO(out_child, result);
1110                 } else {
1111                         if (result != 0)
1112                                 GOTO(out_child, result);
1113                 }
1114                 created = 1;
1115         } else {
1116                 /* We have to get attr & lov ea for this object */
1117                 result = mo_attr_get(info->mti_env, mdt_object_child(child),
1118                                      ma);
1119                 /*
1120                  * The object is on remote node, return its FID for remote open.
1121                  */
1122                 if (result == -EREMOTE) {
1123                         /*
1124                          * Check if this lock already was sent to client and
1125                          * this is resent case. For resent case do not take lock
1126                          * again, use what is already granted.
1127                          */
1128                         LASSERT(lhc != NULL);
1129
1130                         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1131                                 struct ldlm_lock *lock;
1132
1133                                 LASSERT(msg_flags & MSG_RESENT);
1134
1135                                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1136                                 if (!lock) {
1137                                         CERROR("Invalid lock handle "LPX64"\n",
1138                                                lhc->mlh_reg_lh.cookie);
1139                                         LBUG();
1140                                 }
1141                                 LASSERT(fid_res_name_eq(mdt_object_fid(child),
1142                                                         &lock->l_resource->lr_name));
1143                                 LDLM_LOCK_PUT(lock);
1144                                 rc = 0;
1145                         } else {
1146                                 mdt_lock_handle_init(lhc);
1147                                 mdt_lock_reg_init(lhc, LCK_PR);
1148
1149                                 rc = mdt_object_lock(info, child, lhc,
1150                                                      MDS_INODELOCK_LOOKUP,
1151                                                      MDT_CROSS_LOCK);
1152                         }
1153                         repbody->fid1 = *mdt_object_fid(child);
1154                         repbody->valid |= (OBD_MD_FLID | OBD_MD_MDS);
1155                         if (rc != 0)
1156                                 result = rc;
1157                         GOTO(out_child, result);
1158                 }
1159         }
1160
1161         LASSERT(!lustre_handle_is_used(&lhc->mlh_reg_lh));
1162
1163         /* get openlock if this is not replay and if a client requested it */
1164         if (!(msg_flags & MSG_REPLAY) && create_flags & MDS_OPEN_LOCK) {
1165                 ldlm_mode_t lm;
1166
1167                 LASSERT(!created);
1168                 if (create_flags & FMODE_WRITE)
1169                         lm = LCK_CW;
1170                 else if (create_flags & MDS_FMODE_EXEC)
1171                         lm = LCK_PR;
1172                 else
1173                         lm = LCK_CR;
1174                 mdt_lock_handle_init(lhc);
1175                 mdt_lock_reg_init(lhc, lm);
1176                 rc = mdt_object_lock(info, child, lhc,
1177                                      MDS_INODELOCK_LOOKUP | MDS_INODELOCK_OPEN,
1178                                      MDT_CROSS_LOCK);
1179                 if (rc) {
1180                         result = rc;
1181                         GOTO(out_child, result);
1182                 } else {
1183                         result = -EREMOTE;
1184                         mdt_set_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1185                 }
1186         }
1187
1188         /* Try to open it now. */
1189         rc = mdt_finish_open(info, parent, child, create_flags,
1190                              created, ldlm_rep);
1191         if (rc) {
1192                 result = rc;
1193                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
1194                         /* openlock was acquired and mdt_finish_open failed -
1195                            drop the openlock */
1196                         mdt_object_unlock(info, child, lhc, 1);
1197                 if (created) {
1198                         ma->ma_need = 0;
1199                         ma->ma_valid = 0;
1200                         ma->ma_cookie_size = 0;
1201                         info->mti_no_need_trans = 1;
1202                         rc = mdo_unlink(info->mti_env,
1203                                         mdt_object_child(parent),
1204                                         mdt_object_child(child),
1205                                         lname,
1206                                         &info->mti_attr);
1207                         if (rc != 0)
1208                                 CERROR("Error in cleanup of open\n");
1209                 }
1210         }
1211         EXIT;
1212 out_child:
1213         mdt_object_put(info->mti_env, child);
1214 out_parent:
1215         mdt_object_unlock_put(info, parent, lh, result);
1216 out:
1217         if (result && result != -EREMOTE)
1218                 lustre_msg_set_transno(req->rq_repmsg, 0);
1219         return result;
1220 }
1221
1222 #define MFD_CLOSED(mode) (((mode) & ~(FMODE_EPOCH | FMODE_SOM | \
1223                                       FMODE_EPOCHLCK)) == FMODE_CLOSED)
1224
1225 static int mdt_mfd_closed(struct mdt_file_data *mfd)
1226 {
1227         return ((mfd == NULL) || MFD_CLOSED(mfd->mfd_mode));
1228 }
1229
1230 int mdt_mfd_close(struct mdt_thread_info *info, struct mdt_file_data *mfd)
1231 {
1232         struct mdt_object *o = mfd->mfd_object;
1233         struct md_object *next = mdt_object_child(o);
1234         struct md_attr *ma = &info->mti_attr;
1235         int rc = 0, ret = 0;
1236         int mode;
1237         ENTRY;
1238
1239         mode = mfd->mfd_mode;
1240
1241         if ((mode & FMODE_WRITE) || (mode & FMODE_EPOCHLCK)) {
1242                 mdt_write_put(info->mti_mdt, o);
1243                 ret = mdt_ioepoch_close(info, o);
1244         } else if (mode & MDS_FMODE_EXEC) {
1245                 mdt_write_allow(info->mti_mdt, o);
1246         } else if (mode & FMODE_EPOCH) {
1247                 ret = mdt_ioepoch_close(info, o);
1248         }
1249
1250         /* Update atime on close only. */
1251         if ((mode & MDS_FMODE_EXEC || mode & FMODE_READ || mode & FMODE_WRITE)
1252             && (ma->ma_valid & MA_INODE) && (ma->ma_attr.la_valid & LA_ATIME)) {
1253                 /* Set the atime only. */
1254                 ma->ma_attr.la_valid = LA_ATIME;
1255                 rc = mo_attr_set(info->mti_env, next, ma);
1256         }
1257
1258         ma->ma_need |= MA_INODE;
1259         ma->ma_valid = 0;
1260
1261         if (!MFD_CLOSED(mode))
1262                 rc = mo_close(info->mti_env, next, ma);
1263         else if (ret == -EAGAIN)
1264                 rc = mo_attr_get(info->mti_env, next, ma);
1265
1266         /* If the object is unlinked, do not try to re-enable SIZEONMDS */
1267         if ((ret == -EAGAIN) && (ma->ma_valid & MA_INODE) &&
1268             (ma->ma_attr.la_nlink == 0)) {
1269                 ret = 0;
1270         }
1271
1272         if ((ret == -EAGAIN) || (ret == 1)) {
1273                 struct mdt_export_data *med;
1274
1275                 /* The epoch has not closed or Size-on-MDS update is needed.
1276                  * Put mfd back into the list. */
1277                 LASSERT(mdt_conn_flags(info) & OBD_CONNECT_SOM);
1278                 mdt_mfd_set_mode(mfd, (ret == 1 ? FMODE_EPOCH : FMODE_SOM));
1279
1280                 LASSERT(mdt_info_req(info));
1281                 med = &mdt_info_req(info)->rq_export->exp_mdt_data;
1282                 spin_lock(&med->med_open_lock);
1283                 list_add(&mfd->mfd_list, &med->med_open_head);
1284                 class_handle_hash_back(&mfd->mfd_handle);
1285                 spin_unlock(&med->med_open_lock);
1286
1287                 if (ret == 1) {
1288                         ret = 0;
1289                 } else {
1290                         CDEBUG(D_INODE, "Size-on-MDS attribute update is "
1291                                "needed on "DFID"\n", PFID(mdt_object_fid(o)));
1292                 }
1293         } else {
1294                 mdt_mfd_free(mfd);
1295                 mdt_object_put(info->mti_env, o);
1296         }
1297
1298         RETURN(rc ? rc : ret);
1299 }
1300
1301 int mdt_close(struct mdt_thread_info *info)
1302 {
1303         struct mdt_export_data *med;
1304         struct mdt_file_data   *mfd;
1305         struct mdt_object      *o;
1306         struct md_attr         *ma = &info->mti_attr;
1307         struct mdt_body        *repbody = NULL;
1308         struct ptlrpc_request  *req = mdt_info_req(info);
1309         int rc, ret = 0;
1310         ENTRY;
1311
1312         /* Close may come with the Size-on-MDS update. Unpack it. */
1313         rc = mdt_close_unpack(info);
1314         if (rc)
1315                 RETURN(err_serious(rc));
1316
1317         LASSERT(info->mti_ioepoch);
1318
1319         req_capsule_set_size(info->mti_pill, &RMF_MDT_MD, RCL_SERVER,
1320                              info->mti_mdt->mdt_max_mdsize);
1321         req_capsule_set_size(info->mti_pill, &RMF_LOGCOOKIES, RCL_SERVER,
1322                              info->mti_mdt->mdt_max_cookiesize);
1323         rc = req_capsule_server_pack(info->mti_pill);
1324         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
1325                 if (rc == 0)
1326                         mdt_shrink_reply(info);
1327                 RETURN(lustre_msg_get_status(req->rq_repmsg));
1328         }
1329
1330         /* Continue to close handle even if we can not pack reply */
1331         if (rc == 0) {
1332                 repbody = req_capsule_server_get(info->mti_pill,
1333                                                  &RMF_MDT_BODY);
1334                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
1335                                                     &RMF_MDT_MD);
1336                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
1337                                                        &RMF_MDT_MD,
1338                                                        RCL_SERVER);
1339                 ma->ma_cookie = req_capsule_server_get(info->mti_pill,
1340                                                        &RMF_LOGCOOKIES);
1341                 ma->ma_cookie_size = req_capsule_get_size(info->mti_pill,
1342                                                           &RMF_LOGCOOKIES,
1343                                                           RCL_SERVER);
1344                 ma->ma_need = MA_INODE | MA_LOV | MA_COOKIE;
1345                 repbody->eadatasize = 0;
1346                 repbody->aclsize = 0;
1347         } else {
1348                 rc = err_serious(rc);
1349         }
1350
1351         med = &req->rq_export->exp_mdt_data;
1352         spin_lock(&med->med_open_lock);
1353         mfd = mdt_handle2mfd(info, &info->mti_ioepoch->handle);
1354         if (mdt_mfd_closed(mfd)) {
1355                 spin_unlock(&med->med_open_lock);
1356                 CDEBUG(D_INODE, "no handle for file close: fid = "DFID
1357                        ": cookie = "LPX64"\n", PFID(info->mti_rr.rr_fid1),
1358                        info->mti_ioepoch->handle.cookie);
1359                 /** not serious error since bug 3633 */
1360                 rc = -ESTALE;
1361         } else {
1362                 class_handle_unhash(&mfd->mfd_handle);
1363                 list_del_init(&mfd->mfd_list);
1364                 spin_unlock(&med->med_open_lock);
1365
1366                 /* Do not lose object before last unlink. */
1367                 o = mfd->mfd_object;
1368                 mdt_object_get(info->mti_env, o);
1369                 ret = mdt_mfd_close(info, mfd);
1370                 if (repbody != NULL)
1371                         rc = mdt_handle_last_unlink(info, o, ma);
1372                 mdt_empty_transno(info);
1373                 mdt_object_put(info->mti_env, o);
1374         }
1375         if (repbody != NULL)
1376                 mdt_shrink_reply(info);
1377
1378         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK))
1379                 RETURN(err_serious(-ENOMEM));
1380
1381         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_CLOSE_NET_REP,
1382                                  OBD_FAIL_MDS_CLOSE_NET_REP))
1383                 info->mti_fail_id = OBD_FAIL_MDS_CLOSE_NET_REP;
1384         RETURN(rc ? rc : ret);
1385 }
1386
1387 int mdt_done_writing(struct mdt_thread_info *info)
1388 {
1389         struct mdt_body         *repbody = NULL;
1390         struct mdt_export_data  *med;
1391         struct mdt_file_data    *mfd;
1392         int rc;
1393         ENTRY;
1394
1395         rc = req_capsule_server_pack(info->mti_pill);
1396         if (rc)
1397                 RETURN(err_serious(rc));
1398
1399         repbody = req_capsule_server_get(info->mti_pill,
1400                                          &RMF_MDT_BODY);
1401         repbody->eadatasize = 0;
1402         repbody->aclsize = 0;
1403
1404         /* Done Writing may come with the Size-on-MDS update. Unpack it. */
1405         rc = mdt_close_unpack(info);
1406         if (rc)
1407                 RETURN(err_serious(rc));
1408
1409         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL))
1410                 RETURN(lustre_msg_get_status(mdt_info_req(info)->rq_repmsg));
1411
1412         med = &info->mti_exp->exp_mdt_data;
1413         spin_lock(&med->med_open_lock);
1414         mfd = mdt_handle2mfd(info, &info->mti_ioepoch->handle);
1415         if (mfd == NULL) {
1416                 spin_unlock(&med->med_open_lock);
1417                 CDEBUG(D_INODE, "no handle for done write: fid = "DFID
1418                        ": cookie = "LPX64" ioepoch = "LPU64"\n",
1419                        PFID(info->mti_rr.rr_fid1),
1420                        info->mti_ioepoch->handle.cookie,
1421                        info->mti_ioepoch->ioepoch);
1422                 RETURN(-ESTALE);
1423         }
1424
1425         LASSERT(mfd->mfd_mode == FMODE_EPOCH ||
1426                 mfd->mfd_mode == FMODE_EPOCHLCK);
1427         class_handle_unhash(&mfd->mfd_handle);
1428         list_del_init(&mfd->mfd_list);
1429         spin_unlock(&med->med_open_lock);
1430
1431         /* Set EPOCH CLOSE flag if not set by client. */
1432         info->mti_ioepoch->flags |= MF_EPOCH_CLOSE;
1433         info->mti_attr.ma_valid = 0;
1434         rc = mdt_mfd_close(info, mfd);
1435         mdt_empty_transno(info);
1436         RETURN(rc);
1437 }