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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/mdt/mdt_open.c
  33  *
  34  * Lustre Metadata Target (mdt) open/close file handling
  35  *
  36  * Author: Huang Hua <huanghua@clusterfs.com>
  37  */
  38
  39 #define DEBUG_SUBSYSTEM S_MDS
  40
  41 #include <lustre_acl.h>
  42 #include <lustre_mds.h>
  43 #include "mdt_internal.h"
  44 #include <lustre_nodemap.h>
  45
  46 /* we do nothing because we do not have refcount now */
  47 static void mdt_mfd_get(void *mfdp)
  48 {
  49 }
  50
  51 static struct portals_handle_ops mfd_handle_ops = {
  52         .hop_addref = mdt_mfd_get,
  53         .hop_free   = NULL,
  54 };
  55
  56 /* Create a new mdt_file_data struct, initialize it,
  57  * and insert it to global hash table */
  58 struct mdt_file_data *mdt_mfd_new(const struct mdt_export_data *med)
  59 {
  60         struct mdt_file_data *mfd;
  61         ENTRY;
  62
  63         OBD_ALLOC_PTR(mfd);
  64         if (mfd != NULL) {
  65                 INIT_LIST_HEAD(&mfd->mfd_handle.h_link);
  66                 mfd->mfd_handle.h_owner = med;
  67                 INIT_LIST_HEAD(&mfd->mfd_list);
  68                 class_handle_hash(&mfd->mfd_handle, &mfd_handle_ops);
  69         }
  70
  71         RETURN(mfd);
  72 }
  73
  74 /*
  75  * Find the mfd pointed to by handle in global hash table.
  76  * In case of replay the handle is obsoleted
  77  * but mfd can be found in mfd list by that handle.
  78  * Callers need to be holding med_open_lock.
  79  */
  80 struct mdt_file_data *mdt_handle2mfd(struct mdt_export_data *med,
  81                                      const struct lustre_handle *handle,
  82                                      bool is_replay_or_resent)
  83 {
  84         struct mdt_file_data   *mfd;
  85         ENTRY;
  86
  87         LASSERT(handle != NULL);
  88         mfd = class_handle2object(handle->cookie, med);
  89         /* during dw/setattr replay the mfd can be found by old handle */
  90         if (mfd == NULL && is_replay_or_resent) {
  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
  98         RETURN(mfd);
  99 }
 100
 101 /* free mfd */
 102 void mdt_mfd_free(struct mdt_file_data *mfd)
 103 {
 104         LASSERT(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_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_lov_created = 1;
 131         }
 132
 133         mutex_unlock(&o->mot_lov_mutex);
 134         RETURN(rc);
 135 }
 136
 137 int mdt_write_read(struct mdt_object *o)
 138 {
 139         int rc = 0;
 140         ENTRY;
 141         spin_lock(&o->mot_write_lock);
 142         rc = o->mot_write_count;
 143         spin_unlock(&o->mot_write_lock);
 144         RETURN(rc);
 145 }
 146
 147 int mdt_write_get(struct mdt_object *o)
 148 {
 149         int rc = 0;
 150         ENTRY;
 151         spin_lock(&o->mot_write_lock);
 152         if (o->mot_write_count < 0)
 153                 rc = -ETXTBSY;
 154         else
 155                 o->mot_write_count++;
 156         spin_unlock(&o->mot_write_lock);
 157
 158         RETURN(rc);
 159 }
 160
 161 void mdt_write_put(struct mdt_object *o)
 162 {
 163         ENTRY;
 164         spin_lock(&o->mot_write_lock);
 165         o->mot_write_count--;
 166         spin_unlock(&o->mot_write_lock);
 167         EXIT;
 168 }
 169
 170 static int mdt_write_deny(struct mdt_object *o)
 171 {
 172         int rc = 0;
 173         ENTRY;
 174         spin_lock(&o->mot_write_lock);
 175         if (o->mot_write_count > 0)
 176                 rc = -ETXTBSY;
 177         else
 178                 o->mot_write_count--;
 179         spin_unlock(&o->mot_write_lock);
 180         RETURN(rc);
 181 }
 182
 183 static void mdt_write_allow(struct mdt_object *o)
 184 {
 185         ENTRY;
 186         spin_lock(&o->mot_write_lock);
 187         o->mot_write_count++;
 188         spin_unlock(&o->mot_write_lock);
 189         EXIT;
 190 }
 191
 192 /* there can be no real transaction so prepare the fake one */
 193 static void mdt_empty_transno(struct mdt_thread_info *info, int rc)
 194 {
 195         struct mdt_device      *mdt = info->mti_mdt;
 196         struct ptlrpc_request  *req = mdt_info_req(info);
 197         struct tg_export_data  *ted;
 198         struct lsd_client_data *lcd;
 199         ENTRY;
 200
 201         if (mdt_rdonly(req->rq_export))
 202                 RETURN_EXIT;
 203
 204         /* transaction has occurred already */
 205         if (lustre_msg_get_transno(req->rq_repmsg) != 0)
 206                 RETURN_EXIT;
 207
 208         if (tgt_is_multimodrpcs_client(req->rq_export)) {
 209                 struct thandle         *th;
 210
 211                 /* generate an empty transaction to get a transno
 212                  * and reply data */
 213                 th = dt_trans_create(info->mti_env, mdt->mdt_bottom);
 214                 if (!IS_ERR(th)) {
 215                         rc = dt_trans_start(info->mti_env, mdt->mdt_bottom, th);
 216                         dt_trans_stop(info->mti_env, mdt->mdt_bottom, th);
 217                 }
 218                 RETURN_EXIT;
 219         }
 220
 221         spin_lock(&mdt->mdt_lut.lut_translock);
 222         if (rc != 0) {
 223                 if (info->mti_transno != 0) {
 224                         struct obd_export *exp = req->rq_export;
 225
 226                         CERROR("%s: replay trans %llu NID %s: rc = %d\n",
 227                                mdt_obd_name(mdt), info->mti_transno,
 228                                libcfs_nid2str(exp->exp_connection->c_peer.nid),
 229                                rc);
 230                         spin_unlock(&mdt->mdt_lut.lut_translock);
 231                         RETURN_EXIT;
 232                 }
 233         } else if (info->mti_transno == 0) {
 234                 info->mti_transno = ++mdt->mdt_lut.lut_last_transno;
 235         } else {
 236                 /* should be replay */
 237                 if (info->mti_transno > mdt->mdt_lut.lut_last_transno)
 238                         mdt->mdt_lut.lut_last_transno = info->mti_transno;
 239         }
 240         spin_unlock(&mdt->mdt_lut.lut_translock);
 241
 242         CDEBUG(D_INODE, "transno = %llu, last_committed = %llu\n",
 243                info->mti_transno,
 244                req->rq_export->exp_obd->obd_last_committed);
 245
 246         req->rq_transno = info->mti_transno;
 247         lustre_msg_set_transno(req->rq_repmsg, info->mti_transno);
 248
 249         /* update lcd in memory only for resent cases */
 250         ted = &req->rq_export->exp_target_data;
 251         LASSERT(ted);
 252         mutex_lock(&ted->ted_lcd_lock);
 253         lcd = ted->ted_lcd;
 254         if (info->mti_transno < lcd->lcd_last_transno &&
 255             info->mti_transno != 0) {
 256                 /* This should happen during replay. Do not update
 257                  * last rcvd info if replay req transno < last transno,
 258                  * otherwise the following resend(after replay) can not
 259                  * be checked correctly by xid */
 260                 mutex_unlock(&ted->ted_lcd_lock);
 261                 CDEBUG(D_HA, "%s: transno = %llu < last_transno = %llu\n",
 262                        mdt_obd_name(mdt), info->mti_transno,
 263                        lcd->lcd_last_transno);
 264                 RETURN_EXIT;
 265         }
 266
 267         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
 268                 if (info->mti_transno != 0)
 269                         lcd->lcd_last_close_transno = info->mti_transno;
 270                 lcd->lcd_last_close_xid = req->rq_xid;
 271                 lcd->lcd_last_close_result = rc;
 272         } else {
 273                 /* VBR: save versions in last_rcvd for reconstruct. */
 274                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 275                 if (pre_versions) {
 276                         lcd->lcd_pre_versions[0] = pre_versions[0];
 277                         lcd->lcd_pre_versions[1] = pre_versions[1];
 278                         lcd->lcd_pre_versions[2] = pre_versions[2];
 279                         lcd->lcd_pre_versions[3] = pre_versions[3];
 280                 }
 281                 if (info->mti_transno != 0)
 282                         lcd->lcd_last_transno = info->mti_transno;
 283
 284                 lcd->lcd_last_xid = req->rq_xid;
 285                 lcd->lcd_last_result = rc;
 286                 lcd->lcd_last_data = info->mti_opdata;
 287         }
 288         mutex_unlock(&ted->ted_lcd_lock);
 289
 290         EXIT;
 291 }
 292
 293 void mdt_mfd_set_mode(struct mdt_file_data *mfd, __u64 mode)
 294 {
 295         LASSERT(mfd != NULL);
 296
 297         CDEBUG(D_DENTRY, DFID " Change mfd mode %#llo -> %#llo.\n",
 298                PFID(mdt_object_fid(mfd->mfd_object)), mfd->mfd_mode, mode);
 299
 300         mfd->mfd_mode = mode;
 301 }
 302
 303 /**
 304  * prep ma_lmm/ma_lmv for md_attr from reply
 305  */
 306 static void mdt_prep_ma_buf_from_rep(struct mdt_thread_info *info,
 307                                      struct mdt_object *obj,
 308                                      struct md_attr *ma)
 309 {
 310         LASSERT(ma->ma_lmv == NULL && ma->ma_lmm == NULL);
 311         if (S_ISDIR(obj->mot_header.loh_attr)) {
 312                 ma->ma_lmv = req_capsule_server_get(info->mti_pill,
 313                                                     &RMF_MDT_MD);
 314                 ma->ma_lmv_size = req_capsule_get_size(info->mti_pill,
 315                                                        &RMF_MDT_MD,
 316                                                        RCL_SERVER);
 317                 if (ma->ma_lmv_size > 0)
 318                         ma->ma_need |= MA_LMV;
 319         } else {
 320                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
 321                                                     &RMF_MDT_MD);
 322                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 323                                                        &RMF_MDT_MD,
 324                                                        RCL_SERVER);
 325                 if (ma->ma_lmm_size > 0)
 326                         ma->ma_need |= MA_LOV;
 327         }
 328 }
 329
 330 static int mdt_mfd_open(struct mdt_thread_info *info, struct mdt_object *p,
 331                         struct mdt_object *o, __u64 flags, int created,
 332                         struct ldlm_reply *rep)
 333 {
 334         struct ptlrpc_request   *req = mdt_info_req(info);
 335         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 336         struct mdt_file_data    *mfd;
 337         struct md_attr          *ma  = &info->mti_attr;
 338         struct lu_attr          *la  = &ma->ma_attr;
 339         struct mdt_body         *repbody;
 340         int                      rc = 0, isdir, isreg;
 341         ENTRY;
 342
 343         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 344
 345         isreg = S_ISREG(la->la_mode);
 346         isdir = S_ISDIR(la->la_mode);
 347         if (isreg && !(ma->ma_valid & MA_LOV) && !(flags & MDS_OPEN_RELEASE)) {
 348                 /*
 349                  * No EA, check whether it is will set regEA and dirEA since in
 350                  * above attr get, these size might be zero, so reset it, to
 351                  * retrieve the MD after create obj.
 352                  */
 353                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
 354                                                        &RMF_MDT_MD,
 355                                                        RCL_SERVER);
 356                 /* in replay case, p == NULL */
 357                 rc = mdt_create_data(info, p, o);
 358                 if (rc)
 359                         RETURN(rc);
 360
 361                 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_DISP_STRIPE)
 362                         mdt_set_disposition(info, rep, DISP_OPEN_STRIPE);
 363         }
 364
 365         CDEBUG(D_INODE, "after open, ma_valid bit = %#llx lmm_size = %d\n",
 366                ma->ma_valid, ma->ma_lmm_size);
 367
 368         if (ma->ma_valid & MA_LOV) {
 369                 LASSERT(ma->ma_lmm_size != 0);
 370                 repbody->mbo_eadatasize = ma->ma_lmm_size;
 371                 if (isdir)
 372                         repbody->mbo_valid |= OBD_MD_FLDIREA;
 373                 else
 374                         repbody->mbo_valid |= OBD_MD_FLEASIZE;
 375         }
 376
 377         if (ma->ma_valid & MA_LMV) {
 378                 LASSERT(ma->ma_lmv_size != 0);
 379                 repbody->mbo_eadatasize = ma->ma_lmv_size;
 380                 LASSERT(isdir);
 381                 repbody->mbo_valid |= OBD_MD_FLDIREA | OBD_MD_MEA;
 382         }
 383
 384         if (flags & FMODE_WRITE)
 385                 rc = mdt_write_get(o);
 386         else if (flags & MDS_FMODE_EXEC)
 387                 rc = mdt_write_deny(o);
 388
 389         if (rc)
 390                 RETURN(rc);
 391
 392         rc = mo_open(info->mti_env, mdt_object_child(o),
 393                      created ? flags | MDS_OPEN_CREATED : flags);
 394         if (rc != 0) {
 395                 /* If we allow the client to chgrp (CFS_SETGRP_PERM), but the
 396                  * client does not know which suppgid should be sent to the MDS,
 397                  * or some other(s) changed the target file's GID after this RPC
 398                  * sent to the MDS with the suppgid as the original GID, then we
 399                  * give the client another chance to send the right suppgid. */
 400                 if (rc == -EACCES &&
 401                     allow_client_chgrp(info, lu_ucred(info->mti_env)))
 402                         mdt_set_disposition(info, rep, DISP_OPEN_DENY);
 403
 404                 GOTO(err_out, rc);
 405         }
 406
 407         mfd = mdt_mfd_new(med);
 408         if (mfd == NULL)
 409                 GOTO(err_out, rc = -ENOMEM);
 410
 411         /*
 412          * Keep a reference on this object for this open, and is
 413          * released by mdt_mfd_close().
 414          */
 415         mdt_object_get(info->mti_env, o);
 416         mfd->mfd_object = o;
 417         mfd->mfd_xid = req->rq_xid;
 418
 419         /*
 420          * @flags is always not zero. At least it should be FMODE_READ,
 421          * FMODE_WRITE or MDS_FMODE_EXEC.
 422          */
 423         LASSERT(flags != 0);
 424
 425         /* Open handling. */
 426         mdt_mfd_set_mode(mfd, flags);
 427
 428         atomic_inc(&o->mot_open_count);
 429         if (flags & MDS_OPEN_LEASE)
 430                 atomic_inc(&o->mot_lease_count);
 431
 432         /* replay handle */
 433         if (req_is_replay(req)) {
 434                 struct mdt_file_data *old_mfd;
 435                 /* Check wheather old cookie already exist in
 436                  * the list, becasue when do recovery, client
 437                  * might be disconnected from server, and
 438                  * restart replay, so there maybe some orphan
 439                  * mfd here, we should remove them */
 440                 LASSERT(info->mti_rr.rr_handle != NULL);
 441                 spin_lock(&med->med_open_lock);
 442                 old_mfd = mdt_handle2mfd(med, info->mti_rr.rr_handle, true);
 443                 if (old_mfd != NULL) {
 444                         CDEBUG(D_HA, "delete orphan mfd = %p, fid = "DFID", "
 445                                "cookie = %#llx\n", mfd,
 446                                PFID(mdt_object_fid(mfd->mfd_object)),
 447                                info->mti_rr.rr_handle->cookie);
 448                         class_handle_unhash(&old_mfd->mfd_handle);
 449                         list_del_init(&old_mfd->mfd_list);
 450                         spin_unlock(&med->med_open_lock);
 451                         /* no attr update for that close */
 452                         la->la_valid = 0;
 453                         ma->ma_valid |= MA_FLAGS;
 454                         ma->ma_attr_flags |= MDS_RECOV_OPEN;
 455                         mdt_mfd_close(info, old_mfd);
 456                         ma->ma_attr_flags &= ~MDS_RECOV_OPEN;
 457                         ma->ma_valid &= ~MA_FLAGS;
 458                 } else {
 459                         spin_unlock(&med->med_open_lock);
 460                         CDEBUG(D_HA, "orphan mfd not found, fid = "DFID", "
 461                                "cookie = %#llx\n",
 462                                PFID(mdt_object_fid(mfd->mfd_object)),
 463                                info->mti_rr.rr_handle->cookie);
 464                 }
 465
 466                 CDEBUG(D_HA, "Store old cookie %#llx in new mfd\n",
 467                        info->mti_rr.rr_handle->cookie);
 468
 469                 mfd->mfd_old_handle.cookie = info->mti_rr.rr_handle->cookie;
 470         }
 471
 472         repbody->mbo_handle.cookie = mfd->mfd_handle.h_cookie;
 473
 474         if (req->rq_export->exp_disconnected) {
 475                 spin_lock(&med->med_open_lock);
 476                 class_handle_unhash(&mfd->mfd_handle);
 477                 list_del_init(&mfd->mfd_list);
 478                 spin_unlock(&med->med_open_lock);
 479                 mdt_mfd_close(info, mfd);
 480         } else {
 481                 spin_lock(&med->med_open_lock);
 482                 list_add_tail(&mfd->mfd_list, &med->med_open_head);
 483                 spin_unlock(&med->med_open_lock);
 484         }
 485
 486         mdt_empty_transno(info, rc);
 487
 488         RETURN(rc);
 489
 490 err_out:
 491         if (flags & FMODE_WRITE)
 492                 mdt_write_put(o);
 493         else if (flags & MDS_FMODE_EXEC)
 494                 mdt_write_allow(o);
 495
 496         return rc;
 497 }
 498
 499 static int mdt_finish_open(struct mdt_thread_info *info,
 500                            struct mdt_object *p, struct mdt_object *o,
 501                            __u64 flags, int created, struct ldlm_reply *rep)
 502 {
 503         struct ptlrpc_request   *req = mdt_info_req(info);
 504         struct obd_export       *exp = req->rq_export;
 505         struct mdt_export_data  *med = &req->rq_export->exp_mdt_data;
 506         struct md_attr          *ma  = &info->mti_attr;
 507         struct lu_attr          *la  = &ma->ma_attr;
 508         struct mdt_file_data    *mfd;
 509         struct mdt_body         *repbody;
 510         int                      rc = 0;
 511         int                      isreg, isdir, islnk;
 512         struct list_head        *t;
 513         ENTRY;
 514
 515         LASSERT(ma->ma_valid & MA_INODE);
 516
 517         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 518
 519         isreg = S_ISREG(la->la_mode);
 520         isdir = S_ISDIR(la->la_mode);
 521         islnk = S_ISLNK(la->la_mode);
 522         mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 523
 524         /* LU-2275, simulate broken behaviour (esp. prevalent in
 525          * pre-2.4 servers where a very strange reply is sent on error
 526          * that looks like it was actually almost successful and a
 527          * failure at the same time.) */
 528         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_NEGATIVE_POSITIVE)) {
 529                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN |
 530                                                DISP_LOOKUP_NEG |
 531                                                DISP_LOOKUP_POS);
 532
 533                 if (flags & MDS_OPEN_LOCK)
 534                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
 535
 536                 RETURN(-ENOENT);
 537         }
 538
 539 #ifdef CONFIG_FS_POSIX_ACL
 540         if (exp_connect_flags(exp) & OBD_CONNECT_ACL) {
 541                 struct lu_nodemap *nodemap = nodemap_get_from_exp(exp);
 542                 if (IS_ERR(nodemap))
 543                         RETURN(PTR_ERR(nodemap));
 544
 545                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
 546                 nodemap_putref(nodemap);
 547                 if (rc)
 548                         RETURN(rc);
 549         }
 550 #endif
 551
 552         /*
 553          * If we are following a symlink, don't open; and do not return open
 554          * handle for special nodes as client required.
 555          */
 556         if (islnk || (!isreg && !isdir &&
 557             (exp_connect_flags(req->rq_export) & OBD_CONNECT_NODEVOH))) {
 558                 lustre_msg_set_transno(req->rq_repmsg, 0);
 559                 RETURN(0);
 560         }
 561
 562         /*
 563          * We need to return the existing object's fid back, so it is done here,
 564          * after preparing the reply.
 565          */
 566         if (!created && (flags & MDS_OPEN_EXCL) && (flags & MDS_OPEN_CREAT))
 567                 RETURN(-EEXIST);
 568
 569         /* This can't be done earlier, we need to return reply body */
 570         if (isdir) {
 571                 if (flags & (MDS_OPEN_CREAT | FMODE_WRITE)) {
 572                         /* We are trying to create or write an existing dir. */
 573                         RETURN(-EISDIR);
 574                 }
 575         } else if (flags & MDS_OPEN_DIRECTORY)
 576                 RETURN(-ENOTDIR);
 577
 578         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_OPEN_CREATE,
 579                                  OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE)) {
 580                 RETURN(-EAGAIN);
 581         }
 582
 583         mfd = NULL;
 584         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
 585                 spin_lock(&med->med_open_lock);
 586                 list_for_each(t, &med->med_open_head) {
 587                         mfd = list_entry(t, struct mdt_file_data, mfd_list);
 588                         if (mfd->mfd_xid == req->rq_xid)
 589                                 break;
 590                         mfd = NULL;
 591                 }
 592                 spin_unlock(&med->med_open_lock);
 593
 594                 if (mfd != NULL) {
 595                         repbody->mbo_handle.cookie = mfd->mfd_handle.h_cookie;
 596                         /* set repbody->ea_size for resent case */
 597                         if (ma->ma_valid & MA_LOV) {
 598                                 LASSERT(ma->ma_lmm_size != 0);
 599                                 repbody->mbo_eadatasize = ma->ma_lmm_size;
 600                                 if (isdir)
 601                                         repbody->mbo_valid |= OBD_MD_FLDIREA;
 602                                 else
 603                                         repbody->mbo_valid |= OBD_MD_FLEASIZE;
 604                         }
 605                         mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 606                         RETURN(0);
 607                 }
 608         }
 609
 610         rc = mdt_mfd_open(info, p, o, flags, created, rep);
 611         if (!rc)
 612                 mdt_set_disposition(info, rep, DISP_OPEN_OPEN);
 613
 614         RETURN(rc);
 615 }
 616
 617 void mdt_reconstruct_open(struct mdt_thread_info *info,
 618                           struct mdt_lock_handle *lhc)
 619 {
 620         const struct lu_env *env = info->mti_env;
 621         struct mdt_device       *mdt  = info->mti_mdt;
 622         struct req_capsule      *pill = info->mti_pill;
 623         struct ptlrpc_request   *req  = mdt_info_req(info);
 624         struct md_attr          *ma   = &info->mti_attr;
 625         struct mdt_reint_record *rr   = &info->mti_rr;
 626         __u64                   flags = info->mti_spec.sp_cr_flags;
 627         struct ldlm_reply       *ldlm_rep;
 628         struct mdt_object       *parent;
 629         struct mdt_object       *child;
 630         struct mdt_body         *repbody;
 631         int                      rc;
 632         __u64                    opdata;
 633         ENTRY;
 634
 635         LASSERT(pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
 636         ldlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
 637         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 638
 639         ma->ma_need = MA_INODE | MA_HSM;
 640         ma->ma_valid = 0;
 641
 642         opdata = mdt_req_from_lrd(req, info->mti_reply_data);
 643         mdt_set_disposition(info, ldlm_rep, opdata);
 644
 645         CDEBUG(D_INODE, "This is reconstruct open: disp=%#llx, result=%d\n",
 646                ldlm_rep->lock_policy_res1, req->rq_status);
 647
 648         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE) &&
 649             req->rq_status != 0)
 650                 /* We did not create successfully, return error to client. */
 651                 GOTO(out, rc = req->rq_status);
 652
 653         if (mdt_get_disposition(ldlm_rep, DISP_OPEN_CREATE)) {
 654                 struct obd_export *exp = req->rq_export;
 655                 /*
 656                  * We failed after creation, but we do not know in which step
 657                  * we failed. So try to check the child object.
 658                  */
 659                 parent = mdt_object_find(env, mdt, rr->rr_fid1);
 660                 if (IS_ERR(parent)) {
 661                         rc = PTR_ERR(parent);
 662                         LCONSOLE_WARN("Parent "DFID" lookup error %d."
 663                                       " Evicting client %s with export %s.\n",
 664                                       PFID(rr->rr_fid1), rc,
 665                                       obd_uuid2str(&exp->exp_client_uuid),
 666                                       obd_export_nid2str(exp));
 667                         mdt_export_evict(exp);
 668                         RETURN_EXIT;
 669                 }
 670
 671                 child = mdt_object_find(env, mdt, rr->rr_fid2);
 672                 if (IS_ERR(child)) {
 673                         rc = PTR_ERR(child);
 674                         LCONSOLE_WARN("cannot lookup child "DFID": rc = %d; "
 675                                       "evicting client %s with export %s\n",
 676                                       PFID(rr->rr_fid2), rc,
 677                                       obd_uuid2str(&exp->exp_client_uuid),
 678                                       obd_export_nid2str(exp));
 679                         mdt_object_put(env, parent);
 680                         mdt_export_evict(exp);
 681                         RETURN_EXIT;
 682                 }
 683
 684                 if (unlikely(mdt_object_remote(child))) {
 685                         /* the child object was created on remote server */
 686                         if (!mdt_is_dne_client(exp)) {
 687                                 /* Return -EIO for old client */
 688                                 mdt_object_put(env, parent);
 689                                 mdt_object_put(env, child);
 690                                 GOTO(out, rc = -EIO);
 691                         }
 692                         repbody->mbo_fid1 = *rr->rr_fid2;
 693                         repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
 694                         rc = 0;
 695                 } else {
 696                         if (mdt_object_exists(child)) {
 697                                 mdt_prep_ma_buf_from_rep(info, child, ma);
 698                                 rc = mdt_attr_get_complex(info, child, ma);
 699                                 if (rc == 0)
 700                                         rc = mdt_finish_open(info, parent,
 701                                                              child, flags,
 702                                                              1, ldlm_rep);
 703                         } else {
 704                                 /* the child does not exist, we should do
 705                                  * regular open */
 706                                 mdt_object_put(env, parent);
 707                                 mdt_object_put(env, child);
 708                                 GOTO(regular_open, 0);
 709                         }
 710                 }
 711                 mdt_object_put(env, parent);
 712                 mdt_object_put(env, child);
 713                 GOTO(out, rc);
 714         } else {
 715 regular_open:
 716                 /* We did not try to create, so we are a pure open */
 717                 rc = mdt_reint_open(info, lhc);
 718         }
 719
 720         EXIT;
 721 out:
 722         req->rq_status = rc;
 723         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
 724         LASSERT(ergo(rc < 0, lustre_msg_get_transno(req->rq_repmsg) == 0));
 725 }
 726
 727 static int mdt_open_by_fid(struct mdt_thread_info *info, struct ldlm_reply *rep)
 728 {
 729         __u64                    flags = info->mti_spec.sp_cr_flags;
 730         struct mdt_reint_record *rr = &info->mti_rr;
 731         struct md_attr          *ma = &info->mti_attr;
 732         struct mdt_object       *o;
 733         int                      rc;
 734         ENTRY;
 735
 736         o = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
 737         if (IS_ERR(o))
 738                 RETURN(rc = PTR_ERR(o));
 739
 740         if (unlikely(mdt_object_remote(o))) {
 741                 /* the child object was created on remote server */
 742                 struct mdt_body *repbody;
 743
 744                 mdt_set_disposition(info, rep, (DISP_IT_EXECD |
 745                                                 DISP_LOOKUP_EXECD |
 746                                                 DISP_LOOKUP_POS));
 747                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 748                 repbody->mbo_fid1 = *rr->rr_fid2;
 749                 repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
 750                 rc = 0;
 751         } else {
 752                 if (mdt_object_exists(o)) {
 753                         mdt_set_disposition(info, rep, (DISP_IT_EXECD |
 754                                                         DISP_LOOKUP_EXECD |
 755                                                         DISP_LOOKUP_POS));
 756                         mdt_prep_ma_buf_from_rep(info, o, ma);
 757                         rc = mdt_attr_get_complex(info, o, ma);
 758                         if (rc == 0)
 759                                 rc = mdt_finish_open(info, NULL, o, flags, 0,
 760                                                      rep);
 761                 } else {
 762                         rc = -ENOENT;
 763                 }
 764         }
 765
 766         mdt_object_put(info->mti_env, o);
 767         RETURN(rc);
 768 }
 769
 770 /* lock object for open */
 771 static int mdt_object_open_lock(struct mdt_thread_info *info,
 772                                 struct mdt_object *obj,
 773                                 struct mdt_lock_handle *lhc,
 774                                 __u64 *ibits)
 775 {
 776         struct md_attr *ma = &info->mti_attr;
 777         __u64 open_flags = info->mti_spec.sp_cr_flags;
 778         enum ldlm_mode lm = LCK_CR;
 779         bool acq_lease = !!(open_flags & MDS_OPEN_LEASE);
 780         bool try_layout = false;
 781         bool create_layout = false;
 782         int rc = 0;
 783         ENTRY;
 784
 785         *ibits = 0;
 786         mdt_lock_handle_init(lhc);
 787
 788         if (req_is_replay(mdt_info_req(info)))
 789                 RETURN(0);
 790
 791         if (S_ISREG(lu_object_attr(&obj->mot_obj))) {
 792                 if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV) &&
 793                     md_should_create(open_flags))
 794                         create_layout = true;
 795                 if (exp_connect_layout(info->mti_exp) && !create_layout &&
 796                     ma->ma_need & MA_LOV)
 797                         try_layout = true;
 798         }
 799
 800         if (acq_lease) {
 801                 /* lease open, acquire write mode of open sem */
 802                 down_write(&obj->mot_open_sem);
 803
 804                 /* Lease exists and ask for new lease */
 805                 if (atomic_read(&obj->mot_lease_count) > 0) {
 806                         /* only exclusive open is supported, so lease
 807                          * are conflicted to each other */
 808                         GOTO(out, rc = -EBUSY);
 809                 }
 810
 811                 /* Lease must be with open lock */
 812                 if (!(open_flags & MDS_OPEN_LOCK)) {
 813                         CERROR("%s: Request lease for file:"DFID ", but open lock "
 814                                "is missed, open_flags = %#llo : rc = %d\n",
 815                                mdt_obd_name(info->mti_mdt),
 816                                PFID(mdt_object_fid(obj)), open_flags, -EPROTO);
 817                         GOTO(out, rc = -EPROTO);
 818                 }
 819
 820                 /* XXX: only exclusive open is supported. */
 821                 lm = LCK_EX;
 822                 *ibits = MDS_INODELOCK_OPEN;
 823
 824                 /* never grant LCK_EX layout lock to client */
 825                 try_layout = false;
 826         } else { /* normal open */
 827                 /* normal open holds read mode of open sem */
 828                 down_read(&obj->mot_open_sem);
 829
 830                 if (open_flags & MDS_OPEN_LOCK) {
 831                         if (open_flags & FMODE_WRITE)
 832                                 lm = LCK_CW;
 833                         else if (open_flags & MDS_FMODE_EXEC)
 834                                 lm = LCK_PR;
 835                         else
 836                                 lm = LCK_CR;
 837
 838                         *ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_OPEN;
 839                 } else if (atomic_read(&obj->mot_lease_count) > 0) {
 840                         if (open_flags & FMODE_WRITE)
 841                                 lm = LCK_CW;
 842                         else
 843                                 lm = LCK_CR;
 844
 845                         /* revoke lease */
 846                         *ibits = MDS_INODELOCK_OPEN;
 847                         try_layout = false;
 848
 849                         lhc = &info->mti_lh[MDT_LH_LOCAL];
 850                 }
 851                 CDEBUG(D_INODE, "normal open:"DFID" lease count: %d, lm: %d\n",
 852                         PFID(mdt_object_fid(obj)),
 853                         atomic_read(&obj->mot_open_count), lm);
 854         }
 855
 856         mdt_lock_reg_init(lhc, lm);
 857
 858         /* one problem to return layout lock on open is that it may result
 859          * in too many layout locks cached on the client side. */
 860         if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_OPEN) && try_layout) {
 861                 /* return lookup lock to validate inode at the client side,
 862                  * this is pretty important otherwise mdt will return layout
 863                  * lock for each open.
 864                  * However this is a double-edged sword because changing
 865                  * permission will revoke huge # of LOOKUP locks. */
 866                 rc = mdt_object_lock_try(info, obj, lhc, ibits,
 867                                          MDS_INODELOCK_LAYOUT |
 868                                          MDS_INODELOCK_LOOKUP, false);
 869         } else if (*ibits != 0) {
 870                 rc = mdt_object_lock(info, obj, lhc, *ibits);
 871         }
 872
 873         CDEBUG(D_INODE, "%s: Requested bits lock:"DFID ", ibits = %#llx"
 874                ", open_flags = %#llo, try_layout = %d : rc = %d\n",
 875                mdt_obd_name(info->mti_mdt), PFID(mdt_object_fid(obj)),
 876                *ibits, open_flags, try_layout, rc);
 877
 878         /* will change layout, revoke layout locks by enqueuing EX lock. */
 879         if (rc == 0 && create_layout) {
 880                 struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LAYOUT];
 881
 882                 CDEBUG(D_INODE, "Will create layout, get EX layout lock:"DFID
 883                         ", open_flags = %#llo\n",
 884                         PFID(mdt_object_fid(obj)), open_flags);
 885
 886                 /* We cannot enqueue another lock for the same resource we
 887                  * already have a lock for, due to mechanics of waiting list
 888                  * iterating in ldlm, see LU-3601.
 889                  * As such we'll drop the open lock we just got above here,
 890                  * it's ok not to have this open lock as it's main purpose is to
 891                  * flush unused cached client open handles. */
 892                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
 893                         mdt_object_unlock(info, obj, lhc, 1);
 894
 895                 LASSERT(!try_layout);
 896                 mdt_lock_handle_init(ll);
 897                 mdt_lock_reg_init(ll, LCK_EX);
 898                 rc = mdt_object_lock(info, obj, ll, MDS_INODELOCK_LAYOUT);
 899
 900                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_LL_BLOCK, 2);
 901         }
 902
 903         /* Check if there is any other open handles after acquiring
 904          * open lock. At this point, caching open handles have been revoked
 905          * by open lock.
 906          * XXX: Now only exclusive open is supported. Need to check the
 907          * type of open for generic lease support. */
 908         if (rc == 0 && acq_lease) {
 909                 struct ptlrpc_request *req = mdt_info_req(info);
 910                 struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
 911                 struct mdt_file_data *mfd;
 912                 bool is_replay_or_resent;
 913                 int open_count = 0;
 914
 915                 /* For lease: application can open a file and then apply lease,
 916                  * @handle contains original open handle in that case.
 917                  * In recovery, open REQ will be replayed and the lease REQ may
 918                  * be resent that means the open handle is already stale, so we
 919                  * need to fix it up here by finding new handle. */
 920                 is_replay_or_resent = req_is_replay(req) ||
 921                         lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT;
 922
 923                 /* if the request is _not_ a replay request, rr_handle
 924                  * may be used to hold an openhandle which is issuing the
 925                  * lease request, so that this openhandle doesn't count. */
 926                 mfd = mdt_handle2mfd(med, info->mti_rr.rr_handle,
 927                                      is_replay_or_resent);
 928                 if (mfd != NULL)
 929                         ++open_count;
 930
 931                 CDEBUG(D_INODE, "acq_lease "DFID": openers: %d, want: %d\n",
 932                         PFID(mdt_object_fid(obj)),
 933                         atomic_read(&obj->mot_open_count), open_count);
 934
 935                 if (atomic_read(&obj->mot_open_count) > open_count)
 936                         GOTO(out, rc = -EBUSY);
 937         }
 938         GOTO(out, rc);
 939
 940 out:
 941         RETURN(rc);
 942 }
 943
 944 static void mdt_object_open_unlock(struct mdt_thread_info *info,
 945                                    struct mdt_object *obj,
 946                                    struct mdt_lock_handle *lhc,
 947                                    __u64 ibits, int rc)
 948 {
 949         __u64 open_flags = info->mti_spec.sp_cr_flags;
 950         struct mdt_lock_handle *ll = &info->mti_lh[MDT_LH_LOCAL];
 951         ENTRY;
 952
 953         if (req_is_replay(mdt_info_req(info)))
 954                 RETURN_EXIT;
 955
 956         /* Release local lock - the lock put in MDT_LH_LOCAL will never
 957          * return to client side. */
 958         if (lustre_handle_is_used(&ll->mlh_reg_lh))
 959                 mdt_object_unlock(info, obj, ll, 1);
 960
 961         ll = &info->mti_lh[MDT_LH_LAYOUT];
 962         /* Release local layout lock, layout was created */
 963         if (lustre_handle_is_used(&ll->mlh_reg_lh)) {
 964                 LASSERT(!(ibits & MDS_INODELOCK_LAYOUT));
 965                 mdt_object_unlock(info, obj, ll, 1);
 966         }
 967
 968         if (open_flags & MDS_OPEN_LEASE)
 969                 up_write(&obj->mot_open_sem);
 970         else
 971                 up_read(&obj->mot_open_sem);
 972
 973         /* Cross-ref case, the lock should be returned to the client */
 974         if (ibits == 0 || rc == -MDT_EREMOTE_OPEN)
 975                 RETURN_EXIT;
 976
 977         if (!(open_flags & MDS_OPEN_LOCK) && !(ibits & MDS_INODELOCK_LAYOUT)) {
 978                 /* for the open request, the lock will only return to client
 979                  * if open or layout lock is granted. */
 980                 rc = 1;
 981         }
 982
 983         if (rc != 0 || !lustre_handle_is_used(&lhc->mlh_reg_lh)) {
 984                 struct ldlm_reply       *ldlm_rep;
 985
 986                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
 987                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
 988                 if (lustre_handle_is_used(&lhc->mlh_reg_lh))
 989                         mdt_object_unlock(info, obj, lhc, 1);
 990         }
 991         RETURN_EXIT;
 992 }
 993
 994 /**
 995  * Check release is permitted for the current HSM flags.
 996  */
 997 static bool mdt_hsm_release_allow(const struct md_attr *ma)
 998 {
 999         if (!(ma->ma_valid & MA_HSM))
1000                 return false;
1001
1002         if (ma->ma_hsm.mh_flags & (HS_DIRTY|HS_NORELEASE|HS_LOST))
1003                 return false;
1004
1005         if (!(ma->ma_hsm.mh_flags & HS_ARCHIVED))
1006                 return false;
1007
1008         return true;
1009 }
1010
1011 static int mdt_open_by_fid_lock(struct mdt_thread_info *info,
1012                                 struct ldlm_reply *rep,
1013                                 struct mdt_lock_handle *lhc)
1014 {
1015         const struct lu_env     *env   = info->mti_env;
1016         struct mdt_device       *mdt   = info->mti_mdt;
1017         __u64                    flags = info->mti_spec.sp_cr_flags;
1018         struct mdt_reint_record *rr    = &info->mti_rr;
1019         struct md_attr          *ma    = &info->mti_attr;
1020         struct mdt_object       *parent= NULL;
1021         struct mdt_object       *o;
1022         int                      rc;
1023         bool                     object_locked = false;
1024         __u64                    ibits = 0;
1025         ENTRY;
1026
1027         if (md_should_create(flags) && !(flags & MDS_OPEN_HAS_EA)) {
1028                 if (!lu_fid_eq(rr->rr_fid1, rr->rr_fid2)) {
1029                         parent = mdt_object_find(env, mdt, rr->rr_fid1);
1030                         if (IS_ERR(parent)) {
1031                                 CDEBUG(D_INODE, "Fail to find parent "DFID
1032                                        " for anonymous created %ld, try to"
1033                                        " use server-side parent.\n",
1034                                        PFID(rr->rr_fid1), PTR_ERR(parent));
1035                                 parent = NULL;
1036                         }
1037                 }
1038                 if (parent == NULL)
1039                         ma->ma_need |= MA_PFID;
1040         }
1041
1042         o = mdt_object_find(env, mdt, rr->rr_fid2);
1043         if (IS_ERR(o))
1044                 GOTO(out_parent_put, rc = PTR_ERR(o));
1045
1046         if (mdt_object_remote(o)) {
1047                 CDEBUG(D_INFO, "%s: "DFID" is on remote MDT.\n",
1048                        mdt_obd_name(info->mti_mdt),
1049                        PFID(rr->rr_fid2));
1050                 GOTO(out, rc = -EREMOTE);
1051         } else if (!mdt_object_exists(o)) {
1052                 mdt_set_disposition(info, rep,
1053                                     DISP_IT_EXECD |
1054                                     DISP_LOOKUP_EXECD |
1055                                     DISP_LOOKUP_NEG);
1056                 GOTO(out, rc = -ENOENT);
1057         }
1058
1059         mdt_set_disposition(info, rep, (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1060
1061         mdt_prep_ma_buf_from_rep(info, o, ma);
1062         if (flags & MDS_OPEN_RELEASE)
1063                 ma->ma_need |= MA_HSM;
1064         rc = mdt_attr_get_complex(info, o, ma);
1065         if (rc)
1066                 GOTO(out, rc);
1067
1068         /* We should not change file's existing LOV EA */
1069         if (S_ISREG(lu_object_attr(&o->mot_obj)) &&
1070             flags & MDS_OPEN_HAS_EA && ma->ma_valid & MA_LOV)
1071                 GOTO(out, rc = -EEXIST);
1072
1073         /* If a release request, check file flags are fine and ask for an
1074          * exclusive open access. */
1075         if (flags & MDS_OPEN_RELEASE && !mdt_hsm_release_allow(ma))
1076                 GOTO(out, rc = -EPERM);
1077
1078         rc = mdt_check_resent_lock(info, o, lhc);
1079         if (rc < 0) {
1080                 GOTO(out, rc);
1081         } else if (rc > 0) {
1082                 rc = mdt_object_open_lock(info, o, lhc, &ibits);
1083                 object_locked = true;
1084                 if (rc)
1085                         GOTO(out_unlock, rc);
1086         }
1087
1088         if (ma->ma_valid & MA_PFID) {
1089                 parent = mdt_object_find(env, mdt, &ma->ma_pfid);
1090                 if (IS_ERR(parent)) {
1091                         CDEBUG(D_INODE, "Fail to find parent "DFID
1092                                " for anonymous created %ld, try to"
1093                                " use system default.\n",
1094                                PFID(&ma->ma_pfid), PTR_ERR(parent));
1095                         parent = NULL;
1096                 }
1097         }
1098
1099         rc = mdt_finish_open(info, parent, o, flags, 0, rep);
1100         if (!rc) {
1101                 mdt_set_disposition(info, rep, DISP_LOOKUP_POS);
1102                 if (flags & MDS_OPEN_LOCK)
1103                         mdt_set_disposition(info, rep, DISP_OPEN_LOCK);
1104                 if (flags & MDS_OPEN_LEASE)
1105                         mdt_set_disposition(info, rep, DISP_OPEN_LEASE);
1106         }
1107         GOTO(out_unlock, rc);
1108
1109 out_unlock:
1110         if (object_locked)
1111                 mdt_object_open_unlock(info, o, lhc, ibits, rc);
1112 out:
1113         mdt_object_put(env, o);
1114 out_parent_put:
1115         if (parent != NULL)
1116                 mdt_object_put(env, parent);
1117         return rc;
1118 }
1119
1120 /* Cross-ref request. Currently it can only be a pure open (w/o create) */
1121 static int mdt_cross_open(struct mdt_thread_info *info,
1122                           const struct lu_fid *parent_fid,
1123                           const struct lu_fid *fid,
1124                           struct ldlm_reply *rep, __u32 flags)
1125 {
1126         struct md_attr    *ma = &info->mti_attr;
1127         struct mdt_object *o;
1128         int                rc;
1129         ENTRY;
1130
1131         o = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1132         if (IS_ERR(o))
1133                 RETURN(rc = PTR_ERR(o));
1134
1135         if (mdt_object_remote(o)) {
1136                 /* Something is wrong here, the object is on another MDS! */
1137                 CERROR("%s: "DFID" isn't on this server!: rc = %d\n",
1138                        mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1139                 LU_OBJECT_DEBUG(D_WARNING, info->mti_env,
1140                                 &o->mot_obj,
1141                                 "Object isn't on this server! FLD error?");
1142                 rc = -EFAULT;
1143         } else {
1144                 if (mdt_object_exists(o)) {
1145                         /* Do permission check for cross-open. */
1146                         rc = mo_permission(info->mti_env, NULL,
1147                                            mdt_object_child(o),
1148                                            NULL, flags | MDS_OPEN_CROSS);
1149                         if (rc)
1150                                 goto out;
1151
1152                         mdt_prep_ma_buf_from_rep(info, o, ma);
1153                         rc = mdt_attr_get_complex(info, o, ma);
1154                         if (rc != 0)
1155                                 GOTO(out, rc);
1156
1157                         rc = mdt_finish_open(info, NULL, o, flags, 0, rep);
1158                 } else {
1159                         /*
1160                          * Something is wrong here. lookup was positive but
1161                          * there is no object!
1162                          */
1163                         CERROR("%s: "DFID" doesn't exist!: rc = %d\n",
1164                               mdt_obd_name(info->mti_mdt), PFID(fid), -EFAULT);
1165                         rc = -EFAULT;
1166                 }
1167         }
1168 out:
1169         mdt_object_put(info->mti_env, o);
1170         RETURN(rc);
1171 }
1172
1173 /*
1174  * find root object and take its xattr lock if it's on remote MDT, later create
1175  * may use fs default striping (which is stored in root xattr).
1176  */
1177 static int mdt_lock_root_xattr(struct mdt_thread_info *info,
1178                                struct mdt_device *mdt)
1179 {
1180         struct mdt_object *md_root = mdt->mdt_md_root;
1181         struct lustre_handle lhroot;
1182         int rc;
1183
1184         if (md_root == NULL) {
1185                 lu_root_fid(&info->mti_tmp_fid1);
1186                 md_root = mdt_object_find(info->mti_env, mdt,
1187                                           &info->mti_tmp_fid1);
1188                 if (IS_ERR(md_root))
1189                         return PTR_ERR(md_root);
1190
1191                 spin_lock(&mdt->mdt_lock);
1192                 if (mdt->mdt_md_root != NULL) {
1193                         spin_unlock(&mdt->mdt_lock);
1194
1195                         LASSERTF(mdt->mdt_md_root == md_root,
1196                                  "Different root object ("
1197                                  DFID") instances, %p, %p\n",
1198                                  PFID(&info->mti_tmp_fid1),
1199                                  mdt->mdt_md_root, md_root);
1200                         LASSERT(atomic_read(
1201                                 &md_root->mot_obj.lo_header->loh_ref) > 1);
1202
1203                         mdt_object_put(info->mti_env, md_root);
1204                 } else {
1205                         mdt->mdt_md_root = md_root;
1206                         spin_unlock(&mdt->mdt_lock);
1207                 }
1208         }
1209
1210         if (md_root->mot_cache_attr || !mdt_object_remote(md_root))
1211                 return 0;
1212
1213         rc = mdt_remote_object_lock(info, md_root, mdt_object_fid(md_root),
1214                                     &lhroot, LCK_PR, MDS_INODELOCK_XATTR,
1215                                     true);
1216         if (rc < 0)
1217                 return rc;
1218
1219         md_root->mot_cache_attr = 1;
1220
1221         /* don't cancel this lock, so that we know the cached xattr is valid. */
1222         ldlm_lock_decref(&lhroot, LCK_PR);
1223
1224         return 0;
1225 }
1226
1227 int mdt_reint_open(struct mdt_thread_info *info, struct mdt_lock_handle *lhc)
1228 {
1229         struct mdt_device       *mdt = info->mti_mdt;
1230         struct ptlrpc_request   *req = mdt_info_req(info);
1231         struct mdt_object       *parent;
1232         struct mdt_object       *child;
1233         struct mdt_lock_handle  *lh;
1234         struct ldlm_reply       *ldlm_rep;
1235         struct mdt_body         *repbody;
1236         struct lu_fid           *child_fid = &info->mti_tmp_fid1;
1237         struct md_attr          *ma = &info->mti_attr;
1238         __u64                    create_flags = info->mti_spec.sp_cr_flags;
1239         __u64                    ibits = 0;
1240         struct mdt_reint_record *rr = &info->mti_rr;
1241         int                      result, rc;
1242         int                      created = 0;
1243         int                      object_locked = 0;
1244         __u32                    msg_flags;
1245         ENTRY;
1246
1247         OBD_FAIL_TIMEOUT_ORSET(OBD_FAIL_MDS_PAUSE_OPEN, OBD_FAIL_ONCE,
1248                                (obd_timeout + 1) / 4);
1249
1250         mdt_counter_incr(req, LPROC_MDT_OPEN);
1251         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1252
1253         ma->ma_need = MA_INODE;
1254         ma->ma_valid = 0;
1255
1256         LASSERT(info->mti_pill->rc_fmt == &RQF_LDLM_INTENT_OPEN);
1257         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
1258
1259         if (unlikely(create_flags & MDS_OPEN_JOIN_FILE)) {
1260                 CERROR("file join is not supported anymore.\n");
1261                 GOTO(out, result = err_serious(-EOPNOTSUPP));
1262         }
1263         msg_flags = lustre_msg_get_flags(req->rq_reqmsg);
1264
1265         if ((create_flags & (MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS)) &&
1266             info->mti_spec.u.sp_ea.eadata == NULL)
1267                 GOTO(out, result = err_serious(-EINVAL));
1268
1269         if (create_flags & FMODE_WRITE &&
1270             exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
1271                 GOTO(out, result = -EROFS);
1272
1273         CDEBUG(D_INODE, "I am going to open "DFID"/("DNAME"->"DFID") "
1274                "cr_flag=%#llo mode=0%06o msg_flag=0x%x\n",
1275                PFID(rr->rr_fid1), PNAME(&rr->rr_name),
1276                PFID(rr->rr_fid2), create_flags,
1277                ma->ma_attr.la_mode, msg_flags);
1278
1279         if (info->mti_cross_ref) {
1280                 /* This is cross-ref open */
1281                 mdt_set_disposition(info, ldlm_rep,
1282                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD |
1283                              DISP_LOOKUP_POS));
1284                 result = mdt_cross_open(info, rr->rr_fid2, rr->rr_fid1,
1285                                         ldlm_rep, create_flags);
1286                 GOTO(out, result);
1287         } else if (req_is_replay(req)) {
1288                 result = mdt_open_by_fid(info, ldlm_rep);
1289
1290                 if (result != -ENOENT)
1291                         GOTO(out, result);
1292
1293                 /* We didn't find the correct object, so we need to re-create it
1294                  * via a regular replay. */
1295                 if (!(create_flags & MDS_OPEN_CREAT)) {
1296                         DEBUG_REQ(D_ERROR, req,
1297                                   "OPEN & CREAT not in open replay/by_fid.");
1298                         GOTO(out, result = -EFAULT);
1299                 }
1300                 CDEBUG(D_INFO, "No object(1), continue as regular open.\n");
1301         } else if (create_flags & (MDS_OPEN_BY_FID | MDS_OPEN_LOCK)) {
1302                 /*
1303                  * MDS_OPEN_LOCK is checked for backward compatibility with 2.1
1304                  * client.
1305                  */
1306                 result = mdt_open_by_fid_lock(info, ldlm_rep, lhc);
1307                 if (result < 0)
1308                         CDEBUG(D_INFO, "no object for "DFID": %d\n",
1309                                PFID(rr->rr_fid2), result);
1310                 GOTO(out, result);
1311         }
1312
1313         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK))
1314                 GOTO(out, result = err_serious(-ENOMEM));
1315
1316         mdt_set_disposition(info, ldlm_rep,
1317                             (DISP_IT_EXECD | DISP_LOOKUP_EXECD));
1318
1319         if (!lu_name_is_valid(&rr->rr_name))
1320                 GOTO(out, result = -EPROTO);
1321
1322         result = mdt_lock_root_xattr(info, mdt);
1323         if (result < 0)
1324                 GOTO(out, result);
1325
1326 again:
1327         lh = &info->mti_lh[MDT_LH_PARENT];
1328         mdt_lock_pdo_init(lh,
1329                           (create_flags & MDS_OPEN_CREAT) ? LCK_PW : LCK_PR,
1330                           &rr->rr_name);
1331
1332         parent = mdt_object_find(info->mti_env, mdt, rr->rr_fid1);
1333         if (IS_ERR(parent))
1334                 GOTO(out, result = PTR_ERR(parent));
1335
1336         result = mdt_object_lock(info, parent, lh, MDS_INODELOCK_UPDATE);
1337         if (result != 0) {
1338                 mdt_object_put(info->mti_env, parent);
1339                 GOTO(out, result);
1340         }
1341
1342         /* get and check version of parent */
1343         result = mdt_version_get_check(info, parent, 0);
1344         if (result)
1345                 GOTO(out_parent, result);
1346
1347         fid_zero(child_fid);
1348
1349         result = mdo_lookup(info->mti_env, mdt_object_child(parent),
1350                             &rr->rr_name, child_fid, &info->mti_spec);
1351
1352         LASSERTF(ergo(result == 0, fid_is_sane(child_fid)),
1353                  "looking for "DFID"/"DNAME", found FID = "DFID"\n",
1354                  PFID(mdt_object_fid(parent)), PNAME(&rr->rr_name),
1355                  PFID(child_fid));
1356
1357         if (result != 0 && result != -ENOENT && result != -ESTALE)
1358                 GOTO(out_parent, result);
1359
1360         if (result == -ENOENT || result == -ESTALE) {
1361                 /* If the object is dead, let's check if the object
1362                  * is being migrated to a new object */
1363                 if (result == -ESTALE) {
1364                         struct lu_buf lmv_buf;
1365
1366                         lmv_buf.lb_buf = info->mti_xattr_buf;
1367                         lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
1368                         rc = mo_xattr_get(info->mti_env,
1369                                           mdt_object_child(parent),
1370                                           &lmv_buf, XATTR_NAME_LMV);
1371                         if (rc > 0) {
1372                                 struct lmv_mds_md_v1 *lmv;
1373
1374                                 lmv = lmv_buf.lb_buf;
1375                                 if (le32_to_cpu(lmv->lmv_hash_type) &
1376                                                 LMV_HASH_FLAG_MIGRATION) {
1377                                         /* Get the new parent FID and retry */
1378                                         mdt_object_unlock_put(info, parent,
1379                                                               lh, 1);
1380                                         mdt_lock_handle_init(lh);
1381                                         fid_le_to_cpu(
1382                                                 (struct lu_fid *)rr->rr_fid1,
1383                                                 &lmv->lmv_stripe_fids[1]);
1384                                         goto again;
1385                                 }
1386                         }
1387                 }
1388
1389                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1390                 if (result == -ESTALE) {
1391                         /*
1392                          * -ESTALE means the parent is a dead(unlinked) dir, so
1393                          * it should return -ENOENT to in accordance with the
1394                          * original mds implementaion.
1395                          */
1396                         GOTO(out_parent, result = -ENOENT);
1397                 }
1398
1399                 if (!(create_flags & MDS_OPEN_CREAT))
1400                         GOTO(out_parent, result);
1401                 if (mdt_rdonly(req->rq_export))
1402                         GOTO(out_parent, result = -EROFS);
1403                 *child_fid = *info->mti_rr.rr_fid2;
1404                 LASSERTF(fid_is_sane(child_fid), "fid="DFID"\n",
1405                          PFID(child_fid));
1406                 /* In the function below, .hs_keycmp resolves to
1407                  * lu_obj_hop_keycmp() */
1408                 /* coverity[overrun-buffer-val] */
1409                 child = mdt_object_new(info->mti_env, mdt, child_fid);
1410         } else {
1411                 /*
1412                  * Check for O_EXCL is moved to the mdt_finish_open(), we need to
1413                  * return FID back in that case.
1414                  */
1415                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1416                 child = mdt_object_find(info->mti_env, mdt, child_fid);
1417         }
1418         if (IS_ERR(child))
1419                 GOTO(out_parent, result = PTR_ERR(child));
1420
1421         /** check version of child  */
1422         rc = mdt_version_get_check(info, child, 1);
1423         if (rc)
1424                 GOTO(out_child, result = rc);
1425
1426         if (result == -ENOENT) {
1427                 /* Create under OBF and .lustre is not permitted */
1428                 if (!fid_is_md_operative(rr->rr_fid1))
1429                         GOTO(out_child, result = -EPERM);
1430
1431                 /* save versions in reply */
1432                 mdt_version_get_save(info, parent, 0);
1433                 mdt_version_get_save(info, child, 1);
1434
1435                 /* version of child will be changed */
1436                 tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(child));
1437
1438                 /* Not found and with MDS_OPEN_CREAT: let's create it. */
1439                 mdt_set_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1440
1441                 /* Let lower layers know what is lock mode on directory. */
1442                 info->mti_spec.sp_cr_mode =
1443                         mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
1444
1445                 /* Don't do lookup sanity check. We know name doesn't exist. */
1446                 info->mti_spec.sp_cr_lookup = 0;
1447                 info->mti_spec.sp_feat = &dt_directory_features;
1448
1449                 result = mdo_create(info->mti_env, mdt_object_child(parent),
1450                                     &rr->rr_name, mdt_object_child(child),
1451                                     &info->mti_spec, &info->mti_attr);
1452                 if (result == -ERESTART) {
1453                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1454                         GOTO(out_child, result);
1455                 } else {
1456                         mdt_prep_ma_buf_from_rep(info, child, ma);
1457                         /* XXX: we should call this once, see few lines below */
1458                         if (result == 0)
1459                                 result = mdt_attr_get_complex(info, child, ma);
1460
1461                         if (result != 0)
1462                                 GOTO(out_child, result);
1463                 }
1464                 created = 1;
1465                 mdt_counter_incr(req, LPROC_MDT_MKNOD);
1466         } else {
1467                 /*
1468                  * The object is on remote node, return its FID for remote open.
1469                  */
1470                 if (mdt_object_remote(child)) {
1471                         /*
1472                          * Check if this lock already was sent to client and
1473                          * this is resent case. For resent case do not take lock
1474                          * again, use what is already granted.
1475                          */
1476                         LASSERT(lhc != NULL);
1477
1478                         rc = mdt_check_resent_lock(info, child, lhc);
1479                         if (rc < 0) {
1480                                 GOTO(out_child, result = rc);
1481                         } else if (rc > 0) {
1482                                 mdt_lock_handle_init(lhc);
1483                                 mdt_lock_reg_init(lhc, LCK_PR);
1484
1485                                 rc = mdt_object_lock(info, child, lhc,
1486                                                      MDS_INODELOCK_LOOKUP);
1487                         }
1488                         repbody->mbo_fid1 = *mdt_object_fid(child);
1489                         repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
1490                         if (rc != 0)
1491                                 result = rc;
1492                         else
1493                                 result = -MDT_EREMOTE_OPEN;
1494                         GOTO(out_child, result);
1495                 } else if (mdt_object_exists(child)) {
1496                         /* We have to get attr & LOV EA & HSM for this
1497                          * object. */
1498                         mdt_prep_ma_buf_from_rep(info, child, ma);
1499                         ma->ma_need |= MA_HSM;
1500                         result = mdt_attr_get_complex(info, child, ma);
1501                         if (result != 0)
1502                                 GOTO(out_child, result);
1503                 } else {
1504                         /* Object does not exist. Likely FS corruption. */
1505                         CERROR("%s: name '"DNAME"' present, but FID "
1506                                DFID" is invalid\n", mdt_obd_name(info->mti_mdt),
1507                                PNAME(&rr->rr_name), PFID(child_fid));
1508                         GOTO(out_child, result = -EIO);
1509                 }
1510         }
1511
1512         rc = mdt_check_resent_lock(info, child, lhc);
1513         if (rc < 0) {
1514                 GOTO(out_child, result = rc);
1515         } else if (rc == 0) {
1516                 /* the open lock might already be gotten in
1517                  * ldlm_handle_enqueue() */
1518                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
1519                 if (create_flags & MDS_OPEN_LOCK)
1520                         mdt_set_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1521         } else {
1522                 /* get openlock if this isn't replay and client requested it */
1523                 if (!req_is_replay(req)) {
1524                         rc = mdt_object_open_lock(info, child, lhc, &ibits);
1525                         object_locked = 1;
1526                         if (rc != 0)
1527                                 GOTO(out_child_unlock, result = rc);
1528                         else if (create_flags & MDS_OPEN_LOCK)
1529                                 mdt_set_disposition(info, ldlm_rep,
1530                                                     DISP_OPEN_LOCK);
1531                 }
1532         }
1533         /* Try to open it now. */
1534         rc = mdt_finish_open(info, parent, child, create_flags,
1535                              created, ldlm_rep);
1536         if (rc) {
1537                 result = rc;
1538                 /* openlock will be released if mdt_finish_open failed */
1539                 mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_LOCK);
1540
1541                 if (created && create_flags & MDS_OPEN_VOLATILE) {
1542                         CERROR("%s: cannot open volatile file "DFID", orphan "
1543                                "file will be left in PENDING directory until "
1544                                "next reboot, rc = %d\n", mdt_obd_name(mdt),
1545                                PFID(mdt_object_fid(child)), rc);
1546                         GOTO(out_child_unlock, result);
1547                 }
1548
1549                 if (created) {
1550                         ma->ma_need = 0;
1551                         ma->ma_valid = 0;
1552                         rc = mdo_unlink(info->mti_env,
1553                                         mdt_object_child(parent),
1554                                         mdt_object_child(child),
1555                                         &rr->rr_name,
1556                                         &info->mti_attr, 0);
1557                         if (rc != 0)
1558                                 CERROR("%s: "DFID" cleanup of open: rc = %d\n",
1559                                        mdt_obd_name(info->mti_mdt),
1560                                        PFID(mdt_object_fid(child)), rc);
1561                         mdt_clear_disposition(info, ldlm_rep, DISP_OPEN_CREATE);
1562                 }
1563         }
1564         EXIT;
1565 out_child_unlock:
1566         if (object_locked)
1567                 mdt_object_open_unlock(info, child, lhc, ibits, result);
1568 out_child:
1569         mdt_object_put(info->mti_env, child);
1570 out_parent:
1571         mdt_object_unlock_put(info, parent, lh, result || !created);
1572 out:
1573         if (result)
1574                 lustre_msg_set_transno(req->rq_repmsg, 0);
1575         return result;
1576 }
1577
1578 /**
1579  * Create an orphan object use local root.
1580  */
1581 static struct mdt_object *mdt_orphan_open(struct mdt_thread_info *info,
1582                                           struct mdt_device *mdt,
1583                                           const struct lu_fid *fid,
1584                                           struct md_attr *attr, fmode_t fmode)
1585 {
1586         const struct lu_env *env = info->mti_env;
1587         struct md_op_spec *spec = &info->mti_spec;
1588         struct lu_fid *local_root_fid = &info->mti_tmp_fid1;
1589         struct mdt_object *obj = NULL;
1590         struct mdt_object *local_root;
1591         static const struct lu_name lname = {
1592                 .ln_name = "i_am_nobody",
1593                 .ln_namelen = sizeof("i_am_nobody") - 1,
1594         };
1595         struct lu_ucred *uc;
1596         cfs_cap_t uc_cap_save;
1597         int rc;
1598         ENTRY;
1599
1600         rc = dt_root_get(env, mdt->mdt_bottom, local_root_fid);
1601         if (rc != 0)
1602                 RETURN(ERR_PTR(rc));
1603
1604         local_root = mdt_object_find(env, mdt, local_root_fid);
1605         if (IS_ERR(local_root))
1606                 RETURN(local_root);
1607
1608         obj = mdt_object_new(env, mdt, fid);
1609         if (IS_ERR(obj))
1610                 GOTO(out, rc = PTR_ERR(obj));
1611
1612         spec->sp_cr_lookup = 0;
1613         spec->sp_feat = &dt_directory_features;
1614         spec->sp_cr_mode = MDL_MINMODE; /* no lock */
1615         spec->sp_cr_flags = MDS_OPEN_VOLATILE | fmode;
1616         if (attr->ma_valid & MA_LOV) {
1617                 spec->u.sp_ea.eadata = attr->ma_lmm;
1618                 spec->u.sp_ea.eadatalen = attr->ma_lmm_size;
1619                 spec->sp_cr_flags |= MDS_OPEN_HAS_EA;
1620         } else {
1621                 spec->sp_cr_flags |= MDS_OPEN_DELAY_CREATE;
1622         }
1623
1624         uc = lu_ucred(env);
1625         uc_cap_save = uc->uc_cap;
1626         uc->uc_cap |= 1 << CFS_CAP_DAC_OVERRIDE;
1627         rc = mdo_create(env, mdt_object_child(local_root), &lname,
1628                         mdt_object_child(obj), spec, attr);
1629         uc->uc_cap = uc_cap_save;
1630         if (rc < 0) {
1631                 CERROR("%s: cannot create volatile file "DFID": rc = %d\n",
1632                        mdt_obd_name(mdt), PFID(fid), rc);
1633                 GOTO(out, rc);
1634         }
1635
1636         rc = mo_open(env, mdt_object_child(obj), MDS_OPEN_CREATED);
1637         if (rc < 0)
1638                 CERROR("%s: cannot open volatile file "DFID", orphan "
1639                        "file will be left in PENDING directory until "
1640                        "next reboot, rc = %d\n", mdt_obd_name(mdt),
1641                        PFID(fid), rc);
1642         GOTO(out, rc);
1643
1644 out:
1645         if (rc < 0) {
1646                 if (!IS_ERR(obj))
1647                         mdt_object_put(env, obj);
1648                 obj = ERR_PTR(rc);
1649         }
1650         mdt_object_put(env, local_root);
1651         return obj;
1652 }
1653
1654 /* XXX Look into layout in MDT layer. */
1655 static inline int mdt_hsm_set_released(struct lov_mds_md *lmm)
1656 {
1657         struct lov_comp_md_v1   *comp_v1;
1658         struct lov_mds_md       *v1;
1659         __u32   off;
1660         int     i;
1661
1662         if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_COMP_V1_DEFINED)) {
1663                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1664
1665                 if (comp_v1->lcm_entry_count == 0)
1666                         return -EINVAL;
1667
1668                 for (i = 0; i < le16_to_cpu(comp_v1->lcm_entry_count); i++) {
1669                         off = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1670                         v1 = (struct lov_mds_md *)((char *)comp_v1 + off);
1671                         v1->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_RELEASED);
1672                 }
1673         } else {
1674                 lmm->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_RELEASED);
1675         }
1676         return 0;
1677 }
1678
1679 static int mdt_hsm_release(struct mdt_thread_info *info, struct mdt_object *o,
1680                            struct md_attr *ma)
1681 {
1682         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LAYOUT];
1683         struct lu_ucred        *uc = mdt_ucred(info);
1684         struct close_data      *data;
1685         struct ldlm_lock       *lease;
1686         struct mdt_object      *orphan;
1687         struct md_attr         *orp_ma;
1688         struct lu_buf          *buf;
1689         cfs_cap_t               cap;
1690         bool                    lease_broken;
1691         int                     rc;
1692         int                     rc2;
1693         ENTRY;
1694
1695         if (mdt_rdonly(info->mti_exp))
1696                 RETURN(-EROFS);
1697
1698         data = req_capsule_client_get(info->mti_pill, &RMF_CLOSE_DATA);
1699         if (data == NULL)
1700                 RETURN(-EPROTO);
1701
1702         lease = ldlm_handle2lock(&data->cd_handle);
1703         if (lease == NULL)
1704                 RETURN(-ESTALE);
1705
1706         /* try to hold open_sem so that nobody else can open the file */
1707         if (!down_write_trylock(&o->mot_open_sem)) {
1708                 ldlm_lock_cancel(lease);
1709                 GOTO(out_reprocess, rc = -EBUSY);
1710         }
1711
1712         /* Check if the lease open lease has already canceled */
1713         lock_res_and_lock(lease);
1714         lease_broken = ldlm_is_cancel(lease);
1715         unlock_res_and_lock(lease);
1716
1717         LDLM_DEBUG(lease, DFID " lease broken? %d",
1718                    PFID(mdt_object_fid(o)), lease_broken);
1719
1720         /* Cancel server side lease. Client side counterpart should
1721          * have been cancelled. It's okay to cancel it now as we've
1722          * held mot_open_sem. */
1723         ldlm_lock_cancel(lease);
1724
1725         if (lease_broken) /* don't perform release task */
1726                 GOTO(out_unlock, rc = -ESTALE);
1727
1728         if (fid_is_zero(&data->cd_fid) || !fid_is_sane(&data->cd_fid))
1729                 GOTO(out_unlock, rc = -EINVAL);
1730
1731         /* ma_need was set before but it seems fine to change it in order to
1732          * avoid modifying the one from RPC */
1733         ma->ma_need = MA_HSM;
1734         rc = mdt_attr_get_complex(info, o, ma);
1735         if (rc != 0)
1736                 GOTO(out_unlock, rc);
1737
1738         if (!mdt_hsm_release_allow(ma))
1739                 GOTO(out_unlock, rc = -EPERM);
1740
1741         /* already released? */
1742         if (ma->ma_hsm.mh_flags & HS_RELEASED)
1743                 GOTO(out_unlock, rc = 0);
1744
1745         /* Compare on-disk and packed data_version */
1746         if (data->cd_data_version != ma->ma_hsm.mh_arch_ver) {
1747                 CDEBUG(D_HSM, DFID" data_version mismatches: packed=%llu"
1748                        " and on-disk=%llu\n", PFID(mdt_object_fid(o)),
1749                        data->cd_data_version, ma->ma_hsm.mh_arch_ver);
1750                 GOTO(out_unlock, rc = -EPERM);
1751         }
1752
1753         ma->ma_valid = MA_INODE;
1754         ma->ma_attr.la_valid &= LA_ATIME | LA_MTIME | LA_CTIME | LA_SIZE;
1755         rc = mo_attr_set(info->mti_env, mdt_object_child(o), ma);
1756         if (rc < 0)
1757                 GOTO(out_unlock, rc);
1758
1759         ma->ma_need = MA_INODE | MA_LOV;
1760         rc = mdt_attr_get_complex(info, o, ma);
1761         if (rc < 0)
1762                 GOTO(out_unlock, rc);
1763
1764         if (!(ma->ma_valid & MA_LOV)) {
1765                 /* Even empty file are released */
1766                 memset(ma->ma_lmm, 0, sizeof(*ma->ma_lmm));
1767                 ma->ma_lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1_DEFINED);
1768                 ma->ma_lmm->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1769                 ma->ma_lmm->lmm_stripe_size = cpu_to_le32(LOV_MIN_STRIPE_SIZE);
1770                 ma->ma_lmm_size = sizeof(*ma->ma_lmm);
1771         } else {
1772                 /* Magic must be LOV_MAGIC_*_DEFINED or LOD will interpret
1773                  * ma_lmm as lov_user_md, then it will be confused by union of
1774                  * layout_gen and stripe_offset. */
1775                 if ((le32_to_cpu(ma->ma_lmm->lmm_magic) & LOV_MAGIC_MASK) ==
1776                     LOV_MAGIC_MAGIC)
1777                         ma->ma_lmm->lmm_magic |= cpu_to_le32(LOV_MAGIC_DEFINED);
1778                 else
1779                         GOTO(out_unlock, rc = -EINVAL);
1780         }
1781
1782         /* Set file as released. */
1783         rc = mdt_hsm_set_released(ma->ma_lmm);
1784         if (rc)
1785                 GOTO(out_unlock, rc);
1786
1787         orp_ma = &info->mti_u.hsm.attr;
1788         orp_ma->ma_attr.la_mode = S_IFREG | S_IWUSR;
1789         /* We use root ownership to bypass potential quota
1790          * restrictions on the user and group of the file. */
1791         orp_ma->ma_attr.la_uid = 0;
1792         orp_ma->ma_attr.la_gid = 0;
1793         orp_ma->ma_attr.la_valid = LA_MODE | LA_UID | LA_GID;
1794         orp_ma->ma_lmm = ma->ma_lmm;
1795         orp_ma->ma_lmm_size = ma->ma_lmm_size;
1796         orp_ma->ma_valid = MA_INODE | MA_LOV;
1797         orphan = mdt_orphan_open(info, info->mti_mdt, &data->cd_fid, orp_ma,
1798                                  FMODE_WRITE);
1799         if (IS_ERR(orphan)) {
1800                 CERROR("%s: cannot open orphan file "DFID": rc = %ld\n",
1801                        mdt_obd_name(info->mti_mdt), PFID(&data->cd_fid),
1802                        PTR_ERR(orphan));
1803                 GOTO(out_unlock, rc = PTR_ERR(orphan));
1804         }
1805
1806         /* Set up HSM attribute for orphan object */
1807         CLASSERT(sizeof(struct hsm_attrs) <= sizeof(info->mti_xattr_buf));
1808         buf = &info->mti_buf;
1809         buf->lb_buf = info->mti_xattr_buf;
1810         buf->lb_len = sizeof(struct hsm_attrs);
1811         ma->ma_hsm.mh_flags |= HS_RELEASED;
1812         lustre_hsm2buf(buf->lb_buf, &ma->ma_hsm);
1813         ma->ma_hsm.mh_flags &= ~HS_RELEASED;
1814
1815         mdt_lock_reg_init(lh, LCK_EX);
1816         rc = mdt_object_lock(info, o, lh, MDS_INODELOCK_LAYOUT |
1817                              MDS_INODELOCK_XATTR);
1818         if (rc != 0)
1819                 GOTO(out_close, rc);
1820
1821         /* The orphan has root ownership so we need to raise
1822          * CAP_FOWNER to set the HSM attributes. */
1823         cap = uc->uc_cap;
1824         uc->uc_cap |= MD_CAP_TO_MASK(CFS_CAP_FOWNER);
1825         rc = mo_xattr_set(info->mti_env, mdt_object_child(orphan), buf,
1826                           XATTR_NAME_HSM, 0);
1827         uc->uc_cap = cap;
1828         if (rc != 0)
1829                 GOTO(out_layout_lock, rc);
1830
1831         /* Swap layout with orphan objects. */
1832         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o),
1833                              mdt_object_child(orphan),
1834                              SWAP_LAYOUTS_MDS_HSM);
1835         EXIT;
1836
1837 out_layout_lock:
1838         /* Release exclusive LL */
1839         mdt_object_unlock(info, o, lh, 1);
1840 out_close:
1841         /* Close orphan object anyway */
1842         rc2 = mo_close(info->mti_env, mdt_object_child(orphan), orp_ma,
1843                        FMODE_WRITE);
1844         if (rc2 < 0)
1845                 CERROR("%s: error closing volatile file "DFID": rc = %d\n",
1846                        mdt_obd_name(info->mti_mdt), PFID(&data->cd_fid), rc2);
1847         LU_OBJECT_DEBUG(D_HSM, info->mti_env, &orphan->mot_obj,
1848                         "object closed");
1849         mdt_object_put(info->mti_env, orphan);
1850
1851 out_unlock:
1852         up_write(&o->mot_open_sem);
1853
1854         /* already released */
1855         if (rc == 0) {
1856                 struct mdt_body *repbody;
1857
1858                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1859                 LASSERT(repbody != NULL);
1860                 repbody->mbo_valid |= OBD_MD_CLOSE_INTENT_EXECED;
1861         }
1862
1863 out_reprocess:
1864         ldlm_reprocess_all(lease->l_resource);
1865         LDLM_LOCK_PUT(lease);
1866
1867         ma->ma_valid = 0;
1868         ma->ma_need = 0;
1869
1870         return rc;
1871 }
1872
1873 int mdt_close_swap_layouts(struct mdt_thread_info *info,
1874                            struct mdt_object *o, struct md_attr *ma)
1875 {
1876         struct mdt_lock_handle  *lh1 = &info->mti_lh[MDT_LH_NEW];
1877         struct mdt_lock_handle  *lh2 = &info->mti_lh[MDT_LH_OLD];
1878         struct close_data       *data;
1879         struct ldlm_lock        *lease;
1880         struct mdt_object       *o1 = o, *o2;
1881         bool                     lease_broken;
1882         bool                     swap_objects;
1883         int                      rc;
1884         ENTRY;
1885
1886         if (exp_connect_flags(info->mti_exp) & OBD_CONNECT_RDONLY)
1887                 RETURN(-EROFS);
1888
1889         if (!S_ISREG(lu_object_attr(&o1->mot_obj)))
1890                 RETURN(-EINVAL);
1891
1892         data = req_capsule_client_get(info->mti_pill, &RMF_CLOSE_DATA);
1893         if (data == NULL)
1894                 RETURN(-EPROTO);
1895
1896         if (fid_is_zero(&data->cd_fid) || !fid_is_sane(&data->cd_fid))
1897                 RETURN(-EINVAL);
1898
1899         rc = lu_fid_cmp(&data->cd_fid, mdt_object_fid(o));
1900         if (unlikely(rc == 0))
1901                 RETURN(-EINVAL);
1902
1903         /* Exchange o1 and o2, to enforce locking order */
1904         swap_objects = (rc < 0);
1905
1906         lease = ldlm_handle2lock(&data->cd_handle);
1907         if (lease == NULL)
1908                 RETURN(-ESTALE);
1909
1910         o2 = mdt_object_find(info->mti_env, info->mti_mdt, &data->cd_fid);
1911         if (IS_ERR(o2))
1912                 GOTO(out_lease, rc = PTR_ERR(o2));
1913
1914         if (!S_ISREG(lu_object_attr(&o2->mot_obj))) {
1915                 swap_objects = false; /* not swapped yet */
1916                 GOTO(out_obj, rc = -EINVAL);
1917         }
1918
1919         if (swap_objects)
1920                 swap(o1, o2);
1921
1922         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1923                            MAY_WRITE);
1924         if (rc < 0)
1925                 GOTO(out_obj, rc);
1926
1927         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1928                            MAY_WRITE);
1929         if (rc < 0)
1930                 GOTO(out_obj, rc);
1931
1932         /* try to hold open_sem so that nobody else can open the file */
1933         if (!down_write_trylock(&o->mot_open_sem)) {
1934                 ldlm_lock_cancel(lease);
1935                 GOTO(out_obj, rc = -EBUSY);
1936         }
1937
1938         /* Check if the lease open lease has already canceled */
1939         lock_res_and_lock(lease);
1940         lease_broken = ldlm_is_cancel(lease);
1941         unlock_res_and_lock(lease);
1942
1943         LDLM_DEBUG(lease, DFID " lease broken? %d",
1944                    PFID(mdt_object_fid(o)), lease_broken);
1945
1946         /* Cancel server side lease. Client side counterpart should
1947          * have been cancelled. It's okay to cancel it now as we've
1948          * held mot_open_sem. */
1949         ldlm_lock_cancel(lease);
1950
1951         if (lease_broken)
1952                 GOTO(out_unlock_sem, rc = -ESTALE);
1953
1954         mdt_lock_reg_init(lh1, LCK_EX);
1955         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1956                              MDS_INODELOCK_XATTR);
1957         if (rc < 0)
1958                 GOTO(out_unlock_sem, rc);
1959
1960         mdt_lock_reg_init(lh2, LCK_EX);
1961         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1962                              MDS_INODELOCK_XATTR);
1963         if (rc < 0)
1964                 GOTO(out_unlock1, rc);
1965
1966         /* Swap layout with orphan object */
1967         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1968                              mdt_object_child(o2), 0);
1969         if (rc < 0)
1970                 GOTO(out_unlock2, rc);
1971
1972         EXIT;
1973
1974 out_unlock2:
1975         /* Release exclusive LL */
1976         mdt_object_unlock(info, o2, lh2, 1);
1977
1978 out_unlock1:
1979         mdt_object_unlock(info, o1, lh1, 1);
1980
1981 out_unlock_sem:
1982         up_write(&o->mot_open_sem);
1983
1984         /* already swapped */
1985         if (rc == 0) {
1986                 struct mdt_body *repbody;
1987
1988                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1989                 LASSERT(repbody != NULL);
1990                 repbody->mbo_valid |= OBD_MD_CLOSE_INTENT_EXECED;
1991         }
1992
1993 out_obj:
1994         mdt_object_put(info->mti_env, swap_objects ? o1 : o2);
1995
1996         ldlm_reprocess_all(lease->l_resource);
1997
1998 out_lease:
1999         LDLM_LOCK_PUT(lease);
2000
2001         if (ma != NULL) {
2002                 ma->ma_valid = 0;
2003                 ma->ma_need = 0;
2004         }
2005
2006         return rc;
2007 }
2008
2009 #define MFD_CLOSED(mode) ((mode) == MDS_FMODE_CLOSED)
2010 static int mdt_mfd_closed(struct mdt_file_data *mfd)
2011 {
2012         return ((mfd == NULL) || MFD_CLOSED(mfd->mfd_mode));
2013 }
2014
2015 int mdt_mfd_close(struct mdt_thread_info *info, struct mdt_file_data *mfd)
2016 {
2017         struct mdt_object *o = mfd->mfd_object;
2018         struct md_object *next = mdt_object_child(o);
2019         struct md_attr *ma = &info->mti_attr;
2020         int rc = 0;
2021         __u64 mode;
2022         ENTRY;
2023
2024         mode = mfd->mfd_mode;
2025
2026         if (ma->ma_attr_flags & MDS_HSM_RELEASE) {
2027                 rc = mdt_hsm_release(info, o, ma);
2028                 if (rc < 0) {
2029                         CDEBUG(D_HSM, "%s: File " DFID " release failed: %d\n",
2030                                mdt_obd_name(info->mti_mdt),
2031                                PFID(mdt_object_fid(o)), rc);
2032                         /* continue to close even error occurred. */
2033                 }
2034         }
2035
2036         if (ma->ma_attr_flags & MDS_CLOSE_LAYOUT_SWAP) {
2037                 rc = mdt_close_swap_layouts(info, o, ma);
2038                 if (rc < 0) {
2039                         CDEBUG(D_INODE,
2040                                "%s: cannot swap layout of "DFID": rc=%d\n",
2041                                mdt_obd_name(info->mti_mdt),
2042                                PFID(mdt_object_fid(o)), rc);
2043                         /* continue to close even if error occurred. */
2044                 }
2045         }
2046
2047         if (mode & FMODE_WRITE)
2048                 mdt_write_put(o);
2049         else if (mode & MDS_FMODE_EXEC)
2050                 mdt_write_allow(o);
2051
2052         /* Update atime on close only. */
2053         if ((mode & MDS_FMODE_EXEC || mode & FMODE_READ || mode & FMODE_WRITE)
2054             && (ma->ma_valid & MA_INODE) && (ma->ma_attr.la_valid & LA_ATIME)) {
2055                 /* Set the atime only. */
2056                 ma->ma_valid = MA_INODE;
2057                 ma->ma_attr.la_valid = LA_ATIME;
2058                 rc = mo_attr_set(info->mti_env, next, ma);
2059         }
2060
2061         /* If file data is modified, add the dirty flag. */
2062         if (ma->ma_attr_flags & MDS_DATA_MODIFIED)
2063                 rc = mdt_add_dirty_flag(info, o, ma);
2064
2065         ma->ma_need |= MA_INODE;
2066         ma->ma_valid &= ~MA_INODE;
2067
2068         LASSERT(atomic_read(&o->mot_open_count) > 0);
2069         atomic_dec(&o->mot_open_count);
2070         mdt_handle_last_unlink(info, o, ma);
2071
2072         if (!MFD_CLOSED(mode))
2073                 rc = mo_close(info->mti_env, next, ma, mode);
2074
2075         /* adjust open and lease count */
2076         if (mode & MDS_OPEN_LEASE) {
2077                 LASSERT(atomic_read(&o->mot_lease_count) > 0);
2078                 atomic_dec(&o->mot_lease_count);
2079         }
2080
2081         mdt_mfd_free(mfd);
2082         mdt_object_put(info->mti_env, o);
2083
2084         RETURN(rc);
2085 }
2086
2087 int mdt_close_internal(struct mdt_thread_info *info, struct ptlrpc_request *req,
2088                        struct mdt_body *repbody)
2089 {
2090         struct mdt_export_data *med;
2091         struct mdt_file_data   *mfd;
2092         int                     ret = 0;
2093         int                     rc = 0;
2094         ENTRY;
2095
2096         med = &req->rq_export->exp_mdt_data;
2097         spin_lock(&med->med_open_lock);
2098         mfd = mdt_handle2mfd(med, &info->mti_close_handle, req_is_replay(req));
2099         if (mdt_mfd_closed(mfd)) {
2100                 spin_unlock(&med->med_open_lock);
2101                 CDEBUG(D_INODE, "no handle for file close: fid = "DFID
2102                        ": cookie = %#llx\n", PFID(info->mti_rr.rr_fid1),
2103                        info->mti_close_handle.cookie);
2104                 /** not serious error since bug 3633 */
2105                 rc = -ESTALE;
2106         } else {
2107                 class_handle_unhash(&mfd->mfd_handle);
2108                 list_del_init(&mfd->mfd_list);
2109                 spin_unlock(&med->med_open_lock);
2110                 ret = mdt_mfd_close(info, mfd);
2111         }
2112
2113         RETURN(rc ? rc : ret);
2114 }
2115
2116 int mdt_close(struct tgt_session_info *tsi)
2117 {
2118         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
2119         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2120         struct md_attr         *ma = &info->mti_attr;
2121         struct mdt_body        *repbody = NULL;
2122         int rc, ret = 0;
2123         ENTRY;
2124
2125         mdt_counter_incr(req, LPROC_MDT_CLOSE);
2126         /* Close may come with the Size-on-MDS update. Unpack it. */
2127         rc = mdt_close_unpack(info);
2128         if (rc)
2129                 GOTO(out, rc = err_serious(rc));
2130
2131         /* These fields are no longer used and are left for compatibility.
2132          * size is always zero */
2133         req_capsule_set_size(info->mti_pill, &RMF_MDT_MD, RCL_SERVER,
2134                              0);
2135         req_capsule_set_size(info->mti_pill, &RMF_LOGCOOKIES, RCL_SERVER,
2136                              0);
2137         rc = req_capsule_server_pack(info->mti_pill);
2138         if (mdt_check_resent(info, mdt_reconstruct_generic, NULL)) {
2139                 mdt_client_compatibility(info);
2140                 if (rc == 0)
2141                         mdt_fix_reply(info);
2142                 mdt_exit_ucred(info);
2143                 GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
2144         }
2145
2146         /* Continue to close handle even if we can not pack reply */
2147         if (rc == 0) {
2148                 repbody = req_capsule_server_get(info->mti_pill,
2149                                                  &RMF_MDT_BODY);
2150                 ma->ma_lmm = req_capsule_server_get(info->mti_pill,
2151                                                     &RMF_MDT_MD);
2152                 ma->ma_lmm_size = req_capsule_get_size(info->mti_pill,
2153                                                        &RMF_MDT_MD,
2154                                                        RCL_SERVER);
2155                 ma->ma_need = MA_INODE | MA_LOV;
2156                 repbody->mbo_eadatasize = 0;
2157                 repbody->mbo_aclsize = 0;
2158         } else {
2159                 rc = err_serious(rc);
2160         }
2161
2162         rc = mdt_close_internal(info, req, repbody);
2163         if (rc != -ESTALE)
2164                 mdt_empty_transno(info, rc);
2165
2166         if (repbody != NULL) {
2167                 mdt_client_compatibility(info);
2168                 rc = mdt_fix_reply(info);
2169         }
2170
2171         mdt_exit_ucred(info);
2172         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK))
2173                 GOTO(out, rc = err_serious(-ENOMEM));
2174
2175         if (OBD_FAIL_CHECK_RESET(OBD_FAIL_MDS_CLOSE_NET_REP,
2176                                  OBD_FAIL_MDS_CLOSE_NET_REP))
2177                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_CLOSE_NET_REP;
2178 out:
2179         mdt_thread_info_fini(info);
2180         RETURN(rc ? rc : ret);
2181 }