lustre/mdt/mdt_reint.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, 2017, 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_reint.c
  33  *
  34  * Lustre Metadata Target (mdt) reintegration routines
  35  *
  36  * Author: Peter Braam <braam@clusterfs.com>
  37  * Author: Andreas Dilger <adilger@clusterfs.com>
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  * Author: Huang Hua <huanghua@clusterfs.com>
  40  * Author: Yury Umanets <umka@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_MDS
  44
  45 #include <lprocfs_status.h>
  46 #include "mdt_internal.h"
  47 #include <lustre_lmv.h>
  48
  49 static inline void mdt_reint_init_ma(struct mdt_thread_info *info,
  50                                      struct md_attr *ma)
  51 {
  52         ma->ma_need = MA_INODE;
  53         ma->ma_valid = 0;
  54 }
  55
  56 /**
  57  * Get version of object by fid.
  58  *
  59  * Return real version or ENOENT_VERSION if object doesn't exist
  60  */
  61 static void mdt_obj_version_get(struct mdt_thread_info *info,
  62                                 struct mdt_object *o, __u64 *version)
  63 {
  64         LASSERT(o);
  65
  66         if (mdt_object_exists(o) && !mdt_object_remote(o) &&
  67             !fid_is_obf(mdt_object_fid(o)))
  68                 *version = dt_version_get(info->mti_env, mdt_obj2dt(o));
  69         else
  70                 *version = ENOENT_VERSION;
  71         CDEBUG(D_INODE, "FID "DFID" version is %#llx\n",
  72                PFID(mdt_object_fid(o)), *version);
  73 }
  74
  75 /**
  76  * Check version is correct.
  77  *
  78  * Should be called only during replay.
  79  */
  80 static int mdt_version_check(struct ptlrpc_request *req,
  81                              __u64 version, int idx)
  82 {
  83         __u64 *pre_ver = lustre_msg_get_versions(req->rq_reqmsg);
  84         ENTRY;
  85
  86         if (!exp_connect_vbr(req->rq_export))
  87                 RETURN(0);
  88
  89         LASSERT(req_is_replay(req));
  90         /** VBR: version is checked always because costs nothing */
  91         LASSERT(idx < PTLRPC_NUM_VERSIONS);
  92         /** Sanity check for malformed buffers */
  93         if (pre_ver == NULL) {
  94                 CERROR("No versions in request buffer\n");
  95                 spin_lock(&req->rq_export->exp_lock);
  96                 req->rq_export->exp_vbr_failed = 1;
  97                 spin_unlock(&req->rq_export->exp_lock);
  98                 RETURN(-EOVERFLOW);
  99         } else if (pre_ver[idx] != version) {
 100                 CDEBUG(D_INODE, "Version mismatch %#llx != %#llx\n",
 101                        pre_ver[idx], version);
 102                 spin_lock(&req->rq_export->exp_lock);
 103                 req->rq_export->exp_vbr_failed = 1;
 104                 spin_unlock(&req->rq_export->exp_lock);
 105                 RETURN(-EOVERFLOW);
 106         }
 107         RETURN(0);
 108 }
 109
 110 /**
 111  * Save pre-versions in reply.
 112  */
 113 static void mdt_version_save(struct ptlrpc_request *req, __u64 version,
 114                              int idx)
 115 {
 116         __u64 *reply_ver;
 117
 118         if (!exp_connect_vbr(req->rq_export))
 119                 return;
 120
 121         LASSERT(!req_is_replay(req));
 122         LASSERT(req->rq_repmsg != NULL);
 123         reply_ver = lustre_msg_get_versions(req->rq_repmsg);
 124         if (reply_ver)
 125                 reply_ver[idx] = version;
 126 }
 127
 128 /**
 129  * Save enoent version, it is needed when it is obvious that object doesn't
 130  * exist, e.g. child during create.
 131  */
 132 static void mdt_enoent_version_save(struct mdt_thread_info *info, int idx)
 133 {
 134         /* save version of file name for replay, it must be ENOENT here */
 135         if (!req_is_replay(mdt_info_req(info))) {
 136                 info->mti_ver[idx] = ENOENT_VERSION;
 137                 mdt_version_save(mdt_info_req(info), info->mti_ver[idx], idx);
 138         }
 139 }
 140
 141 /**
 142  * Get version from disk and save in reply buffer.
 143  *
 144  * Versions are saved in reply only during normal operations not replays.
 145  */
 146 void mdt_version_get_save(struct mdt_thread_info *info,
 147                           struct mdt_object *mto, int idx)
 148 {
 149         /* don't save versions during replay */
 150         if (!req_is_replay(mdt_info_req(info))) {
 151                 mdt_obj_version_get(info, mto, &info->mti_ver[idx]);
 152                 mdt_version_save(mdt_info_req(info), info->mti_ver[idx], idx);
 153         }
 154 }
 155
 156 /**
 157  * Get version from disk and check it, no save in reply.
 158  */
 159 int mdt_version_get_check(struct mdt_thread_info *info,
 160                           struct mdt_object *mto, int idx)
 161 {
 162         /* only check versions during replay */
 163         if (!req_is_replay(mdt_info_req(info)))
 164                 return 0;
 165
 166         mdt_obj_version_get(info, mto, &info->mti_ver[idx]);
 167         return mdt_version_check(mdt_info_req(info), info->mti_ver[idx], idx);
 168 }
 169
 170 /**
 171  * Get version from disk and check if recovery or just save.
 172  */
 173 int mdt_version_get_check_save(struct mdt_thread_info *info,
 174                                struct mdt_object *mto, int idx)
 175 {
 176         int rc = 0;
 177
 178         mdt_obj_version_get(info, mto, &info->mti_ver[idx]);
 179         if (req_is_replay(mdt_info_req(info)))
 180                 rc = mdt_version_check(mdt_info_req(info), info->mti_ver[idx],
 181                                        idx);
 182         else
 183                 mdt_version_save(mdt_info_req(info), info->mti_ver[idx], idx);
 184         return rc;
 185 }
 186
 187 /**
 188  * Lookup with version checking.
 189  *
 190  * This checks version of 'name'. Many reint functions uses 'name' for child not
 191  * FID, therefore we need to get object by name and check its version.
 192  */
 193 static int mdt_lookup_version_check(struct mdt_thread_info *info,
 194                                     struct mdt_object *p,
 195                                     const struct lu_name *lname,
 196                                     struct lu_fid *fid, int idx)
 197 {
 198         int rc, vbrc;
 199
 200         rc = mdo_lookup(info->mti_env, mdt_object_child(p), lname, fid,
 201                         &info->mti_spec);
 202         /* Check version only during replay */
 203         if (!req_is_replay(mdt_info_req(info)))
 204                 return rc;
 205
 206         info->mti_ver[idx] = ENOENT_VERSION;
 207         if (rc == 0) {
 208                 struct mdt_object *child;
 209                 child = mdt_object_find(info->mti_env, info->mti_mdt, fid);
 210                 if (likely(!IS_ERR(child))) {
 211                         mdt_obj_version_get(info, child, &info->mti_ver[idx]);
 212                         mdt_object_put(info->mti_env, child);
 213                 }
 214         }
 215         vbrc = mdt_version_check(mdt_info_req(info), info->mti_ver[idx], idx);
 216         return vbrc ? vbrc : rc;
 217
 218 }
 219
 220 static int mdt_unlock_slaves(struct mdt_thread_info *mti,
 221                              struct mdt_object *obj,
 222                              struct ldlm_enqueue_info *einfo,
 223                              int decref)
 224 {
 225         union ldlm_policy_data *policy = &mti->mti_policy;
 226         struct mdt_lock_handle *lh = &mti->mti_lh[MDT_LH_LOCAL];
 227         struct lustre_handle_array *slave_locks = einfo->ei_cbdata;
 228         int i;
 229
 230         LASSERT(S_ISDIR(obj->mot_header.loh_attr));
 231         LASSERT(slave_locks);
 232
 233         memset(policy, 0, sizeof(*policy));
 234         policy->l_inodebits.bits = einfo->ei_inodebits;
 235         mdt_lock_handle_init(lh);
 236         mdt_lock_reg_init(lh, einfo->ei_mode);
 237         for (i = 0; i < slave_locks->ha_count; i++) {
 238                 if (test_bit(i, (void *)slave_locks->ha_map))
 239                         lh->mlh_rreg_lh = slave_locks->ha_handles[i];
 240                 else
 241                         lh->mlh_reg_lh = slave_locks->ha_handles[i];
 242                 mdt_object_unlock(mti, NULL, lh, decref);
 243                 slave_locks->ha_handles[i].cookie = 0ull;
 244         }
 245
 246         return mo_object_unlock(mti->mti_env, mdt_object_child(obj), einfo,
 247                                 policy);
 248 }
 249
 250 static inline int mdt_object_striped(struct mdt_thread_info *mti,
 251                                      struct mdt_object *obj)
 252 {
 253         int rc;
 254
 255         if (!S_ISDIR(obj->mot_header.loh_attr))
 256                 return 0;
 257
 258         rc = mo_xattr_get(mti->mti_env, mdt_object_child(obj), &LU_BUF_NULL,
 259                           XATTR_NAME_LMV);
 260         if (rc <= 0)
 261                 return rc == -ENODATA ? 0 : rc;
 262
 263         return 1;
 264 }
 265
 266 /**
 267  * Lock slave stripes if necessary, the lock handles of slave stripes
 268  * will be stored in einfo->ei_cbdata.
 269  **/
 270 static int mdt_lock_slaves(struct mdt_thread_info *mti, struct mdt_object *obj,
 271                            enum ldlm_mode mode, __u64 ibits,
 272                            struct ldlm_enqueue_info *einfo)
 273 {
 274         union ldlm_policy_data *policy = &mti->mti_policy;
 275
 276         LASSERT(S_ISDIR(obj->mot_header.loh_attr));
 277
 278         einfo->ei_type = LDLM_IBITS;
 279         einfo->ei_mode = mode;
 280         einfo->ei_cb_bl = mdt_remote_blocking_ast;
 281         einfo->ei_cb_local_bl = mdt_blocking_ast;
 282         einfo->ei_cb_cp = ldlm_completion_ast;
 283         einfo->ei_enq_slave = 1;
 284         einfo->ei_namespace = mti->mti_mdt->mdt_namespace;
 285         einfo->ei_inodebits = ibits;
 286         memset(policy, 0, sizeof(*policy));
 287         policy->l_inodebits.bits = ibits;
 288
 289         return mo_object_lock(mti->mti_env, mdt_object_child(obj), NULL, einfo,
 290                               policy);
 291 }
 292
 293 int mdt_reint_striped_lock(struct mdt_thread_info *info,
 294                            struct mdt_object *o,
 295                            struct mdt_lock_handle *lh,
 296                            __u64 ibits,
 297                            struct ldlm_enqueue_info *einfo,
 298                            bool cos_incompat)
 299 {
 300         int rc;
 301
 302         LASSERT(!mdt_object_remote(o));
 303
 304         memset(einfo, 0, sizeof(*einfo));
 305
 306         rc = mdt_reint_object_lock(info, o, lh, ibits, cos_incompat);
 307         if (rc)
 308                 return rc;
 309
 310         rc = mdt_object_striped(info, o);
 311         if (rc != 1) {
 312                 if (rc < 0)
 313                         mdt_object_unlock(info, o, lh, rc);
 314                 return rc;
 315         }
 316
 317         rc = mdt_lock_slaves(info, o, lh->mlh_reg_mode, ibits, einfo);
 318         if (rc) {
 319                 mdt_object_unlock(info, o, lh, rc);
 320                 if (rc == -EIO && OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_SLAVE_NAME))
 321                         rc = 0;
 322         }
 323
 324         return rc;
 325 }
 326
 327 void mdt_reint_striped_unlock(struct mdt_thread_info *info,
 328                               struct mdt_object *o,
 329                               struct mdt_lock_handle *lh,
 330                               struct ldlm_enqueue_info *einfo, int decref)
 331 {
 332         if (einfo->ei_cbdata)
 333                 mdt_unlock_slaves(info, o, einfo, decref);
 334         mdt_object_unlock(info, o, lh, decref);
 335 }
 336
 337 /*
 338  * VBR: we save three versions in reply:
 339  * 0 - parent. Check that parent version is the same during replay.
 340  * 1 - name. Version of 'name' if file exists with the same name or
 341  * ENOENT_VERSION, it is needed because file may appear due to missed replays.
 342  * 2 - child. Version of child by FID. Must be ENOENT. It is mostly sanity
 343  * check.
 344  */
 345 static int mdt_create(struct mdt_thread_info *info)
 346 {
 347         struct mdt_device       *mdt = info->mti_mdt;
 348         struct mdt_object       *parent;
 349         struct mdt_object       *child;
 350         struct mdt_lock_handle  *lh;
 351         struct mdt_body         *repbody;
 352         struct md_attr          *ma = &info->mti_attr;
 353         struct mdt_reint_record *rr = &info->mti_rr;
 354         struct md_op_spec       *spec = &info->mti_spec;
 355         int rc;
 356         ENTRY;
 357
 358         DEBUG_REQ(D_INODE, mdt_info_req(info), "Create  ("DNAME"->"DFID") "
 359                   "in "DFID,
 360                   PNAME(&rr->rr_name), PFID(rr->rr_fid2), PFID(rr->rr_fid1));
 361
 362         if (!fid_is_md_operative(rr->rr_fid1))
 363                 RETURN(-EPERM);
 364
 365         if (S_ISDIR(ma->ma_attr.la_mode) &&
 366             spec->u.sp_ea.eadata != NULL && spec->u.sp_ea.eadatalen != 0) {
 367                 const struct lmv_user_md *lum = spec->u.sp_ea.eadata;
 368                 struct lu_ucred *uc = mdt_ucred(info);
 369                 struct obd_export *exp = mdt_info_req(info)->rq_export;
 370
 371                 /* Only new clients can create remote dir( >= 2.4) and
 372                  * striped dir(>= 2.6), old client will return -ENOTSUPP */
 373                 if (!mdt_is_dne_client(exp))
 374                         RETURN(-ENOTSUPP);
 375
 376                 if (le32_to_cpu(lum->lum_stripe_count) > 1) {
 377                         if (!mdt_is_striped_client(exp))
 378                                 RETURN(-ENOTSUPP);
 379
 380                         if (!mdt->mdt_enable_striped_dir)
 381                                 RETURN(-EPERM);
 382                 } else if (!mdt->mdt_enable_remote_dir) {
 383                         RETURN(-EPERM);
 384                 }
 385
 386                 if (!md_capable(uc, CFS_CAP_SYS_ADMIN) &&
 387                     uc->uc_gid != mdt->mdt_enable_remote_dir_gid &&
 388                     mdt->mdt_enable_remote_dir_gid != -1)
 389                         RETURN(-EPERM);
 390         }
 391
 392         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 393
 394         parent = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid1);
 395         if (IS_ERR(parent))
 396                 RETURN(PTR_ERR(parent));
 397
 398         if (!mdt_object_exists(parent))
 399                 GOTO(put_parent, rc = -ENOENT);
 400
 401         lh = &info->mti_lh[MDT_LH_PARENT];
 402         mdt_lock_pdo_init(lh, LCK_PW, &rr->rr_name);
 403         rc = mdt_object_lock(info, parent, lh, MDS_INODELOCK_UPDATE);
 404         if (rc)
 405                 GOTO(put_parent, rc);
 406
 407         if (!mdt_object_remote(parent)) {
 408                 rc = mdt_version_get_check_save(info, parent, 0);
 409                 if (rc)
 410                         GOTO(unlock_parent, rc);
 411         }
 412
 413         /*
 414          * Check child name version during replay.
 415          * During create replay a file may exist with same name.
 416          */
 417         rc = mdt_lookup_version_check(info, parent, &rr->rr_name,
 418                                       &info->mti_tmp_fid1, 1);
 419         if (rc == 0)
 420                 GOTO(unlock_parent, rc = -EEXIST);
 421
 422         /* -ENOENT is expected here */
 423         if (rc != -ENOENT)
 424                 GOTO(unlock_parent, rc);
 425
 426         /* save version of file name for replay, it must be ENOENT here */
 427         mdt_enoent_version_save(info, 1);
 428
 429         child = mdt_object_new(info->mti_env, mdt, rr->rr_fid2);
 430         if (unlikely(IS_ERR(child)))
 431                 GOTO(unlock_parent, rc = PTR_ERR(child));
 432
 433         ma->ma_need = MA_INODE;
 434         ma->ma_valid = 0;
 435
 436         mdt_fail_write(info->mti_env, info->mti_mdt->mdt_bottom,
 437                         OBD_FAIL_MDS_REINT_CREATE_WRITE);
 438
 439         /* Version of child will be updated on disk. */
 440         tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(child));
 441         rc = mdt_version_get_check_save(info, child, 2);
 442         if (rc)
 443                 GOTO(put_child, rc);
 444
 445         /* Let lower layer know current lock mode. */
 446         info->mti_spec.sp_cr_mode = mdt_dlm_mode2mdl_mode(lh->mlh_pdo_mode);
 447
 448         /*
 449          * Do not perform lookup sanity check. We know that name does
 450          * not exist.
 451          */
 452         info->mti_spec.sp_cr_lookup = 0;
 453         info->mti_spec.sp_feat = &dt_directory_features;
 454
 455         rc = mdo_create(info->mti_env, mdt_object_child(parent), &rr->rr_name,
 456                         mdt_object_child(child), &info->mti_spec, ma);
 457         if (rc == 0)
 458                 rc = mdt_attr_get_complex(info, child, ma);
 459
 460         if (rc < 0)
 461                 GOTO(put_child, rc);
 462
 463         /*
 464          * On DNE, we need to eliminate dependey between 'mkdir a' and
 465          * 'mkdir a/b' if b is a striped directory, to achieve this, two
 466          * things are done below:
 467          * 1. save child and slaves lock.
 468          * 2. if the child is a striped directory, relock parent so to
 469          *    compare against with COS locks to ensure parent was
 470          *    committed to disk.
 471          */
 472         if (mdt_slc_is_enabled(mdt) && S_ISDIR(ma->ma_attr.la_mode)) {
 473                 struct mdt_lock_handle *lhc;
 474                 struct ldlm_enqueue_info *einfo = &info->mti_einfo[0];
 475                 bool cos_incompat;
 476
 477                 rc = mdt_object_striped(info, child);
 478                 if (rc < 0)
 479                         GOTO(put_child, rc);
 480
 481                 cos_incompat = rc;
 482                 if (cos_incompat) {
 483                         if (!mdt_object_remote(parent)) {
 484                                 mdt_object_unlock(info, parent, lh, 1);
 485                                 mdt_lock_pdo_init(lh, LCK_PW, &rr->rr_name);
 486                                 rc = mdt_reint_object_lock(info, parent, lh,
 487                                                            MDS_INODELOCK_UPDATE,
 488                                                            true);
 489                                 if (rc)
 490                                         GOTO(put_child, rc);
 491                         }
 492                 }
 493
 494                 lhc = &info->mti_lh[MDT_LH_CHILD];
 495                 mdt_lock_handle_init(lhc);
 496                 mdt_lock_reg_init(lhc, LCK_PW);
 497                 rc = mdt_reint_striped_lock(info, child, lhc,
 498                                             MDS_INODELOCK_UPDATE, einfo,
 499                                             cos_incompat);
 500                 if (rc)
 501                         GOTO(put_child, rc);
 502
 503                 mdt_reint_striped_unlock(info, child, lhc, einfo, rc);
 504         }
 505
 506         /* Return fid & attr to client. */
 507         if (ma->ma_valid & MA_INODE)
 508                 mdt_pack_attr2body(info, repbody, &ma->ma_attr,
 509                                    mdt_object_fid(child));
 510 put_child:
 511         mdt_object_put(info->mti_env, child);
 512 unlock_parent:
 513         mdt_object_unlock(info, parent, lh, rc);
 514 put_parent:
 515         mdt_object_put(info->mti_env, parent);
 516         RETURN(rc);
 517 }
 518
 519 static int mdt_attr_set(struct mdt_thread_info *info, struct mdt_object *mo,
 520                         struct md_attr *ma)
 521 {
 522         struct mdt_lock_handle  *lh;
 523         int do_vbr = ma->ma_attr.la_valid &
 524                         (LA_MODE | LA_UID | LA_GID | LA_PROJID | LA_FLAGS);
 525         __u64 lockpart = MDS_INODELOCK_UPDATE;
 526         struct ldlm_enqueue_info *einfo = &info->mti_einfo[0];
 527         bool cos_incompat;
 528         int rc;
 529         ENTRY;
 530
 531         rc = mdt_object_striped(info, mo);
 532         if (rc < 0)
 533                 RETURN(rc);
 534
 535         cos_incompat = rc;
 536
 537         lh = &info->mti_lh[MDT_LH_PARENT];
 538         mdt_lock_reg_init(lh, LCK_PW);
 539
 540         /* Even though the new MDT will grant PERM lock to the old
 541          * client, but the old client will almost ignore that during
 542          * So it needs to revoke both LOOKUP and PERM lock here, so
 543          * both new and old client can cancel the dcache */
 544         if (ma->ma_attr.la_valid & (LA_MODE|LA_UID|LA_GID))
 545                 lockpart |= MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
 546
 547         rc = mdt_reint_striped_lock(info, mo, lh, lockpart, einfo,
 548                                     cos_incompat);
 549         if (rc != 0)
 550                 RETURN(rc);
 551
 552         /* all attrs are packed into mti_attr in unpack_setattr */
 553         mdt_fail_write(info->mti_env, info->mti_mdt->mdt_bottom,
 554                        OBD_FAIL_MDS_REINT_SETATTR_WRITE);
 555
 556         /* VBR: update version if attr changed are important for recovery */
 557         if (do_vbr) {
 558                 /* update on-disk version of changed object */
 559                 tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(mo));
 560                 rc = mdt_version_get_check_save(info, mo, 0);
 561                 if (rc)
 562                         GOTO(out_unlock, rc);
 563         }
 564
 565         /* Ensure constant striping during chown(). See LU-2789. */
 566         if (ma->ma_attr.la_valid & (LA_UID|LA_GID|LA_PROJID))
 567                 mutex_lock(&mo->mot_lov_mutex);
 568
 569         /* all attrs are packed into mti_attr in unpack_setattr */
 570         rc = mo_attr_set(info->mti_env, mdt_object_child(mo), ma);
 571
 572         if (ma->ma_attr.la_valid & (LA_UID|LA_GID|LA_PROJID))
 573                 mutex_unlock(&mo->mot_lov_mutex);
 574
 575         if (rc != 0)
 576                 GOTO(out_unlock, rc);
 577         mdt_dom_obj_lvb_update(info->mti_env, mo, false);
 578         EXIT;
 579 out_unlock:
 580         mdt_reint_striped_unlock(info, mo, lh, einfo, rc);
 581         return rc;
 582 }
 583
 584 /**
 585  * Check HSM flags and add HS_DIRTY flag if relevant.
 586  *
 587  * A file could be set dirty only if it has a copy in the backend (HS_EXISTS)
 588  * and is not RELEASED.
 589  */
 590 int mdt_add_dirty_flag(struct mdt_thread_info *info, struct mdt_object *mo,
 591                         struct md_attr *ma)
 592 {
 593         struct lu_ucred *uc = mdt_ucred(info);
 594         cfs_cap_t cap_saved;
 595         int rc;
 596         ENTRY;
 597
 598         /* If the file was modified, add the dirty flag */
 599         ma->ma_need = MA_HSM;
 600         rc = mdt_attr_get_complex(info, mo, ma);
 601         if (rc) {
 602                 CERROR("file attribute read error for "DFID": %d.\n",
 603                         PFID(mdt_object_fid(mo)), rc);
 604                 RETURN(rc);
 605         }
 606
 607         /* If an up2date copy exists in the backend, add dirty flag */
 608         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_EXISTS)
 609             && !(ma->ma_hsm.mh_flags & (HS_DIRTY|HS_RELEASED))) {
 610                 ma->ma_hsm.mh_flags |= HS_DIRTY;
 611
 612                 /* Bump cap so that closes from non-owner writers can
 613                  * set the HSM state to dirty. */
 614                 cap_saved = uc->uc_cap;
 615                 uc->uc_cap |= MD_CAP_TO_MASK(CFS_CAP_FOWNER);
 616                 rc = mdt_hsm_attr_set(info, mo, &ma->ma_hsm);
 617                 uc->uc_cap = cap_saved;
 618                 if (rc)
 619                         CERROR("file attribute change error for "DFID": %d\n",
 620                                 PFID(mdt_object_fid(mo)), rc);
 621         }
 622
 623         RETURN(rc);
 624 }
 625
 626 static int mdt_reint_setattr(struct mdt_thread_info *info,
 627                              struct mdt_lock_handle *lhc)
 628 {
 629         struct mdt_device *mdt = info->mti_mdt;
 630         struct md_attr *ma = &info->mti_attr;
 631         struct mdt_reint_record *rr = &info->mti_rr;
 632         struct ptlrpc_request *req = mdt_info_req(info);
 633         struct mdt_object *mo;
 634         struct mdt_body *repbody;
 635         int rc, rc2;
 636         ENTRY;
 637
 638         DEBUG_REQ(D_INODE, req, "setattr "DFID" %x", PFID(rr->rr_fid1),
 639                   (unsigned int)ma->ma_attr.la_valid);
 640
 641         if (info->mti_dlm_req)
 642                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
 643
 644         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 645         mo = mdt_object_find(info->mti_env, mdt, rr->rr_fid1);
 646         if (IS_ERR(mo))
 647                 GOTO(out, rc = PTR_ERR(mo));
 648
 649         if (!mdt_object_exists(mo))
 650                 GOTO(out_put, rc = -ENOENT);
 651
 652         if (mdt_object_remote(mo))
 653                 GOTO(out_put, rc = -EREMOTE);
 654
 655         /* revoke lease lock if size is going to be changed */
 656         if (unlikely(ma->ma_attr.la_valid & LA_SIZE &&
 657                      !(ma->ma_attr_flags & MDS_TRUNC_KEEP_LEASE) &&
 658                      atomic_read(&mo->mot_lease_count) > 0)) {
 659                 down_read(&mo->mot_open_sem);
 660
 661                 if (atomic_read(&mo->mot_lease_count) > 0) { /* lease exists */
 662                         lhc = &info->mti_lh[MDT_LH_LOCAL];
 663                         mdt_lock_reg_init(lhc, LCK_CW);
 664
 665                         rc = mdt_object_lock(info, mo, lhc, MDS_INODELOCK_OPEN);
 666                         if (rc != 0) {
 667                                 up_read(&mo->mot_open_sem);
 668                                 GOTO(out_put, rc);
 669                         }
 670
 671                         /* revoke lease lock */
 672                         mdt_object_unlock(info, mo, lhc, 1);
 673                 }
 674                 up_read(&mo->mot_open_sem);
 675         }
 676
 677         if (ma->ma_attr.la_valid & LA_SIZE || rr->rr_flags & MRF_OPEN_TRUNC) {
 678                 /* Check write access for the O_TRUNC case */
 679                 if (mdt_write_read(mo) < 0)
 680                         GOTO(out_put, rc = -ETXTBSY);
 681
 682                 /* LU-10286: compatibility check for FLR.
 683                  * Please check the comment in mdt_finish_open() for details */
 684                 if (!exp_connect_flr(info->mti_exp) ||
 685                     !exp_connect_overstriping(info->mti_exp)) {
 686                         rc = mdt_big_xattr_get(info, mo, XATTR_NAME_LOV);
 687                         if (rc < 0 && rc != -ENODATA)
 688                                 GOTO(out_put, rc);
 689
 690                         if (!exp_connect_flr(info->mti_exp)) {
 691                                 if (rc > 0 &&
 692                                     mdt_lmm_is_flr(info->mti_big_lmm))
 693                                         GOTO(out_put, rc = -EOPNOTSUPP);
 694                         }
 695
 696                         if (!exp_connect_overstriping(info->mti_exp)) {
 697                                 if (rc > 0 &&
 698                                     mdt_lmm_is_overstriping(info->mti_big_lmm))
 699                                         GOTO(out_put, rc = -EOPNOTSUPP);
 700                         }
 701                 }
 702
 703                 /* For truncate, the file size sent from client
 704                  * is believable, but the blocks are incorrect,
 705                  * which makes the block size in LSOM attribute
 706                  * inconsisent with the real block size.
 707                  */
 708                 rc = mdt_lsom_update(info, mo, true);
 709                 if (rc)
 710                         GOTO(out_put, rc);
 711         }
 712
 713         if ((ma->ma_valid & MA_INODE) && ma->ma_attr.la_valid) {
 714                 if (ma->ma_valid & MA_LOV)
 715                         GOTO(out_put, rc = -EPROTO);
 716
 717                 /* MDT supports FMD for regular files due to Data-on-MDT */
 718                 if (S_ISREG(lu_object_attr(&mo->mot_obj)) &&
 719                     ma->ma_attr.la_valid & (LA_ATIME | LA_MTIME | LA_CTIME))
 720                         tgt_fmd_update(info->mti_exp, mdt_object_fid(mo),
 721                                        req->rq_xid);
 722
 723                 rc = mdt_attr_set(info, mo, ma);
 724                 if (rc)
 725                         GOTO(out_put, rc);
 726         } else if ((ma->ma_valid & (MA_LOV | MA_LMV)) &&
 727                    (ma->ma_valid & MA_INODE)) {
 728                 struct lu_buf *buf = &info->mti_buf;
 729                 struct lu_ucred *uc = mdt_ucred(info);
 730                 struct mdt_lock_handle *lh;
 731
 732                 /* reject if either remote or striped dir is disabled */
 733                 if (ma->ma_valid & MA_LMV) {
 734                         if (!mdt->mdt_enable_remote_dir ||
 735                             !mdt->mdt_enable_striped_dir)
 736                                 GOTO(out_put, rc = -EPERM);
 737
 738                         if (!md_capable(uc, CFS_CAP_SYS_ADMIN) &&
 739                             uc->uc_gid != mdt->mdt_enable_remote_dir_gid &&
 740                             mdt->mdt_enable_remote_dir_gid != -1)
 741                                 GOTO(out_put, rc = -EPERM);
 742                 }
 743
 744                 if (ma->ma_attr.la_valid != 0)
 745                         GOTO(out_put, rc = -EPROTO);
 746
 747                 lh = &info->mti_lh[MDT_LH_PARENT];
 748                 mdt_lock_reg_init(lh, LCK_PW);
 749
 750                 rc = mdt_object_lock(info, mo, lh, MDS_INODELOCK_XATTR);
 751                 if (rc != 0)
 752                         GOTO(out_put, rc);
 753
 754                 if (ma->ma_valid & MA_LOV) {
 755                         buf->lb_buf = ma->ma_lmm;
 756                         buf->lb_len = ma->ma_lmm_size;
 757                 } else {
 758                         buf->lb_buf = ma->ma_lmv;
 759                         buf->lb_len = ma->ma_lmv_size;
 760                 }
 761                 rc = mo_xattr_set(info->mti_env, mdt_object_child(mo), buf,
 762                                   (ma->ma_valid & MA_LOV) ?
 763                                         XATTR_NAME_LOV : XATTR_NAME_DEFAULT_LMV,
 764                                   0);
 765
 766                 mdt_object_unlock(info, mo, lh, rc);
 767                 if (rc)
 768                         GOTO(out_put, rc);
 769         } else {
 770                 GOTO(out_put, rc = -EPROTO);
 771         }
 772
 773         /* If file data is modified, add the dirty flag */
 774         if (ma->ma_attr_flags & MDS_DATA_MODIFIED)
 775                 rc = mdt_add_dirty_flag(info, mo, ma);
 776
 777         ma->ma_need = MA_INODE;
 778         ma->ma_valid = 0;
 779         rc = mdt_attr_get_complex(info, mo, ma);
 780         if (rc != 0)
 781                 GOTO(out_put, rc);
 782
 783         mdt_pack_attr2body(info, repbody, &ma->ma_attr, mdt_object_fid(mo));
 784
 785         EXIT;
 786 out_put:
 787         mdt_object_put(info->mti_env, mo);
 788 out:
 789         if (rc == 0)
 790                 mdt_counter_incr(req, LPROC_MDT_SETATTR);
 791
 792         mdt_client_compatibility(info);
 793         rc2 = mdt_fix_reply(info);
 794         if (rc == 0)
 795                 rc = rc2;
 796         return rc;
 797 }
 798
 799 static int mdt_reint_create(struct mdt_thread_info *info,
 800                             struct mdt_lock_handle *lhc)
 801 {
 802         struct ptlrpc_request   *req = mdt_info_req(info);
 803         int                     rc;
 804         ENTRY;
 805
 806         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE))
 807                 RETURN(err_serious(-ESTALE));
 808
 809         if (info->mti_dlm_req)
 810                 ldlm_request_cancel(mdt_info_req(info),
 811                                     info->mti_dlm_req, 0, LATF_SKIP);
 812
 813         if (!lu_name_is_valid(&info->mti_rr.rr_name))
 814                 RETURN(-EPROTO);
 815
 816         switch (info->mti_attr.ma_attr.la_mode & S_IFMT) {
 817         case S_IFDIR:
 818                 mdt_counter_incr(req, LPROC_MDT_MKDIR);
 819                 break;
 820         case S_IFREG:
 821         case S_IFLNK:
 822         case S_IFCHR:
 823         case S_IFBLK:
 824         case S_IFIFO:
 825         case S_IFSOCK:
 826                 /* Special file should stay on the same node as parent. */
 827                 mdt_counter_incr(req, LPROC_MDT_MKNOD);
 828                 break;
 829         default:
 830                 CERROR("%s: Unsupported mode %o\n",
 831                        mdt_obd_name(info->mti_mdt),
 832                        info->mti_attr.ma_attr.la_mode);
 833                 RETURN(err_serious(-EOPNOTSUPP));
 834         }
 835
 836         rc = mdt_create(info);
 837         RETURN(rc);
 838 }
 839
 840 /*
 841  * VBR: save parent version in reply and child version getting by its name.
 842  * Version of child is getting and checking during its lookup. If
 843  */
 844 static int mdt_reint_unlink(struct mdt_thread_info *info,
 845                             struct mdt_lock_handle *lhc)
 846 {
 847         struct mdt_reint_record *rr = &info->mti_rr;
 848         struct ptlrpc_request *req = mdt_info_req(info);
 849         struct md_attr *ma = &info->mti_attr;
 850         struct lu_fid *child_fid = &info->mti_tmp_fid1;
 851         struct mdt_object *mp;
 852         struct mdt_object *mc;
 853         struct mdt_lock_handle *parent_lh;
 854         struct mdt_lock_handle *child_lh;
 855         struct ldlm_enqueue_info *einfo = &info->mti_einfo[0];
 856         __u64 lock_ibits;
 857         bool cos_incompat = false;
 858         int no_name = 0;
 859         int rc;
 860
 861         ENTRY;
 862
 863         DEBUG_REQ(D_INODE, req, "unlink "DFID"/"DNAME"", PFID(rr->rr_fid1),
 864                   PNAME(&rr->rr_name));
 865
 866         if (info->mti_dlm_req)
 867                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
 868
 869         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK))
 870                 RETURN(err_serious(-ENOENT));
 871
 872         if (!fid_is_md_operative(rr->rr_fid1))
 873                 RETURN(-EPERM);
 874
 875         mp = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid1);
 876         if (IS_ERR(mp))
 877                 RETURN(PTR_ERR(mp));
 878
 879         if (mdt_object_remote(mp)) {
 880                 cos_incompat = true;
 881         } else {
 882                 rc = mdt_version_get_check_save(info, mp, 0);
 883                 if (rc)
 884                         GOTO(put_parent, rc);
 885         }
 886
 887 relock:
 888         parent_lh = &info->mti_lh[MDT_LH_PARENT];
 889         mdt_lock_pdo_init(parent_lh, LCK_PW, &rr->rr_name);
 890         rc = mdt_reint_object_lock(info, mp, parent_lh, MDS_INODELOCK_UPDATE,
 891                                    cos_incompat);
 892         if (rc != 0)
 893                 GOTO(put_parent, rc);
 894
 895         /* lookup child object along with version checking */
 896         fid_zero(child_fid);
 897         rc = mdt_lookup_version_check(info, mp, &rr->rr_name, child_fid, 1);
 898         if (rc != 0) {
 899                 /* Name might not be able to find during resend of
 900                  * remote unlink, considering following case.
 901                  * dir_A is a remote directory, the name entry of
 902                  * dir_A is on MDT0, the directory is on MDT1,
 903                  *
 904                  * 1. client sends unlink req to MDT1.
 905                  * 2. MDT1 sends name delete update to MDT0.
 906                  * 3. name entry is being deleted in MDT0 synchronously.
 907                  * 4. MDT1 is restarted.
 908                  * 5. client resends unlink req to MDT1. So it can not
 909                  *    find the name entry on MDT0 anymore.
 910                  * In this case, MDT1 only needs to destory the local
 911                  * directory.
 912                  * */
 913                 if (mdt_object_remote(mp) && rc == -ENOENT &&
 914                     !fid_is_zero(rr->rr_fid2) &&
 915                     lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) {
 916                         no_name = 1;
 917                         *child_fid = *rr->rr_fid2;
 918                  } else {
 919                         GOTO(unlock_parent, rc);
 920                  }
 921         }
 922
 923         if (!fid_is_md_operative(child_fid))
 924                 GOTO(unlock_parent, rc = -EPERM);
 925
 926         /* We will lock the child regardless it is local or remote. No harm. */
 927         mc = mdt_object_find(info->mti_env, info->mti_mdt, child_fid);
 928         if (IS_ERR(mc))
 929                 GOTO(unlock_parent, rc = PTR_ERR(mc));
 930
 931         if (!cos_incompat) {
 932                 rc = mdt_object_striped(info, mc);
 933                 if (rc < 0)
 934                         GOTO(unlock_parent, rc);
 935
 936                 cos_incompat = rc;
 937                 if (cos_incompat) {
 938                         mdt_object_put(info->mti_env, mc);
 939                         mdt_object_unlock(info, mp, parent_lh, -EAGAIN);
 940                         goto relock;
 941                 }
 942         }
 943
 944         child_lh = &info->mti_lh[MDT_LH_CHILD];
 945         mdt_lock_reg_init(child_lh, LCK_EX);
 946         if (info->mti_spec.sp_rm_entry) {
 947                 struct lu_ucred *uc  = mdt_ucred(info);
 948
 949                 if (!mdt_is_dne_client(req->rq_export))
 950                         /* Return -ENOTSUPP for old client */
 951                         GOTO(put_child, rc = -ENOTSUPP);
 952
 953                 if (!md_capable(uc, CFS_CAP_SYS_ADMIN))
 954                         GOTO(put_child, rc = -EPERM);
 955
 956                 ma->ma_need = MA_INODE;
 957                 ma->ma_valid = 0;
 958                 rc = mdo_unlink(info->mti_env, mdt_object_child(mp),
 959                                 NULL, &rr->rr_name, ma, no_name);
 960                 GOTO(put_child, rc);
 961         }
 962
 963         if (mdt_object_remote(mc)) {
 964                 struct mdt_body  *repbody;
 965
 966                 if (!fid_is_zero(rr->rr_fid2)) {
 967                         CDEBUG(D_INFO, "%s: name "DNAME" cannot find "DFID"\n",
 968                                mdt_obd_name(info->mti_mdt),
 969                                PNAME(&rr->rr_name), PFID(mdt_object_fid(mc)));
 970                         GOTO(put_child, rc = -ENOENT);
 971                 }
 972                 CDEBUG(D_INFO, "%s: name "DNAME": "DFID" is on another MDT\n",
 973                        mdt_obd_name(info->mti_mdt),
 974                        PNAME(&rr->rr_name), PFID(mdt_object_fid(mc)));
 975
 976                 if (!mdt_is_dne_client(req->rq_export))
 977                         /* Return -ENOTSUPP for old client */
 978                         GOTO(put_child, rc = -ENOTSUPP);
 979
 980                 /* Revoke the LOOKUP lock of the remote object granted by
 981                  * this MDT. Since the unlink will happen on another MDT,
 982                  * it will release the LOOKUP lock right away. Then What
 983                  * would happen if another client try to grab the LOOKUP
 984                  * lock at the same time with unlink XXX */
 985                 mdt_object_lock(info, mc, child_lh, MDS_INODELOCK_LOOKUP);
 986                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 987                 LASSERT(repbody != NULL);
 988                 repbody->mbo_fid1 = *mdt_object_fid(mc);
 989                 repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
 990                 GOTO(unlock_child, rc = -EREMOTE);
 991         }
 992         /* We used to acquire MDS_INODELOCK_FULL here but we can't do
 993          * this now because a running HSM restore on the child (unlink
 994          * victim) will hold the layout lock. See LU-4002. */
 995         lock_ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
 996         if (mdt_object_remote(mp)) {
 997                 /* Enqueue lookup lock from parent MDT */
 998                 rc = mdt_remote_object_lock(info, mp, mdt_object_fid(mc),
 999                                             &child_lh->mlh_rreg_lh,
1000                                             child_lh->mlh_rreg_mode,
1001                                             MDS_INODELOCK_LOOKUP, false);
1002                 if (rc != ELDLM_OK)
1003                         GOTO(put_child, rc);
1004
1005                 lock_ibits &= ~MDS_INODELOCK_LOOKUP;
1006         }
1007
1008         rc = mdt_reint_striped_lock(info, mc, child_lh, lock_ibits, einfo,
1009                                     cos_incompat);
1010         if (rc != 0)
1011                 GOTO(put_child, rc);
1012
1013         /*
1014          * Now we can only make sure we need MA_INODE, in mdd layer, will check
1015          * whether need MA_LOV and MA_COOKIE.
1016          */
1017         ma->ma_need = MA_INODE;
1018         ma->ma_valid = 0;
1019
1020         mdt_fail_write(info->mti_env, info->mti_mdt->mdt_bottom,
1021                        OBD_FAIL_MDS_REINT_UNLINK_WRITE);
1022         /* save version when object is locked */
1023         mdt_version_get_save(info, mc, 1);
1024
1025         mutex_lock(&mc->mot_lov_mutex);
1026
1027         rc = mdo_unlink(info->mti_env, mdt_object_child(mp),
1028                         mdt_object_child(mc), &rr->rr_name, ma, no_name);
1029
1030         mutex_unlock(&mc->mot_lov_mutex);
1031         if (rc != 0)
1032                 GOTO(unlock_child, rc);
1033
1034         if (!lu_object_is_dying(&mc->mot_header)) {
1035                 rc = mdt_attr_get_complex(info, mc, ma);
1036                 if (rc)
1037                         GOTO(out_stat, rc);
1038         } else if (mdt_dom_check_for_discard(info, mc)) {
1039                 mdt_dom_discard_data(info, mc);
1040         }
1041         mdt_handle_last_unlink(info, mc, ma);
1042
1043 out_stat:
1044         if (ma->ma_valid & MA_INODE) {
1045                 switch (ma->ma_attr.la_mode & S_IFMT) {
1046                 case S_IFDIR:
1047                         mdt_counter_incr(req, LPROC_MDT_RMDIR);
1048                         break;
1049                 case S_IFREG:
1050                 case S_IFLNK:
1051                 case S_IFCHR:
1052                 case S_IFBLK:
1053                 case S_IFIFO:
1054                 case S_IFSOCK:
1055                         mdt_counter_incr(req, LPROC_MDT_UNLINK);
1056                         break;
1057                 default:
1058                         LASSERTF(0, "bad file type %o unlinking\n",
1059                                 ma->ma_attr.la_mode);
1060                 }
1061         }
1062
1063         EXIT;
1064
1065 unlock_child:
1066         mdt_reint_striped_unlock(info, mc, child_lh, einfo, rc);
1067 put_child:
1068         mdt_object_put(info->mti_env, mc);
1069 unlock_parent:
1070         mdt_object_unlock(info, mp, parent_lh, rc);
1071 put_parent:
1072         mdt_object_put(info->mti_env, mp);
1073         return rc;
1074 }
1075
1076 /*
1077  * VBR: save versions in reply: 0 - parent; 1 - child by fid; 2 - target by
1078  * name.
1079  */
1080 static int mdt_reint_link(struct mdt_thread_info *info,
1081                           struct mdt_lock_handle *lhc)
1082 {
1083         struct mdt_reint_record *rr = &info->mti_rr;
1084         struct ptlrpc_request   *req = mdt_info_req(info);
1085         struct md_attr          *ma = &info->mti_attr;
1086         struct mdt_object       *ms;
1087         struct mdt_object       *mp;
1088         struct mdt_lock_handle  *lhs;
1089         struct mdt_lock_handle  *lhp;
1090         bool cos_incompat;
1091         int rc;
1092         ENTRY;
1093
1094         DEBUG_REQ(D_INODE, req, "link "DFID" to "DFID"/"DNAME,
1095                   PFID(rr->rr_fid1), PFID(rr->rr_fid2), PNAME(&rr->rr_name));
1096
1097         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK))
1098                 RETURN(err_serious(-ENOENT));
1099
1100         if (info->mti_dlm_req)
1101                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1102
1103         /* Invalid case so return error immediately instead of
1104          * processing it */
1105         if (lu_fid_eq(rr->rr_fid1, rr->rr_fid2))
1106                 RETURN(-EPERM);
1107
1108         if (!fid_is_md_operative(rr->rr_fid1) ||
1109             !fid_is_md_operative(rr->rr_fid2))
1110                 RETURN(-EPERM);
1111
1112         /* step 1: find target parent dir */
1113         mp = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid2);
1114         if (IS_ERR(mp))
1115                 RETURN(PTR_ERR(mp));
1116
1117         rc = mdt_version_get_check_save(info, mp, 0);
1118         if (rc)
1119                 GOTO(put_parent, rc);
1120
1121         /* step 2: find source */
1122         ms = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid1);
1123         if (IS_ERR(ms))
1124                 GOTO(put_parent, rc = PTR_ERR(ms));
1125
1126         if (!mdt_object_exists(ms)) {
1127                 CDEBUG(D_INFO, "%s: "DFID" does not exist.\n",
1128                        mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1));
1129                 GOTO(put_source, rc = -ENOENT);
1130         }
1131
1132         cos_incompat = (mdt_object_remote(mp) || mdt_object_remote(ms));
1133
1134         lhp = &info->mti_lh[MDT_LH_PARENT];
1135         mdt_lock_pdo_init(lhp, LCK_PW, &rr->rr_name);
1136         rc = mdt_reint_object_lock(info, mp, lhp, MDS_INODELOCK_UPDATE,
1137                                    cos_incompat);
1138         if (rc != 0)
1139                 GOTO(put_source, rc);
1140
1141         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME3, 5);
1142
1143         lhs = &info->mti_lh[MDT_LH_CHILD];
1144         mdt_lock_reg_init(lhs, LCK_EX);
1145         rc = mdt_reint_object_lock(info, ms, lhs,
1146                                    MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1147                                    cos_incompat);
1148         if (rc != 0)
1149                 GOTO(unlock_parent, rc);
1150
1151         /* step 3: link it */
1152         mdt_fail_write(info->mti_env, info->mti_mdt->mdt_bottom,
1153                         OBD_FAIL_MDS_REINT_LINK_WRITE);
1154
1155         tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(ms));
1156         rc = mdt_version_get_check_save(info, ms, 1);
1157         if (rc)
1158                 GOTO(unlock_source, rc);
1159
1160         /** check target version by name during replay */
1161         rc = mdt_lookup_version_check(info, mp, &rr->rr_name,
1162                                       &info->mti_tmp_fid1, 2);
1163         if (rc != 0 && rc != -ENOENT)
1164                 GOTO(unlock_source, rc);
1165         /* save version of file name for replay, it must be ENOENT here */
1166         if (!req_is_replay(mdt_info_req(info))) {
1167                 if (rc != -ENOENT) {
1168                         CDEBUG(D_INFO, "link target "DNAME" existed!\n",
1169                                PNAME(&rr->rr_name));
1170                         GOTO(unlock_source, rc = -EEXIST);
1171                 }
1172                 info->mti_ver[2] = ENOENT_VERSION;
1173                 mdt_version_save(mdt_info_req(info), info->mti_ver[2], 2);
1174         }
1175
1176         rc = mdo_link(info->mti_env, mdt_object_child(mp),
1177                       mdt_object_child(ms), &rr->rr_name, ma);
1178
1179         if (rc == 0)
1180                 mdt_counter_incr(req, LPROC_MDT_LINK);
1181
1182         EXIT;
1183 unlock_source:
1184         mdt_object_unlock(info, ms, lhs, rc);
1185 unlock_parent:
1186         mdt_object_unlock(info, mp, lhp, rc);
1187 put_source:
1188         mdt_object_put(info->mti_env, ms);
1189 put_parent:
1190         mdt_object_put(info->mti_env, mp);
1191         return rc;
1192 }
1193 /**
1194  * lock the part of the directory according to the hash of the name
1195  * (lh->mlh_pdo_hash) in parallel directory lock.
1196  */
1197 static int mdt_pdir_hash_lock(struct mdt_thread_info *info,
1198                               struct mdt_lock_handle *lh,
1199                               struct mdt_object *obj, __u64 ibits,
1200                               bool cos_incompat)
1201 {
1202         struct ldlm_res_id *res = &info->mti_res_id;
1203         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
1204         union ldlm_policy_data *policy = &info->mti_policy;
1205         __u64 dlmflags = LDLM_FL_LOCAL_ONLY | LDLM_FL_ATOMIC_CB;
1206         int rc;
1207
1208         /*
1209          * Finish res_id initializing by name hash marking part of
1210          * directory which is taking modification.
1211          */
1212         LASSERT(lh->mlh_pdo_hash != 0);
1213         fid_build_pdo_res_name(mdt_object_fid(obj), lh->mlh_pdo_hash, res);
1214         memset(policy, 0, sizeof(*policy));
1215         policy->l_inodebits.bits = ibits;
1216         if (cos_incompat &&
1217             (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
1218                 dlmflags |= LDLM_FL_COS_INCOMPAT;
1219         /*
1220          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
1221          * going to be sent to client. If it is - mdt_intent_policy() path will
1222          * fix it up and turn FL_LOCAL flag off.
1223          */
1224         rc = mdt_fid_lock(info->mti_env, ns, &lh->mlh_reg_lh, lh->mlh_reg_mode,
1225                           policy, res, dlmflags,
1226                           &info->mti_exp->exp_handle.h_cookie);
1227         return rc;
1228 }
1229
1230 /**
1231  * Get BFL lock for rename or migrate process.
1232  **/
1233 static int mdt_rename_lock(struct mdt_thread_info *info,
1234                            struct lustre_handle *lh)
1235 {
1236         int     rc;
1237         ENTRY;
1238
1239         if (mdt_seq_site(info->mti_mdt)->ss_node_id != 0) {
1240                 struct lu_fid *fid = &info->mti_tmp_fid1;
1241                 struct mdt_object *obj;
1242
1243                 /* XXX, right now, it has to use object API to
1244                  * enqueue lock cross MDT, so it will enqueue
1245                  * rename lock(with LUSTRE_BFL_FID) by root object */
1246                 lu_root_fid(fid);
1247                 obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1248                 if (IS_ERR(obj))
1249                         RETURN(PTR_ERR(obj));
1250
1251                 rc = mdt_remote_object_lock(info, obj,
1252                                             &LUSTRE_BFL_FID, lh,
1253                                             LCK_EX,
1254                                             MDS_INODELOCK_UPDATE, false);
1255                 mdt_object_put(info->mti_env, obj);
1256         } else {
1257                 struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
1258                 union ldlm_policy_data *policy = &info->mti_policy;
1259                 struct ldlm_res_id *res_id = &info->mti_res_id;
1260                 __u64 flags = 0;
1261
1262                 fid_build_reg_res_name(&LUSTRE_BFL_FID, res_id);
1263                 memset(policy, 0, sizeof *policy);
1264                 policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
1265                 flags = LDLM_FL_LOCAL_ONLY | LDLM_FL_ATOMIC_CB;
1266                 rc = ldlm_cli_enqueue_local(info->mti_env, ns, res_id,
1267                                             LDLM_IBITS, policy, LCK_EX, &flags,
1268                                             ldlm_blocking_ast,
1269                                             ldlm_completion_ast, NULL, NULL, 0,
1270                                             LVB_T_NONE,
1271                                             &info->mti_exp->exp_handle.h_cookie,
1272                                             lh);
1273                 RETURN(rc);
1274         }
1275         RETURN(rc);
1276 }
1277
1278 static void mdt_rename_unlock(struct lustre_handle *lh)
1279 {
1280         ENTRY;
1281         LASSERT(lustre_handle_is_used(lh));
1282         /* Cancel the single rename lock right away */
1283         ldlm_lock_decref_and_cancel(lh, LCK_EX);
1284         EXIT;
1285 }
1286
1287 static struct mdt_object *mdt_parent_find_check(struct mdt_thread_info *info,
1288                                                 const struct lu_fid *fid,
1289                                                 int idx)
1290 {
1291         struct mdt_object *dir;
1292         int rc;
1293
1294         ENTRY;
1295
1296         dir = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1297         if (IS_ERR(dir))
1298                 RETURN(dir);
1299
1300         /* check early, the real version will be saved after locking */
1301         rc = mdt_version_get_check(info, dir, idx);
1302         if (rc)
1303                 GOTO(out_put, rc);
1304
1305         if (!mdt_object_exists(dir))
1306                 GOTO(out_put, rc = -ENOENT);
1307
1308         if (!S_ISDIR(lu_object_attr(&dir->mot_obj)))
1309                 GOTO(out_put, rc = -ENOTDIR);
1310
1311         RETURN(dir);
1312 out_put:
1313         mdt_object_put(info->mti_env, dir);
1314         return ERR_PTR(rc);
1315 }
1316
1317 /*
1318  * in case obj is remote obj on its parent, revoke LOOKUP lock,
1319  * herein we don't really check it, just do revoke.
1320  */
1321 int mdt_revoke_remote_lookup_lock(struct mdt_thread_info *info,
1322                                   struct mdt_object *pobj,
1323                                   struct mdt_object *obj)
1324 {
1325         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LOCAL];
1326         int rc;
1327
1328         mdt_lock_handle_init(lh);
1329         mdt_lock_reg_init(lh, LCK_EX);
1330
1331         if (mdt_object_remote(pobj)) {
1332                 /* don't bother to check if pobj and obj are on the same MDT. */
1333                 rc = mdt_remote_object_lock(info, pobj, mdt_object_fid(obj),
1334                                             &lh->mlh_rreg_lh, LCK_EX,
1335                                             MDS_INODELOCK_LOOKUP, false);
1336         } else if (mdt_object_remote(obj)) {
1337                 struct ldlm_res_id *res = &info->mti_res_id;
1338                 union ldlm_policy_data *policy = &info->mti_policy;
1339                 __u64 dlmflags = LDLM_FL_LOCAL_ONLY | LDLM_FL_ATOMIC_CB |
1340                                  LDLM_FL_COS_INCOMPAT;
1341
1342                 fid_build_reg_res_name(mdt_object_fid(obj), res);
1343                 memset(policy, 0, sizeof(*policy));
1344                 policy->l_inodebits.bits = MDS_INODELOCK_LOOKUP;
1345                 rc = mdt_fid_lock(info->mti_env, info->mti_mdt->mdt_namespace,
1346                                   &lh->mlh_reg_lh, LCK_EX, policy, res,
1347                                   dlmflags, NULL);
1348         } else {
1349                 /* do nothing if both are local */
1350                 return 0;
1351         }
1352
1353         if (rc != ELDLM_OK)
1354                 return rc;
1355
1356         /*
1357          * TODO, currently we don't save this lock because there is no place to
1358          * hold this lock handle, but to avoid race we need to save this lock.
1359          */
1360         mdt_object_unlock(info, NULL, lh, 1);
1361
1362         return 0;
1363 }
1364
1365 /*
1366  * operation may takes locks of linkea, or directory stripes, group them in
1367  * different list.
1368  */
1369 struct mdt_sub_lock {
1370         struct mdt_object      *msl_obj;
1371         struct mdt_lock_handle  msl_lh;
1372         struct list_head        msl_linkage;
1373 };
1374
1375 static void mdt_unlock_list(struct mdt_thread_info *info,
1376                             struct list_head *list, int decref)
1377 {
1378         struct mdt_sub_lock *msl;
1379         struct mdt_sub_lock *tmp;
1380
1381         list_for_each_entry_safe(msl, tmp, list, msl_linkage) {
1382                 mdt_object_unlock_put(info, msl->msl_obj, &msl->msl_lh, decref);
1383                 list_del(&msl->msl_linkage);
1384                 OBD_FREE_PTR(msl);
1385         }
1386 }
1387
1388 static inline void mdt_migrate_object_unlock(struct mdt_thread_info *info,
1389                                              struct mdt_object *obj,
1390                                              struct mdt_lock_handle *lh,
1391                                              struct ldlm_enqueue_info *einfo,
1392                                              struct list_head *slave_locks,
1393                                              int decref)
1394 {
1395         if (mdt_object_remote(obj)) {
1396                 mdt_unlock_list(info, slave_locks, decref);
1397                 mdt_object_unlock(info, obj, lh, decref);
1398         } else {
1399                 mdt_reint_striped_unlock(info, obj, lh, einfo, decref);
1400         }
1401 }
1402
1403 /*
1404  * lock parents of links, and also check whether total locks don't exceed
1405  * RS_MAX_LOCKS.
1406  *
1407  * \retval      0 on success, and locks can be saved in ptlrpc_reply_stat
1408  * \retval      1 on success, but total lock count may exceed RS_MAX_LOCKS
1409  * \retval      -ev negative errno upon error
1410  */
1411 static int mdt_link_parents_lock(struct mdt_thread_info *info,
1412                                  struct mdt_object *pobj,
1413                                  const struct md_attr *ma,
1414                                  struct mdt_object *obj,
1415                                  struct mdt_lock_handle *lhp,
1416                                  struct ldlm_enqueue_info *peinfo,
1417                                  struct list_head *parent_slave_locks,
1418                                  struct list_head *link_locks)
1419 {
1420         struct mdt_device *mdt = info->mti_mdt;
1421         struct lu_buf *buf = &info->mti_big_buf;
1422         struct lu_name *lname = &info->mti_name;
1423         struct linkea_data ldata = { NULL };
1424         bool blocked = false;
1425         int local_lnkp_cnt = 0;
1426         int rc;
1427
1428         ENTRY;
1429
1430         if (S_ISDIR(lu_object_attr(&obj->mot_obj)))
1431                 RETURN(0);
1432
1433         buf = lu_buf_check_and_alloc(buf, MAX_LINKEA_SIZE);
1434         if (buf->lb_buf == NULL)
1435                 RETURN(-ENOMEM);
1436
1437         ldata.ld_buf = buf;
1438         rc = mdt_links_read(info, obj, &ldata);
1439         if (rc) {
1440                 if (rc == -ENOENT || rc == -ENODATA)
1441                         rc = 0;
1442                 RETURN(rc);
1443         }
1444
1445         for (linkea_first_entry(&ldata); ldata.ld_lee && !rc;
1446              linkea_next_entry(&ldata)) {
1447                 struct mdt_object *lnkp;
1448                 struct mdt_sub_lock *msl;
1449                 struct lu_fid fid;
1450                 __u64 ibits;
1451
1452                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, lname,
1453                                     &fid);
1454
1455                 /* check if it's also linked to parent */
1456                 if (lu_fid_eq(mdt_object_fid(pobj), &fid)) {
1457                         CDEBUG(D_INFO, "skip parent "DFID", reovke "DNAME"\n",
1458                                PFID(&fid), PNAME(lname));
1459                         /* in case link is remote object, revoke LOOKUP lock */
1460                         rc = mdt_revoke_remote_lookup_lock(info, pobj, obj);
1461                         continue;
1462                 }
1463
1464                 lnkp = NULL;
1465
1466                 /* check if it's linked to a stripe of parent */
1467                 if (ma->ma_valid & MA_LMV) {
1468                         struct lmv_mds_md_v1 *lmv = &ma->ma_lmv->lmv_md_v1;
1469                         struct lu_fid *stripe_fid = &info->mti_tmp_fid1;
1470                         int j = 0;
1471
1472                         for (; j < le32_to_cpu(lmv->lmv_stripe_count); j++) {
1473                                 fid_le_to_cpu(stripe_fid,
1474                                               &lmv->lmv_stripe_fids[j]);
1475                                 if (lu_fid_eq(stripe_fid, &fid)) {
1476                                         CDEBUG(D_INFO, "skip stripe "DFID
1477                                                ", reovke "DNAME"\n",
1478                                                PFID(&fid), PNAME(lname));
1479                                         lnkp = mdt_object_find(info->mti_env,
1480                                                                mdt, &fid);
1481                                         if (IS_ERR(lnkp))
1482                                                 GOTO(out, rc = PTR_ERR(lnkp));
1483                                         break;
1484                                 }
1485                         }
1486
1487                         if (lnkp) {
1488                                 rc = mdt_revoke_remote_lookup_lock(info, lnkp,
1489                                                                    obj);
1490                                 mdt_object_put(info->mti_env, lnkp);
1491                                 continue;
1492                         }
1493                 }
1494
1495                 /* Check if it's already locked */
1496                 list_for_each_entry(msl, link_locks, msl_linkage) {
1497                         if (lu_fid_eq(mdt_object_fid(msl->msl_obj), &fid)) {
1498                                 CDEBUG(D_INFO,
1499                                        DFID" was locked, revoke "DNAME"\n",
1500                                        PFID(&fid), PNAME(lname));
1501                                 lnkp = msl->msl_obj;
1502                                 break;
1503                         }
1504                 }
1505
1506                 if (lnkp) {
1507                         rc = mdt_revoke_remote_lookup_lock(info, lnkp, obj);
1508                         continue;
1509                 }
1510
1511                 CDEBUG(D_INFO, "lock "DFID":"DNAME"\n",
1512                        PFID(&fid), PNAME(lname));
1513
1514                 lnkp = mdt_object_find(info->mti_env, mdt, &fid);
1515                 if (IS_ERR(lnkp)) {
1516                         CWARN("%s: cannot find obj "DFID": %ld\n",
1517                               mdt_obd_name(mdt), PFID(&fid), PTR_ERR(lnkp));
1518                         continue;
1519                 }
1520
1521                 if (!mdt_object_exists(lnkp)) {
1522                         CDEBUG(D_INFO, DFID" doesn't exist, skip "DNAME"\n",
1523                               PFID(&fid), PNAME(lname));
1524                         mdt_object_put(info->mti_env, lnkp);
1525                         continue;
1526                 }
1527
1528                 if (!mdt_object_remote(lnkp))
1529                         local_lnkp_cnt++;
1530
1531                 OBD_ALLOC_PTR(msl);
1532                 if (msl == NULL)
1533                         GOTO(out, rc = -ENOMEM);
1534
1535                 /*
1536                  * we can't follow parent-child lock order like other MD
1537                  * operations, use lock_try here to avoid deadlock, if the lock
1538                  * cannot be taken, drop all locks taken, revoke the blocked
1539                  * one, and continue processing the remaining entries, and in
1540                  * the end of the loop restart from beginning.
1541                  */
1542                 mdt_lock_pdo_init(&msl->msl_lh, LCK_PW, lname);
1543                 ibits = 0;
1544                 rc = mdt_object_lock_try(info, lnkp, &msl->msl_lh, &ibits,
1545                                          MDS_INODELOCK_UPDATE, true);
1546                 if (!(ibits & MDS_INODELOCK_UPDATE)) {
1547
1548                         CDEBUG(D_INFO, "busy lock on "DFID" "DNAME"\n",
1549                                PFID(&fid), PNAME(lname));
1550
1551                         mdt_unlock_list(info, link_locks, 1);
1552                         /* also unlock parent locks to avoid deadlock */
1553                         if (!blocked)
1554                                 mdt_migrate_object_unlock(info, pobj, lhp,
1555                                                           peinfo,
1556                                                           parent_slave_locks,
1557                                                           1);
1558
1559                         blocked = true;
1560
1561                         mdt_lock_pdo_init(&msl->msl_lh, LCK_PW, lname);
1562                         rc = mdt_object_lock(info, lnkp, &msl->msl_lh,
1563                                              MDS_INODELOCK_UPDATE);
1564                         if (rc) {
1565                                 mdt_object_put(info->mti_env, lnkp);
1566                                 OBD_FREE_PTR(msl);
1567                                 GOTO(out, rc);
1568                         }
1569
1570                         if (mdt_object_remote(lnkp)) {
1571                                 struct ldlm_lock *lock;
1572
1573                                 /*
1574                                  * for remote object, set lock cb_atomic,
1575                                  * so lock can be released in blocking_ast()
1576                                  * immediately, then the next lock_try will
1577                                  * have better chance of success.
1578                                  */
1579                                 lock = ldlm_handle2lock(
1580                                                 &msl->msl_lh.mlh_rreg_lh);
1581                                 LASSERT(lock != NULL);
1582                                 lock_res_and_lock(lock);
1583                                 ldlm_set_atomic_cb(lock);
1584                                 unlock_res_and_lock(lock);
1585                                 LDLM_LOCK_PUT(lock);
1586                         }
1587
1588                         mdt_object_unlock_put(info, lnkp, &msl->msl_lh, 1);
1589                         OBD_FREE_PTR(msl);
1590                         continue;
1591                 }
1592
1593                 INIT_LIST_HEAD(&msl->msl_linkage);
1594                 msl->msl_obj = lnkp;
1595                 list_add_tail(&msl->msl_linkage, link_locks);
1596
1597                 rc = mdt_revoke_remote_lookup_lock(info, lnkp, obj);
1598         }
1599
1600         if (blocked)
1601                 GOTO(out, rc = -EBUSY);
1602
1603         EXIT;
1604 out:
1605         if (rc)
1606                 mdt_unlock_list(info, link_locks, rc);
1607         else if (local_lnkp_cnt > RS_MAX_LOCKS - 6)
1608                 /*
1609                  * parent may have 3 local objects: master object and 2 stripes
1610                  * (if it's being migrated too); source may have 2 local
1611                  * objects: master and 1 stripe; target has 1 local object.
1612                  */
1613                 rc = 1;
1614         return rc;
1615 }
1616
1617 static int mdt_lock_remote_slaves(struct mdt_thread_info *info,
1618                                   struct mdt_object *obj,
1619                                   const struct md_attr *ma,
1620                                   struct list_head *slave_locks)
1621 {
1622         struct mdt_device *mdt = info->mti_mdt;
1623         const struct lmv_mds_md_v1 *lmv = &ma->ma_lmv->lmv_md_v1;
1624         struct lu_fid *fid = &info->mti_tmp_fid1;
1625         struct mdt_object *slave;
1626         struct mdt_sub_lock *msl;
1627         int i;
1628         int rc;
1629
1630         ENTRY;
1631
1632         LASSERT(mdt_object_remote(obj));
1633         LASSERT(ma->ma_valid & MA_LMV);
1634         LASSERT(lmv);
1635
1636         if (le32_to_cpu(lmv->lmv_magic) != LMV_MAGIC_V1)
1637                 RETURN(-EINVAL);
1638
1639         if (le32_to_cpu(lmv->lmv_stripe_count) < 1)
1640                 RETURN(0);
1641
1642         for (i = 0; i < le32_to_cpu(lmv->lmv_stripe_count); i++) {
1643                 fid_le_to_cpu(fid, &lmv->lmv_stripe_fids[i]);
1644
1645                 if (!fid_is_sane(fid))
1646                         continue;
1647
1648                 slave = mdt_object_find(info->mti_env, mdt, fid);
1649                 if (IS_ERR(slave))
1650                         GOTO(out, rc = PTR_ERR(slave));
1651
1652                 OBD_ALLOC_PTR(msl);
1653                 if (!msl) {
1654                         mdt_object_put(info->mti_env, slave);
1655                         GOTO(out, rc = -ENOMEM);
1656                 }
1657
1658                 mdt_lock_reg_init(&msl->msl_lh, LCK_EX);
1659                 rc = mdt_reint_object_lock(info, slave, &msl->msl_lh,
1660                                            MDS_INODELOCK_UPDATE, true);
1661                 if (rc) {
1662                         OBD_FREE_PTR(msl);
1663                         mdt_object_put(info->mti_env, slave);
1664                         GOTO(out, rc);
1665                 }
1666
1667                 INIT_LIST_HEAD(&msl->msl_linkage);
1668                 msl->msl_obj = slave;
1669                 list_add_tail(&msl->msl_linkage, slave_locks);
1670         }
1671         EXIT;
1672
1673 out:
1674         if (rc)
1675                 mdt_unlock_list(info, slave_locks, rc);
1676         return rc;
1677 }
1678
1679 /* lock parent and its stripes */
1680 static int mdt_migrate_parent_lock(struct mdt_thread_info *info,
1681                                    struct mdt_object *obj,
1682                                    const struct md_attr *ma,
1683                                    struct mdt_lock_handle *lh,
1684                                    struct ldlm_enqueue_info *einfo,
1685                                    struct list_head *slave_locks)
1686 {
1687         int rc;
1688
1689         if (mdt_object_remote(obj)) {
1690                 rc = mdt_remote_object_lock(info, obj, mdt_object_fid(obj),
1691                                             &lh->mlh_rreg_lh, LCK_PW,
1692                                             MDS_INODELOCK_UPDATE, false);
1693                 if (rc != ELDLM_OK)
1694                         return rc;
1695
1696                 /*
1697                  * if obj is remote and striped, lock its stripes explicitly
1698                  * because it's not striped in LOD layer on this MDT.
1699                  */
1700                 if (ma->ma_valid & MA_LMV) {
1701                         rc = mdt_lock_remote_slaves(info, obj, ma, slave_locks);
1702                         if (rc)
1703                                 mdt_object_unlock(info, obj, lh, rc);
1704                 }
1705         } else {
1706                 rc = mdt_reint_striped_lock(info, obj, lh, MDS_INODELOCK_UPDATE,
1707                                             einfo, true);
1708         }
1709
1710         return rc;
1711 }
1712
1713 /*
1714  * in migration, object may be remote, and we need take full lock of it and its
1715  * stripes if it's directory, besides, object may be a remote object on its
1716  * parent, revoke its LOOKUP lock on where its parent is located.
1717  */
1718 static int mdt_migrate_object_lock(struct mdt_thread_info *info,
1719                                    struct mdt_object *pobj,
1720                                    struct mdt_object *obj,
1721                                    struct mdt_lock_handle *lh,
1722                                    struct ldlm_enqueue_info *einfo,
1723                                    struct list_head *slave_locks)
1724 {
1725         int rc;
1726
1727         if (mdt_object_remote(obj)) {
1728                 rc = mdt_revoke_remote_lookup_lock(info, pobj, obj);
1729                 if (rc)
1730                         return rc;
1731
1732                 rc = mdt_remote_object_lock(info, obj, mdt_object_fid(obj),
1733                                             &lh->mlh_rreg_lh, LCK_EX,
1734                                             MDS_INODELOCK_FULL, false);
1735                 if (rc != ELDLM_OK)
1736                         return rc;
1737
1738                 /*
1739                  * if obj is remote and striped, lock its stripes explicitly
1740                  * because it's not striped in LOD layer on this MDT.
1741                  */
1742                 if (S_ISDIR(lu_object_attr(&obj->mot_obj))) {
1743                         struct md_attr *ma = &info->mti_attr;
1744
1745                         ma->ma_lmv = info->mti_big_lmm;
1746                         ma->ma_lmv_size = info->mti_big_lmmsize;
1747                         ma->ma_valid = 0;
1748                         rc = mdt_stripe_get(info, obj, ma, XATTR_NAME_LMV);
1749                         if (rc) {
1750                                 mdt_object_unlock(info, obj, lh, rc);
1751                                 return rc;
1752                         }
1753
1754                         if (ma->ma_valid & MA_LMV) {
1755                                 rc = mdt_lock_remote_slaves(info, obj, ma,
1756                                                             slave_locks);
1757                                 if (rc)
1758                                         mdt_object_unlock(info, obj, lh, rc);
1759                         }
1760                 }
1761         } else {
1762                 if (mdt_object_remote(pobj)) {
1763                         rc = mdt_revoke_remote_lookup_lock(info, pobj, obj);
1764                         if (rc)
1765                                 return rc;
1766                 }
1767
1768                 rc = mdt_reint_striped_lock(info, obj, lh, MDS_INODELOCK_FULL,
1769                                             einfo, true);
1770         }
1771
1772         return rc;
1773 }
1774
1775 /*
1776  * lookup source by name, if parent is striped directory, we need to find the
1777  * corresponding stripe where source is located, and then lookup there.
1778  *
1779  * besides, if parent is migrating too, and file is already in target stripe,
1780  * this should be a redo of 'lfs migrate' on client side.
1781  */
1782 static int mdt_migrate_lookup(struct mdt_thread_info *info,
1783                               struct mdt_object *pobj,
1784                               const struct md_attr *ma,
1785                               const struct lu_name *lname,
1786                               struct mdt_object **spobj,
1787                               struct mdt_object **sobj)
1788 {
1789         const struct lu_env *env = info->mti_env;
1790         struct lu_fid *fid = &info->mti_tmp_fid1;
1791         struct mdt_object *stripe;
1792         int rc;
1793
1794         if (ma->ma_valid & MA_LMV) {
1795                 /* if parent is striped, lookup on corresponding stripe */
1796                 struct lmv_mds_md_v1 *lmv = &ma->ma_lmv->lmv_md_v1;
1797                 __u32 hash_type = le32_to_cpu(lmv->lmv_hash_type);
1798                 __u32 stripe_count = le32_to_cpu(lmv->lmv_stripe_count);
1799                 bool is_migrating = le32_to_cpu(lmv->lmv_hash_type) &
1800                                     LMV_HASH_FLAG_MIGRATION;
1801
1802                 if (is_migrating) {
1803                         hash_type = le32_to_cpu(lmv->lmv_migrate_hash);
1804                         stripe_count -= le32_to_cpu(lmv->lmv_migrate_offset);
1805                 }
1806
1807                 rc = lmv_name_to_stripe_index(hash_type, stripe_count,
1808                                               lname->ln_name,
1809                                               lname->ln_namelen);
1810                 if (rc < 0)
1811                         return rc;
1812
1813                 if (le32_to_cpu(lmv->lmv_hash_type) & LMV_HASH_FLAG_MIGRATION)
1814                         rc += le32_to_cpu(lmv->lmv_migrate_offset);
1815
1816                 fid_le_to_cpu(fid, &lmv->lmv_stripe_fids[rc]);
1817
1818                 stripe = mdt_object_find(env, info->mti_mdt, fid);
1819                 if (IS_ERR(stripe))
1820                         return PTR_ERR(stripe);
1821
1822                 fid_zero(fid);
1823                 rc = mdo_lookup(env, mdt_object_child(stripe), lname, fid,
1824                                 &info->mti_spec);
1825                 if (rc == -ENOENT && is_migrating) {
1826                         /*
1827                          * if parent is migrating, and lookup child failed on
1828                          * source stripe, lookup again on target stripe, if it
1829                          * exists, it means previous migration was interrupted,
1830                          * and current file was migrated already.
1831                          */
1832                         mdt_object_put(env, stripe);
1833
1834                         hash_type = le32_to_cpu(lmv->lmv_hash_type);
1835                         stripe_count = le32_to_cpu(lmv->lmv_migrate_offset);
1836
1837                         rc = lmv_name_to_stripe_index(hash_type, stripe_count,
1838                                                       lname->ln_name,
1839                                                       lname->ln_namelen);
1840                         if (rc < 0)
1841                                 return rc;
1842
1843                         fid_le_to_cpu(fid, &lmv->lmv_stripe_fids[rc]);
1844
1845                         stripe = mdt_object_find(env, info->mti_mdt, fid);
1846                         if (IS_ERR(stripe))
1847                                 return PTR_ERR(stripe);
1848
1849                         fid_zero(fid);
1850                         rc = mdo_lookup(env, mdt_object_child(stripe), lname,
1851                                         fid, &info->mti_spec);
1852                         mdt_object_put(env, stripe);
1853                         return rc ?: -EALREADY;
1854                 } else if (rc) {
1855                         mdt_object_put(env, stripe);
1856                         return rc;
1857                 }
1858         } else {
1859                 fid_zero(fid);
1860                 rc = mdo_lookup(env, mdt_object_child(pobj), lname, fid,
1861                                 &info->mti_spec);
1862                 if (rc)
1863                         return rc;
1864
1865                 stripe = pobj;
1866                 mdt_object_get(env, stripe);
1867         }
1868
1869         *spobj = stripe;
1870
1871         *sobj = mdt_object_find(env, info->mti_mdt, fid);
1872         if (IS_ERR(*sobj)) {
1873                 mdt_object_put(env, stripe);
1874                 rc = PTR_ERR(*sobj);
1875                 *spobj = NULL;
1876                 *sobj = NULL;
1877         }
1878
1879         return rc;
1880 }
1881
1882 /* end lease and close file for regular file */
1883 static int mdd_migrate_close(struct mdt_thread_info *info,
1884                              struct mdt_object *obj)
1885 {
1886         struct close_data *data;
1887         struct mdt_body *repbody;
1888         struct ldlm_lock *lease;
1889         int rc;
1890         int rc2;
1891
1892         rc = -EPROTO;
1893         if (!req_capsule_field_present(info->mti_pill, &RMF_MDT_EPOCH,
1894                                       RCL_CLIENT) ||
1895             !req_capsule_field_present(info->mti_pill, &RMF_CLOSE_DATA,
1896                                       RCL_CLIENT))
1897                 goto close;
1898
1899         data = req_capsule_client_get(info->mti_pill, &RMF_CLOSE_DATA);
1900         if (!data)
1901                 goto close;
1902
1903         rc = -ESTALE;
1904         lease = ldlm_handle2lock(&data->cd_handle);
1905         if (!lease)
1906                 goto close;
1907
1908         /* check if the lease was already canceled */
1909         lock_res_and_lock(lease);
1910         rc = ldlm_is_cancel(lease);
1911         unlock_res_and_lock(lease);
1912
1913         if (rc) {
1914                 rc = -EAGAIN;
1915                 LDLM_DEBUG(lease, DFID" lease broken",
1916                            PFID(mdt_object_fid(obj)));
1917         }
1918
1919         /*
1920          * cancel server side lease, client side counterpart should have been
1921          * cancelled, it's okay to cancel it now as we've held mot_open_sem.
1922          */
1923         ldlm_lock_cancel(lease);
1924         ldlm_reprocess_all(lease->l_resource);
1925         LDLM_LOCK_PUT(lease);
1926
1927 close:
1928         rc2 = mdt_close_internal(info, mdt_info_req(info), NULL);
1929         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1930         repbody->mbo_valid |= OBD_MD_CLOSE_INTENT_EXECED;
1931
1932         return rc ?: rc2;
1933 }
1934
1935 /*
1936  * migrate file in below steps:
1937  *  1. lock parent and its stripes
1938  *  2. lookup source by name
1939  *  3. lock parents of source links if source is not directory
1940  *  4. reject if source is in HSM
1941  *  5. take source open_sem and close file if source is regular file
1942  *  6. lock source and its stripes if it's directory
1943  *  7. lock target so subsequent change to it can trigger COS
1944  *  8. migrate file
1945  *  9. unlock above locks
1946  * 10. sync device if source has links
1947  */
1948 static int mdt_reint_migrate(struct mdt_thread_info *info,
1949                              struct mdt_lock_handle *unused)
1950 {
1951         const struct lu_env *env = info->mti_env;
1952         struct mdt_device *mdt = info->mti_mdt;
1953         struct ptlrpc_request *req = mdt_info_req(info);
1954         struct mdt_reint_record *rr = &info->mti_rr;
1955         struct lu_ucred *uc = mdt_ucred(info);
1956         struct md_attr *ma = &info->mti_attr;
1957         struct ldlm_enqueue_info *peinfo = &info->mti_einfo[0];
1958         struct ldlm_enqueue_info *seinfo = &info->mti_einfo[1];
1959         struct mdt_object *pobj;
1960         struct mdt_object *spobj = NULL;
1961         struct mdt_object *sobj = NULL;
1962         struct mdt_object *tobj;
1963         struct lustre_handle rename_lh = { 0 };
1964         struct mdt_lock_handle *lhp;
1965         struct mdt_lock_handle *lhs;
1966         struct mdt_lock_handle *lht;
1967         LIST_HEAD(parent_slave_locks);
1968         LIST_HEAD(child_slave_locks);
1969         LIST_HEAD(link_locks);
1970         int lock_retries = 5;
1971         bool open_sem_locked = false;
1972         bool do_sync = false;
1973         int rc;
1974         ENTRY;
1975
1976         CDEBUG(D_INODE, "migrate "DFID"/"DNAME" to "DFID"\n", PFID(rr->rr_fid1),
1977                PNAME(&rr->rr_name), PFID(rr->rr_fid2));
1978
1979         if (info->mti_dlm_req)
1980                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1981
1982         if (!fid_is_md_operative(rr->rr_fid1) ||
1983             !fid_is_md_operative(rr->rr_fid2))
1984                 RETURN(-EPERM);
1985
1986         /* don't allow migrate . or .. */
1987         if (lu_name_is_dot_or_dotdot(&rr->rr_name))
1988                 RETURN(-EBUSY);
1989
1990         if (!mdt->mdt_enable_remote_dir || !mdt->mdt_enable_dir_migration)
1991                 RETURN(-EPERM);
1992
1993         if (!md_capable(uc, CFS_CAP_SYS_ADMIN) &&
1994             uc->uc_gid != mdt->mdt_enable_remote_dir_gid &&
1995             mdt->mdt_enable_remote_dir_gid != -1)
1996                 RETURN(-EPERM);
1997
1998         /*
1999          * Note: do not enqueue rename lock for replay request, because
2000          * if other MDT holds rename lock, but being blocked to wait for
2001          * this MDT to finish its recovery, and the failover MDT can not
2002          * get rename lock, which will cause deadlock.
2003          */
2004         if (!req_is_replay(req)) {
2005                 rc = mdt_rename_lock(info, &rename_lh);
2006                 if (rc != 0) {
2007                         CERROR("%s: can't lock FS for rename: rc = %d\n",
2008                                mdt_obd_name(info->mti_mdt), rc);
2009                         RETURN(rc);
2010                 }
2011         }
2012
2013         /* pobj is master object of parent */
2014         pobj = mdt_parent_find_check(info, rr->rr_fid1, 0);
2015         if (IS_ERR(pobj))
2016                 GOTO(unlock_rename, rc = PTR_ERR(pobj));
2017
2018         if (unlikely(!info->mti_big_lmm)) {
2019                 info->mti_big_lmmsize = lmv_mds_md_size(64, LMV_MAGIC);
2020                 OBD_ALLOC(info->mti_big_lmm, info->mti_big_lmmsize);
2021                 if (!info->mti_big_lmm)
2022                         GOTO(put_parent, rc = -ENOMEM);
2023         }
2024
2025         ma->ma_lmv = info->mti_big_lmm;
2026         ma->ma_lmv_size = info->mti_big_lmmsize;
2027         ma->ma_valid = 0;
2028         rc = mdt_stripe_get(info, pobj, ma, XATTR_NAME_LMV);
2029         if (rc)
2030                 GOTO(put_parent, rc);
2031
2032 lock_parent:
2033         /* lock parent object */
2034         lhp = &info->mti_lh[MDT_LH_PARENT];
2035         mdt_lock_reg_init(lhp, LCK_PW);
2036         rc = mdt_migrate_parent_lock(info, pobj, ma, lhp, peinfo,
2037                                      &parent_slave_locks);
2038         if (rc)
2039                 GOTO(put_parent, rc);
2040
2041         /*
2042          * spobj is the corresponding stripe against name if pobj is striped
2043          * directory, which is the real parent, and no need to lock, because
2044          * we've taken full lock of pobj.
2045          */
2046         rc = mdt_migrate_lookup(info, pobj, ma, &rr->rr_name, &spobj, &sobj);
2047         if (rc)
2048                 GOTO(unlock_parent, rc);
2049
2050         /* lock parents of source links, and revoke LOOKUP lock of links */
2051         rc = mdt_link_parents_lock(info, pobj, ma, sobj, lhp, peinfo,
2052                                    &parent_slave_locks, &link_locks);
2053         if (rc == -EBUSY && lock_retries-- > 0) {
2054                 mdt_object_put(env, sobj);
2055                 mdt_object_put(env, spobj);
2056                 goto lock_parent;
2057         }
2058
2059         if (rc < 0)
2060                 GOTO(put_source, rc);
2061
2062         /*
2063          * RS_MAX_LOCKS is the limit of number of locks that can be saved along
2064          * with one request, if total lock count exceeds this limit, we will
2065          * drop all locks after migration, and synchronous device in the end.
2066          */
2067         do_sync = rc;
2068
2069         /* TODO: DoM migration is not supported yet */
2070         if (S_ISREG(lu_object_attr(&sobj->mot_obj))) {
2071                 ma->ma_lmm = info->mti_big_lmm;
2072                 ma->ma_lmm_size = info->mti_big_lmmsize;
2073                 ma->ma_valid = 0;
2074                 rc = mdt_stripe_get(info, sobj, ma, XATTR_NAME_LOV);
2075                 if (rc)
2076                         GOTO(put_source, rc);
2077
2078                 if (ma->ma_valid & MA_LOV &&
2079                     mdt_lmm_dom_entry(ma->ma_lmm) != LMM_NO_DOM)
2080                         GOTO(put_source, rc = -EOPNOTSUPP);
2081         }
2082
2083         /* if migration HSM is allowed */
2084         if (!mdt->mdt_opts.mo_migrate_hsm_allowed) {
2085                 ma->ma_need = MA_HSM;
2086                 ma->ma_valid = 0;
2087                 rc = mdt_attr_get_complex(info, sobj, ma);
2088                 if (rc)
2089                         GOTO(unlock_links, rc);
2090
2091                 if ((ma->ma_valid & MA_HSM) && ma->ma_hsm.mh_flags != 0)
2092                         GOTO(unlock_links, rc = -EOPNOTSUPP);
2093         }
2094
2095         /* end lease and close file for regular file */
2096         if (info->mti_spec.sp_migrate_close) {
2097                 /* try to hold open_sem so that nobody else can open the file */
2098                 if (!down_write_trylock(&sobj->mot_open_sem)) {
2099                         /* close anyway */
2100                         mdd_migrate_close(info, sobj);
2101                         GOTO(unlock_links, rc = -EBUSY);
2102                 } else {
2103                         open_sem_locked = true;
2104                         rc = mdd_migrate_close(info, sobj);
2105                         if (rc)
2106                                 GOTO(unlock_open_sem, rc);
2107                 }
2108         }
2109
2110         /* lock source */
2111         lhs = &info->mti_lh[MDT_LH_OLD];
2112         mdt_lock_reg_init(lhs, LCK_EX);
2113         rc = mdt_migrate_object_lock(info, spobj, sobj, lhs, seinfo,
2114                                      &child_slave_locks);
2115         if (rc)
2116                 GOTO(unlock_open_sem, rc);
2117
2118         /* lock target */
2119         tobj = mdt_object_find(env, mdt, rr->rr_fid2);
2120         if (IS_ERR(tobj))
2121                 GOTO(unlock_source, rc = PTR_ERR(tobj));
2122
2123         lht = &info->mti_lh[MDT_LH_NEW];
2124         mdt_lock_reg_init(lht, LCK_EX);
2125         rc = mdt_reint_object_lock(info, tobj, lht, MDS_INODELOCK_FULL, true);
2126         if (rc)
2127                 GOTO(put_target, rc);
2128
2129         /* Don't do lookup sanity check. We know name doesn't exist. */
2130         info->mti_spec.sp_cr_lookup = 0;
2131         info->mti_spec.sp_feat = &dt_directory_features;
2132
2133         rc = mdo_migrate(env, mdt_object_child(pobj),
2134                          mdt_object_child(sobj), &rr->rr_name,
2135                          mdt_object_child(tobj), &info->mti_spec, ma);
2136         EXIT;
2137
2138         mdt_object_unlock(info, tobj, lht, rc);
2139 put_target:
2140         mdt_object_put(env, tobj);
2141 unlock_source:
2142         mdt_migrate_object_unlock(info, sobj, lhs, seinfo,
2143                                   &child_slave_locks, rc);
2144 unlock_open_sem:
2145         if (open_sem_locked)
2146                 up_write(&sobj->mot_open_sem);
2147 unlock_links:
2148         mdt_unlock_list(info, &link_locks, do_sync ? 1 : rc);
2149 put_source:
2150         mdt_object_put(env, sobj);
2151         mdt_object_put(env, spobj);
2152 unlock_parent:
2153         mdt_migrate_object_unlock(info, pobj, lhp, peinfo,
2154                                   &parent_slave_locks, rc);
2155 put_parent:
2156         mdt_object_put(env, pobj);
2157 unlock_rename:
2158         if (lustre_handle_is_used(&rename_lh))
2159                 mdt_rename_unlock(&rename_lh);
2160
2161         if (!rc && do_sync)
2162                 mdt_device_sync(env, mdt);
2163
2164         return rc;
2165 }
2166
2167 static int mdt_object_lock_save(struct mdt_thread_info *info,
2168                                 struct mdt_object *dir,
2169                                 struct mdt_lock_handle *lh,
2170                                 int idx, bool cos_incompat)
2171 {
2172         int rc;
2173
2174         /* we lock the target dir if it is local */
2175         rc = mdt_reint_object_lock(info, dir, lh, MDS_INODELOCK_UPDATE,
2176                                    cos_incompat);
2177         if (rc != 0)
2178                 return rc;
2179
2180         /* get and save correct version after locking */
2181         mdt_version_get_save(info, dir, idx);
2182         return 0;
2183 }
2184
2185 /*
2186  * determine lock order of sobj and tobj
2187  *
2188  * there are two situations we need to lock tobj before sobj:
2189  * 1. sobj is child of tobj
2190  * 2. sobj and tobj are stripes of a directory, and stripe index of sobj is
2191  *    larger than that of tobj
2192  *
2193  * \retval      1 lock tobj before sobj
2194  * \retval      0 lock sobj before tobj
2195  * \retval      -ev negative errno upon error
2196  */
2197 static int mdt_rename_determine_lock_order(struct mdt_thread_info *info,
2198                                            struct mdt_object *sobj,
2199                                            struct mdt_object *tobj)
2200 {
2201         struct md_attr *ma = &info->mti_attr;
2202         struct lu_fid *spfid = &info->mti_tmp_fid1;
2203         struct lu_fid *tpfid = &info->mti_tmp_fid2;
2204         struct lmv_mds_md_v1 *lmv;
2205         __u32 sindex;
2206         __u32 tindex;
2207         int rc;
2208
2209         /* sobj and tobj are the same */
2210         if (sobj == tobj)
2211                 return 0;
2212
2213         if (fid_is_root(mdt_object_fid(sobj)))
2214                 return 0;
2215
2216         if (fid_is_root(mdt_object_fid(tobj)))
2217                 return 1;
2218
2219         /* check whether sobj is child of tobj */
2220         rc = mdo_is_subdir(info->mti_env, mdt_object_child(sobj),
2221                            mdt_object_fid(tobj));
2222         if (rc < 0)
2223                 return rc;
2224
2225         if (rc == 1)
2226                 return 1;
2227
2228         /* check whether sobj and tobj are children of the same parent */
2229         rc = mdt_attr_get_pfid(info, sobj, spfid);
2230         if (rc)
2231                 return rc;
2232
2233         rc = mdt_attr_get_pfid(info, tobj, tpfid);
2234         if (rc)
2235                 return rc;
2236
2237         if (!lu_fid_eq(spfid, tpfid))
2238                 return 0;
2239
2240         /* check whether sobj and tobj are sibling stripes */
2241         ma->ma_need = MA_LMV;
2242         ma->ma_valid = 0;
2243         ma->ma_lmv = (union lmv_mds_md *)info->mti_xattr_buf;
2244         ma->ma_lmv_size = sizeof(info->mti_xattr_buf);
2245         rc = mdt_stripe_get(info, sobj, ma, XATTR_NAME_LMV);
2246         if (rc)
2247                 return rc;
2248
2249         if (!(ma->ma_valid & MA_LMV))
2250                 return 0;
2251
2252         lmv = &ma->ma_lmv->lmv_md_v1;
2253         if (!(le32_to_cpu(lmv->lmv_magic) & LMV_MAGIC_STRIPE))
2254                 return 0;
2255         sindex = le32_to_cpu(lmv->lmv_master_mdt_index);
2256
2257         ma->ma_valid = 0;
2258         rc = mdt_stripe_get(info, tobj, ma, XATTR_NAME_LMV);
2259         if (rc)
2260                 return rc;
2261
2262         if (!(ma->ma_valid & MA_LMV))
2263                 return -ENODATA;
2264
2265         lmv = &ma->ma_lmv->lmv_md_v1;
2266         if (!(le32_to_cpu(lmv->lmv_magic) & LMV_MAGIC_STRIPE))
2267                 return -EINVAL;
2268         tindex = le32_to_cpu(lmv->lmv_master_mdt_index);
2269
2270         /* check stripe index of sobj and tobj */
2271         if (sindex == tindex)
2272                 return -EINVAL;
2273
2274         return sindex < tindex ? 0 : 1;
2275 }
2276
2277 /*
2278  * VBR: rename versions in reply: 0 - srcdir parent; 1 - tgtdir parent;
2279  * 2 - srcdir child; 3 - tgtdir child.
2280  * Update on disk version of srcdir child.
2281  */
2282 static int mdt_reint_rename(struct mdt_thread_info *info,
2283                             struct mdt_lock_handle *unused)
2284 {
2285         struct mdt_device *mdt = info->mti_mdt;
2286         struct mdt_reint_record *rr = &info->mti_rr;
2287         struct md_attr *ma = &info->mti_attr;
2288         struct ptlrpc_request *req = mdt_info_req(info);
2289         struct mdt_object *msrcdir = NULL;
2290         struct mdt_object *mtgtdir = NULL;
2291         struct mdt_object *mold;
2292         struct mdt_object *mnew = NULL;
2293         struct lustre_handle rename_lh = { 0 };
2294         struct mdt_lock_handle *lh_srcdirp;
2295         struct mdt_lock_handle *lh_tgtdirp;
2296         struct mdt_lock_handle *lh_oldp = NULL;
2297         struct mdt_lock_handle *lh_newp = NULL;
2298         struct lu_fid *old_fid = &info->mti_tmp_fid1;
2299         struct lu_fid *new_fid = &info->mti_tmp_fid2;
2300         __u64 lock_ibits;
2301         bool reverse = false, discard = false;
2302         bool cos_incompat;
2303         int rc;
2304         ENTRY;
2305
2306         DEBUG_REQ(D_INODE, req, "rename "DFID"/"DNAME" to "DFID"/"DNAME,
2307                   PFID(rr->rr_fid1), PNAME(&rr->rr_name),
2308                   PFID(rr->rr_fid2), PNAME(&rr->rr_tgt_name));
2309
2310         if (info->mti_dlm_req)
2311                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
2312
2313         if (!fid_is_md_operative(rr->rr_fid1) ||
2314             !fid_is_md_operative(rr->rr_fid2))
2315                 RETURN(-EPERM);
2316
2317         /* find both parents. */
2318         msrcdir = mdt_parent_find_check(info, rr->rr_fid1, 0);
2319         if (IS_ERR(msrcdir))
2320                 RETURN(PTR_ERR(msrcdir));
2321
2322         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME3, 5);
2323
2324         if (lu_fid_eq(rr->rr_fid1, rr->rr_fid2)) {
2325                 mtgtdir = msrcdir;
2326                 mdt_object_get(info->mti_env, mtgtdir);
2327         } else {
2328                 mtgtdir = mdt_parent_find_check(info, rr->rr_fid2, 1);
2329                 if (IS_ERR(mtgtdir))
2330                         GOTO(out_put_srcdir, rc = PTR_ERR(mtgtdir));
2331         }
2332
2333         /*
2334          * Note: do not enqueue rename lock for replay request, because
2335          * if other MDT holds rename lock, but being blocked to wait for
2336          * this MDT to finish its recovery, and the failover MDT can not
2337          * get rename lock, which will cause deadlock.
2338          */
2339         if (!req_is_replay(req)) {
2340                 /*
2341                  * Normally rename RPC is handled on the MDT with the target
2342                  * directory (if target exists, it's on the MDT with the
2343                  * target), if the source directory is remote, it's a hint that
2344                  * source is remote too (this may not be true, but it won't
2345                  * cause any issue), return -EXDEV early to avoid taking
2346                  * rename_lock.
2347                  */
2348                 if (!mdt->mdt_enable_remote_rename &&
2349                     mdt_object_remote(msrcdir))
2350                         GOTO(out_put_tgtdir, rc = -EXDEV);
2351
2352                 rc = mdt_rename_lock(info, &rename_lh);
2353                 if (rc != 0) {
2354                         CERROR("%s: can't lock FS for rename: rc = %d\n",
2355                                mdt_obd_name(mdt), rc);
2356                         GOTO(out_put_tgtdir, rc);
2357                 }
2358         }
2359
2360         rc = mdt_rename_determine_lock_order(info, msrcdir, mtgtdir);
2361         if (rc < 0)
2362                 GOTO(out_unlock_rename, rc);
2363
2364         reverse = rc;
2365
2366         /* source needs to be looked up after locking source parent, otherwise
2367          * this rename may race with unlink source, and cause rename hang, see
2368          * sanityn.sh 55b, so check parents first, if later we found source is
2369          * remote, relock parents. */
2370         cos_incompat = (mdt_object_remote(msrcdir) ||
2371                         mdt_object_remote(mtgtdir));
2372
2373         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME4, 5);
2374
2375         /* lock parents in the proper order. */
2376         lh_srcdirp = &info->mti_lh[MDT_LH_PARENT];
2377         lh_tgtdirp = &info->mti_lh[MDT_LH_CHILD];
2378
2379 relock:
2380         mdt_lock_pdo_init(lh_srcdirp, LCK_PW, &rr->rr_name);
2381         mdt_lock_pdo_init(lh_tgtdirp, LCK_PW, &rr->rr_tgt_name);
2382
2383         if (reverse) {
2384                 rc = mdt_object_lock_save(info, mtgtdir, lh_tgtdirp, 1,
2385                                           cos_incompat);
2386                 if (rc)
2387                         GOTO(out_unlock_rename, rc);
2388
2389                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME, 5);
2390
2391                 rc = mdt_object_lock_save(info, msrcdir, lh_srcdirp, 0,
2392                                           cos_incompat);
2393                 if (rc != 0) {
2394                         mdt_object_unlock(info, mtgtdir, lh_tgtdirp, rc);
2395                         GOTO(out_unlock_rename, rc);
2396                 }
2397         } else {
2398                 rc = mdt_object_lock_save(info, msrcdir, lh_srcdirp, 0,
2399                                           cos_incompat);
2400                 if (rc)
2401                         GOTO(out_unlock_rename, rc);
2402
2403                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME, 5);
2404
2405                 if (mtgtdir != msrcdir) {
2406                         rc = mdt_object_lock_save(info, mtgtdir, lh_tgtdirp, 1,
2407                                                   cos_incompat);
2408                 } else if (!mdt_object_remote(mtgtdir) &&
2409                            lh_srcdirp->mlh_pdo_hash !=
2410                            lh_tgtdirp->mlh_pdo_hash) {
2411                         rc = mdt_pdir_hash_lock(info, lh_tgtdirp, mtgtdir,
2412                                                 MDS_INODELOCK_UPDATE,
2413                                                 cos_incompat);
2414                         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK2, 10);
2415                 }
2416                 if (rc != 0) {
2417                         mdt_object_unlock(info, msrcdir, lh_srcdirp, rc);
2418                         GOTO(out_unlock_rename, rc);
2419                 }
2420         }
2421
2422         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME4, 5);
2423         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RENAME2, 5);
2424
2425         /* find mold object. */
2426         fid_zero(old_fid);
2427         rc = mdt_lookup_version_check(info, msrcdir, &rr->rr_name, old_fid, 2);
2428         if (rc != 0)
2429                 GOTO(out_unlock_parents, rc);
2430
2431         if (lu_fid_eq(old_fid, rr->rr_fid1) || lu_fid_eq(old_fid, rr->rr_fid2))
2432                 GOTO(out_unlock_parents, rc = -EINVAL);
2433
2434         if (!fid_is_md_operative(old_fid))
2435                 GOTO(out_unlock_parents, rc = -EPERM);
2436
2437         mold = mdt_object_find(info->mti_env, info->mti_mdt, old_fid);
2438         if (IS_ERR(mold))
2439                 GOTO(out_unlock_parents, rc = PTR_ERR(mold));
2440
2441         if (!mdt_object_exists(mold)) {
2442                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
2443                                 &mold->mot_obj,
2444                                 "object does not exist");
2445                 GOTO(out_put_old, rc = -ENOENT);
2446         }
2447
2448         if (mdt_object_remote(mold) && !mdt->mdt_enable_remote_rename)
2449                 GOTO(out_put_old, rc = -EXDEV);
2450
2451         /* Check if @mtgtdir is subdir of @mold, before locking child
2452          * to avoid reverse locking. */
2453         if (mtgtdir != msrcdir) {
2454                 rc = mdo_is_subdir(info->mti_env, mdt_object_child(mtgtdir),
2455                                    old_fid);
2456                 if (rc) {
2457                         if (rc == 1)
2458                                 rc = -EINVAL;
2459                         GOTO(out_put_old, rc);
2460                 }
2461         }
2462
2463         tgt_vbr_obj_set(info->mti_env, mdt_obj2dt(mold));
2464         /* save version after locking */
2465         mdt_version_get_save(info, mold, 2);
2466
2467         if (!cos_incompat && mdt_object_remote(mold)) {
2468                 cos_incompat = true;
2469                 mdt_object_put(info->mti_env, mold);
2470                 mdt_object_unlock(info, mtgtdir, lh_tgtdirp, -EAGAIN);
2471                 mdt_object_unlock(info, msrcdir, lh_srcdirp, -EAGAIN);
2472                 goto relock;
2473         }
2474
2475         /* find mnew object:
2476          * mnew target object may not exist now
2477          * lookup with version checking */
2478         fid_zero(new_fid);
2479         rc = mdt_lookup_version_check(info, mtgtdir, &rr->rr_tgt_name, new_fid,
2480                                       3);
2481         if (rc == 0) {
2482                 /* the new_fid should have been filled at this moment */
2483                 if (lu_fid_eq(old_fid, new_fid))
2484                         GOTO(out_put_old, rc);
2485
2486                 if (lu_fid_eq(new_fid, rr->rr_fid1) ||
2487                     lu_fid_eq(new_fid, rr->rr_fid2))
2488                         GOTO(out_put_old, rc = -EINVAL);
2489
2490                 if (!fid_is_md_operative(new_fid))
2491                         GOTO(out_put_old, rc = -EPERM);
2492
2493                 mnew = mdt_object_find(info->mti_env, info->mti_mdt, new_fid);
2494                 if (IS_ERR(mnew))
2495                         GOTO(out_put_old, rc = PTR_ERR(mnew));
2496
2497                 if (!mdt_object_exists(mnew)) {
2498                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
2499                                         &mnew->mot_obj,
2500                                         "object does not exist");
2501                         GOTO(out_put_new, rc = -ENOENT);
2502                 }
2503
2504                 if (mdt_object_remote(mnew)) {
2505                         struct mdt_body  *repbody;
2506
2507                         /* Always send rename req to the target child MDT */
2508                         repbody = req_capsule_server_get(info->mti_pill,
2509                                                          &RMF_MDT_BODY);
2510                         LASSERT(repbody != NULL);
2511                         repbody->mbo_fid1 = *new_fid;
2512                         repbody->mbo_valid |= (OBD_MD_FLID | OBD_MD_MDS);
2513                         GOTO(out_put_new, rc = -EXDEV);
2514                 }
2515                 /* Before locking the target dir, check we do not replace
2516                  * a dir with a non-dir, otherwise it may deadlock with
2517                  * link op which tries to create a link in this dir
2518                  * back to this non-dir. */
2519                 if (S_ISDIR(lu_object_attr(&mnew->mot_obj)) &&
2520                     !S_ISDIR(lu_object_attr(&mold->mot_obj)))
2521                         GOTO(out_put_new, rc = -EISDIR);
2522
2523                 lh_oldp = &info->mti_lh[MDT_LH_OLD];
2524                 mdt_lock_reg_init(lh_oldp, LCK_EX);
2525                 lock_ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_XATTR;
2526                 if (mdt_object_remote(msrcdir)) {
2527                         /* Enqueue lookup lock from the parent MDT */
2528                         rc = mdt_remote_object_lock(info, msrcdir,
2529                                                     mdt_object_fid(mold),
2530                                                     &lh_oldp->mlh_rreg_lh,
2531                                                     lh_oldp->mlh_rreg_mode,
2532                                                     MDS_INODELOCK_LOOKUP,
2533                                                     false);
2534                         if (rc != ELDLM_OK)
2535                                 GOTO(out_put_new, rc);
2536
2537                         lock_ibits &= ~MDS_INODELOCK_LOOKUP;
2538                 }
2539
2540                 rc = mdt_reint_object_lock(info, mold, lh_oldp, lock_ibits,
2541                                            cos_incompat);
2542                 if (rc != 0)
2543                         GOTO(out_unlock_old, rc);
2544
2545                 /* Check if @msrcdir is subdir of @mnew, before locking child
2546                  * to avoid reverse locking. */
2547                 if (mtgtdir != msrcdir) {
2548                         rc = mdo_is_subdir(info->mti_env,
2549                                            mdt_object_child(msrcdir), new_fid);
2550                         if (rc) {
2551                                 if (rc == 1)
2552                                         rc = -EINVAL;
2553                                 GOTO(out_unlock_old, rc);
2554                         }
2555                 }
2556
2557                 /* We used to acquire MDS_INODELOCK_FULL here but we
2558                  * can't do this now because a running HSM restore on
2559                  * the rename onto victim will hold the layout
2560                  * lock. See LU-4002. */
2561
2562                 lh_newp = &info->mti_lh[MDT_LH_NEW];
2563                 mdt_lock_reg_init(lh_newp, LCK_EX);
2564                 rc = mdt_reint_object_lock(info, mnew, lh_newp,
2565                                            MDS_INODELOCK_LOOKUP |
2566                                            MDS_INODELOCK_UPDATE,
2567                                            cos_incompat);
2568                 if (rc != 0)
2569                         GOTO(out_unlock_old, rc);
2570
2571                 /* get and save version after locking */
2572                 mdt_version_get_save(info, mnew, 3);
2573         } else if (rc != -EREMOTE && rc != -ENOENT) {
2574                 GOTO(out_put_old, rc);
2575         } else {
2576                 lh_oldp = &info->mti_lh[MDT_LH_OLD];
2577                 mdt_lock_reg_init(lh_oldp, LCK_EX);
2578                 lock_ibits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_XATTR;
2579                 if (mdt_object_remote(msrcdir)) {
2580                         /* Enqueue lookup lock from the parent MDT */
2581                         rc = mdt_remote_object_lock(info, msrcdir,
2582                                                     mdt_object_fid(mold),
2583                                                     &lh_oldp->mlh_rreg_lh,
2584                                                     lh_oldp->mlh_rreg_mode,
2585                                                     MDS_INODELOCK_LOOKUP,
2586                                                     false);
2587                         if (rc != ELDLM_OK)
2588                                 GOTO(out_put_old, rc);
2589
2590                         lock_ibits &= ~MDS_INODELOCK_LOOKUP;
2591                 }
2592
2593                 rc = mdt_reint_object_lock(info, mold, lh_oldp, lock_ibits,
2594                                            cos_incompat);
2595                 if (rc != 0)
2596                         GOTO(out_unlock_old, rc);
2597
2598                 mdt_enoent_version_save(info, 3);
2599         }
2600
2601         /* step 5: rename it */
2602         mdt_reint_init_ma(info, ma);
2603
2604         mdt_fail_write(info->mti_env, info->mti_mdt->mdt_bottom,
2605                        OBD_FAIL_MDS_REINT_RENAME_WRITE);
2606
2607         if (mnew != NULL)
2608                 mutex_lock(&mnew->mot_lov_mutex);
2609
2610         rc = mdo_rename(info->mti_env, mdt_object_child(msrcdir),
2611                         mdt_object_child(mtgtdir), old_fid, &rr->rr_name,
2612                         mnew != NULL ? mdt_object_child(mnew) : NULL,
2613                         &rr->rr_tgt_name, ma);
2614
2615         if (mnew != NULL)
2616                 mutex_unlock(&mnew->mot_lov_mutex);
2617
2618         /* handle last link of tgt object */
2619         if (rc == 0) {
2620                 mdt_counter_incr(req, LPROC_MDT_RENAME);
2621                 if (mnew) {
2622                         mdt_handle_last_unlink(info, mnew, ma);
2623                         discard = mdt_dom_check_for_discard(info, mnew);
2624                 }
2625                 mdt_rename_counter_tally(info, info->mti_mdt, req,
2626                                          msrcdir, mtgtdir);
2627         }
2628
2629         EXIT;
2630         if (mnew != NULL)
2631                 mdt_object_unlock(info, mnew, lh_newp, rc);
2632 out_unlock_old:
2633         mdt_object_unlock(info, mold, lh_oldp, rc);
2634 out_put_new:
2635         if (mnew && !discard)
2636                 mdt_object_put(info->mti_env, mnew);
2637 out_put_old:
2638         mdt_object_put(info->mti_env, mold);
2639 out_unlock_parents:
2640         mdt_object_unlock(info, mtgtdir, lh_tgtdirp, rc);
2641         mdt_object_unlock(info, msrcdir, lh_srcdirp, rc);
2642 out_unlock_rename:
2643         if (lustre_handle_is_used(&rename_lh))
2644                 mdt_rename_unlock(&rename_lh);
2645 out_put_tgtdir:
2646         mdt_object_put(info->mti_env, mtgtdir);
2647 out_put_srcdir:
2648         mdt_object_put(info->mti_env, msrcdir);
2649
2650         /* The DoM discard can be done right in the place above where it is
2651          * assigned, meanwhile it is done here after rename unlock due to
2652          * compatibility with old clients, for them the discard blocks
2653          * the main thread until completion. Check LU-11359 for details.
2654          */
2655         if (discard) {
2656                 mdt_dom_discard_data(info, mnew);
2657                 mdt_object_put(info->mti_env, mnew);
2658         }
2659         return rc;
2660 }
2661
2662 static int mdt_reint_resync(struct mdt_thread_info *info,
2663                             struct mdt_lock_handle *lhc)
2664 {
2665         struct mdt_reint_record *rr = &info->mti_rr;
2666         struct ptlrpc_request   *req = mdt_info_req(info);
2667         struct md_attr          *ma = &info->mti_attr;
2668         struct mdt_object       *mo;
2669         struct ldlm_lock        *lease;
2670         struct mdt_body         *repbody;
2671         struct md_layout_change  layout = { .mlc_mirror_id = rr->rr_mirror_id };
2672         bool                     lease_broken;
2673         int                      rc, rc2;
2674         ENTRY;
2675
2676         DEBUG_REQ(D_INODE, req, DFID": FLR file resync\n", PFID(rr->rr_fid1));
2677
2678         if (info->mti_dlm_req)
2679                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
2680
2681         mo = mdt_object_find(info->mti_env, info->mti_mdt, rr->rr_fid1);
2682         if (IS_ERR(mo))
2683                 GOTO(out, rc = PTR_ERR(mo));
2684
2685         if (!mdt_object_exists(mo))
2686                 GOTO(out_obj, rc = -ENOENT);
2687
2688         if (!S_ISREG(lu_object_attr(&mo->mot_obj)))
2689                 GOTO(out_obj, rc = -EINVAL);
2690
2691         if (mdt_object_remote(mo))
2692                 GOTO(out_obj, rc = -EREMOTE);
2693
2694         lease = ldlm_handle2lock(rr->rr_lease_handle);
2695         if (lease == NULL)
2696                 GOTO(out_obj, rc = -ESTALE);
2697
2698         /* It's really necessary to grab open_sem and check if the lease lock
2699          * has been lost. There would exist a concurrent writer coming in and
2700          * generating some dirty data in memory cache, the writeback would fail
2701          * after the layout version is increased by MDS_REINT_RESYNC RPC. */
2702         if (!down_write_trylock(&mo->mot_open_sem))
2703                 GOTO(out_put_lease, rc = -EBUSY);
2704
2705         lock_res_and_lock(lease);
2706         lease_broken = ldlm_is_cancel(lease);
2707         unlock_res_and_lock(lease);
2708         if (lease_broken)
2709                 GOTO(out_unlock, rc = -EBUSY);
2710
2711         /* the file has yet opened by anyone else after we took the lease. */
2712         layout.mlc_opc = MD_LAYOUT_RESYNC;
2713         rc = mdt_layout_change(info, mo, &layout);
2714         if (rc)
2715                 GOTO(out_unlock, rc);
2716
2717         ma->ma_need = MA_INODE;
2718         ma->ma_valid = 0;
2719         rc = mdt_attr_get_complex(info, mo, ma);
2720         if (rc != 0)
2721                 GOTO(out_unlock, rc);
2722
2723         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
2724         mdt_pack_attr2body(info, repbody, &ma->ma_attr, mdt_object_fid(mo));
2725
2726         EXIT;
2727 out_unlock:
2728         up_write(&mo->mot_open_sem);
2729 out_put_lease:
2730         LDLM_LOCK_PUT(lease);
2731 out_obj:
2732         mdt_object_put(info->mti_env, mo);
2733 out:
2734         mdt_client_compatibility(info);
2735         rc2 = mdt_fix_reply(info);
2736         if (rc == 0)
2737                 rc = rc2;
2738         return rc;
2739 }
2740
2741 struct mdt_reinter {
2742         int (*mr_handler)(struct mdt_thread_info *, struct mdt_lock_handle *);
2743         enum lprocfs_extra_opc mr_extra_opc;
2744 };
2745
2746 static const struct mdt_reinter mdt_reinters[] = {
2747         [REINT_SETATTR] = {
2748                 .mr_handler = &mdt_reint_setattr,
2749                 .mr_extra_opc = MDS_REINT_SETATTR,
2750         },
2751         [REINT_CREATE] = {
2752                 .mr_handler = &mdt_reint_create,
2753                 .mr_extra_opc = MDS_REINT_CREATE,
2754         },
2755         [REINT_LINK] = {
2756                 .mr_handler = &mdt_reint_link,
2757                 .mr_extra_opc = MDS_REINT_LINK,
2758         },
2759         [REINT_UNLINK] = {
2760                 .mr_handler = &mdt_reint_unlink,
2761                 .mr_extra_opc = MDS_REINT_UNLINK,
2762         },
2763         [REINT_RENAME] = {
2764                 .mr_handler = &mdt_reint_rename,
2765                 .mr_extra_opc = MDS_REINT_RENAME,
2766         },
2767         [REINT_OPEN] = {
2768                 .mr_handler = &mdt_reint_open,
2769                 .mr_extra_opc = MDS_REINT_OPEN,
2770         },
2771         [REINT_SETXATTR] = {
2772                 .mr_handler = &mdt_reint_setxattr,
2773                 .mr_extra_opc = MDS_REINT_SETXATTR,
2774         },
2775         [REINT_RMENTRY] = {
2776                 .mr_handler = &mdt_reint_unlink,
2777                 .mr_extra_opc = MDS_REINT_UNLINK,
2778         },
2779         [REINT_MIGRATE] = {
2780                 .mr_handler = &mdt_reint_migrate,
2781                 .mr_extra_opc = MDS_REINT_RENAME,
2782         },
2783         [REINT_RESYNC] = {
2784                 .mr_handler = &mdt_reint_resync,
2785                 .mr_extra_opc = MDS_REINT_RESYNC,
2786         },
2787 };
2788
2789 int mdt_reint_rec(struct mdt_thread_info *info,
2790                   struct mdt_lock_handle *lhc)
2791 {
2792         const struct mdt_reinter *mr;
2793         int rc;
2794         ENTRY;
2795
2796         if (!(info->mti_rr.rr_opcode < ARRAY_SIZE(mdt_reinters)))
2797                 RETURN(-EPROTO);
2798
2799         mr = &mdt_reinters[info->mti_rr.rr_opcode];
2800         if (mr->mr_handler == NULL)
2801                 RETURN(-EPROTO);
2802
2803         rc = (*mr->mr_handler)(info, lhc);
2804
2805         lprocfs_counter_incr(ptlrpc_req2svc(mdt_info_req(info))->srv_stats,
2806                              PTLRPC_LAST_CNTR + mr->mr_extra_opc);
2807
2808         RETURN(rc);
2809 }