lustre/mdt/mdt_handler.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) 2010, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/mdt/mdt_handler.c
  33  *
  34  * Lustre Metadata Target (mdt) request handler
  35  *
  36  * Author: Peter Braam <braam@clusterfs.com>
  37  * Author: Andreas Dilger <adilger@clusterfs.com>
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  * Author: Mike Shaver <shaver@clusterfs.com>
  40  * Author: Nikita Danilov <nikita@clusterfs.com>
  41  * Author: Huang Hua <huanghua@clusterfs.com>
  42  * Author: Yury Umanets <umka@clusterfs.com>
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_MDS
  46
  47 #include <linux/module.h>
  48 #include <linux/pagemap.h>
  49
  50 #include <dt_object.h>
  51 #include <lustre_acl.h>
  52 #include <lustre_export.h>
  53 #include <uapi/linux/lustre_ioctl.h>
  54 #include <lustre_lfsck.h>
  55 #include <lustre_log.h>
  56 #include <lustre_net.h>
  57 #include <lustre_nodemap.h>
  58 #include <lustre_mds.h>
  59 #include <lustre_param.h>
  60 #include <lustre_quota.h>
  61 #include <lustre_swab.h>
  62 #include <obd.h>
  63 #include <obd_support.h>
  64 #include <lustre_barrier.h>
  65
  66 #include <llog_swab.h>
  67
  68 #include "mdt_internal.h"
  69
  70
  71 static unsigned int max_mod_rpcs_per_client = 8;
  72 module_param(max_mod_rpcs_per_client, uint, 0644);
  73 MODULE_PARM_DESC(max_mod_rpcs_per_client, "maximum number of modify RPCs in flight allowed per client");
  74
  75 mdl_mode_t mdt_mdl_lock_modes[] = {
  76         [LCK_MINMODE] = MDL_MINMODE,
  77         [LCK_EX]      = MDL_EX,
  78         [LCK_PW]      = MDL_PW,
  79         [LCK_PR]      = MDL_PR,
  80         [LCK_CW]      = MDL_CW,
  81         [LCK_CR]      = MDL_CR,
  82         [LCK_NL]      = MDL_NL,
  83         [LCK_GROUP]   = MDL_GROUP
  84 };
  85
  86 enum ldlm_mode mdt_dlm_lock_modes[] = {
  87         [MDL_MINMODE]   = LCK_MINMODE,
  88         [MDL_EX]        = LCK_EX,
  89         [MDL_PW]        = LCK_PW,
  90         [MDL_PR]        = LCK_PR,
  91         [MDL_CW]        = LCK_CW,
  92         [MDL_CR]        = LCK_CR,
  93         [MDL_NL]        = LCK_NL,
  94         [MDL_GROUP]     = LCK_GROUP
  95 };
  96
  97 static struct mdt_device *mdt_dev(struct lu_device *d);
  98 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
  99
 100 static const struct lu_object_operations mdt_obj_ops;
 101
 102 /* Slab for MDT object allocation */
 103 static struct kmem_cache *mdt_object_kmem;
 104
 105 /* For HSM restore handles */
 106 struct kmem_cache *mdt_hsm_cdt_kmem;
 107
 108 /* For HSM request handles */
 109 struct kmem_cache *mdt_hsm_car_kmem;
 110
 111 static struct lu_kmem_descr mdt_caches[] = {
 112         {
 113                 .ckd_cache = &mdt_object_kmem,
 114                 .ckd_name  = "mdt_obj",
 115                 .ckd_size  = sizeof(struct mdt_object)
 116         },
 117         {
 118                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 119                 .ckd_name       = "mdt_cdt_restore_handle",
 120                 .ckd_size       = sizeof(struct cdt_restore_handle)
 121         },
 122         {
 123                 .ckd_cache      = &mdt_hsm_car_kmem,
 124                 .ckd_name       = "mdt_cdt_agent_req",
 125                 .ckd_size       = sizeof(struct cdt_agent_req)
 126         },
 127         {
 128                 .ckd_cache = NULL
 129         }
 130 };
 131
 132 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 133 {
 134         if (!rep)
 135                 return 0;
 136         return rep->lock_policy_res1 & op_flag;
 137 }
 138
 139 void mdt_clear_disposition(struct mdt_thread_info *info,
 140                            struct ldlm_reply *rep, __u64 op_flag)
 141 {
 142         if (info) {
 143                 info->mti_opdata &= ~op_flag;
 144                 tgt_opdata_clear(info->mti_env, op_flag);
 145         }
 146         if (rep)
 147                 rep->lock_policy_res1 &= ~op_flag;
 148 }
 149
 150 void mdt_set_disposition(struct mdt_thread_info *info,
 151                          struct ldlm_reply *rep, __u64 op_flag)
 152 {
 153         if (info) {
 154                 info->mti_opdata |= op_flag;
 155                 tgt_opdata_set(info->mti_env, op_flag);
 156         }
 157         if (rep)
 158                 rep->lock_policy_res1 |= op_flag;
 159 }
 160
 161 void mdt_lock_reg_init(struct mdt_lock_handle *lh, enum ldlm_mode lm)
 162 {
 163         lh->mlh_pdo_hash = 0;
 164         lh->mlh_reg_mode = lm;
 165         lh->mlh_rreg_mode = lm;
 166         lh->mlh_type = MDT_REG_LOCK;
 167 }
 168
 169 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, enum ldlm_mode lock_mode,
 170                        const struct lu_name *lname)
 171 {
 172         lh->mlh_reg_mode = lock_mode;
 173         lh->mlh_pdo_mode = LCK_MINMODE;
 174         lh->mlh_rreg_mode = lock_mode;
 175         lh->mlh_type = MDT_PDO_LOCK;
 176
 177         if (lu_name_is_valid(lname)) {
 178                 lh->mlh_pdo_hash = ll_full_name_hash(NULL, lname->ln_name,
 179                                                      lname->ln_namelen);
 180                 /* XXX Workaround for LU-2856
 181                  *
 182                  * Zero is a valid return value of full_name_hash, but
 183                  * several users of mlh_pdo_hash assume a non-zero
 184                  * hash value. We therefore map zero onto an
 185                  * arbitrary, but consistent value (1) to avoid
 186                  * problems further down the road. */
 187                 if (unlikely(lh->mlh_pdo_hash == 0))
 188                         lh->mlh_pdo_hash = 1;
 189         } else {
 190                 lh->mlh_pdo_hash = 0;
 191         }
 192 }
 193
 194 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 195                               struct mdt_lock_handle *lh)
 196 {
 197         mdl_mode_t mode;
 198         ENTRY;
 199
 200         /*
 201          * Any dir access needs couple of locks:
 202          *
 203          * 1) on part of dir we gonna take lookup/modify;
 204          *
 205          * 2) on whole dir to protect it from concurrent splitting and/or to
 206          * flush client's cache for readdir().
 207          *
 208          * so, for a given mode and object this routine decides what lock mode
 209          * to use for lock #2:
 210          *
 211          * 1) if caller's gonna lookup in dir then we need to protect dir from
 212          * being splitted only - LCK_CR
 213          *
 214          * 2) if caller's gonna modify dir then we need to protect dir from
 215          * being splitted and to flush cache - LCK_CW
 216          *
 217          * 3) if caller's gonna modify dir and that dir seems ready for
 218          * splitting then we need to protect it from any type of access
 219          * (lookup/modify/split) - LCK_EX --bzzz
 220          */
 221
 222         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 223         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 224
 225         /*
 226          * Ask underlaying level its opinion about preferable PDO lock mode
 227          * having access type passed as regular lock mode:
 228          *
 229          * - MDL_MINMODE means that lower layer does not want to specify lock
 230          * mode;
 231          *
 232          * - MDL_NL means that no PDO lock should be taken. This is used in some
 233          * cases. Say, for non-splittable directories no need to use PDO locks
 234          * at all.
 235          */
 236         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 237                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 238
 239         if (mode != MDL_MINMODE) {
 240                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 241         } else {
 242                 /*
 243                  * Lower layer does not want to specify locking mode. We do it
 244                  * our selves. No special protection is needed, just flush
 245                  * client's cache on modification and allow concurrent
 246                  * mondification.
 247                  */
 248                 switch (lh->mlh_reg_mode) {
 249                 case LCK_EX:
 250                         lh->mlh_pdo_mode = LCK_EX;
 251                         break;
 252                 case LCK_PR:
 253                         lh->mlh_pdo_mode = LCK_CR;
 254                         break;
 255                 case LCK_PW:
 256                         lh->mlh_pdo_mode = LCK_CW;
 257                         break;
 258                 default:
 259                         CERROR("Not expected lock type (0x%x)\n",
 260                                (int)lh->mlh_reg_mode);
 261                         LBUG();
 262                 }
 263         }
 264
 265         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 266         EXIT;
 267 }
 268
 269 static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
 270                               struct lu_fid *fid)
 271 {
 272         struct mdt_device *mdt = info->mti_mdt;
 273         struct lu_name *lname = &info->mti_name;
 274         char *name = NULL;
 275         struct mdt_object *parent;
 276         u32 mode;
 277         int rc = 0;
 278
 279         LASSERT(!info->mti_cross_ref);
 280
 281         OBD_ALLOC(name, NAME_MAX + 1);
 282         if (name == NULL)
 283                 return -ENOMEM;
 284         lname->ln_name = name;
 285
 286         /*
 287          * We may want to allow this to mount a completely separate
 288          * fileset from the MDT in the future, but keeping it to
 289          * ROOT/ only for now avoid potential security issues.
 290          */
 291         *fid = mdt->mdt_md_root_fid;
 292
 293         while (rc == 0 && fileset != NULL && *fileset != '\0') {
 294                 const char *s1 = fileset;
 295                 const char *s2;
 296
 297                 while (*++s1 == '/')
 298                         ;
 299                 s2 = s1;
 300                 while (*s2 != '/' && *s2 != '\0')
 301                         s2++;
 302
 303                 if (s2 == s1)
 304                         break;
 305
 306                 fileset = s2;
 307
 308                 lname->ln_namelen = s2 - s1;
 309                 if (lname->ln_namelen > NAME_MAX) {
 310                         rc = -EINVAL;
 311                         break;
 312                 }
 313
 314                 /* reject .. as a path component */
 315                 if (lname->ln_namelen == 2 &&
 316                     strncmp(s1, "..", 2) == 0) {
 317                         rc = -EINVAL;
 318                         break;
 319                 }
 320
 321                 strncpy(name, s1, lname->ln_namelen);
 322                 name[lname->ln_namelen] = '\0';
 323
 324                 parent = mdt_object_find(info->mti_env, mdt, fid);
 325                 if (IS_ERR(parent)) {
 326                         rc = PTR_ERR(parent);
 327                         break;
 328                 }
 329                 /* Only got the fid of this obj by name */
 330                 fid_zero(fid);
 331                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
 332                                 fid, &info->mti_spec);
 333                 mdt_object_put(info->mti_env, parent);
 334         }
 335         if (!rc) {
 336                 parent = mdt_object_find(info->mti_env, mdt, fid);
 337                 if (IS_ERR(parent))
 338                         rc = PTR_ERR(parent);
 339                 else {
 340                         mode = lu_object_attr(&parent->mot_obj);
 341                         mdt_object_put(info->mti_env, parent);
 342                         if (!S_ISDIR(mode))
 343                                 rc = -ENOTDIR;
 344                 }
 345         }
 346
 347         OBD_FREE(name, NAME_MAX + 1);
 348
 349         return rc;
 350 }
 351
 352 static int mdt_get_root(struct tgt_session_info *tsi)
 353 {
 354         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 355         struct mdt_device       *mdt = info->mti_mdt;
 356         struct mdt_body         *repbody;
 357         char                    *fileset = NULL, *buffer = NULL;
 358         int                      rc;
 359         struct obd_export       *exp = info->mti_exp;
 360         char                    *nodemap_fileset;
 361
 362         ENTRY;
 363
 364         rc = mdt_check_ucred(info);
 365         if (rc)
 366                 GOTO(out, rc = err_serious(rc));
 367
 368         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GET_ROOT_PACK))
 369                 GOTO(out, rc = err_serious(-ENOMEM));
 370
 371         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 372         if (req_capsule_get_size(info->mti_pill, &RMF_NAME, RCL_CLIENT) > 0) {
 373                 fileset = req_capsule_client_get(info->mti_pill, &RMF_NAME);
 374                 if (fileset == NULL)
 375                         GOTO(out, rc = err_serious(-EFAULT));
 376         }
 377
 378         nodemap_fileset = nodemap_get_fileset(exp->exp_target_data.ted_nodemap);
 379         if (nodemap_fileset && nodemap_fileset[0]) {
 380                 CDEBUG(D_INFO, "nodemap fileset is %s\n", nodemap_fileset);
 381                 if (fileset) {
 382                         /* consider fileset from client as a sub-fileset
 383                          * of the nodemap one */
 384                         OBD_ALLOC(buffer, PATH_MAX + 1);
 385                         if (buffer == NULL)
 386                                 GOTO(out, rc = err_serious(-ENOMEM));
 387                         if (snprintf(buffer, PATH_MAX + 1, "%s/%s",
 388                                      nodemap_fileset, fileset) >= PATH_MAX + 1)
 389                                 GOTO(out, rc = err_serious(-EINVAL));
 390                         fileset = buffer;
 391                 } else {
 392                         /* enforce fileset as specified in the nodemap */
 393                         fileset = nodemap_fileset;
 394                 }
 395         }
 396
 397         if (fileset) {
 398                 CDEBUG(D_INFO, "Getting fileset %s\n", fileset);
 399                 rc = mdt_lookup_fileset(info, fileset, &repbody->mbo_fid1);
 400                 if (rc < 0)
 401                         GOTO(out, rc = err_serious(rc));
 402         } else {
 403                 repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 404         }
 405         repbody->mbo_valid |= OBD_MD_FLID;
 406
 407         EXIT;
 408 out:
 409         mdt_thread_info_fini(info);
 410         if (buffer)
 411                 OBD_FREE(buffer, PATH_MAX+1);
 412         return rc;
 413 }
 414
 415 static int mdt_statfs(struct tgt_session_info *tsi)
 416 {
 417         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 418         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 419         struct md_device                *next = info->mti_mdt->mdt_child;
 420         struct ptlrpc_service_part      *svcpt;
 421         struct obd_statfs               *osfs;
 422         int                             rc;
 423
 424         ENTRY;
 425
 426         svcpt = req->rq_rqbd->rqbd_svcpt;
 427
 428         /* This will trigger a watchdog timeout */
 429         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 430                          (MDT_SERVICE_WATCHDOG_FACTOR *
 431                           at_get(&svcpt->scp_at_estimate)) + 1);
 432
 433         rc = mdt_check_ucred(info);
 434         if (rc)
 435                 GOTO(out, rc = err_serious(rc));
 436
 437         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 438                 GOTO(out, rc = err_serious(-ENOMEM));
 439
 440         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 441         if (!osfs)
 442                 GOTO(out, rc = -EPROTO);
 443
 444         /** statfs information are cached in the mdt_device */
 445         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 446                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 447                 /** statfs data is too old, get up-to-date one */
 448                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 449                 if (rc)
 450                         GOTO(out, rc);
 451                 spin_lock(&info->mti_mdt->mdt_lock);
 452                 info->mti_mdt->mdt_osfs = *osfs;
 453                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 454                 spin_unlock(&info->mti_mdt->mdt_lock);
 455         } else {
 456                 /** use cached statfs data */
 457                 spin_lock(&info->mti_mdt->mdt_lock);
 458                 *osfs = info->mti_mdt->mdt_osfs;
 459                 spin_unlock(&info->mti_mdt->mdt_lock);
 460         }
 461
 462         if (rc == 0)
 463                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 464 out:
 465         mdt_thread_info_fini(info);
 466         RETURN(rc);
 467 }
 468
 469 #ifdef CONFIG_FS_POSIX_ACL
 470 /*
 471  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 472  *
 473  * \param       info    thread info object
 474  * \param       repbody reply to pack ACLs into
 475  * \param       o       mdt object of file to examine
 476  * \param       nodemap nodemap of client to reply to
 477  * \retval      0       success
 478  * \retval      -errno  error getting or parsing ACL from disk
 479  */
 480 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 481                       struct mdt_object *o, struct lu_nodemap *nodemap)
 482 {
 483         const struct lu_env     *env = info->mti_env;
 484         struct md_object        *next = mdt_object_child(o);
 485         struct lu_buf           *buf = &info->mti_buf;
 486         int rc;
 487
 488         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 489         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 490                                            RCL_SERVER);
 491         if (buf->lb_len == 0)
 492                 return 0;
 493
 494         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 495         if (rc < 0) {
 496                 if (rc == -ENODATA) {
 497                         repbody->mbo_aclsize = 0;
 498                         repbody->mbo_valid |= OBD_MD_FLACL;
 499                         rc = 0;
 500                 } else if (rc == -EOPNOTSUPP) {
 501                         rc = 0;
 502                 } else {
 503                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 504                                mdt_obd_name(info->mti_mdt),
 505                                PFID(mdt_object_fid(o)), rc);
 506                 }
 507         } else {
 508                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 509                                      rc, NODEMAP_FS_TO_CLIENT);
 510                 /* if all ACLs mapped out, rc is still >= 0 */
 511                 if (rc < 0) {
 512                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 513                                " ACL: rc = %d\n", mdt_obd_name(info->mti_mdt),
 514                                PFID(mdt_object_fid(o)), rc);
 515                 } else {
 516                         repbody->mbo_aclsize = rc;
 517                         repbody->mbo_valid |= OBD_MD_FLACL;
 518                         rc = 0;
 519                 }
 520         }
 521         return rc;
 522 }
 523 #endif
 524
 525 /* XXX Look into layout in MDT layer. */
 526 static inline bool mdt_hsm_is_released(struct lov_mds_md *lmm)
 527 {
 528         struct lov_comp_md_v1   *comp_v1;
 529         struct lov_mds_md       *v1;
 530         int                      i;
 531
 532         if (lmm->lmm_magic == LOV_MAGIC_COMP_V1) {
 533                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
 534
 535                 for (i = 0; i < comp_v1->lcm_entry_count; i++) {
 536                         v1 = (struct lov_mds_md *)((char *)comp_v1 +
 537                                 comp_v1->lcm_entries[i].lcme_offset);
 538                         /* We don't support partial release for now */
 539                         if (!(v1->lmm_pattern & LOV_PATTERN_F_RELEASED))
 540                                 return false;
 541                 }
 542                 return true;
 543         } else {
 544                 return (lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) ?
 545                         true : false;
 546         }
 547 }
 548
 549 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 550                         const struct lu_attr *attr, const struct lu_fid *fid)
 551 {
 552         struct md_attr *ma = &info->mti_attr;
 553         struct obd_export *exp = info->mti_exp;
 554         struct lu_nodemap *nodemap = NULL;
 555
 556         LASSERT(ma->ma_valid & MA_INODE);
 557
 558         if (attr->la_valid & LA_ATIME) {
 559                 b->mbo_atime = attr->la_atime;
 560                 b->mbo_valid |= OBD_MD_FLATIME;
 561         }
 562         if (attr->la_valid & LA_MTIME) {
 563                 b->mbo_mtime = attr->la_mtime;
 564                 b->mbo_valid |= OBD_MD_FLMTIME;
 565         }
 566         if (attr->la_valid & LA_CTIME) {
 567                 b->mbo_ctime = attr->la_ctime;
 568                 b->mbo_valid |= OBD_MD_FLCTIME;
 569         }
 570         if (attr->la_valid & LA_FLAGS) {
 571                 b->mbo_flags = attr->la_flags;
 572                 b->mbo_valid |= OBD_MD_FLFLAGS;
 573         }
 574         if (attr->la_valid & LA_NLINK) {
 575                 b->mbo_nlink = attr->la_nlink;
 576                 b->mbo_valid |= OBD_MD_FLNLINK;
 577         }
 578         if (attr->la_valid & (LA_UID|LA_GID)) {
 579                 nodemap = nodemap_get_from_exp(exp);
 580                 if (IS_ERR(nodemap))
 581                         goto out;
 582         }
 583         if (attr->la_valid & LA_UID) {
 584                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 585                                             NODEMAP_FS_TO_CLIENT,
 586                                             attr->la_uid);
 587                 b->mbo_valid |= OBD_MD_FLUID;
 588         }
 589         if (attr->la_valid & LA_GID) {
 590                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 591                                             NODEMAP_FS_TO_CLIENT,
 592                                             attr->la_gid);
 593                 b->mbo_valid |= OBD_MD_FLGID;
 594         }
 595
 596         if (attr->la_valid & LA_PROJID) {
 597                 /* TODO, nodemap for project id */
 598                 b->mbo_projid = attr->la_projid;
 599                 b->mbo_valid |= OBD_MD_FLPROJID;
 600         }
 601
 602         b->mbo_mode = attr->la_mode;
 603         if (attr->la_valid & LA_MODE)
 604                 b->mbo_valid |= OBD_MD_FLMODE;
 605         if (attr->la_valid & LA_TYPE)
 606                 b->mbo_valid |= OBD_MD_FLTYPE;
 607
 608         if (fid != NULL) {
 609                 b->mbo_fid1 = *fid;
 610                 b->mbo_valid |= OBD_MD_FLID;
 611                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid=%#llx\n",
 612                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 613         }
 614
 615         if (!(attr->la_valid & LA_TYPE))
 616                 return;
 617
 618         b->mbo_rdev   = attr->la_rdev;
 619         b->mbo_size   = attr->la_size;
 620         b->mbo_blocks = attr->la_blocks;
 621
 622         if (!S_ISREG(attr->la_mode)) {
 623                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 624         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 625                 /* means no objects are allocated on osts. */
 626                 LASSERT(!(ma->ma_valid & MA_LOV));
 627                 /* just ignore blocks occupied by extend attributes on MDS */
 628                 b->mbo_blocks = 0;
 629                 /* if no object is allocated on osts, the size on mds is valid.
 630                  * b=22272 */
 631                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 632         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 633                    mdt_hsm_is_released(ma->ma_lmm)) {
 634                 /* A released file stores its size on MDS. */
 635                 /* But return 1 block for released file, unless tools like tar
 636                  * will consider it fully sparse. (LU-3864)
 637                  */
 638                 if (unlikely(b->mbo_size == 0))
 639                         b->mbo_blocks = 0;
 640                 else
 641                         b->mbo_blocks = 1;
 642                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 643         }
 644
 645         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 646                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 647                        PFID(fid), (unsigned long long)b->mbo_size);
 648
 649 out:
 650         if (!IS_ERR_OR_NULL(nodemap))
 651                 nodemap_putref(nodemap);
 652 }
 653
 654 static inline int mdt_body_has_lov(const struct lu_attr *la,
 655                                    const struct mdt_body *body)
 656 {
 657         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 658                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 659 }
 660
 661 void mdt_client_compatibility(struct mdt_thread_info *info)
 662 {
 663         struct mdt_body       *body;
 664         struct ptlrpc_request *req = mdt_info_req(info);
 665         struct obd_export     *exp = req->rq_export;
 666         struct md_attr        *ma = &info->mti_attr;
 667         struct lu_attr        *la = &ma->ma_attr;
 668         ENTRY;
 669
 670         if (exp_connect_layout(exp))
 671                 /* the client can deal with 16-bit lmm_stripe_count */
 672                 RETURN_EXIT;
 673
 674         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 675
 676         if (!mdt_body_has_lov(la, body))
 677                 RETURN_EXIT;
 678
 679         /* now we have a reply with a lov for a client not compatible with the
 680          * layout lock so we have to clean the layout generation number */
 681         if (S_ISREG(la->la_mode))
 682                 ma->ma_lmm->lmm_layout_gen = 0;
 683         EXIT;
 684 }
 685
 686 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 687                                    struct mdt_object *o)
 688 {
 689         const struct lu_env *env = info->mti_env;
 690         int rc, rc2;
 691
 692         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 693                           XATTR_NAME_LOV);
 694
 695         if (rc == -ENODATA)
 696                 rc = 0;
 697
 698         if (rc < 0)
 699                 goto out;
 700
 701         /* Is it a directory? Let's check for the LMV as well */
 702         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 703                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 704                                    XATTR_NAME_LMV);
 705
 706                 if (rc2 == -ENODATA)
 707                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 708                                            &LU_BUF_NULL,
 709                                            XATTR_NAME_DEFAULT_LMV);
 710
 711                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 712                         rc = rc2;
 713         }
 714
 715 out:
 716         return rc;
 717 }
 718
 719 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 720                       const char *name)
 721 {
 722         const struct lu_env *env = info->mti_env;
 723         int rc;
 724         ENTRY;
 725
 726         LASSERT(info->mti_big_lmm_used == 0);
 727         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 728         if (rc < 0)
 729                 RETURN(rc);
 730
 731         /* big_lmm may need to be grown */
 732         if (info->mti_big_lmmsize < rc) {
 733                 int size = size_roundup_power2(rc);
 734
 735                 if (info->mti_big_lmmsize > 0) {
 736                         /* free old buffer */
 737                         LASSERT(info->mti_big_lmm);
 738                         OBD_FREE_LARGE(info->mti_big_lmm,
 739                                        info->mti_big_lmmsize);
 740                         info->mti_big_lmm = NULL;
 741                         info->mti_big_lmmsize = 0;
 742                 }
 743
 744                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 745                 if (info->mti_big_lmm == NULL)
 746                         RETURN(-ENOMEM);
 747                 info->mti_big_lmmsize = size;
 748         }
 749         LASSERT(info->mti_big_lmmsize >= rc);
 750
 751         info->mti_buf.lb_buf = info->mti_big_lmm;
 752         info->mti_buf.lb_len = info->mti_big_lmmsize;
 753         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 754
 755         RETURN(rc);
 756 }
 757
 758 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 759                    struct md_attr *ma, const char *name)
 760 {
 761         struct md_object *next = mdt_object_child(o);
 762         struct lu_buf    *buf = &info->mti_buf;
 763         int rc;
 764
 765         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 766                 buf->lb_buf = ma->ma_lmm;
 767                 buf->lb_len = ma->ma_lmm_size;
 768                 LASSERT(!(ma->ma_valid & MA_LOV));
 769         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 770                 buf->lb_buf = ma->ma_lmv;
 771                 buf->lb_len = ma->ma_lmv_size;
 772                 LASSERT(!(ma->ma_valid & MA_LMV));
 773         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 774                 buf->lb_buf = ma->ma_lmv;
 775                 buf->lb_len = ma->ma_lmv_size;
 776                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 777         } else {
 778                 return -EINVAL;
 779         }
 780
 781         rc = mo_xattr_get(info->mti_env, next, buf, name);
 782         if (rc > 0) {
 783
 784 got:
 785                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 786                         if (info->mti_big_lmm_used)
 787                                 ma->ma_lmm = info->mti_big_lmm;
 788
 789                         /* NOT return LOV EA with hole to old client. */
 790                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 791                                      LOV_PATTERN_F_HOLE) &&
 792                             !(exp_connect_flags(info->mti_exp) &
 793                               OBD_CONNECT_LFSCK)) {
 794                                 return -EIO;
 795                         } else {
 796                                 ma->ma_lmm_size = rc;
 797                                 ma->ma_valid |= MA_LOV;
 798                         }
 799                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 800                         if (info->mti_big_lmm_used)
 801                                 ma->ma_lmv = info->mti_big_lmm;
 802
 803                         ma->ma_lmv_size = rc;
 804                         ma->ma_valid |= MA_LMV;
 805                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 806                         ma->ma_lmv_size = rc;
 807                         ma->ma_valid |= MA_LMV_DEF;
 808                 }
 809
 810                 /* Update mdt_max_mdsize so all clients will be aware that */
 811                 if (info->mti_mdt->mdt_max_mdsize < rc)
 812                         info->mti_mdt->mdt_max_mdsize = rc;
 813
 814                 rc = 0;
 815         } else if (rc == -ENODATA) {
 816                 /* no LOV EA */
 817                 rc = 0;
 818         } else if (rc == -ERANGE) {
 819                 /* Default LMV has fixed size, so it must be able to fit
 820                  * in the original buffer */
 821                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 822                         return rc;
 823                 rc = mdt_big_xattr_get(info, o, name);
 824                 if (rc > 0) {
 825                         info->mti_big_lmm_used = 1;
 826                         goto got;
 827                 }
 828         }
 829
 830         return rc;
 831 }
 832
 833 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 834                              struct mdt_object *o, struct lu_fid *pfid)
 835 {
 836         struct lu_buf           *buf = &info->mti_buf;
 837         struct link_ea_header   *leh;
 838         struct link_ea_entry    *lee;
 839         int                      rc;
 840         ENTRY;
 841
 842         buf->lb_buf = info->mti_big_lmm;
 843         buf->lb_len = info->mti_big_lmmsize;
 844         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 845                           buf, XATTR_NAME_LINK);
 846         /* ignore errors, MA_PFID won't be set and it is
 847          * up to the caller to treat this as an error */
 848         if (rc == -ERANGE || buf->lb_len == 0) {
 849                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 850                 buf->lb_buf = info->mti_big_lmm;
 851                 buf->lb_len = info->mti_big_lmmsize;
 852         }
 853
 854         if (rc < 0)
 855                 RETURN(rc);
 856         if (rc < sizeof(*leh)) {
 857                 CERROR("short LinkEA on "DFID": rc = %d\n",
 858                        PFID(mdt_object_fid(o)), rc);
 859                 RETURN(-ENODATA);
 860         }
 861
 862         leh = (struct link_ea_header *) buf->lb_buf;
 863         lee = (struct link_ea_entry *)(leh + 1);
 864         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 865                 leh->leh_magic = LINK_EA_MAGIC;
 866                 leh->leh_reccount = __swab32(leh->leh_reccount);
 867                 leh->leh_len = __swab64(leh->leh_len);
 868         }
 869         if (leh->leh_magic != LINK_EA_MAGIC)
 870                 RETURN(-EINVAL);
 871         if (leh->leh_reccount == 0)
 872                 RETURN(-ENODATA);
 873
 874         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 875         fid_be_to_cpu(pfid, pfid);
 876
 877         RETURN(0);
 878 }
 879
 880 int mdt_attr_get_complex(struct mdt_thread_info *info,
 881                          struct mdt_object *o, struct md_attr *ma)
 882 {
 883         const struct lu_env *env = info->mti_env;
 884         struct md_object    *next = mdt_object_child(o);
 885         struct lu_buf       *buf = &info->mti_buf;
 886         int                  need = ma->ma_need;
 887         int                  rc = 0, rc2;
 888         u32                  mode;
 889         ENTRY;
 890
 891         ma->ma_valid = 0;
 892
 893         if (mdt_object_exists(o) == 0)
 894                 GOTO(out, rc = -ENOENT);
 895         mode = lu_object_attr(&next->mo_lu);
 896
 897         if (need & MA_INODE) {
 898                 ma->ma_need = MA_INODE;
 899                 rc = mo_attr_get(env, next, ma);
 900                 if (rc)
 901                         GOTO(out, rc);
 902                 ma->ma_valid |= MA_INODE;
 903         }
 904
 905         if (need & MA_PFID) {
 906                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 907                 if (rc == 0)
 908                         ma->ma_valid |= MA_PFID;
 909                 /* ignore this error, parent fid is not mandatory */
 910                 rc = 0;
 911         }
 912
 913         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 914                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 915                 if (rc)
 916                         GOTO(out, rc);
 917         }
 918
 919         if (need & MA_LMV && S_ISDIR(mode)) {
 920                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 921                 if (rc != 0)
 922                         GOTO(out, rc);
 923         }
 924
 925         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 926                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 927                 if (rc != 0)
 928                         GOTO(out, rc);
 929         }
 930
 931         if (need & MA_HSM && S_ISREG(mode)) {
 932                 buf->lb_buf = info->mti_xattr_buf;
 933                 buf->lb_len = sizeof(info->mti_xattr_buf);
 934                 CLASSERT(sizeof(struct hsm_attrs) <=
 935                          sizeof(info->mti_xattr_buf));
 936                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 937                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 938                 if (rc2 == 0)
 939                         ma->ma_valid |= MA_HSM;
 940                 else if (rc2 < 0 && rc2 != -ENODATA)
 941                         GOTO(out, rc = rc2);
 942         }
 943
 944 #ifdef CONFIG_FS_POSIX_ACL
 945         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 946                 buf->lb_buf = ma->ma_acl;
 947                 buf->lb_len = ma->ma_acl_size;
 948                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 949                 if (rc2 > 0) {
 950                         ma->ma_acl_size = rc2;
 951                         ma->ma_valid |= MA_ACL_DEF;
 952                 } else if (rc2 == -ENODATA) {
 953                         /* no ACLs */
 954                         ma->ma_acl_size = 0;
 955                 } else
 956                         GOTO(out, rc = rc2);
 957         }
 958 #endif
 959 out:
 960         ma->ma_need = need;
 961         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = %#llx ma_lmm=%p\n",
 962                rc, ma->ma_valid, ma->ma_lmm);
 963         RETURN(rc);
 964 }
 965
 966 static int mdt_getattr_internal(struct mdt_thread_info *info,
 967                                 struct mdt_object *o, int ma_need)
 968 {
 969         struct md_object        *next = mdt_object_child(o);
 970         const struct mdt_body   *reqbody = info->mti_body;
 971         struct ptlrpc_request   *req = mdt_info_req(info);
 972         struct md_attr          *ma = &info->mti_attr;
 973         struct lu_attr          *la = &ma->ma_attr;
 974         struct req_capsule      *pill = info->mti_pill;
 975         const struct lu_env     *env = info->mti_env;
 976         struct mdt_body         *repbody;
 977         struct lu_buf           *buffer = &info->mti_buf;
 978         struct obd_export       *exp = info->mti_exp;
 979         int                      rc;
 980         ENTRY;
 981
 982         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 983                 RETURN(err_serious(-ENOMEM));
 984
 985         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 986
 987         ma->ma_valid = 0;
 988
 989         if (mdt_object_remote(o)) {
 990                 /* This object is located on remote node.*/
 991                 /* Return -ENOTSUPP for old client */
 992                 if (!mdt_is_dne_client(req->rq_export))
 993                         GOTO(out, rc = -ENOTSUPP);
 994
 995                 repbody->mbo_fid1 = *mdt_object_fid(o);
 996                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
 997                 GOTO(out, rc = 0);
 998         }
 999
1000         if (reqbody->mbo_eadatasize > 0) {
1001                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
1002                 if (buffer->lb_buf == NULL)
1003                         GOTO(out, rc = -EPROTO);
1004                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
1005                                                       RCL_SERVER);
1006         } else {
1007                 buffer->lb_buf = NULL;
1008                 buffer->lb_len = 0;
1009                 ma_need &= ~(MA_LOV | MA_LMV);
1010                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
1011                        mdt_obd_name(info->mti_mdt),
1012                        req->rq_export->exp_client_uuid.uuid);
1013         }
1014
1015         /* If it is dir object and client require MEA, then we got MEA */
1016         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1017             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
1018                 /* Assumption: MDT_MD size is enough for lmv size. */
1019                 ma->ma_lmv = buffer->lb_buf;
1020                 ma->ma_lmv_size = buffer->lb_len;
1021                 ma->ma_need = MA_INODE;
1022                 if (ma->ma_lmv_size > 0) {
1023                         if (reqbody->mbo_valid & OBD_MD_MEA)
1024                                 ma->ma_need |= MA_LMV;
1025                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
1026                                 ma->ma_need |= MA_LMV_DEF;
1027                 }
1028         } else {
1029                 ma->ma_lmm = buffer->lb_buf;
1030                 ma->ma_lmm_size = buffer->lb_len;
1031                 ma->ma_need = MA_INODE | MA_HSM;
1032                 if (ma->ma_lmm_size > 0)
1033                         ma->ma_need |= MA_LOV;
1034         }
1035
1036         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1037             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
1038             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
1039                 /* get default stripe info for this dir. */
1040                 ma->ma_need |= MA_LOV_DEF;
1041         }
1042         ma->ma_need |= ma_need;
1043
1044         rc = mdt_attr_get_complex(info, o, ma);
1045         if (unlikely(rc)) {
1046                 CDEBUG(rc == -ENOENT ? D_OTHER : D_ERROR,
1047                        "%s: getattr error for "DFID": rc = %d\n",
1048                        mdt_obd_name(info->mti_mdt),
1049                        PFID(mdt_object_fid(o)), rc);
1050                 RETURN(rc);
1051         }
1052
1053         /* if file is released, check if a restore is running */
1054         if (ma->ma_valid & MA_HSM) {
1055                 repbody->mbo_valid |= OBD_MD_TSTATE;
1056                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
1057                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
1058                         repbody->mbo_t_state = MS_RESTORE;
1059         }
1060
1061         if (likely(ma->ma_valid & MA_INODE))
1062                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
1063         else
1064                 RETURN(-EFAULT);
1065
1066         if (mdt_body_has_lov(la, reqbody)) {
1067                 if (ma->ma_valid & MA_LOV) {
1068                         LASSERT(ma->ma_lmm_size);
1069                         repbody->mbo_eadatasize = ma->ma_lmm_size;
1070                         if (S_ISDIR(la->la_mode))
1071                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
1072                         else
1073                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
1074                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
1075                 }
1076                 if (ma->ma_valid & MA_LMV) {
1077                         /* Return -ENOTSUPP for old client */
1078                         if (!mdt_is_striped_client(req->rq_export))
1079                                 RETURN(-ENOTSUPP);
1080
1081                         LASSERT(S_ISDIR(la->la_mode));
1082                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1083                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1084                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
1085                 }
1086                 if (ma->ma_valid & MA_LMV_DEF) {
1087                         /* Return -ENOTSUPP for old client */
1088                         if (!mdt_is_striped_client(req->rq_export))
1089                                 RETURN(-ENOTSUPP);
1090                         LASSERT(S_ISDIR(la->la_mode));
1091                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1092                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1093                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
1094                                                OBD_MD_DEFAULT_MEA);
1095                 }
1096         } else if (S_ISLNK(la->la_mode) &&
1097                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
1098                 buffer->lb_buf = ma->ma_lmm;
1099                 /* eadatasize from client includes NULL-terminator, so
1100                  * there is no need to read it */
1101                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
1102                 rc = mo_readlink(env, next, buffer);
1103                 if (unlikely(rc <= 0)) {
1104                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
1105                                mdt_obd_name(info->mti_mdt),
1106                                PFID(mdt_object_fid(o)), rc);
1107                         rc = -EFAULT;
1108                 } else {
1109                         int print_limit = min_t(int, PAGE_SIZE - 128, rc);
1110
1111                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
1112                                 rc -= 2;
1113                         repbody->mbo_valid |= OBD_MD_LINKNAME;
1114                         /* we need to report back size with NULL-terminator
1115                          * because client expects that */
1116                         repbody->mbo_eadatasize = rc + 1;
1117                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1118                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1119                                        "on "DFID ", expected %d\n",
1120                                        mdt_obd_name(info->mti_mdt),
1121                                        rc, PFID(mdt_object_fid(o)),
1122                                        reqbody->mbo_eadatasize - 1);
1123                         /* NULL terminate */
1124                         ((char *)ma->ma_lmm)[rc] = 0;
1125
1126                         /* If the total CDEBUG() size is larger than a page, it
1127                          * will print a warning to the console, avoid this by
1128                          * printing just the last part of the symlink. */
1129                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1130                                print_limit < rc ? "..." : "", print_limit,
1131                                (char *)ma->ma_lmm + rc - print_limit, rc);
1132                         rc = 0;
1133                 }
1134         }
1135
1136         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1137                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1138                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1139                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1140                        repbody->mbo_max_mdsize);
1141         }
1142
1143 #ifdef CONFIG_FS_POSIX_ACL
1144         if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1145                  (reqbody->mbo_valid & OBD_MD_FLACL)) {
1146                 struct lu_nodemap *nodemap = nodemap_get_from_exp(exp);
1147                 if (IS_ERR(nodemap))
1148                         RETURN(PTR_ERR(nodemap));
1149
1150                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1151                 nodemap_putref(nodemap);
1152         }
1153 #endif
1154
1155 out:
1156         if (rc == 0)
1157                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1158
1159         RETURN(rc);
1160 }
1161
1162 static int mdt_getattr(struct tgt_session_info *tsi)
1163 {
1164         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1165         struct mdt_object       *obj = info->mti_object;
1166         struct req_capsule      *pill = info->mti_pill;
1167         struct mdt_body         *reqbody;
1168         struct mdt_body         *repbody;
1169         int rc, rc2;
1170         ENTRY;
1171
1172         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1173         LASSERT(reqbody);
1174         LASSERT(obj != NULL);
1175         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1176
1177         /* Unlike intent case where we need to pre-fill out buffers early on
1178          * in intent policy for ldlm reasons, here we can have a much better
1179          * guess at EA size by just reading it from disk.
1180          * Exceptions are readdir and (missing) directory striping */
1181         /* Readlink */
1182         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1183                 /* No easy way to know how long is the symlink, but it cannot
1184                  * be more than PATH_MAX, so we allocate +1 */
1185                 rc = PATH_MAX + 1;
1186
1187         /* A special case for fs ROOT: getattr there might fetch
1188          * default EA for entire fs, not just for this dir!
1189          */
1190         } else if (lu_fid_eq(mdt_object_fid(obj),
1191                              &info->mti_mdt->mdt_md_root_fid) &&
1192                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1193                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1194                                                                  MDS_GETATTR)) {
1195                 /* Should the default strping be bigger, mdt_fix_reply
1196                  * will reallocate */
1197                 rc = DEF_REP_MD_SIZE;
1198         } else {
1199                 /* Read the actual EA size from disk */
1200                 rc = mdt_attr_get_eabuf_size(info, obj);
1201         }
1202
1203         if (rc < 0)
1204                 GOTO(out, rc = err_serious(rc));
1205
1206         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1207
1208         rc = req_capsule_server_pack(pill);
1209         if (unlikely(rc != 0))
1210                 GOTO(out, rc = err_serious(rc));
1211
1212         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1213         LASSERT(repbody != NULL);
1214         repbody->mbo_eadatasize = 0;
1215         repbody->mbo_aclsize = 0;
1216
1217         rc = mdt_check_ucred(info);
1218         if (unlikely(rc))
1219                 GOTO(out_shrink, rc);
1220
1221         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1222
1223         rc = mdt_getattr_internal(info, obj, 0);
1224         EXIT;
1225 out_shrink:
1226         mdt_client_compatibility(info);
1227         rc2 = mdt_fix_reply(info);
1228         if (rc == 0)
1229                 rc = rc2;
1230 out:
1231         mdt_thread_info_fini(info);
1232         return rc;
1233 }
1234
1235 /**
1236  * Handler of layout intent RPC requiring the layout modification
1237  *
1238  * \param[in] info      thread environment
1239  * \param[in] obj       object
1240  * \param[in] layout    layout intent
1241  * \param[in] buf       buffer containing client's lovea, could be empty
1242  *
1243  * \retval 0    on success
1244  * \retval < 0  error code
1245  */
1246 static int mdt_layout_change(struct mdt_thread_info *info,
1247                              struct mdt_object *obj,
1248                              struct layout_intent *layout,
1249                              const struct lu_buf *buf)
1250 {
1251         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LOCAL];
1252         int rc;
1253         ENTRY;
1254
1255         CDEBUG(D_INFO, "got layout change request from client: "
1256                "opc:%u flags:%#x extent[%#llx,%#llx)\n",
1257                layout->li_opc, layout->li_flags,
1258                layout->li_start, layout->li_end);
1259         if (layout->li_start >= layout->li_end) {
1260                 CERROR("Recieved an invalid layout change range [%llu, %llu) "
1261                        "for "DFID"\n", layout->li_start, layout->li_end,
1262                        PFID(mdt_object_fid(obj)));
1263                 RETURN(-EINVAL);
1264         }
1265
1266         if (!S_ISREG(lu_object_attr(&obj->mot_obj)))
1267                 GOTO(out, rc = -EINVAL);
1268
1269         rc = mo_permission(info->mti_env, NULL, mdt_object_child(obj), NULL,
1270                            MAY_WRITE);
1271         if (rc)
1272                 GOTO(out, rc);
1273
1274         /* take layout lock to prepare layout change */
1275         mdt_lock_reg_init(lh, LCK_EX);
1276         rc = mdt_object_lock(info, obj, lh,
1277                              MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR);
1278         if (rc)
1279                 GOTO(out, rc);
1280
1281         rc = mo_layout_change(info->mti_env, mdt_object_child(obj), layout,
1282                               buf);
1283
1284         mdt_object_unlock(info, obj, lh, 1);
1285 out:
1286         RETURN(rc);
1287 }
1288
1289 /**
1290  * Exchange MOF_LOV_CREATED flags between two objects after a
1291  * layout swap. No assumption is made on whether o1 or o2 have
1292  * created objects or not.
1293  *
1294  * \param[in,out] o1    First swap layout object
1295  * \param[in,out] o2    Second swap layout object
1296  */
1297 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1298 {
1299         unsigned int o1_lov_created = o1->mot_lov_created;
1300
1301         mutex_lock(&o1->mot_lov_mutex);
1302         mutex_lock(&o2->mot_lov_mutex);
1303
1304         o1->mot_lov_created = o2->mot_lov_created;
1305         o2->mot_lov_created = o1_lov_created;
1306
1307         mutex_unlock(&o2->mot_lov_mutex);
1308         mutex_unlock(&o1->mot_lov_mutex);
1309 }
1310
1311 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1312 {
1313         struct mdt_thread_info  *info;
1314         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1315         struct obd_export       *exp = req->rq_export;
1316         struct mdt_object       *o1, *o2, *o;
1317         struct mdt_lock_handle  *lh1, *lh2;
1318         struct mdc_swap_layouts *msl;
1319         int                      rc;
1320         ENTRY;
1321
1322         /* client does not support layout lock, so layout swaping
1323          * is disabled.
1324          * FIXME: there is a problem for old clients which don't support
1325          * layout lock yet. If those clients have already opened the file
1326          * they won't be notified at all so that old layout may still be
1327          * used to do IO. This can be fixed after file release is landed by
1328          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1329         if (!exp_connect_layout(exp))
1330                 RETURN(-EOPNOTSUPP);
1331
1332         info = tsi2mdt_info(tsi);
1333
1334         if (info->mti_dlm_req != NULL)
1335                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1336
1337         o1 = info->mti_object;
1338         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1339                                 &info->mti_body->mbo_fid2);
1340         if (IS_ERR(o))
1341                 GOTO(out, rc = PTR_ERR(o));
1342
1343         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1344                 GOTO(put, rc = -ENOENT);
1345
1346         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1347         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1348                 GOTO(put, rc);
1349
1350         if (rc < 0)
1351                 swap(o1, o2);
1352
1353         /* permission check. Make sure the calling process having permission
1354          * to write both files. */
1355         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1356                                 MAY_WRITE);
1357         if (rc < 0)
1358                 GOTO(put, rc);
1359
1360         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1361                                 MAY_WRITE);
1362         if (rc < 0)
1363                 GOTO(put, rc);
1364
1365         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1366         if (msl == NULL)
1367                 GOTO(put, rc = -EPROTO);
1368
1369         lh1 = &info->mti_lh[MDT_LH_NEW];
1370         mdt_lock_reg_init(lh1, LCK_EX);
1371         lh2 = &info->mti_lh[MDT_LH_OLD];
1372         mdt_lock_reg_init(lh2, LCK_EX);
1373
1374         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1375                              MDS_INODELOCK_XATTR);
1376         if (rc < 0)
1377                 GOTO(put, rc);
1378
1379         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1380                              MDS_INODELOCK_XATTR);
1381         if (rc < 0)
1382                 GOTO(unlock1, rc);
1383
1384         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1385                              mdt_object_child(o2), msl->msl_flags);
1386         if (rc < 0)
1387                 GOTO(unlock2, rc);
1388
1389         mdt_swap_lov_flag(o1, o2);
1390
1391 unlock2:
1392         mdt_object_unlock(info, o2, lh2, rc);
1393 unlock1:
1394         mdt_object_unlock(info, o1, lh1, rc);
1395 put:
1396         mdt_object_put(info->mti_env, o);
1397 out:
1398         mdt_thread_info_fini(info);
1399         RETURN(rc);
1400 }
1401
1402 static int mdt_raw_lookup(struct mdt_thread_info *info,
1403                           struct mdt_object *parent,
1404                           const struct lu_name *lname,
1405                           struct ldlm_reply *ldlm_rep)
1406 {
1407         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1408         int              rc;
1409         ENTRY;
1410
1411         LASSERT(!info->mti_cross_ref);
1412
1413         /* Only got the fid of this obj by name */
1414         fid_zero(child_fid);
1415         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1416                         lname, child_fid, &info->mti_spec);
1417         if (rc == 0) {
1418                 struct mdt_body *repbody;
1419
1420                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1421                 repbody->mbo_fid1 = *child_fid;
1422                 repbody->mbo_valid = OBD_MD_FLID;
1423                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1424         } else if (rc == -ENOENT) {
1425                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1426         }
1427
1428         RETURN(rc);
1429 }
1430
1431 /*
1432  * UPDATE lock should be taken against parent, and be released before exit;
1433  * child_bits lock should be taken against child, and be returned back:
1434  *            (1)normal request should release the child lock;
1435  *            (2)intent request will grant the lock to client.
1436  */
1437 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1438                                  struct mdt_lock_handle *lhc,
1439                                  __u64 child_bits,
1440                                  struct ldlm_reply *ldlm_rep)
1441 {
1442         struct ptlrpc_request  *req       = mdt_info_req(info);
1443         struct mdt_body        *reqbody   = NULL;
1444         struct mdt_object      *parent    = info->mti_object;
1445         struct mdt_object      *child;
1446         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1447         struct lu_name         *lname     = NULL;
1448         struct mdt_lock_handle *lhp       = NULL;
1449         struct ldlm_lock       *lock;
1450         bool                    is_resent;
1451         bool                    try_layout;
1452         int                     ma_need = 0;
1453         int                     rc;
1454         ENTRY;
1455
1456         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1457         LASSERT(ergo(is_resent,
1458                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1459
1460         if (parent == NULL)
1461                 RETURN(-ENOENT);
1462
1463         if (info->mti_cross_ref) {
1464                 /* Only getattr on the child. Parent is on another node. */
1465                 mdt_set_disposition(info, ldlm_rep,
1466                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1467                 child = parent;
1468                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1469                        "ldlm_rep = %p\n",
1470                        PFID(mdt_object_fid(child)), ldlm_rep);
1471
1472                 rc = mdt_check_resent_lock(info, child, lhc);
1473                 if (rc < 0) {
1474                         RETURN(rc);
1475                 } else if (rc > 0) {
1476                         mdt_lock_handle_init(lhc);
1477                         mdt_lock_reg_init(lhc, LCK_PR);
1478
1479                         /*
1480                          * Object's name is on another MDS, no lookup or layout
1481                          * lock is needed here but update lock is.
1482                          */
1483                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1484                                         MDS_INODELOCK_LAYOUT);
1485                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1486
1487                         rc = mdt_object_lock(info, child, lhc, child_bits);
1488                         if (rc < 0)
1489                                 RETURN(rc);
1490                 }
1491
1492                 /* Finally, we can get attr for child. */
1493                 if (!mdt_object_exists(child)) {
1494                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1495                                         &child->mot_obj,
1496                                         "remote object doesn't exist.");
1497                         mdt_object_unlock(info, child, lhc, 1);
1498                         RETURN(-ENOENT);
1499                 }
1500
1501                 rc = mdt_getattr_internal(info, child, 0);
1502                 if (unlikely(rc != 0))
1503                         mdt_object_unlock(info, child, lhc, 1);
1504
1505                 RETURN(rc);
1506         }
1507
1508         lname = &info->mti_name;
1509         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1510
1511         if (lu_name_is_valid(lname)) {
1512                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1513                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1514                        PNAME(lname), ldlm_rep);
1515         } else {
1516                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1517                 if (unlikely(reqbody == NULL))
1518                         RETURN(err_serious(-EPROTO));
1519
1520                 *child_fid = reqbody->mbo_fid2;
1521
1522                 if (unlikely(!fid_is_sane(child_fid)))
1523                         RETURN(err_serious(-EINVAL));
1524
1525                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1526                        "ldlm_rep = %p\n",
1527                        PFID(mdt_object_fid(parent)),
1528                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1529         }
1530
1531         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1532
1533         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1534                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1535                                 &parent->mot_obj,
1536                                 "Parent doesn't exist!");
1537                 RETURN(-ESTALE);
1538         }
1539
1540         if (mdt_object_remote(parent)) {
1541                 CERROR("%s: parent "DFID" is on remote target\n",
1542                        mdt_obd_name(info->mti_mdt),
1543                        PFID(mdt_object_fid(parent)));
1544                 RETURN(-EIO);
1545         }
1546
1547         if (lu_name_is_valid(lname)) {
1548                 /* Always allow to lookup ".." */
1549                 if (unlikely(lname->ln_namelen == 2 &&
1550                              lname->ln_name[0] == '.' &&
1551                              lname->ln_name[1] == '.'))
1552                         info->mti_spec.sp_permitted = 1;
1553
1554                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1555                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1556
1557                         RETURN(rc);
1558                 }
1559
1560                 /* step 1: lock parent only if parent is a directory */
1561                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1562                         lhp = &info->mti_lh[MDT_LH_PARENT];
1563                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1564                         rc = mdt_object_lock(info, parent, lhp,
1565                                              MDS_INODELOCK_UPDATE);
1566                         if (unlikely(rc != 0))
1567                                 RETURN(rc);
1568                 }
1569
1570                 /* step 2: lookup child's fid by name */
1571                 fid_zero(child_fid);
1572                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1573                                 child_fid, &info->mti_spec);
1574                 if (rc == -ENOENT)
1575                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1576
1577                 if (rc != 0)
1578                         GOTO(out_parent, rc);
1579         }
1580
1581         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1582
1583         /*
1584          *step 3: find the child object by fid & lock it.
1585          *        regardless if it is local or remote.
1586          *
1587          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1588          *      set parent dir fid the same as child fid in getattr by fid case
1589          *      we should not lu_object_find() the object again, could lead
1590          *      to hung if there is a concurrent unlink destroyed the object.
1591          */
1592         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1593                 mdt_object_get(info->mti_env, parent);
1594                 child = parent;
1595         } else {
1596                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1597                                         child_fid);
1598         }
1599
1600         if (unlikely(IS_ERR(child)))
1601                 GOTO(out_parent, rc = PTR_ERR(child));
1602
1603         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1604         if (!mdt_object_exists(child)) {
1605                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1606                                 &child->mot_obj,
1607                                 "Object doesn't exist!");
1608                 GOTO(out_child, rc = -ENOENT);
1609         }
1610
1611         rc = mdt_check_resent_lock(info, child, lhc);
1612         if (rc < 0) {
1613                 GOTO(out_child, rc);
1614         } else if (rc > 0) {
1615                 mdt_lock_handle_init(lhc);
1616                 mdt_lock_reg_init(lhc, LCK_PR);
1617                 try_layout = false;
1618
1619                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1620                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1621                         struct md_attr *ma = &info->mti_attr;
1622
1623                         ma->ma_valid = 0;
1624                         ma->ma_need = MA_INODE;
1625                         rc = mdt_attr_get_complex(info, child, ma);
1626                         if (unlikely(rc != 0))
1627                                 GOTO(out_child, rc);
1628
1629                         /* If the file has not been changed for some time, we
1630                          * return not only a LOOKUP lock, but also an UPDATE
1631                          * lock and this might save us RPC on later STAT. For
1632                          * directories, it also let negative dentry cache start
1633                          * working for this dir. */
1634                         if (ma->ma_valid & MA_INODE &&
1635                             ma->ma_attr.la_valid & LA_CTIME &&
1636                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1637                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1638                                 child_bits |= MDS_INODELOCK_UPDATE;
1639                 }
1640
1641                 /* layout lock must be granted in a best-effort way
1642                  * for IT operations */
1643                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1644                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1645                     exp_connect_layout(info->mti_exp) &&
1646                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1647                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1648                         /* try to grant layout lock for regular file. */
1649                         try_layout = true;
1650                 }
1651
1652                 rc = 0;
1653                 if (try_layout) {
1654                         child_bits |= MDS_INODELOCK_LAYOUT;
1655                         /* try layout lock, it may fail to be granted due to
1656                          * contention at LOOKUP or UPDATE */
1657                         if (!mdt_object_lock_try(info, child, lhc,
1658                                                  child_bits)) {
1659                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1660                                 LASSERT(child_bits != 0);
1661                                 rc = mdt_object_lock(info, child, lhc,
1662                                                      child_bits);
1663                         } else {
1664                                 ma_need |= MA_LOV;
1665                         }
1666                 } else {
1667                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1668                          * client will enqueue the lock to the remote MDT */
1669                         if (mdt_object_remote(child))
1670                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1671                         rc = mdt_object_lock(info, child, lhc, child_bits);
1672                 }
1673                 if (unlikely(rc != 0))
1674                         GOTO(out_child, rc);
1675         }
1676
1677         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1678
1679         /* finally, we can get attr for child. */
1680         rc = mdt_getattr_internal(info, child, ma_need);
1681         if (unlikely(rc != 0)) {
1682                 mdt_object_unlock(info, child, lhc, 1);
1683         } else if (lock) {
1684                 /* Debugging code. */
1685                 LDLM_DEBUG(lock, "Returning lock to client");
1686                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1687                                          &lock->l_resource->lr_name),
1688                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1689                          PLDLMRES(lock->l_resource),
1690                          PFID(mdt_object_fid(child)));
1691         }
1692         if (lock)
1693                 LDLM_LOCK_PUT(lock);
1694
1695         EXIT;
1696 out_child:
1697         mdt_object_put(info->mti_env, child);
1698 out_parent:
1699         if (lhp)
1700                 mdt_object_unlock(info, parent, lhp, 1);
1701         return rc;
1702 }
1703
1704 /* normal handler: should release the child lock */
1705 static int mdt_getattr_name(struct tgt_session_info *tsi)
1706 {
1707         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1708         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1709         struct mdt_body        *reqbody;
1710         struct mdt_body        *repbody;
1711         int rc, rc2;
1712         ENTRY;
1713
1714         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1715         LASSERT(reqbody != NULL);
1716         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1717         LASSERT(repbody != NULL);
1718
1719         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1720         repbody->mbo_eadatasize = 0;
1721         repbody->mbo_aclsize = 0;
1722
1723         rc = mdt_init_ucred_intent_getattr(info, reqbody);
1724         if (unlikely(rc))
1725                 GOTO(out_shrink, rc);
1726
1727         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1728         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1729                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1730                 lhc->mlh_reg_lh.cookie = 0;
1731         }
1732         mdt_exit_ucred(info);
1733         EXIT;
1734 out_shrink:
1735         mdt_client_compatibility(info);
1736         rc2 = mdt_fix_reply(info);
1737         if (rc == 0)
1738                 rc = rc2;
1739         mdt_thread_info_fini(info);
1740         return rc;
1741 }
1742
1743 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1744                          void *karg, void __user *uarg);
1745
1746 static int mdt_set_info(struct tgt_session_info *tsi)
1747 {
1748         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1749         char                    *key;
1750         void                    *val;
1751         int                      keylen, vallen, rc = 0;
1752
1753         ENTRY;
1754
1755         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1756         if (key == NULL) {
1757                 DEBUG_REQ(D_HA, req, "no set_info key");
1758                 RETURN(err_serious(-EFAULT));
1759         }
1760
1761         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1762                                       RCL_CLIENT);
1763
1764         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1765         if (val == NULL) {
1766                 DEBUG_REQ(D_HA, req, "no set_info val");
1767                 RETURN(err_serious(-EFAULT));
1768         }
1769
1770         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1771                                       RCL_CLIENT);
1772
1773         /* Swab any part of val you need to here */
1774         if (KEY_IS(KEY_READ_ONLY)) {
1775                 spin_lock(&req->rq_export->exp_lock);
1776                 if (*(__u32 *)val)
1777                         *exp_connect_flags_ptr(req->rq_export) |=
1778                                 OBD_CONNECT_RDONLY;
1779                 else
1780                         *exp_connect_flags_ptr(req->rq_export) &=
1781                                 ~OBD_CONNECT_RDONLY;
1782                 spin_unlock(&req->rq_export->exp_lock);
1783         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1784                 struct changelog_setinfo *cs = val;
1785
1786                 if (vallen != sizeof(*cs)) {
1787                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1788                                tgt_name(tsi->tsi_tgt), vallen);
1789                         RETURN(-EINVAL);
1790                 }
1791                 if (ptlrpc_req_need_swab(req)) {
1792                         __swab64s(&cs->cs_recno);
1793                         __swab32s(&cs->cs_id);
1794                 }
1795
1796                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1797                                    vallen, val, NULL);
1798         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
1799                 if (vallen > 0)
1800                         obd_export_evict_by_nid(req->rq_export->exp_obd, val);
1801         } else {
1802                 RETURN(-EINVAL);
1803         }
1804         RETURN(rc);
1805 }
1806
1807 static int mdt_readpage(struct tgt_session_info *tsi)
1808 {
1809         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1810         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1811         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1812         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1813         struct mdt_body         *repbody;
1814         int                      rc;
1815         int                      i;
1816
1817         ENTRY;
1818
1819         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1820                 RETURN(err_serious(-ENOMEM));
1821
1822         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1823         if (repbody == NULL || reqbody == NULL)
1824                 RETURN(err_serious(-EFAULT));
1825
1826         /*
1827          * prepare @rdpg before calling lower layers and transfer itself. Here
1828          * reqbody->size contains offset of where to start to read and
1829          * reqbody->nlink contains number bytes to read.
1830          */
1831         rdpg->rp_hash = reqbody->mbo_size;
1832         if (rdpg->rp_hash != reqbody->mbo_size) {
1833                 CERROR("Invalid hash: %#llx != %#llx\n",
1834                        rdpg->rp_hash, reqbody->mbo_size);
1835                 RETURN(-EFAULT);
1836         }
1837
1838         rdpg->rp_attrs = reqbody->mbo_mode;
1839         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1840                 rdpg->rp_attrs |= LUDA_64BITHASH;
1841         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1842                                 exp_max_brw_size(tsi->tsi_exp));
1843         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >>
1844                           PAGE_SHIFT;
1845         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1846         if (rdpg->rp_pages == NULL)
1847                 RETURN(-ENOMEM);
1848
1849         for (i = 0; i < rdpg->rp_npages; ++i) {
1850                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1851                 if (rdpg->rp_pages[i] == NULL)
1852                         GOTO(free_rdpg, rc = -ENOMEM);
1853         }
1854
1855         /* call lower layers to fill allocated pages with directory data */
1856         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1857         if (rc < 0)
1858                 GOTO(free_rdpg, rc);
1859
1860         /* send pages to client */
1861         rc = tgt_sendpage(tsi, rdpg, rc);
1862
1863         EXIT;
1864 free_rdpg:
1865
1866         for (i = 0; i < rdpg->rp_npages; i++)
1867                 if (rdpg->rp_pages[i] != NULL)
1868                         __free_page(rdpg->rp_pages[i]);
1869         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1870
1871         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1872                 RETURN(0);
1873
1874         return rc;
1875 }
1876
1877 static int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
1878 {
1879         struct lu_ucred *uc = mdt_ucred_check(info);
1880         struct lu_attr *attr = &info->mti_attr.ma_attr;
1881
1882         if (uc == NULL)
1883                 return -EINVAL;
1884
1885         if (op != REINT_SETATTR) {
1886                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
1887                         attr->la_uid = uc->uc_fsuid;
1888                 /* for S_ISGID, inherit gid from his parent, such work will be
1889                  * done in cmm/mdd layer, here set all cases as uc->uc_fsgid. */
1890                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
1891                         attr->la_gid = uc->uc_fsgid;
1892         }
1893
1894         return 0;
1895 }
1896
1897 static int mdt_reint_internal(struct mdt_thread_info *info,
1898                               struct mdt_lock_handle *lhc,
1899                               __u32 op)
1900 {
1901         struct req_capsule      *pill = info->mti_pill;
1902         struct mdt_body         *repbody;
1903         int                      rc = 0, rc2;
1904
1905         ENTRY;
1906
1907         rc = mdt_reint_unpack(info, op);
1908         if (rc != 0) {
1909                 CERROR("Can't unpack reint, rc %d\n", rc);
1910                 RETURN(err_serious(rc));
1911         }
1912
1913         /* for replay (no_create) lmm is not needed, client has it already */
1914         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1915                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1916                                      DEF_REP_MD_SIZE);
1917
1918         /* llog cookies are always 0, the field is kept for compatibility */
1919         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1920                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1921
1922         rc = req_capsule_server_pack(pill);
1923         if (rc != 0) {
1924                 CERROR("Can't pack response, rc %d\n", rc);
1925                 RETURN(err_serious(rc));
1926         }
1927
1928         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1929                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1930                 LASSERT(repbody);
1931                 repbody->mbo_eadatasize = 0;
1932                 repbody->mbo_aclsize = 0;
1933         }
1934
1935         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1936
1937         /* for replay no cookkie / lmm need, because client have this already */
1938         if (info->mti_spec.no_create)
1939                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1940                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1941
1942         rc = mdt_init_ucred_reint(info);
1943         if (rc)
1944                 GOTO(out_shrink, rc);
1945
1946         rc = mdt_fix_attr_ucred(info, op);
1947         if (rc != 0)
1948                 GOTO(out_ucred, rc = err_serious(rc));
1949
1950         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
1951         if (rc < 0) {
1952                 GOTO(out_ucred, rc);
1953         } else if (rc == 1) {
1954                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1955                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1956                 GOTO(out_ucred, rc);
1957         }
1958         rc = mdt_reint_rec(info, lhc);
1959         EXIT;
1960 out_ucred:
1961         mdt_exit_ucred(info);
1962 out_shrink:
1963         mdt_client_compatibility(info);
1964         rc2 = mdt_fix_reply(info);
1965         if (rc == 0)
1966                 rc = rc2;
1967         return rc;
1968 }
1969
1970 static long mdt_reint_opcode(struct ptlrpc_request *req,
1971                              const struct req_format **fmt)
1972 {
1973         struct mdt_device       *mdt;
1974         struct mdt_rec_reint    *rec;
1975         long                     opc;
1976
1977         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1978         if (rec != NULL) {
1979                 opc = rec->rr_opcode;
1980                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1981                 if (opc < REINT_MAX && fmt[opc] != NULL)
1982                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1983                 else {
1984                         mdt = mdt_exp2dev(req->rq_export);
1985                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1986                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1987                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1988                         opc = err_serious(-EFAULT);
1989                 }
1990         } else {
1991                 opc = err_serious(-EFAULT);
1992         }
1993         return opc;
1994 }
1995
1996 static int mdt_reint(struct tgt_session_info *tsi)
1997 {
1998         long opc;
1999         int  rc;
2000         static const struct req_format *reint_fmts[REINT_MAX] = {
2001                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
2002                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
2003                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
2004                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
2005                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
2006                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
2007                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
2008                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
2009                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
2010         };
2011
2012         ENTRY;
2013
2014         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
2015         if (opc >= 0) {
2016                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2017                 /*
2018                  * No lock possible here from client to pass it to reint code
2019                  * path.
2020                  */
2021                 rc = mdt_reint_internal(info, NULL, opc);
2022                 mdt_thread_info_fini(info);
2023         } else {
2024                 rc = opc;
2025         }
2026
2027         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
2028         RETURN(rc);
2029 }
2030
2031 /* this should sync the whole device */
2032 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
2033 {
2034         struct dt_device *dt = mdt->mdt_bottom;
2035         int rc;
2036         ENTRY;
2037
2038         rc = dt->dd_ops->dt_sync(env, dt);
2039         RETURN(rc);
2040 }
2041
2042 /* this should sync this object */
2043 static int mdt_object_sync(struct mdt_thread_info *info)
2044 {
2045         struct md_object *next;
2046         int rc;
2047         ENTRY;
2048
2049         if (!mdt_object_exists(info->mti_object)) {
2050                 CWARN("%s: non existing object "DFID": rc = %d\n",
2051                       mdt_obd_name(info->mti_mdt),
2052                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
2053                 RETURN(-ESTALE);
2054         }
2055         next = mdt_object_child(info->mti_object);
2056         rc = mo_object_sync(info->mti_env, next);
2057
2058         RETURN(rc);
2059 }
2060
2061 static int mdt_sync(struct tgt_session_info *tsi)
2062 {
2063         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2064         struct req_capsule      *pill = tsi->tsi_pill;
2065         struct mdt_body         *body;
2066         int                      rc;
2067
2068         ENTRY;
2069
2070         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
2071                 RETURN(err_serious(-ENOMEM));
2072
2073         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
2074                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
2075         } else {
2076                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2077
2078                 /* sync an object */
2079                 rc = mdt_object_sync(info);
2080                 if (rc == 0) {
2081                         const struct lu_fid *fid;
2082                         struct lu_attr *la = &info->mti_attr.ma_attr;
2083
2084                         info->mti_attr.ma_need = MA_INODE;
2085                         info->mti_attr.ma_valid = 0;
2086                         rc = mdt_attr_get_complex(info, info->mti_object,
2087                                                   &info->mti_attr);
2088                         if (rc == 0) {
2089                                 body = req_capsule_server_get(pill,
2090                                                               &RMF_MDT_BODY);
2091                                 fid = mdt_object_fid(info->mti_object);
2092                                 mdt_pack_attr2body(info, body, la, fid);
2093                         }
2094                 }
2095                 mdt_thread_info_fini(info);
2096         }
2097         if (rc == 0)
2098                 mdt_counter_incr(req, LPROC_MDT_SYNC);
2099
2100         RETURN(rc);
2101 }
2102
2103 /*
2104  * Handle quota control requests to consult current usage/limit, but also
2105  * to configure quota enforcement
2106  */
2107 static int mdt_quotactl(struct tgt_session_info *tsi)
2108 {
2109         struct obd_export       *exp  = tsi->tsi_exp;
2110         struct req_capsule      *pill = tsi->tsi_pill;
2111         struct obd_quotactl     *oqctl, *repoqc;
2112         int                      id, rc;
2113         struct mdt_device       *mdt = mdt_exp2dev(exp);
2114         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2115         struct lu_nodemap       *nodemap;
2116         ENTRY;
2117
2118         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2119         if (oqctl == NULL)
2120                 RETURN(err_serious(-EPROTO));
2121
2122         rc = req_capsule_server_pack(pill);
2123         if (rc)
2124                 RETURN(err_serious(rc));
2125
2126         nodemap = nodemap_get_from_exp(exp);
2127         if (IS_ERR(nodemap))
2128                 RETURN(PTR_ERR(nodemap));
2129
2130         switch (oqctl->qc_cmd) {
2131                 /* master quotactl */
2132         case Q_SETINFO:
2133         case Q_SETQUOTA:
2134                 if (!nodemap_can_setquota(nodemap))
2135                         GOTO(out_nodemap, rc = -EPERM);
2136         case Q_GETINFO:
2137         case Q_GETQUOTA:
2138                 if (qmt == NULL)
2139                         GOTO(out_nodemap, rc = -EOPNOTSUPP);
2140                 /* slave quotactl */
2141         case Q_GETOINFO:
2142         case Q_GETOQUOTA:
2143                 break;
2144         default:
2145                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2146                 GOTO(out_nodemap, rc = -EFAULT);
2147         }
2148
2149         id = oqctl->qc_id;
2150         switch (oqctl->qc_type) {
2151         case USRQUOTA:
2152                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2153                                     NODEMAP_CLIENT_TO_FS, id);
2154                 break;
2155         case GRPQUOTA:
2156                 id = nodemap_map_id(nodemap, NODEMAP_GID,
2157                                     NODEMAP_CLIENT_TO_FS, id);
2158                 break;
2159         case PRJQUOTA:
2160                 /* todo: check/map project id */
2161                 id = oqctl->qc_id;
2162                 break;
2163         default:
2164                 GOTO(out_nodemap, rc = -EOPNOTSUPP);
2165         }
2166         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2167         if (repoqc == NULL)
2168                 GOTO(out_nodemap, rc = err_serious(-EFAULT));
2169
2170         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA)
2171                 barrier_exit(tsi->tsi_tgt->lut_bottom);
2172
2173         if (oqctl->qc_id != id)
2174                 swap(oqctl->qc_id, id);
2175
2176         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA) {
2177                 if (unlikely(!barrier_entry(tsi->tsi_tgt->lut_bottom)))
2178                         RETURN(-EINPROGRESS);
2179         }
2180
2181         switch (oqctl->qc_cmd) {
2182
2183         case Q_GETINFO:
2184         case Q_SETINFO:
2185         case Q_SETQUOTA:
2186         case Q_GETQUOTA:
2187                 /* forward quotactl request to QMT */
2188                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2189                 break;
2190
2191         case Q_GETOINFO:
2192         case Q_GETOQUOTA:
2193                 /* slave quotactl */
2194                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2195                                    oqctl);
2196                 break;
2197
2198         default:
2199                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2200                 GOTO(out_nodemap, rc = -EFAULT);
2201         }
2202
2203         if (oqctl->qc_id != id)
2204                 swap(oqctl->qc_id, id);
2205
2206         *repoqc = *oqctl;
2207
2208         EXIT;
2209
2210 out_nodemap:
2211         nodemap_putref(nodemap);
2212
2213         return rc;
2214 }
2215
2216 /** clone llog ctxt from child (mdd)
2217  * This allows remote llog (replicator) access.
2218  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2219  * context was originally set up, or we can handle them directly.
2220  * I choose the latter, but that means I need any llog
2221  * contexts set up by child to be accessable by the mdt.  So we clone the
2222  * context into our context list here.
2223  */
2224 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2225                                int idx)
2226 {
2227         struct md_device  *next = mdt->mdt_child;
2228         struct llog_ctxt *ctxt;
2229         int rc;
2230
2231         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2232                 return 0;
2233
2234         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2235         if (rc || ctxt == NULL) {
2236                 return 0;
2237         }
2238
2239         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2240         if (rc)
2241                 CERROR("Can't set mdt ctxt %d\n", rc);
2242
2243         return rc;
2244 }
2245
2246 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2247                                  struct mdt_device *mdt, int idx)
2248 {
2249         struct llog_ctxt *ctxt;
2250
2251         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2252         if (ctxt == NULL)
2253                 return 0;
2254         /* Put once for the get we just did, and once for the clone */
2255         llog_ctxt_put(ctxt);
2256         llog_ctxt_put(ctxt);
2257         return 0;
2258 }
2259
2260 /*
2261  * sec context handlers
2262  */
2263 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2264 {
2265         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2266
2267         return 0;
2268 }
2269
2270 /*
2271  * quota request handlers
2272  */
2273 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2274 {
2275         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2276         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2277         int                      rc;
2278         ENTRY;
2279
2280         if (qmt == NULL)
2281                 RETURN(err_serious(-EOPNOTSUPP));
2282
2283         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2284         RETURN(rc);
2285 }
2286
2287 struct mdt_object *mdt_object_new(const struct lu_env *env,
2288                                   struct mdt_device *d,
2289                                   const struct lu_fid *f)
2290 {
2291         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2292         struct lu_object *o;
2293         struct mdt_object *m;
2294         ENTRY;
2295
2296         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2297         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2298         if (unlikely(IS_ERR(o)))
2299                 m = (struct mdt_object *)o;
2300         else
2301                 m = mdt_obj(o);
2302         RETURN(m);
2303 }
2304
2305 struct mdt_object *mdt_object_find(const struct lu_env *env,
2306                                    struct mdt_device *d,
2307                                    const struct lu_fid *f)
2308 {
2309         struct lu_object *o;
2310         struct mdt_object *m;
2311         ENTRY;
2312
2313         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2314         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2315         if (unlikely(IS_ERR(o)))
2316                 m = (struct mdt_object *)o;
2317         else
2318                 m = mdt_obj(o);
2319
2320         RETURN(m);
2321 }
2322
2323 /**
2324  * Asyncronous commit for mdt device.
2325  *
2326  * Pass asynchonous commit call down the MDS stack.
2327  *
2328  * \param env environment
2329  * \param mdt the mdt device
2330  */
2331 static void mdt_device_commit_async(const struct lu_env *env,
2332                                     struct mdt_device *mdt)
2333 {
2334         struct dt_device *dt = mdt->mdt_bottom;
2335         int rc;
2336         ENTRY;
2337
2338         rc = dt->dd_ops->dt_commit_async(env, dt);
2339         if (unlikely(rc != 0))
2340                 CWARN("%s: async commit start failed: rc = %d\n",
2341                       mdt_obd_name(mdt), rc);
2342         atomic_inc(&mdt->mdt_async_commit_count);
2343         EXIT;
2344 }
2345
2346 /**
2347  * Mark the lock as "synchonous".
2348  *
2349  * Mark the lock to deffer transaction commit to the unlock time.
2350  *
2351  * \param lock the lock to mark as "synchonous"
2352  *
2353  * \see mdt_is_lock_sync
2354  * \see mdt_save_lock
2355  */
2356 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2357 {
2358         lock->l_ast_data = (void*)1;
2359 }
2360
2361 /**
2362  * Check whehter the lock "synchonous" or not.
2363  *
2364  * \param lock the lock to check
2365  * \retval 1 the lock is "synchonous"
2366  * \retval 0 the lock isn't "synchronous"
2367  *
2368  * \see mdt_set_lock_sync
2369  * \see mdt_save_lock
2370  */
2371 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2372 {
2373         return lock->l_ast_data != NULL;
2374 }
2375
2376 /**
2377  * Blocking AST for mdt locks.
2378  *
2379  * Starts transaction commit if in case of COS lock conflict or
2380  * deffers such a commit to the mdt_save_lock.
2381  *
2382  * \param lock the lock which blocks a request or cancelling lock
2383  * \param desc unused
2384  * \param data unused
2385  * \param flag indicates whether this cancelling or blocking callback
2386  * \retval 0
2387  * \see ldlm_blocking_ast_nocheck
2388  */
2389 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2390                      void *data, int flag)
2391 {
2392         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2393         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2394         bool commit_async = false;
2395         int rc;
2396         ENTRY;
2397
2398         if (flag == LDLM_CB_CANCELING)
2399                 RETURN(0);
2400
2401         lock_res_and_lock(lock);
2402         if (lock->l_blocking_ast != mdt_blocking_ast) {
2403                 unlock_res_and_lock(lock);
2404                 RETURN(0);
2405         }
2406         /* There is no lock conflict if l_blocking_lock == NULL,
2407          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2408          * when the last reference to a local lock was released */
2409         if (lock->l_req_mode & (LCK_PW | LCK_EX) &&
2410             lock->l_blocking_lock != NULL) {
2411                 if (mdt_cos_is_enabled(mdt)) {
2412                         if (lock->l_client_cookie !=
2413                             lock->l_blocking_lock->l_client_cookie)
2414                                 mdt_set_lock_sync(lock);
2415                 } else if (mdt_slc_is_enabled(mdt) &&
2416                            ldlm_is_cos_incompat(lock->l_blocking_lock)) {
2417                         mdt_set_lock_sync(lock);
2418                         /*
2419                          * we may do extra commit here, but there is a small
2420                          * window to miss a commit: lock was unlocked (saved),
2421                          * then a conflict lock queued and we come here, but
2422                          * REP-ACK not received, so lock was not converted to
2423                          * COS mode yet.
2424                          * Fortunately this window is quite small, so the
2425                          * extra commit should be rare (not to say distributed
2426                          * operation is rare too).
2427                          */
2428                         commit_async = true;
2429                 }
2430         } else if (lock->l_req_mode == LCK_COS &&
2431                    lock->l_blocking_lock != NULL) {
2432                 commit_async = true;
2433         }
2434
2435         rc = ldlm_blocking_ast_nocheck(lock);
2436
2437         if (commit_async) {
2438                 struct lu_env env;
2439
2440                 rc = lu_env_init(&env, LCT_LOCAL);
2441                 if (unlikely(rc != 0))
2442                         CWARN("%s: lu_env initialization failed, cannot "
2443                               "start asynchronous commit: rc = %d\n",
2444                               obd->obd_name, rc);
2445                 else
2446                         mdt_device_commit_async(&env, mdt);
2447                 lu_env_fini(&env);
2448         }
2449         RETURN(rc);
2450 }
2451
2452 /*
2453  * Blocking AST for cross-MDT lock
2454  *
2455  * Discard lock from uncommitted_slc_locks and cancel it.
2456  *
2457  * \param lock  the lock which blocks a request or cancelling lock
2458  * \param desc  unused
2459  * \param data  unused
2460  * \param flag  indicates whether this cancelling or blocking callback
2461  * \retval      0 on success
2462  * \retval      negative number on error
2463  */
2464 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2465                             void *data, int flag)
2466 {
2467         int rc = 0;
2468         ENTRY;
2469
2470         switch (flag) {
2471         case LDLM_CB_BLOCKING: {
2472                 struct lustre_handle lockh;
2473
2474                 ldlm_lock2handle(lock, &lockh);
2475                 rc = ldlm_cli_cancel(&lockh,
2476                         ldlm_is_atomic_cb(lock) ? 0 : LCF_ASYNC);
2477                 if (rc < 0) {
2478                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2479                         RETURN(rc);
2480                 }
2481                 break;
2482         }
2483         case LDLM_CB_CANCELING: {
2484                 struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2485                 struct mdt_device *mdt =
2486                                 mdt_dev(obd->obd_lu_dev->ld_site->ls_top_dev);
2487
2488                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2489
2490                 /* discard slc lock here so that it can be cleaned anytime,
2491                  * especially for cleanup_resource() */
2492                 tgt_discard_slc_lock(&mdt->mdt_lut, lock);
2493
2494                 /* once we cache lock, l_ast_data is set to mdt_object */
2495                 if (lock->l_ast_data != NULL) {
2496                         struct mdt_object *mo = lock->l_ast_data;
2497                         struct lu_env env;
2498
2499                         rc = lu_env_init(&env, LCT_MD_THREAD);
2500                         if (unlikely(rc != 0)) {
2501                                 CWARN("%s: lu_env initialization failed, object"
2502                                       "%p "DFID" is leaked!\n",
2503                                       obd->obd_name, mo,
2504                                       PFID(mdt_object_fid(mo)));
2505                                 RETURN(rc);
2506                         }
2507
2508                         if (lock->l_policy_data.l_inodebits.bits &
2509                             (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)) {
2510                                 rc = mo_invalidate(&env, mdt_object_child(mo));
2511                                 mo->mot_cache_attr = 0;
2512                         }
2513                         mdt_object_put(&env, mo);
2514                         lu_env_fini(&env);
2515                 }
2516                 break;
2517         }
2518         default:
2519                 LBUG();
2520         }
2521
2522         RETURN(rc);
2523 }
2524
2525 int mdt_check_resent_lock(struct mdt_thread_info *info,
2526                           struct mdt_object *mo,
2527                           struct mdt_lock_handle *lhc)
2528 {
2529         /* the lock might already be gotten in ldlm_handle_enqueue() */
2530         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2531                 struct ptlrpc_request *req = mdt_info_req(info);
2532                 struct ldlm_lock      *lock;
2533
2534                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2535                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2536                 if (lock == NULL) {
2537                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2538                          * a resend case, however, it could be already destroyed
2539                          * due to client eviction or a raced cancel RPC. */
2540                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx",
2541                                           lhc->mlh_reg_lh.cookie);
2542                         RETURN(-ESTALE);
2543                 }
2544
2545                 if (!fid_res_name_eq(mdt_object_fid(mo),
2546                                      &lock->l_resource->lr_name)) {
2547                         CWARN("%s: Although resent, but still not "
2548                               "get child lock:"DFID"\n",
2549                               info->mti_exp->exp_obd->obd_name,
2550                               PFID(mdt_object_fid(mo)));
2551                         LDLM_LOCK_PUT(lock);
2552                         RETURN(-EPROTO);
2553                 }
2554                 LDLM_LOCK_PUT(lock);
2555                 return 0;
2556         }
2557         return 1;
2558 }
2559
2560 int mdt_remote_object_lock(struct mdt_thread_info *mti, struct mdt_object *o,
2561                            const struct lu_fid *fid, struct lustre_handle *lh,
2562                            enum ldlm_mode mode, __u64 ibits, bool nonblock,
2563                            bool cache)
2564 {
2565         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2566         union ldlm_policy_data *policy = &mti->mti_policy;
2567         struct ldlm_res_id *res_id = &mti->mti_res_id;
2568         int rc = 0;
2569         ENTRY;
2570
2571         LASSERT(mdt_object_remote(o));
2572
2573         fid_build_reg_res_name(fid, res_id);
2574
2575         memset(einfo, 0, sizeof(*einfo));
2576         einfo->ei_type = LDLM_IBITS;
2577         einfo->ei_mode = mode;
2578         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2579         einfo->ei_cb_cp = ldlm_completion_ast;
2580         einfo->ei_enq_slave = 0;
2581         einfo->ei_res_id = res_id;
2582         if (nonblock)
2583                 einfo->ei_nonblock = 1;
2584         if (cache) {
2585                 /*
2586                  * if we cache lock, couple lock with mdt_object, so that object
2587                  * can be easily found in lock ASTs.
2588                  */
2589                 mdt_object_get(mti->mti_env, o);
2590                 einfo->ei_cbdata = o;
2591         }
2592
2593         memset(policy, 0, sizeof(*policy));
2594         policy->l_inodebits.bits = ibits;
2595
2596         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2597                             policy);
2598         if (rc < 0 && cache) {
2599                 mdt_object_put(mti->mti_env, o);
2600                 einfo->ei_cbdata = NULL;
2601         }
2602         RETURN(rc);
2603 }
2604
2605 static int mdt_object_local_lock(struct mdt_thread_info *info,
2606                                  struct mdt_object *o,
2607                                  struct mdt_lock_handle *lh, __u64 ibits,
2608                                  bool nonblock, bool cos_incompat)
2609 {
2610         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2611         union ldlm_policy_data *policy = &info->mti_policy;
2612         struct ldlm_res_id *res_id = &info->mti_res_id;
2613         __u64 dlmflags = 0;
2614         int rc;
2615         ENTRY;
2616
2617         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2618         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2619         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2620         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2621
2622         if (cos_incompat) {
2623                 LASSERT(lh->mlh_reg_mode == LCK_PW ||
2624                         lh->mlh_reg_mode == LCK_EX);
2625                 dlmflags |= LDLM_FL_COS_INCOMPAT;
2626         } else if (mdt_cos_is_enabled(info->mti_mdt)) {
2627                 dlmflags |= LDLM_FL_COS_ENABLED;
2628         }
2629
2630         /* Only enqueue LOOKUP lock for remote object */
2631         if (mdt_object_remote(o))
2632                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2633
2634         if (lh->mlh_type == MDT_PDO_LOCK) {
2635                 /* check for exists after object is locked */
2636                 if (mdt_object_exists(o) == 0) {
2637                         /* Non-existent object shouldn't have PDO lock */
2638                         RETURN(-ESTALE);
2639                 } else {
2640                         /* Non-dir object shouldn't have PDO lock */
2641                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2642                                 RETURN(-ENOTDIR);
2643                 }
2644         }
2645
2646         memset(policy, 0, sizeof(*policy));
2647         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2648
2649         dlmflags |= LDLM_FL_ATOMIC_CB;
2650         if (nonblock)
2651                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2652
2653         /*
2654          * Take PDO lock on whole directory and build correct @res_id for lock
2655          * on part of directory.
2656          */
2657         if (lh->mlh_pdo_hash != 0) {
2658                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2659                 mdt_lock_pdo_mode(info, o, lh);
2660                 if (lh->mlh_pdo_mode != LCK_NL) {
2661                         /*
2662                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2663                          * is never going to be sent to client and we do not
2664                          * want it slowed down due to possible cancels.
2665                          */
2666                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2667                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2668                                           policy, res_id, dlmflags,
2669                                           info->mti_exp == NULL ? NULL :
2670                                           &info->mti_exp->exp_handle.h_cookie);
2671                         if (unlikely(rc != 0))
2672                                 GOTO(out_unlock, rc);
2673                 }
2674
2675                 /*
2676                  * Finish res_id initializing by name hash marking part of
2677                  * directory which is taking modification.
2678                  */
2679                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2680         }
2681
2682         policy->l_inodebits.bits = ibits;
2683
2684         /*
2685          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2686          * going to be sent to client. If it is - mdt_intent_policy() path will
2687          * fix it up and turn FL_LOCAL flag off.
2688          */
2689         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2690                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2691                           info->mti_exp == NULL ? NULL :
2692                           &info->mti_exp->exp_handle.h_cookie);
2693 out_unlock:
2694         if (rc != 0)
2695                 mdt_object_unlock(info, o, lh, 1);
2696         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2697                    lh->mlh_pdo_hash != 0 &&
2698                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2699                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2700
2701         RETURN(rc);
2702 }
2703
2704 static int
2705 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2706                          struct mdt_lock_handle *lh, __u64 ibits, bool nonblock,
2707                          bool cos_incompat)
2708 {
2709         struct mdt_lock_handle *local_lh = NULL;
2710         int rc;
2711         ENTRY;
2712
2713         if (!mdt_object_remote(o)) {
2714                 rc = mdt_object_local_lock(info, o, lh, ibits, nonblock,
2715                                            cos_incompat);
2716                 RETURN(rc);
2717         }
2718
2719         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2720         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2721                    MDS_INODELOCK_XATTR);
2722
2723         /* Only enqueue LOOKUP lock for remote object */
2724         if (ibits & MDS_INODELOCK_LOOKUP) {
2725                 rc = mdt_object_local_lock(info, o, lh, MDS_INODELOCK_LOOKUP,
2726                                            nonblock, cos_incompat);
2727                 if (rc != ELDLM_OK)
2728                         RETURN(rc);
2729
2730                 local_lh = lh;
2731         }
2732
2733         if (ibits & MDS_INODELOCK_UPDATE) {
2734                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2735                  * enqueue RPC can only request 1 lock, to avoid extra
2736                  * RPC, so it will instead enqueue EX lock for remote
2737                  * object anyway XXX*/
2738                 if (lh->mlh_type == MDT_PDO_LOCK &&
2739                     lh->mlh_pdo_hash != 0) {
2740                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2741                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2742                                PFID(mdt_object_fid(o)));
2743                         lh->mlh_pdo_hash = 0;
2744                         lh->mlh_rreg_mode = LCK_EX;
2745                         lh->mlh_type = MDT_REG_LOCK;
2746                 }
2747                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2748                                             &lh->mlh_rreg_lh,
2749                                             lh->mlh_rreg_mode,
2750                                             MDS_INODELOCK_UPDATE, nonblock,
2751                                             false);
2752                 if (rc != ELDLM_OK) {
2753                         if (local_lh != NULL)
2754                                 mdt_object_unlock(info, o, local_lh, rc);
2755                         RETURN(rc);
2756                 }
2757         }
2758
2759         RETURN(0);
2760 }
2761
2762 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2763                     struct mdt_lock_handle *lh, __u64 ibits)
2764 {
2765         return mdt_object_lock_internal(info, o, lh, ibits, false, false);
2766 }
2767
2768 int mdt_reint_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2769                           struct mdt_lock_handle *lh, __u64 ibits,
2770                           bool cos_incompat)
2771 {
2772         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2773         return mdt_object_lock_internal(info, o, lh, ibits, false,
2774                                         cos_incompat);
2775 }
2776
2777 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2778                         struct mdt_lock_handle *lh, __u64 ibits)
2779 {
2780         struct mdt_lock_handle tmp = *lh;
2781         int rc;
2782
2783         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, false);
2784         if (rc == 0)
2785                 *lh = tmp;
2786
2787         return rc == 0;
2788 }
2789
2790 int mdt_reint_object_lock_try(struct mdt_thread_info *info,
2791                               struct mdt_object *o, struct mdt_lock_handle *lh,
2792                               __u64 ibits, bool cos_incompat)
2793 {
2794         struct mdt_lock_handle tmp = *lh;
2795         int rc;
2796
2797         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2798         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, cos_incompat);
2799         if (rc == 0)
2800                 *lh = tmp;
2801
2802         return rc == 0;
2803 }
2804
2805 /**
2806  * Save a lock within request object.
2807  *
2808  * Keep the lock referenced until whether client ACK or transaction
2809  * commit happens or release the lock immediately depending on input
2810  * parameters. If COS is ON, a write lock is converted to COS lock
2811  * before saving.
2812  *
2813  * \param info thead info object
2814  * \param h lock handle
2815  * \param mode lock mode
2816  * \param decref force immediate lock releasing
2817  */
2818 static void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2819                           enum ldlm_mode mode, int decref)
2820 {
2821         ENTRY;
2822
2823         if (lustre_handle_is_used(h)) {
2824                 if (decref || !info->mti_has_trans ||
2825                     !(mode & (LCK_PW | LCK_EX))) {
2826                         mdt_fid_unlock(h, mode);
2827                 } else {
2828                         struct mdt_device *mdt = info->mti_mdt;
2829                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2830                         struct ptlrpc_request *req = mdt_info_req(info);
2831                         bool cos = mdt_cos_is_enabled(mdt);
2832                         bool convert_lock = !cos && mdt_slc_is_enabled(mdt);
2833
2834                         LASSERTF(lock != NULL, "no lock for cookie %#llx\n",
2835                                  h->cookie);
2836
2837                         /* there is no request if mdt_object_unlock() is called
2838                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2839                         if (likely(req != NULL)) {
2840                                 LDLM_DEBUG(lock, "save lock request %p reply "
2841                                         "state %p transno %lld\n", req,
2842                                         req->rq_reply_state, req->rq_transno);
2843                                 if (cos) {
2844                                         ldlm_lock_downgrade(lock, LCK_COS);
2845                                         mode = LCK_COS;
2846                                 }
2847                                 ptlrpc_save_lock(req, h, mode, cos,
2848                                                  convert_lock);
2849                         } else {
2850                                 mdt_fid_unlock(h, mode);
2851                         }
2852                         if (mdt_is_lock_sync(lock)) {
2853                                 CDEBUG(D_HA, "found sync-lock,"
2854                                        " async commit started\n");
2855                                 mdt_device_commit_async(info->mti_env,
2856                                                         mdt);
2857                         }
2858                         LDLM_LOCK_PUT(lock);
2859                 }
2860                 h->cookie = 0ull;
2861         }
2862
2863         EXIT;
2864 }
2865
2866 /**
2867  * Save cross-MDT lock in uncommitted_slc_locks
2868  *
2869  * Keep the lock referenced until transaction commit happens or release the lock
2870  * immediately depending on input parameters.
2871  *
2872  * \param info thead info object
2873  * \param h lock handle
2874  * \param mode lock mode
2875  * \param decref force immediate lock releasing
2876  */
2877 static void mdt_save_remote_lock(struct mdt_thread_info *info,
2878                                  struct mdt_object *o, struct lustre_handle *h,
2879                                  enum ldlm_mode mode, int decref)
2880 {
2881         ENTRY;
2882
2883         if (lustre_handle_is_used(h)) {
2884                 struct ldlm_lock *lock = ldlm_handle2lock(h);
2885
2886                 if (o != NULL &&
2887                     (lock->l_policy_data.l_inodebits.bits &
2888                      (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)))
2889                         mo_invalidate(info->mti_env, mdt_object_child(o));
2890
2891                 if (decref || !info->mti_has_trans ||
2892                     !(mode & (LCK_PW | LCK_EX))) {
2893                         ldlm_lock_decref_and_cancel(h, mode);
2894                         LDLM_LOCK_PUT(lock);
2895                 } else {
2896                         struct ptlrpc_request *req = mdt_info_req(info);
2897
2898                         LASSERT(req != NULL);
2899                         tgt_save_slc_lock(&info->mti_mdt->mdt_lut, lock,
2900                                           req->rq_transno);
2901                         ldlm_lock_decref(h, mode);
2902                 }
2903                 h->cookie = 0ull;
2904         }
2905
2906         EXIT;
2907 }
2908
2909 /**
2910  * Unlock mdt object.
2911  *
2912  * Immeditely release the regular lock and the PDO lock or save the
2913  * lock in request and keep them referenced until client ACK or
2914  * transaction commit.
2915  *
2916  * \param info thread info object
2917  * \param o mdt object
2918  * \param lh mdt lock handle referencing regular and PDO locks
2919  * \param decref force immediate lock releasing
2920  *
2921  * XXX o is not used and may be NULL, see hsm_cdt_request_completed().
2922  */
2923 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2924                        struct mdt_lock_handle *lh, int decref)
2925 {
2926         ENTRY;
2927
2928         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2929         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2930         mdt_save_remote_lock(info, o, &lh->mlh_rreg_lh, lh->mlh_rreg_mode,
2931                              decref);
2932
2933         EXIT;
2934 }
2935
2936 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2937                                         const struct lu_fid *f,
2938                                         struct mdt_lock_handle *lh,
2939                                         __u64 ibits)
2940 {
2941         struct mdt_object *o;
2942
2943         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2944         if (!IS_ERR(o)) {
2945                 int rc;
2946
2947                 rc = mdt_object_lock(info, o, lh, ibits);
2948                 if (rc != 0) {
2949                         mdt_object_put(info->mti_env, o);
2950                         o = ERR_PTR(rc);
2951                 }
2952         }
2953         return o;
2954 }
2955
2956 void mdt_object_unlock_put(struct mdt_thread_info * info,
2957                            struct mdt_object * o,
2958                            struct mdt_lock_handle *lh,
2959                            int decref)
2960 {
2961         mdt_object_unlock(info, o, lh, decref);
2962         mdt_object_put(info->mti_env, o);
2963 }
2964
2965 /*
2966  * Generic code handling requests that have struct mdt_body passed in:
2967  *
2968  *  - extract mdt_body from request and save it in @info, if present;
2969  *
2970  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2971  *  @info;
2972  *
2973  *  - if HABEO_CORPUS flag is set for this request type check whether object
2974  *  actually exists on storage (lu_object_exists()).
2975  *
2976  */
2977 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2978 {
2979         const struct mdt_body    *body;
2980         struct mdt_object        *obj;
2981         const struct lu_env      *env;
2982         struct req_capsule       *pill;
2983         int                       rc;
2984         ENTRY;
2985
2986         env = info->mti_env;
2987         pill = info->mti_pill;
2988
2989         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2990         if (body == NULL)
2991                 RETURN(-EFAULT);
2992
2993         if (!(body->mbo_valid & OBD_MD_FLID))
2994                 RETURN(0);
2995
2996         if (!fid_is_sane(&body->mbo_fid1)) {
2997                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
2998                 RETURN(-EINVAL);
2999         }
3000
3001         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
3002         if (!IS_ERR(obj)) {
3003                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
3004                         mdt_object_put(env, obj);
3005                         rc = -ENOENT;
3006                 } else {
3007                         info->mti_object = obj;
3008                         rc = 0;
3009                 }
3010         } else
3011                 rc = PTR_ERR(obj);
3012
3013         RETURN(rc);
3014 }
3015
3016 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
3017 {
3018         struct req_capsule *pill = info->mti_pill;
3019         int rc;
3020         ENTRY;
3021
3022         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
3023                 rc = mdt_body_unpack(info, flags);
3024         else
3025                 rc = 0;
3026
3027         if (rc == 0 && (flags & HABEO_REFERO)) {
3028                 /* Pack reply. */
3029                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
3030                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
3031                                              DEF_REP_MD_SIZE);
3032                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
3033                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
3034                                              RCL_SERVER, 0);
3035
3036                 rc = req_capsule_server_pack(pill);
3037         }
3038         RETURN(rc);
3039 }
3040
3041 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
3042 {
3043         lh->mlh_type = MDT_NUL_LOCK;
3044         lh->mlh_reg_lh.cookie = 0ull;
3045         lh->mlh_reg_mode = LCK_MINMODE;
3046         lh->mlh_pdo_lh.cookie = 0ull;
3047         lh->mlh_pdo_mode = LCK_MINMODE;
3048         lh->mlh_rreg_lh.cookie = 0ull;
3049         lh->mlh_rreg_mode = LCK_MINMODE;
3050 }
3051
3052 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
3053 {
3054         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
3055         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
3056 }
3057
3058 /*
3059  * Initialize fields of struct mdt_thread_info. Other fields are left in
3060  * uninitialized state, because it's too expensive to zero out whole
3061  * mdt_thread_info (> 1K) on each request arrival.
3062  */
3063 void mdt_thread_info_init(struct ptlrpc_request *req,
3064                           struct mdt_thread_info *info)
3065 {
3066         int i;
3067
3068         info->mti_pill = &req->rq_pill;
3069
3070         /* lock handle */
3071         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3072                 mdt_lock_handle_init(&info->mti_lh[i]);
3073
3074         /* mdt device: it can be NULL while CONNECT */
3075         if (req->rq_export) {
3076                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
3077                 info->mti_exp = req->rq_export;
3078         } else
3079                 info->mti_mdt = NULL;
3080         info->mti_env = req->rq_svc_thread->t_env;
3081         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
3082
3083         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
3084         info->mti_big_buf = LU_BUF_NULL;
3085         info->mti_body = NULL;
3086         info->mti_object = NULL;
3087         info->mti_dlm_req = NULL;
3088         info->mti_has_trans = 0;
3089         info->mti_cross_ref = 0;
3090         info->mti_opdata = 0;
3091         info->mti_big_lmm_used = 0;
3092
3093         info->mti_spec.no_create = 0;
3094         info->mti_spec.sp_rm_entry = 0;
3095         info->mti_spec.sp_permitted = 0;
3096         info->mti_spec.sp_migrate_close = 0;
3097
3098         info->mti_spec.u.sp_ea.eadata = NULL;
3099         info->mti_spec.u.sp_ea.eadatalen = 0;
3100 }
3101
3102 void mdt_thread_info_fini(struct mdt_thread_info *info)
3103 {
3104         int i;
3105
3106         if (info->mti_object != NULL) {
3107                 mdt_object_put(info->mti_env, info->mti_object);
3108                 info->mti_object = NULL;
3109         }
3110
3111         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3112                 mdt_lock_handle_fini(&info->mti_lh[i]);
3113         info->mti_env = NULL;
3114         info->mti_pill = NULL;
3115         info->mti_exp = NULL;
3116
3117         if (unlikely(info->mti_big_buf.lb_buf != NULL))
3118                 lu_buf_free(&info->mti_big_buf);
3119 }
3120
3121 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
3122 {
3123         struct mdt_thread_info  *mti;
3124
3125         mti = mdt_th_info(tsi->tsi_env);
3126         LASSERT(mti != NULL);
3127
3128         mdt_thread_info_init(tgt_ses_req(tsi), mti);
3129         if (tsi->tsi_corpus != NULL) {
3130                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
3131                 lu_object_get(tsi->tsi_corpus);
3132         }
3133         mti->mti_body = tsi->tsi_mdt_body;
3134         mti->mti_dlm_req = tsi->tsi_dlm_req;
3135
3136         return mti;
3137 }
3138
3139 static int mdt_tgt_connect(struct tgt_session_info *tsi)
3140 {
3141         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
3142             cfs_fail_val ==
3143             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
3144                 set_current_state(TASK_UNINTERRUPTIBLE);
3145                 schedule_timeout(msecs_to_jiffies(3 * MSEC_PER_SEC));
3146         }
3147
3148         return tgt_connect(tsi);
3149 }
3150
3151 enum mdt_it_code {
3152         MDT_IT_OPEN,
3153         MDT_IT_OCREAT,
3154         MDT_IT_CREATE,
3155         MDT_IT_GETATTR,
3156         MDT_IT_READDIR,
3157         MDT_IT_LOOKUP,
3158         MDT_IT_UNLINK,
3159         MDT_IT_TRUNC,
3160         MDT_IT_GETXATTR,
3161         MDT_IT_LAYOUT,
3162         MDT_IT_QUOTA,
3163         MDT_IT_NR
3164 };
3165
3166 static int mdt_intent_getattr(enum mdt_it_code opcode,
3167                               struct mdt_thread_info *info,
3168                               struct ldlm_lock **,
3169                               __u64);
3170
3171 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3172                                 struct mdt_thread_info *info,
3173                                 struct ldlm_lock **lockp,
3174                                 __u64 flags);
3175
3176 static int mdt_intent_layout(enum mdt_it_code opcode,
3177                              struct mdt_thread_info *info,
3178                              struct ldlm_lock **,
3179                              __u64);
3180 static int mdt_intent_reint(enum mdt_it_code opcode,
3181                             struct mdt_thread_info *info,
3182                             struct ldlm_lock **,
3183                             __u64);
3184
3185 static struct mdt_it_flavor {
3186         const struct req_format *it_fmt;
3187         __u32                    it_flags;
3188         int                    (*it_act)(enum mdt_it_code ,
3189                                          struct mdt_thread_info *,
3190                                          struct ldlm_lock **,
3191                                          __u64);
3192         long                     it_reint;
3193 } mdt_it_flavor[] = {
3194         [MDT_IT_OPEN]     = {
3195                 .it_fmt   = &RQF_LDLM_INTENT,
3196                 /*.it_flags = HABEO_REFERO,*/
3197                 .it_flags = 0,
3198                 .it_act   = mdt_intent_reint,
3199                 .it_reint = REINT_OPEN
3200         },
3201         [MDT_IT_OCREAT]   = {
3202                 .it_fmt   = &RQF_LDLM_INTENT,
3203                 /*
3204                  * OCREAT is not a MUTABOR request as if the file
3205                  * already exists.
3206                  * We do the extra check of OBD_CONNECT_RDONLY in
3207                  * mdt_reint_open() when we really need to create
3208                  * the object.
3209                  */
3210                 .it_flags = 0,
3211                 .it_act   = mdt_intent_reint,
3212                 .it_reint = REINT_OPEN
3213         },
3214         [MDT_IT_CREATE]   = {
3215                 .it_fmt   = &RQF_LDLM_INTENT,
3216                 .it_flags = MUTABOR,
3217                 .it_act   = mdt_intent_reint,
3218                 .it_reint = REINT_CREATE
3219         },
3220         [MDT_IT_GETATTR]  = {
3221                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3222                 .it_flags = HABEO_REFERO,
3223                 .it_act   = mdt_intent_getattr
3224         },
3225         [MDT_IT_READDIR]  = {
3226                 .it_fmt   = NULL,
3227                 .it_flags = 0,
3228                 .it_act   = NULL
3229         },
3230         [MDT_IT_LOOKUP]   = {
3231                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3232                 .it_flags = HABEO_REFERO,
3233                 .it_act   = mdt_intent_getattr
3234         },
3235         [MDT_IT_UNLINK]   = {
3236                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
3237                 .it_flags = MUTABOR,
3238                 .it_act   = NULL,
3239                 .it_reint = REINT_UNLINK
3240         },
3241         [MDT_IT_TRUNC]    = {
3242                 .it_fmt   = NULL,
3243                 .it_flags = MUTABOR,
3244                 .it_act   = NULL
3245         },
3246         [MDT_IT_GETXATTR] = {
3247                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
3248                 .it_flags = HABEO_CORPUS,
3249                 .it_act   = mdt_intent_getxattr
3250         },
3251         [MDT_IT_LAYOUT] = {
3252                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
3253                 .it_flags = 0,
3254                 .it_act   = mdt_intent_layout
3255         }
3256 };
3257
3258 static int
3259 mdt_intent_lock_replace(struct mdt_thread_info *info,
3260                         struct ldlm_lock **lockp,
3261                         struct mdt_lock_handle *lh,
3262                         __u64 flags, int result)
3263 {
3264         struct ptlrpc_request  *req = mdt_info_req(info);
3265         struct ldlm_lock       *lock = *lockp;
3266         struct ldlm_lock       *new_lock;
3267
3268         /* If possible resent found a lock, @lh is set to its handle */
3269         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3270
3271         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3272                 lh->mlh_reg_lh.cookie = 0;
3273                 RETURN(0);
3274         }
3275
3276         if (new_lock == NULL && (flags & LDLM_FL_RESENT)) {
3277                 /* Lock is pinned by ldlm_handle_enqueue0() as it is
3278                  * a resend case, however, it could be already destroyed
3279                  * due to client eviction or a raced cancel RPC. */
3280                 LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx\n",
3281                                   lh->mlh_reg_lh.cookie);
3282                 lh->mlh_reg_lh.cookie = 0;
3283                 RETURN(-ESTALE);
3284         }
3285
3286         LASSERTF(new_lock != NULL,
3287                  "lockh %#llx flags %#llx : rc = %d\n",
3288                  lh->mlh_reg_lh.cookie, flags, result);
3289
3290         /*
3291          * If we've already given this lock to a client once, then we should
3292          * have no readers or writers.  Otherwise, we should have one reader
3293          * _or_ writer ref (which will be zeroed below) before returning the
3294          * lock to a client.
3295          */
3296         if (new_lock->l_export == req->rq_export) {
3297                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3298         } else {
3299                 LASSERT(new_lock->l_export == NULL);
3300                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3301         }
3302
3303         *lockp = new_lock;
3304
3305         if (new_lock->l_export == req->rq_export) {
3306                 /*
3307                  * Already gave this to the client, which means that we
3308                  * reconstructed a reply.
3309                  */
3310                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3311                         MSG_RESENT);
3312
3313                 LDLM_LOCK_RELEASE(new_lock);
3314                 lh->mlh_reg_lh.cookie = 0;
3315                 RETURN(ELDLM_LOCK_REPLACED);
3316         }
3317
3318         /*
3319          * Fixup the lock to be given to the client.
3320          */
3321         lock_res_and_lock(new_lock);
3322         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3323          * possible blocking AST. */
3324         while (new_lock->l_readers > 0) {
3325                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3326                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3327                 new_lock->l_readers--;
3328         }
3329         while (new_lock->l_writers > 0) {
3330                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3331                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3332                 new_lock->l_writers--;
3333         }
3334
3335         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3336         new_lock->l_blocking_ast = lock->l_blocking_ast;
3337         new_lock->l_completion_ast = lock->l_completion_ast;
3338         new_lock->l_remote_handle = lock->l_remote_handle;
3339         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3340
3341         unlock_res_and_lock(new_lock);
3342
3343         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3344                      &new_lock->l_remote_handle,
3345                      &new_lock->l_exp_hash);
3346
3347         LDLM_LOCK_RELEASE(new_lock);
3348         lh->mlh_reg_lh.cookie = 0;
3349
3350         RETURN(ELDLM_LOCK_REPLACED);
3351 }
3352
3353 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3354                                     struct ldlm_lock *new_lock,
3355                                     struct mdt_lock_handle *lh,
3356                                     __u64 flags)
3357 {
3358         struct ptlrpc_request  *req = mdt_info_req(info);
3359         struct ldlm_request    *dlmreq;
3360
3361         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3362                 return;
3363
3364         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3365
3366         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3367          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3368          * initialized. */
3369         if (flags & LDLM_FL_RESENT) {
3370                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3371                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3372
3373                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3374                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie %#llx",
3375                           lh->mlh_reg_lh.cookie);
3376                 return;
3377         }
3378
3379         /*
3380          * If the xid matches, then we know this is a resent request, and allow
3381          * it. (It's probably an OPEN, for which we don't send a lock.
3382          */
3383         if (req_can_reconstruct(req, NULL))
3384                 return;
3385
3386         /*
3387          * This remote handle isn't enqueued, so we never received or processed
3388          * this request.  Clear MSG_RESENT, because it can be handled like any
3389          * normal request now.
3390          */
3391         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3392
3393         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle %#llx",
3394                   dlmreq->lock_handle[0].cookie);
3395 }
3396
3397 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3398                                 struct mdt_thread_info *info,
3399                                 struct ldlm_lock **lockp,
3400                                 __u64 flags)
3401 {
3402         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3403         struct ldlm_reply      *ldlm_rep = NULL;
3404         int rc;
3405         ENTRY;
3406
3407         /*
3408          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3409          * (for the resend case) or a new lock. Below we will use it to
3410          * replace the original lock.
3411          */
3412         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3413         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3414                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3415                 rc = mdt_object_lock(info, info->mti_object, lhc,
3416                                      MDS_INODELOCK_XATTR);
3417                 if (rc)
3418                         return rc;
3419         }
3420
3421         rc = mdt_getxattr(info);
3422
3423         if (mdt_info_req(info)->rq_repmsg != NULL)
3424                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3425
3426         if (ldlm_rep == NULL ||
3427             OBD_FAIL_CHECK(OBD_FAIL_MDS_XATTR_REP)) {
3428                 mdt_object_unlock(info,  info->mti_object, lhc, 1);
3429                 RETURN(err_serious(-EFAULT));
3430         }
3431
3432         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3433
3434         /* This is left for interop instead of adding a new interop flag.
3435          * LU-7433 */
3436 #if LUSTRE_VERSION_CODE > OBD_OCD_VERSION(3, 0, 0, 0)
3437         if (ldlm_rep->lock_policy_res2) {
3438                 mdt_object_unlock(info, info->mti_object, lhc, 1);
3439                 RETURN(ELDLM_LOCK_ABORTED);
3440         }
3441 #endif
3442
3443         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3444         RETURN(rc);
3445 }
3446
3447 static int mdt_intent_getattr(enum mdt_it_code opcode,
3448                               struct mdt_thread_info *info,
3449                               struct ldlm_lock **lockp,
3450                               __u64 flags)
3451 {
3452         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3453         __u64                   child_bits;
3454         struct ldlm_reply      *ldlm_rep;
3455         struct mdt_body        *reqbody;
3456         struct mdt_body        *repbody;
3457         int                     rc, rc2;
3458         ENTRY;
3459
3460         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3461         LASSERT(reqbody);
3462
3463         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3464         LASSERT(repbody);
3465
3466         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3467         repbody->mbo_eadatasize = 0;
3468         repbody->mbo_aclsize = 0;
3469
3470         switch (opcode) {
3471         case MDT_IT_LOOKUP:
3472                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3473                 break;
3474         case MDT_IT_GETATTR:
3475                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3476                              MDS_INODELOCK_PERM;
3477                 break;
3478         default:
3479                 CERROR("Unsupported intent (%d)\n", opcode);
3480                 GOTO(out_shrink, rc = -EINVAL);
3481         }
3482
3483         rc = mdt_init_ucred_intent_getattr(info, reqbody);
3484         if (rc)
3485                 GOTO(out_shrink, rc);
3486
3487         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3488         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3489
3490         /* Get lock from request for possible resent case. */
3491         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3492
3493         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3494         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3495
3496         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3497                 ldlm_rep->lock_policy_res2 = 0;
3498         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3499             ldlm_rep->lock_policy_res2) {
3500                 lhc->mlh_reg_lh.cookie = 0ull;
3501                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3502         }
3503
3504         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3505         EXIT;
3506 out_ucred:
3507         mdt_exit_ucred(info);
3508 out_shrink:
3509         mdt_client_compatibility(info);
3510         rc2 = mdt_fix_reply(info);
3511         if (rc == 0)
3512                 rc = rc2;
3513         return rc;
3514 }
3515
3516 static int mdt_intent_layout(enum mdt_it_code opcode,
3517                              struct mdt_thread_info *info,
3518                              struct ldlm_lock **lockp,
3519                              __u64 flags)
3520 {
3521         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3522         struct layout_intent *layout;
3523         struct lu_fid *fid;
3524         struct mdt_object *obj = NULL;
3525         bool layout_change = false;
3526         int layout_size = 0;
3527         int rc = 0;
3528         ENTRY;
3529
3530         if (opcode != MDT_IT_LAYOUT) {
3531                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3532                         opcode);
3533                 RETURN(-EINVAL);
3534         }
3535
3536         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3537         if (layout == NULL)
3538                 RETURN(-EPROTO);
3539
3540         switch (layout->li_opc) {
3541         case LAYOUT_INTENT_TRUNC:
3542         case LAYOUT_INTENT_WRITE:
3543                 layout_change = true;
3544                 break;
3545         case LAYOUT_INTENT_ACCESS:
3546                 break;
3547         case LAYOUT_INTENT_READ:
3548         case LAYOUT_INTENT_GLIMPSE:
3549         case LAYOUT_INTENT_RELEASE:
3550         case LAYOUT_INTENT_RESTORE:
3551                 CERROR("%s: Unsupported layout intent opc %d\n",
3552                        mdt_obd_name(info->mti_mdt), layout->li_opc);
3553                 rc = -ENOTSUPP;
3554                 break;
3555         default:
3556                 CERROR("%s: Unknown layout intent opc %d\n",
3557                        mdt_obd_name(info->mti_mdt), layout->li_opc);
3558                 rc = -EINVAL;
3559                 break;
3560         }
3561         if (rc < 0)
3562                 RETURN(rc);
3563
3564         fid = &info->mti_tmp_fid2;
3565         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3566
3567         /* Get lock from request for possible resent case. */
3568         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3569
3570         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3571         if (IS_ERR(obj))
3572                 GOTO(out, rc = PTR_ERR(obj));
3573
3574         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3575                 layout_size = mdt_attr_get_eabuf_size(info, obj);
3576                 if (layout_size < 0)
3577                         GOTO(out_obj, rc = layout_size);
3578
3579                 if (layout_size > info->mti_mdt->mdt_max_mdsize)
3580                         info->mti_mdt->mdt_max_mdsize = layout_size;
3581         }
3582
3583         /*
3584          * set reply buffer size, so that ldlm_handle_enqueue0()->
3585          * ldlm_lvbo_fill() will fill the reply buffer with lovea.
3586          */
3587         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3588         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3589                              layout_size);
3590         rc = req_capsule_server_pack(info->mti_pill);
3591         if (rc)
3592                 GOTO(out_obj, rc);
3593
3594
3595         if (layout_change) {
3596                 struct lu_buf *buf = &info->mti_buf;
3597
3598                 /**
3599                  * mdt_layout_change is a reint operation, when the request
3600                  * is resent, layout write shouldn't reprocess it again.
3601                  */
3602                 rc = mdt_check_resent(info, mdt_reconstruct_generic, lhc);
3603                 if (rc)
3604                         GOTO(out_obj, rc = rc < 0 ? rc : 0);
3605
3606                 /**
3607                  * There is another resent case: the client's job has been
3608                  * done by another client, referring lod_declare_layout_change
3609                  * -EALREADY case, and it became a operation w/o transaction,
3610                  * so we should not do the layout change, otherwise
3611                  * mdt_layout_change() will try to cancel the granted server
3612                  * CR lock whose remote counterpart is still in hold on the
3613                  * client, and a deadlock ensues.
3614                  */
3615                 rc = mdt_check_resent_lock(info, obj, lhc);
3616                 if (rc <= 0)
3617                         GOTO(out_obj, rc);
3618
3619                 buf->lb_buf = NULL;
3620                 buf->lb_len = 0;
3621                 if (unlikely(req_is_replay(mdt_info_req(info)))) {
3622                         buf->lb_buf = req_capsule_client_get(info->mti_pill,
3623                                         &RMF_EADATA);
3624                         buf->lb_len = req_capsule_get_size(info->mti_pill,
3625                                         &RMF_EADATA, RCL_CLIENT);
3626                         /*
3627                          * If it's a replay of layout write intent RPC, the
3628                          * client has saved the extended lovea when
3629                          * it get reply then.
3630                          */
3631                         if (buf->lb_len > 0)
3632                                 mdt_fix_lov_magic(info, buf->lb_buf);
3633                 }
3634
3635                 /*
3636                  * Instantiate some layout components, if @buf contains
3637                  * lovea, then it's a replay of the layout intent write
3638                  * RPC.
3639                  */
3640                 rc = mdt_layout_change(info, obj, layout, buf);
3641                 if (rc)
3642                         GOTO(out_obj, rc);
3643         }
3644 out_obj:
3645         mdt_object_put(info->mti_env, obj);
3646
3647         if (rc == 0 && lustre_handle_is_used(&lhc->mlh_reg_lh))
3648                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3649
3650 out:
3651         lhc->mlh_reg_lh.cookie = 0;
3652
3653         return rc;
3654 }
3655
3656 static int mdt_intent_reint(enum mdt_it_code opcode,
3657                             struct mdt_thread_info *info,
3658                             struct ldlm_lock **lockp,
3659                             __u64 flags)
3660 {
3661         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3662         struct ldlm_reply      *rep = NULL;
3663         long                    opc;
3664         int                     rc;
3665
3666         static const struct req_format *intent_fmts[REINT_MAX] = {
3667                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3668                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3669         };
3670
3671         ENTRY;
3672
3673         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3674         if (opc < 0)
3675                 RETURN(opc);
3676
3677         if (mdt_it_flavor[opcode].it_reint != opc) {
3678                 CERROR("Reint code %ld doesn't match intent: %d\n",
3679                        opc, opcode);
3680                 RETURN(err_serious(-EPROTO));
3681         }
3682
3683         /* Get lock from request for possible resent case. */
3684         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3685
3686         rc = mdt_reint_internal(info, lhc, opc);
3687
3688         /* Check whether the reply has been packed successfully. */
3689         if (mdt_info_req(info)->rq_repmsg != NULL)
3690                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3691         if (rep == NULL)
3692                 RETURN(err_serious(-EFAULT));
3693
3694         /* MDC expects this in any case */
3695         if (rc != 0)
3696                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3697
3698         /* the open lock or the lock for cross-ref object should be
3699          * returned to the client */
3700         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3701             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3702                 rep->lock_policy_res2 = 0;
3703                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3704                 RETURN(rc);
3705         }
3706
3707         rep->lock_policy_res2 = clear_serious(rc);
3708
3709         if (rep->lock_policy_res2 == -ENOENT &&
3710             mdt_get_disposition(rep, DISP_LOOKUP_NEG) &&
3711             !mdt_get_disposition(rep, DISP_OPEN_CREATE))
3712                 rep->lock_policy_res2 = 0;
3713
3714         lhc->mlh_reg_lh.cookie = 0ull;
3715         if (rc == -ENOTCONN || rc == -ENODEV ||
3716             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3717                 /*
3718                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3719                  * will be returned by rq_status, and client at ptlrpc layer
3720                  * will detect this, then disconnect, reconnect the import
3721                  * immediately, instead of impacting the following the rpc.
3722                  */
3723                 RETURN(rc);
3724         }
3725         /*
3726          * For other cases, the error will be returned by intent, and client
3727          * will retrieve the result from intent.
3728          */
3729         RETURN(ELDLM_LOCK_ABORTED);
3730 }
3731
3732 static int mdt_intent_code(enum ldlm_intent_flags itcode)
3733 {
3734         int rc;
3735
3736         switch (itcode) {
3737         case IT_OPEN:
3738                 rc = MDT_IT_OPEN;
3739                 break;
3740         case IT_OPEN|IT_CREAT:
3741                 rc = MDT_IT_OCREAT;
3742                 break;
3743         case IT_CREAT:
3744                 rc = MDT_IT_CREATE;
3745                 break;
3746         case IT_READDIR:
3747                 rc = MDT_IT_READDIR;
3748                 break;
3749         case IT_GETATTR:
3750                 rc = MDT_IT_GETATTR;
3751                 break;
3752         case IT_LOOKUP:
3753                 rc = MDT_IT_LOOKUP;
3754                 break;
3755         case IT_UNLINK:
3756                 rc = MDT_IT_UNLINK;
3757                 break;
3758         case IT_TRUNC:
3759                 rc = MDT_IT_TRUNC;
3760                 break;
3761         case IT_GETXATTR:
3762                 rc = MDT_IT_GETXATTR;
3763                 break;
3764         case IT_LAYOUT:
3765                 rc = MDT_IT_LAYOUT;
3766                 break;
3767         case IT_QUOTA_DQACQ:
3768         case IT_QUOTA_CONN:
3769                 rc = MDT_IT_QUOTA;
3770                 break;
3771         default:
3772                 CERROR("Unknown intent opcode: 0x%08x\n", itcode);
3773                 rc = -EINVAL;
3774                 break;
3775         }
3776         return rc;
3777 }
3778
3779 static int mdt_intent_opc(enum ldlm_intent_flags itopc,
3780                           struct mdt_thread_info *info,
3781                           struct ldlm_lock **lockp, __u64 flags)
3782 {
3783         struct req_capsule      *pill = info->mti_pill;
3784         struct ptlrpc_request   *req = mdt_info_req(info);
3785         struct mdt_it_flavor    *flv;
3786         int opc;
3787         int rc;
3788         ENTRY;
3789
3790         opc = mdt_intent_code(itopc);
3791         if (opc < 0)
3792                 RETURN(-EINVAL);
3793
3794         if (opc == MDT_IT_QUOTA) {
3795                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3796
3797                 if (qmt == NULL)
3798                         RETURN(-EOPNOTSUPP);
3799
3800                 if (mdt_rdonly(req->rq_export))
3801                         RETURN(-EROFS);
3802
3803                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3804                 /* pass the request to quota master */
3805                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3806                                                  mdt_info_req(info), lockp,
3807                                                  flags);
3808                 RETURN(rc);
3809         }
3810
3811         flv = &mdt_it_flavor[opc];
3812         if (flv->it_fmt != NULL)
3813                 req_capsule_extend(pill, flv->it_fmt);
3814
3815         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3816         if (rc < 0)
3817                 RETURN(rc);
3818
3819         if (flv->it_flags & MUTABOR && mdt_rdonly(req->rq_export))
3820                 RETURN(-EROFS);
3821
3822         if (flv->it_act != NULL) {
3823                 struct ldlm_reply *rep;
3824
3825                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
3826
3827                 /* execute policy */
3828                 rc = flv->it_act(opc, info, lockp, flags);
3829
3830                 /* Check whether the reply has been packed successfully. */
3831                 if (req->rq_repmsg != NULL) {
3832                         rep = req_capsule_server_get(info->mti_pill,
3833                                                      &RMF_DLM_REP);
3834                         rep->lock_policy_res2 =
3835                                 ptlrpc_status_hton(rep->lock_policy_res2);
3836                 }
3837         }
3838
3839         RETURN(rc);
3840 }
3841
3842 static int mdt_intent_policy(struct ldlm_namespace *ns,
3843                              struct ldlm_lock **lockp, void *req_cookie,
3844                              enum ldlm_mode mode, __u64 flags, void *data)
3845 {
3846         struct tgt_session_info *tsi;
3847         struct mdt_thread_info  *info;
3848         struct ptlrpc_request   *req  =  req_cookie;
3849         struct ldlm_intent      *it;
3850         struct req_capsule      *pill;
3851         int rc;
3852
3853         ENTRY;
3854
3855         LASSERT(req != NULL);
3856
3857         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3858
3859         info = tsi2mdt_info(tsi);
3860         LASSERT(info != NULL);
3861         pill = info->mti_pill;
3862         LASSERT(pill->rc_req == req);
3863
3864         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3865                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3866                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3867                 if (it != NULL) {
3868                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3869                         if (rc == 0)
3870                                 rc = ELDLM_OK;
3871
3872                         /* Lock without inodebits makes no sense and will oops
3873                          * later in ldlm. Let's check it now to see if we have
3874                          * ibits corrupted somewhere in mdt_intent_opc().
3875                          * The case for client miss to set ibits has been
3876                          * processed by others. */
3877                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3878                                         lr_type == LDLM_IBITS,
3879                                      info->mti_dlm_req->lock_desc.\
3880                                         l_policy_data.l_inodebits.bits != 0));
3881                 } else
3882                         rc = err_serious(-EFAULT);
3883         } else {
3884                 /* No intent was provided */
3885                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3886                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3887                 rc = req_capsule_server_pack(pill);
3888                 if (rc)
3889                         rc = err_serious(rc);
3890         }
3891         mdt_thread_info_fini(info);
3892         RETURN(rc);
3893 }
3894
3895 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3896 {
3897         struct seq_server_site  *ss = mdt_seq_site(mdt);
3898
3899         if (ss->ss_node_id == 0)
3900                 return;
3901
3902         if (ss->ss_client_seq != NULL) {
3903                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3904                 ss->ss_client_seq->lcs_exp = NULL;
3905         }
3906
3907         if (ss->ss_server_fld != NULL) {
3908                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3909                 ss->ss_server_fld->lsf_control_exp = NULL;
3910         }
3911 }
3912
3913 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3914 {
3915         struct seq_server_site *ss = mdt_seq_site(mdt);
3916
3917         if (ss == NULL)
3918                 return;
3919
3920         if (ss->ss_server_seq != NULL)
3921                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3922 }
3923
3924 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3925 {
3926         mdt_seq_fini_cli(mdt);
3927         mdt_deregister_seq_exp(mdt);
3928
3929         return seq_site_fini(env, mdt_seq_site(mdt));
3930 }
3931
3932 /**
3933  * It will retrieve its FLDB entries from MDT0, and it only happens
3934  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3935  * and it needs to refresh FLDB from the MDT0.
3936  **/
3937 static int mdt_register_lwp_callback(void *data)
3938 {
3939         struct lu_env           env;
3940         struct mdt_device       *mdt = data;
3941         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3942         int                     rc;
3943         ENTRY;
3944
3945         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3946
3947         rc = lu_env_init(&env, LCT_MD_THREAD);
3948         if (rc < 0) {
3949                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3950                 RETURN(rc);
3951         }
3952
3953         /* Allocate new sequence now to avoid creating local transaction
3954          * in the normal transaction process */
3955         rc = seq_server_check_and_alloc_super(&env,
3956                                               mdt_seq_site(mdt)->ss_server_seq);
3957         if (rc < 0)
3958                 GOTO(out, rc);
3959
3960         if (fld->lsf_new) {
3961                 rc = fld_update_from_controller(&env, fld);
3962                 if (rc != 0) {
3963                         CERROR("%s: cannot update controller: rc = %d\n",
3964                                mdt_obd_name(mdt), rc);
3965                         GOTO(out, rc);
3966                 }
3967         }
3968 out:
3969         lu_env_fini(&env);
3970         RETURN(rc);
3971 }
3972
3973 static int mdt_register_seq_exp(struct mdt_device *mdt)
3974 {
3975         struct seq_server_site  *ss = mdt_seq_site(mdt);
3976         char                    *lwp_name = NULL;
3977         int                     rc;
3978
3979         if (ss->ss_node_id == 0)
3980                 return 0;
3981
3982         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3983         if (lwp_name == NULL)
3984                 GOTO(out_free, rc = -ENOMEM);
3985
3986         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3987         if (rc != 0)
3988                 GOTO(out_free, rc);
3989
3990         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3991                                       NULL, NULL);
3992         if (rc != 0)
3993                 GOTO(out_free, rc);
3994
3995         rc = lustre_register_lwp_item(lwp_name,
3996                                       &ss->ss_server_fld->lsf_control_exp,
3997                                       mdt_register_lwp_callback, mdt);
3998         if (rc != 0) {
3999                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
4000                 ss->ss_client_seq->lcs_exp = NULL;
4001                 GOTO(out_free, rc);
4002         }
4003 out_free:
4004         if (lwp_name != NULL)
4005                 OBD_FREE(lwp_name, MAX_OBD_NAME);
4006
4007         return rc;
4008 }
4009
4010 /*
4011  * Init client sequence manager which is used by local MDS to talk to sequence
4012  * controller on remote node.
4013  */
4014 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
4015 {
4016         struct seq_server_site  *ss = mdt_seq_site(mdt);
4017         int                     rc;
4018         char                    *prefix;
4019         ENTRY;
4020
4021         /* check if this is adding the first MDC and controller is not yet
4022          * initialized. */
4023         OBD_ALLOC_PTR(ss->ss_client_seq);
4024         if (ss->ss_client_seq == NULL)
4025                 RETURN(-ENOMEM);
4026
4027         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
4028         if (prefix == NULL) {
4029                 OBD_FREE_PTR(ss->ss_client_seq);
4030                 ss->ss_client_seq = NULL;
4031                 RETURN(-ENOMEM);
4032         }
4033
4034         /* Note: seq_client_fini will be called in seq_site_fini */
4035         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
4036         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
4037                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
4038                                                             NULL);
4039         OBD_FREE(prefix, MAX_OBD_NAME + 5);
4040         if (rc != 0) {
4041                 OBD_FREE_PTR(ss->ss_client_seq);
4042                 ss->ss_client_seq = NULL;
4043                 RETURN(rc);
4044         }
4045
4046         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
4047
4048         RETURN(rc);
4049 }
4050
4051 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
4052 {
4053         struct seq_server_site  *ss;
4054         int                     rc;
4055         ENTRY;
4056
4057         ss = mdt_seq_site(mdt);
4058         /* init sequence controller server(MDT0) */
4059         if (ss->ss_node_id == 0) {
4060                 OBD_ALLOC_PTR(ss->ss_control_seq);
4061                 if (ss->ss_control_seq == NULL)
4062                         RETURN(-ENOMEM);
4063
4064                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
4065                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
4066                                      ss);
4067                 if (rc)
4068                         GOTO(out_seq_fini, rc);
4069         }
4070
4071         /* Init normal sequence server */
4072         OBD_ALLOC_PTR(ss->ss_server_seq);
4073         if (ss->ss_server_seq == NULL)
4074                 GOTO(out_seq_fini, rc = -ENOMEM);
4075
4076         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
4077                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
4078         if (rc)
4079                 GOTO(out_seq_fini, rc);
4080
4081         /* init seq client for seq server to talk to seq controller(MDT0) */
4082         rc = mdt_seq_init_cli(env, mdt);
4083         if (rc != 0)
4084                 GOTO(out_seq_fini, rc);
4085
4086         if (ss->ss_node_id != 0)
4087                 /* register controller export through lwp */
4088                 rc = mdt_register_seq_exp(mdt);
4089
4090         EXIT;
4091 out_seq_fini:
4092         if (rc)
4093                 mdt_seq_fini(env, mdt);
4094
4095         return rc;
4096 }
4097
4098 /*
4099  * FLD wrappers
4100  */
4101 static int mdt_fld_fini(const struct lu_env *env,
4102                         struct mdt_device *m)
4103 {
4104         struct seq_server_site *ss = mdt_seq_site(m);
4105         ENTRY;
4106
4107         if (ss && ss->ss_server_fld) {
4108                 fld_server_fini(env, ss->ss_server_fld);
4109                 OBD_FREE_PTR(ss->ss_server_fld);
4110                 ss->ss_server_fld = NULL;
4111         }
4112
4113         RETURN(0);
4114 }
4115
4116 static int mdt_fld_init(const struct lu_env *env,
4117                         const char *uuid,
4118                         struct mdt_device *m)
4119 {
4120         struct seq_server_site *ss;
4121         int rc;
4122         ENTRY;
4123
4124         ss = mdt_seq_site(m);
4125
4126         OBD_ALLOC_PTR(ss->ss_server_fld);
4127         if (ss->ss_server_fld == NULL)
4128                 RETURN(rc = -ENOMEM);
4129
4130         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
4131                              LU_SEQ_RANGE_MDT);
4132         if (rc) {
4133                 OBD_FREE_PTR(ss->ss_server_fld);
4134                 ss->ss_server_fld = NULL;
4135                 RETURN(rc);
4136         }
4137
4138         RETURN(0);
4139 }
4140
4141 static void mdt_stack_pre_fini(const struct lu_env *env,
4142                            struct mdt_device *m, struct lu_device *top)
4143 {
4144         struct lustre_cfg_bufs  *bufs;
4145         struct lustre_cfg       *lcfg;
4146         struct mdt_thread_info  *info;
4147         ENTRY;
4148
4149         LASSERT(top);
4150
4151         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4152         LASSERT(info != NULL);
4153
4154         bufs = &info->mti_u.bufs;
4155
4156         LASSERT(m->mdt_child_exp);
4157         LASSERT(m->mdt_child_exp->exp_obd);
4158
4159         /* process cleanup, pass mdt obd name to get obd umount flags */
4160         /* XXX: this is needed because all layers are referenced by
4161          * objects (some of them are pinned by osd, for example *
4162          * the proper solution should be a model where object used
4163          * by osd only doesn't have mdt/mdd slices -bzzz */
4164         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4165         lustre_cfg_bufs_set_string(bufs, 1, NULL);
4166         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
4167         if (lcfg == NULL)
4168                 RETURN_EXIT;
4169
4170         top->ld_ops->ldo_process_config(env, top, lcfg);
4171         lustre_cfg_free(lcfg);
4172         EXIT;
4173 }
4174
4175 static void mdt_stack_fini(const struct lu_env *env,
4176                            struct mdt_device *m, struct lu_device *top)
4177 {
4178         struct obd_device       *obd = mdt2obd_dev(m);
4179         struct lustre_cfg_bufs  *bufs;
4180         struct lustre_cfg       *lcfg;
4181         struct mdt_thread_info  *info;
4182         char                     flags[3] = "";
4183         ENTRY;
4184
4185         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4186         LASSERT(info != NULL);
4187
4188         lu_dev_del_linkage(top->ld_site, top);
4189
4190         lu_site_purge(env, top->ld_site, -1);
4191
4192         bufs = &info->mti_u.bufs;
4193         /* process cleanup, pass mdt obd name to get obd umount flags */
4194         /* another purpose is to let all layers to release their objects */
4195         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4196         if (obd->obd_force)
4197                 strcat(flags, "F");
4198         if (obd->obd_fail)
4199                 strcat(flags, "A");
4200         lustre_cfg_bufs_set_string(bufs, 1, flags);
4201         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
4202         if (lcfg == NULL)
4203                 RETURN_EXIT;
4204
4205         LASSERT(top);
4206         top->ld_ops->ldo_process_config(env, top, lcfg);
4207         lustre_cfg_free(lcfg);
4208
4209         lu_site_purge(env, top->ld_site, -1);
4210
4211         m->mdt_child = NULL;
4212         m->mdt_bottom = NULL;
4213
4214         obd_disconnect(m->mdt_child_exp);
4215         m->mdt_child_exp = NULL;
4216
4217         obd_disconnect(m->mdt_bottom_exp);
4218         m->mdt_child_exp = NULL;
4219 }
4220
4221 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
4222                                const char *next, struct obd_export **exp)
4223 {
4224         struct obd_connect_data *data = NULL;
4225         struct obd_device       *obd;
4226         int                      rc;
4227         ENTRY;
4228
4229         OBD_ALLOC_PTR(data);
4230         if (data == NULL)
4231                 GOTO(out, rc = -ENOMEM);
4232
4233         obd = class_name2obd(next);
4234         if (obd == NULL) {
4235                 CERROR("%s: can't locate next device: %s\n",
4236                        mdt_obd_name(m), next);
4237                 GOTO(out, rc = -ENOTCONN);
4238         }
4239
4240         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4241         data->ocd_version = LUSTRE_VERSION_CODE;
4242
4243         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
4244         if (rc) {
4245                 CERROR("%s: cannot connect to next dev %s (%d)\n",
4246                        mdt_obd_name(m), next, rc);
4247                 GOTO(out, rc);
4248         }
4249
4250 out:
4251         if (data)
4252                 OBD_FREE_PTR(data);
4253         RETURN(rc);
4254 }
4255
4256 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
4257                           struct lustre_cfg *cfg)
4258 {
4259         char                   *dev = lustre_cfg_string(cfg, 0);
4260         int                     rc, name_size, uuid_size;
4261         char                   *name, *uuid, *p;
4262         struct lustre_cfg_bufs *bufs;
4263         struct lustre_cfg      *lcfg;
4264         struct obd_device      *obd;
4265         struct lustre_profile  *lprof;
4266         struct lu_site         *site;
4267         ENTRY;
4268
4269         /* in 1.8 we had the only device in the stack - MDS.
4270          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
4271          * in 2.3 OSD is instantiated by obd_mount.c, so we need
4272          * to generate names and setup MDT, MDD. MDT will be using
4273          * generated name to connect to MDD. for MDD the next device
4274          * will be LOD with name taken from so called "profile" which
4275          * is generated by mount_option line
4276          *
4277          * 1.8 MGS generates config. commands like this:
4278          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
4279          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
4280          * 2.0 MGS generates config. commands like this:
4281          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
4282          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4283          *                    3:lustre-MDT0000-mdtlov  4:f
4284          *
4285          * we generate MDD name from MDT one, just replacing T with D
4286          *
4287          * after all the preparations, the logical equivalent will be
4288          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
4289          *                    3:lustre-MDT0000-mdtlov  4:f
4290          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4291          *                    3:lustre-MDD0000  4:f
4292          *
4293          *  notice we build the stack from down to top: MDD first, then MDT */
4294
4295         name_size = MAX_OBD_NAME;
4296         uuid_size = MAX_OBD_NAME;
4297
4298         OBD_ALLOC(name, name_size);
4299         OBD_ALLOC(uuid, uuid_size);
4300         if (name == NULL || uuid == NULL)
4301                 GOTO(cleanup_mem, rc = -ENOMEM);
4302
4303         OBD_ALLOC_PTR(bufs);
4304         if (!bufs)
4305                 GOTO(cleanup_mem, rc = -ENOMEM);
4306
4307         strcpy(name, dev);
4308         p = strstr(name, "-MDT");
4309         if (p == NULL)
4310                 GOTO(free_bufs, rc = -ENOMEM);
4311         p[3] = 'D';
4312
4313         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
4314
4315         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4316         if (lprof == NULL || lprof->lp_dt == NULL) {
4317                 CERROR("can't find the profile: %s\n",
4318                        lustre_cfg_string(cfg, 0));
4319                 GOTO(free_bufs, rc = -EINVAL);
4320         }
4321
4322         lustre_cfg_bufs_reset(bufs, name);
4323         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
4324         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4325         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4326
4327         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4328         if (lcfg == NULL)
4329                 GOTO(put_profile, rc = -ENOMEM);
4330
4331         rc = class_attach(lcfg);
4332         if (rc)
4333                 GOTO(lcfg_cleanup, rc);
4334
4335         obd = class_name2obd(name);
4336         if (!obd) {
4337                 CERROR("Can not find obd %s (%s in config)\n",
4338                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
4339                 GOTO(lcfg_cleanup, rc = -EINVAL);
4340         }
4341
4342         lustre_cfg_free(lcfg);
4343
4344         lustre_cfg_bufs_reset(bufs, name);
4345         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4346         lustre_cfg_bufs_set_string(bufs, 2, dev);
4347         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4348
4349         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4350         if (lcfg == NULL)
4351                 GOTO(class_detach, rc = -ENOMEM);
4352
4353         rc = class_setup(obd, lcfg);
4354         if (rc)
4355                 GOTO(class_detach, rc);
4356
4357         /* connect to MDD we just setup */
4358         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
4359         if (rc)
4360                 GOTO(class_detach, rc);
4361
4362         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
4363         LASSERT(site);
4364         LASSERT(mdt_lu_site(mdt) == NULL);
4365         mdt->mdt_lu_dev.ld_site = site;
4366         site->ls_top_dev = &mdt->mdt_lu_dev;
4367         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
4368
4369         /* now connect to bottom OSD */
4370         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
4371         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
4372         if (rc)
4373                 GOTO(class_detach, rc);
4374         mdt->mdt_bottom =
4375                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
4376
4377         rc = lu_env_refill((struct lu_env *)env);
4378         if (rc != 0)
4379                 CERROR("Failure to refill session: '%d'\n", rc);
4380
4381         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
4382
4383         EXIT;
4384 class_detach:
4385         if (rc)
4386                 class_detach(obd, lcfg);
4387 lcfg_cleanup:
4388         lustre_cfg_free(lcfg);
4389 put_profile:
4390         class_put_profile(lprof);
4391 free_bufs:
4392         OBD_FREE_PTR(bufs);
4393 cleanup_mem:
4394         if (name)
4395                 OBD_FREE(name, name_size);
4396         if (uuid)
4397                 OBD_FREE(uuid, uuid_size);
4398         RETURN(rc);
4399 }
4400
4401 /* setup quota master target on MDT0 */
4402 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
4403                           struct lustre_cfg *cfg)
4404 {
4405         struct obd_device       *obd;
4406         char                    *dev = lustre_cfg_string(cfg, 0);
4407         char                    *qmtname, *uuid, *p;
4408         struct lustre_cfg_bufs  *bufs;
4409         struct lustre_cfg       *lcfg;
4410         struct lustre_profile   *lprof;
4411         struct obd_connect_data *data;
4412         int                      rc;
4413         ENTRY;
4414
4415         LASSERT(mdt->mdt_qmt_exp == NULL);
4416         LASSERT(mdt->mdt_qmt_dev == NULL);
4417
4418         /* quota master is on MDT0 only for now */
4419         if (mdt->mdt_seq_site.ss_node_id != 0)
4420                 RETURN(0);
4421
4422         /* MGS generates config commands which look as follows:
4423          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4424          *                    3:lustre-MDT0000-mdtlov  4:f
4425          *
4426          * We generate the QMT name from the MDT one, just replacing MD with QM
4427          * after all the preparations, the logical equivalent will be:
4428          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4429          *                    3:lustre-MDT0000-osd  4:f */
4430         OBD_ALLOC(qmtname, MAX_OBD_NAME);
4431         OBD_ALLOC(uuid, UUID_MAX);
4432         OBD_ALLOC_PTR(bufs);
4433         OBD_ALLOC_PTR(data);
4434         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
4435                 GOTO(cleanup_mem, rc = -ENOMEM);
4436
4437         strcpy(qmtname, dev);
4438         p = strstr(qmtname, "-MDT");
4439         if (p == NULL)
4440                 GOTO(cleanup_mem, rc = -ENOMEM);
4441         /* replace MD with QM */
4442         p[1] = 'Q';
4443         p[2] = 'M';
4444
4445         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4446
4447         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4448         if (lprof == NULL || lprof->lp_dt == NULL) {
4449                 CERROR("can't find profile for %s\n",
4450                        lustre_cfg_string(cfg, 0));
4451                 GOTO(cleanup_mem, rc = -EINVAL);
4452         }
4453
4454         lustre_cfg_bufs_reset(bufs, qmtname);
4455         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4456         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4457         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4458
4459         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4460         if (lcfg == NULL)
4461                 GOTO(put_profile, rc = -ENOMEM);
4462
4463         rc = class_attach(lcfg);
4464         if (rc)
4465                 GOTO(lcfg_cleanup, rc);
4466
4467         obd = class_name2obd(qmtname);
4468         if (!obd) {
4469                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4470                        lustre_cfg_string(cfg, 0));
4471                 GOTO(lcfg_cleanup, rc = -EINVAL);
4472         }
4473
4474         lustre_cfg_free(lcfg);
4475
4476         lustre_cfg_bufs_reset(bufs, qmtname);
4477         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4478         lustre_cfg_bufs_set_string(bufs, 2, dev);
4479
4480         /* for quota, the next device should be the OSD device */
4481         lustre_cfg_bufs_set_string(bufs, 3,
4482                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4483
4484         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4485         if (lcfg == NULL)
4486                 GOTO(class_detach, rc = -ENOMEM);
4487
4488         rc = class_setup(obd, lcfg);
4489         if (rc)
4490                 GOTO(class_detach, rc);
4491
4492         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4493
4494         /* configure local quota objects */
4495         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4496                                                    &mdt->mdt_lu_dev,
4497                                                    mdt->mdt_qmt_dev);
4498         if (rc)
4499                 GOTO(class_cleanup, rc);
4500
4501         /* connect to quota master target */
4502         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4503         data->ocd_version = LUSTRE_VERSION_CODE;
4504         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4505                          data, NULL);
4506         if (rc) {
4507                 CERROR("cannot connect to quota master device %s (%d)\n",
4508                        qmtname, rc);
4509                 GOTO(class_cleanup, rc);
4510         }
4511
4512         EXIT;
4513 class_cleanup:
4514         if (rc) {
4515                 class_manual_cleanup(obd);
4516                 mdt->mdt_qmt_dev = NULL;
4517         }
4518 class_detach:
4519         if (rc)
4520                 class_detach(obd, lcfg);
4521 lcfg_cleanup:
4522         lustre_cfg_free(lcfg);
4523 put_profile:
4524         class_put_profile(lprof);
4525 cleanup_mem:
4526         if (bufs)
4527                 OBD_FREE_PTR(bufs);
4528         if (qmtname)
4529                 OBD_FREE(qmtname, MAX_OBD_NAME);
4530         if (uuid)
4531                 OBD_FREE(uuid, UUID_MAX);
4532         if (data)
4533                 OBD_FREE_PTR(data);
4534         return rc;
4535 }
4536
4537 /* Shutdown quota master target associated with mdt */
4538 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4539 {
4540         ENTRY;
4541
4542         if (mdt->mdt_qmt_exp == NULL)
4543                 RETURN_EXIT;
4544         LASSERT(mdt->mdt_qmt_dev != NULL);
4545
4546         /* the qmt automatically shuts down when the mdt disconnects */
4547         obd_disconnect(mdt->mdt_qmt_exp);
4548         mdt->mdt_qmt_exp = NULL;
4549         mdt->mdt_qmt_dev = NULL;
4550         EXIT;
4551 }
4552
4553 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4554  * for now. This will be removed along with converting rest of MDT code
4555  * to use tgt_session_info */
4556 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4557 {
4558         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4559         int                      rc;
4560
4561         rc = mdt_getxattr(info);
4562
4563         mdt_thread_info_fini(info);
4564         return rc;
4565 }
4566
4567 static struct tgt_handler mdt_tgt_handlers[] = {
4568 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4569                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4570                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4571 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4572                 0,                      MDS_DISCONNECT, tgt_disconnect,
4573                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4574 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4575                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4576                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4577 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4578 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GET_ROOT,   mdt_get_root),
4579 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4580 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4581                                                         mdt_getattr_name),
4582 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4583 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4584 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4585 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4586 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4587 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4588 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4589 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4590                                                         mdt_hsm_progress),
4591 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4592                                                         mdt_hsm_ct_register),
4593 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4594                                                         mdt_hsm_ct_unregister),
4595 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4596                                                         mdt_hsm_state_get),
4597 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4598                                                         mdt_hsm_state_set),
4599 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4600 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4601                                                         mdt_hsm_request),
4602 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4603             MDS_SWAP_LAYOUTS,
4604             mdt_swap_layouts),
4605 };
4606
4607 static struct tgt_handler mdt_sec_ctx_ops[] = {
4608 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4609 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4610 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4611 };
4612
4613 static struct tgt_handler mdt_quota_ops[] = {
4614 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4615 };
4616
4617 static struct tgt_opc_slice mdt_common_slice[] = {
4618         {
4619                 .tos_opc_start  = MDS_FIRST_OPC,
4620                 .tos_opc_end    = MDS_LAST_OPC,
4621                 .tos_hs         = mdt_tgt_handlers
4622         },
4623         {
4624                 .tos_opc_start  = OBD_FIRST_OPC,
4625                 .tos_opc_end    = OBD_LAST_OPC,
4626                 .tos_hs         = tgt_obd_handlers
4627         },
4628         {
4629                 .tos_opc_start  = LDLM_FIRST_OPC,
4630                 .tos_opc_end    = LDLM_LAST_OPC,
4631                 .tos_hs         = tgt_dlm_handlers
4632         },
4633         {
4634                 .tos_opc_start  = SEC_FIRST_OPC,
4635                 .tos_opc_end    = SEC_LAST_OPC,
4636                 .tos_hs         = mdt_sec_ctx_ops
4637         },
4638         {
4639                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4640                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4641                 .tos_hs         = tgt_out_handlers
4642         },
4643         {
4644                 .tos_opc_start  = FLD_FIRST_OPC,
4645                 .tos_opc_end    = FLD_LAST_OPC,
4646                 .tos_hs         = fld_handlers
4647         },
4648         {
4649                 .tos_opc_start  = SEQ_FIRST_OPC,
4650                 .tos_opc_end    = SEQ_LAST_OPC,
4651                 .tos_hs         = seq_handlers
4652         },
4653         {
4654                 .tos_opc_start  = QUOTA_DQACQ,
4655                 .tos_opc_end    = QUOTA_LAST_OPC,
4656                 .tos_hs         = mdt_quota_ops
4657         },
4658         {
4659                 .tos_opc_start  = LLOG_FIRST_OPC,
4660                 .tos_opc_end    = LLOG_LAST_OPC,
4661                 .tos_hs         = tgt_llog_handlers
4662         },
4663         {
4664                 .tos_opc_start  = LFSCK_FIRST_OPC,
4665                 .tos_opc_end    = LFSCK_LAST_OPC,
4666                 .tos_hs         = tgt_lfsck_handlers
4667         },
4668
4669         {
4670                 .tos_hs         = NULL
4671         }
4672 };
4673
4674 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4675 {
4676         struct md_device *next = m->mdt_child;
4677         struct lu_device *d = &m->mdt_lu_dev;
4678         struct obd_device *obd = mdt2obd_dev(m);
4679         struct lfsck_stop stop;
4680
4681         ENTRY;
4682         stop.ls_status = LS_PAUSED;
4683         stop.ls_flags = 0;
4684         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4685
4686         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4687         ping_evictor_stop();
4688
4689         if (m->mdt_opts.mo_coordinator)
4690                 mdt_hsm_cdt_stop(m);
4691
4692         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4693         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4694
4695         if (m->mdt_namespace != NULL)
4696                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
4697                                           d->ld_obd->obd_force);
4698
4699         obd_exports_barrier(obd);
4700         obd_zombie_barrier();
4701
4702         mdt_quota_fini(env, m);
4703
4704         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
4705
4706         /* Calling the cleanup functions in the same order as in the mdt_init0
4707          * error path
4708          */
4709         mdt_procfs_fini(m);
4710
4711         target_recovery_fini(obd);
4712         upcall_cache_cleanup(m->mdt_identity_cache);
4713         m->mdt_identity_cache = NULL;
4714
4715         mdt_fs_cleanup(env, m);
4716
4717         tgt_fini(env, &m->mdt_lut);
4718
4719         mdt_hsm_cdt_fini(m);
4720
4721         if (m->mdt_namespace != NULL) {
4722                 ldlm_namespace_free_post(m->mdt_namespace);
4723                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4724         }
4725
4726         if (m->mdt_md_root != NULL) {
4727                 mdt_object_put(env, m->mdt_md_root);
4728                 m->mdt_md_root = NULL;
4729         }
4730
4731         mdt_seq_fini(env, m);
4732
4733         mdt_fld_fini(env, m);
4734
4735         /*
4736          * Finish the stack
4737          */
4738         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4739
4740         LASSERT(atomic_read(&d->ld_ref) == 0);
4741
4742         server_put_mount(mdt_obd_name(m), true);
4743
4744         EXIT;
4745 }
4746
4747 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4748
4749 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4750                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4751 {
4752         struct mdt_thread_info    *info;
4753         struct obd_device         *obd;
4754         const char                *dev = lustre_cfg_string(cfg, 0);
4755         const char                *num = lustre_cfg_string(cfg, 2);
4756         struct lustre_mount_info  *lmi = NULL;
4757         struct lustre_sb_info     *lsi;
4758         struct lu_site            *s;
4759         struct seq_server_site    *ss_site;
4760         const char                *identity_upcall = "NONE";
4761         struct md_device          *next;
4762         int                        rc;
4763         long                       node_id;
4764         mntopt_t                   mntopts;
4765         ENTRY;
4766
4767         lu_device_init(&m->mdt_lu_dev, ldt);
4768         /*
4769          * Environment (env) might be missing mdt_thread_key values at that
4770          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4771          * mode.
4772          *
4773          * Usually device allocation path doesn't use module key values, but
4774          * mdt has to do a lot of work here, so allocate key value.
4775          */
4776         rc = lu_env_refill((struct lu_env *)env);
4777         if (rc != 0)
4778                 RETURN(rc);
4779
4780         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4781         LASSERT(info != NULL);
4782
4783         obd = class_name2obd(dev);
4784         LASSERT(obd != NULL);
4785
4786         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4787         m->mdt_opts.mo_evict_tgt_nids = 1;
4788         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4789
4790         /* default is coordinator off, it is started through conf_param
4791          * or /proc */
4792         m->mdt_opts.mo_coordinator = 0;
4793
4794         lmi = server_get_mount(dev);
4795         if (lmi == NULL) {
4796                 CERROR("Cannot get mount info for %s!\n", dev);
4797                 RETURN(-EFAULT);
4798         } else {
4799                 lsi = s2lsi(lmi->lmi_sb);
4800                 /* CMD is supported only in IAM mode */
4801                 LASSERT(num);
4802                 node_id = simple_strtol(num, NULL, 10);
4803                 obd->u.obt.obt_magic = OBT_MAGIC;
4804                 if (lsi->lsi_lmd != NULL &&
4805                     lsi->lsi_lmd->lmd_flags & LMD_FLG_SKIP_LFSCK)
4806                         m->mdt_skip_lfsck = 1;
4807         }
4808
4809         m->mdt_squash.rsi_uid = 0;
4810         m->mdt_squash.rsi_gid = 0;
4811         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
4812         init_rwsem(&m->mdt_squash.rsi_sem);
4813         spin_lock_init(&m->mdt_lock);
4814         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4815         m->mdt_enable_remote_dir = 0;
4816         m->mdt_enable_remote_dir_gid = 0;
4817
4818         atomic_set(&m->mdt_mds_mds_conns, 0);
4819         atomic_set(&m->mdt_async_commit_count, 0);
4820
4821         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4822         m->mdt_lu_dev.ld_obd = obd;
4823         /* Set this lu_device to obd for error handling purposes. */
4824         obd->obd_lu_dev = &m->mdt_lu_dev;
4825
4826         /* init the stack */
4827         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4828         if (rc) {
4829                 CERROR("%s: Can't init device stack, rc %d\n",
4830                        mdt_obd_name(m), rc);
4831                 GOTO(err_lmi, rc);
4832         }
4833
4834         s = mdt_lu_site(m);
4835         ss_site = mdt_seq_site(m);
4836         s->ld_seq_site = ss_site;
4837         ss_site->ss_lu = s;
4838
4839         /* set server index */
4840         ss_site->ss_node_id = node_id;
4841
4842         /* failover is the default
4843          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4844          * assumed whose ss_node_id == 0 XXX
4845          * */
4846         obd->obd_replayable = 1;
4847         /* No connection accepted until configurations will finish */
4848         obd->obd_no_conn = 1;
4849
4850         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4851                 char *str = lustre_cfg_string(cfg, 4);
4852                 if (strchr(str, 'n')) {
4853                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4854                         obd->obd_replayable = 0;
4855                 }
4856         }
4857
4858         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4859         if (rc)
4860                 GOTO(err_fini_stack, rc);
4861
4862         rc = mdt_seq_init(env, m);
4863         if (rc)
4864                 GOTO(err_fini_fld, rc);
4865
4866         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4867                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4868         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4869                                               LDLM_NAMESPACE_SERVER,
4870                                               LDLM_NAMESPACE_GREEDY,
4871                                               LDLM_NS_TYPE_MDT);
4872         if (m->mdt_namespace == NULL)
4873                 GOTO(err_fini_seq, rc = -ENOMEM);
4874
4875         m->mdt_namespace->ns_lvbp = m;
4876         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4877
4878         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4879         /* set obd_namespace for compatibility with old code */
4880         obd->obd_namespace = m->mdt_namespace;
4881
4882         rc = mdt_hsm_cdt_init(m);
4883         if (rc != 0) {
4884                 CERROR("%s: error initializing coordinator, rc %d\n",
4885                        mdt_obd_name(m), rc);
4886                 GOTO(err_free_ns, rc);
4887         }
4888
4889         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4890                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4891                       OBD_FAIL_MDS_ALL_REPLY_NET);
4892         if (rc)
4893                 GOTO(err_free_hsm, rc);
4894
4895         rc = mdt_fs_setup(env, m, obd, lsi);
4896         if (rc)
4897                 GOTO(err_tgt, rc);
4898
4899         tgt_adapt_sptlrpc_conf(&m->mdt_lut);
4900
4901         next = m->mdt_child;
4902         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4903                                          &mntopts);
4904         if (rc)
4905                 GOTO(err_fs_cleanup, rc);
4906
4907         if (mntopts & MNTOPT_USERXATTR)
4908                 m->mdt_opts.mo_user_xattr = 1;
4909         else
4910                 m->mdt_opts.mo_user_xattr = 0;
4911
4912         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4913         if (rc)
4914                 GOTO(err_fs_cleanup, rc);
4915
4916         if (mntopts & MNTOPT_ACL)
4917                 m->mdt_opts.mo_acl = 1;
4918         else
4919                 m->mdt_opts.mo_acl = 0;
4920
4921         /* XXX: to support suppgid for ACL, we enable identity_upcall
4922          * by default, otherwise, maybe got unexpected -EACCESS. */
4923         if (m->mdt_opts.mo_acl)
4924                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4925
4926         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4927                                                 identity_upcall,
4928                                                 &mdt_identity_upcall_cache_ops);
4929         if (IS_ERR(m->mdt_identity_cache)) {
4930                 rc = PTR_ERR(m->mdt_identity_cache);
4931                 m->mdt_identity_cache = NULL;
4932                 GOTO(err_fs_cleanup, rc);
4933         }
4934
4935         rc = mdt_procfs_init(m, dev);
4936         if (rc) {
4937                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4938                 GOTO(err_recovery, rc);
4939         }
4940
4941         rc = mdt_quota_init(env, m, cfg);
4942         if (rc)
4943                 GOTO(err_procfs, rc);
4944
4945         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4946         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4947                            "mdt_ldlm_client", m->mdt_ldlm_client);
4948
4949         ping_evictor_start();
4950
4951         /* recovery will be started upon mdt_prepare()
4952          * when the whole stack is complete and ready
4953          * to serve the requests */
4954
4955         /* Reduce the initial timeout on an MDS because it doesn't need such
4956          * a long timeout as an OST does. Adaptive timeouts will adjust this
4957          * value appropriately. */
4958         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4959                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4960
4961         RETURN(0);
4962 err_procfs:
4963         mdt_procfs_fini(m);
4964 err_recovery:
4965         target_recovery_fini(obd);
4966         upcall_cache_cleanup(m->mdt_identity_cache);
4967         m->mdt_identity_cache = NULL;
4968 err_fs_cleanup:
4969         mdt_fs_cleanup(env, m);
4970 err_tgt:
4971         tgt_fini(env, &m->mdt_lut);
4972 err_free_hsm:
4973         mdt_hsm_cdt_fini(m);
4974 err_free_ns:
4975         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4976         obd->obd_namespace = m->mdt_namespace = NULL;
4977 err_fini_seq:
4978         mdt_seq_fini(env, m);
4979 err_fini_fld:
4980         mdt_fld_fini(env, m);
4981 err_fini_stack:
4982         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4983 err_lmi:
4984         if (lmi)
4985                 server_put_mount(dev, true);
4986         return(rc);
4987 }
4988
4989 /* For interoperability, the left element is old parameter, the right one
4990  * is the new version of the parameter, if some parameter is deprecated,
4991  * the new version should be set as NULL. */
4992 static struct cfg_interop_param mdt_interop_param[] = {
4993         { "mdt.group_upcall",   NULL },
4994         { "mdt.quota_type",     NULL },
4995         { "mdd.quota_type",     NULL },
4996         { "mdt.som",            NULL },
4997         { "mdt.rootsquash",     "mdt.root_squash" },
4998         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4999         { NULL }
5000 };
5001
5002 /* used by MGS to process specific configurations */
5003 static int mdt_process_config(const struct lu_env *env,
5004                               struct lu_device *d, struct lustre_cfg *cfg)
5005 {
5006         struct mdt_device *m = mdt_dev(d);
5007         struct md_device *md_next = m->mdt_child;
5008         struct lu_device *next = md2lu_dev(md_next);
5009         int rc;
5010         ENTRY;
5011
5012         switch (cfg->lcfg_command) {
5013         case LCFG_PARAM: {
5014                 struct obd_device          *obd = d->ld_obd;
5015
5016                 /* For interoperability */
5017                 struct cfg_interop_param   *ptr = NULL;
5018                 struct lustre_cfg          *old_cfg = NULL;
5019                 char                       *param = NULL;
5020
5021                 param = lustre_cfg_string(cfg, 1);
5022                 if (param == NULL) {
5023                         CERROR("param is empty\n");
5024                         rc = -EINVAL;
5025                         break;
5026                 }
5027
5028                 ptr = class_find_old_param(param, mdt_interop_param);
5029                 if (ptr != NULL) {
5030                         if (ptr->new_param == NULL) {
5031                                 rc = 0;
5032                                 CWARN("For interoperability, skip this %s."
5033                                       " It is obsolete.\n", ptr->old_param);
5034                                 break;
5035                         }
5036
5037                         CWARN("Found old param %s, changed it to %s.\n",
5038                               ptr->old_param, ptr->new_param);
5039
5040                         old_cfg = cfg;
5041                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
5042                         if (IS_ERR(cfg)) {
5043                                 rc = PTR_ERR(cfg);
5044                                 break;
5045                         }
5046                 }
5047
5048                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
5049                                               cfg, obd);
5050                 if (rc > 0 || rc == -ENOSYS) {
5051                         /* is it an HSM var ? */
5052                         rc = class_process_proc_param(PARAM_HSM,
5053                                                       hsm_cdt_get_proc_vars(),
5054                                                       cfg, obd);
5055                         if (rc > 0 || rc == -ENOSYS)
5056                                 /* we don't understand; pass it on */
5057                                 rc = next->ld_ops->ldo_process_config(env, next,
5058                                                                       cfg);
5059                 }
5060
5061                 if (old_cfg != NULL)
5062                         lustre_cfg_free(cfg);
5063
5064                 break;
5065         }
5066         default:
5067                 /* others are passed further */
5068                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
5069                 break;
5070         }
5071         RETURN(rc);
5072 }
5073
5074 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
5075                                           const struct lu_object_header *hdr,
5076                                           struct lu_device *d)
5077 {
5078         struct mdt_object *mo;
5079
5080         ENTRY;
5081
5082         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
5083         if (mo != NULL) {
5084                 struct lu_object *o;
5085                 struct lu_object_header *h;
5086
5087                 o = &mo->mot_obj;
5088                 h = &mo->mot_header;
5089                 lu_object_header_init(h);
5090                 lu_object_init(o, h, d);
5091                 lu_object_add_top(h, o);
5092                 o->lo_ops = &mdt_obj_ops;
5093                 spin_lock_init(&mo->mot_write_lock);
5094                 mutex_init(&mo->mot_lov_mutex);
5095                 init_rwsem(&mo->mot_open_sem);
5096                 atomic_set(&mo->mot_open_count, 0);
5097                 RETURN(o);
5098         }
5099         RETURN(NULL);
5100 }
5101
5102 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
5103                            const struct lu_object_conf *unused)
5104 {
5105         struct mdt_device *d = mdt_dev(o->lo_dev);
5106         struct lu_device  *under;
5107         struct lu_object  *below;
5108         int                rc = 0;
5109         ENTRY;
5110
5111         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
5112                PFID(lu_object_fid(o)));
5113
5114         under = &d->mdt_child->md_lu_dev;
5115         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
5116         if (below != NULL) {
5117                 lu_object_add(o, below);
5118         } else
5119                 rc = -ENOMEM;
5120
5121         RETURN(rc);
5122 }
5123
5124 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
5125 {
5126         struct mdt_object *mo = mdt_obj(o);
5127         struct lu_object_header *h;
5128         ENTRY;
5129
5130         h = o->lo_header;
5131         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
5132                PFID(lu_object_fid(o)));
5133
5134         LASSERT(atomic_read(&mo->mot_open_count) == 0);
5135         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
5136
5137         lu_object_fini(o);
5138         lu_object_header_fini(h);
5139         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
5140
5141         EXIT;
5142 }
5143
5144 static int mdt_object_print(const struct lu_env *env, void *cookie,
5145                             lu_printer_t p, const struct lu_object *o)
5146 {
5147         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
5148
5149         return (*p)(env, cookie,
5150                     LUSTRE_MDT_NAME"-object@%p(%s %s, writecount=%d)",
5151                     mdto, mdto->mot_lov_created ? "lov_created" : "",
5152                     mdto->mot_cache_attr ? "cache_attr" : "",
5153                     mdto->mot_write_count);
5154 }
5155
5156 static int mdt_prepare(const struct lu_env *env,
5157                 struct lu_device *pdev,
5158                 struct lu_device *cdev)
5159 {
5160         struct mdt_device *mdt = mdt_dev(cdev);
5161         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
5162         struct obd_device *obd = cdev->ld_obd;
5163         int rc;
5164
5165         ENTRY;
5166
5167         LASSERT(obd);
5168
5169         rc = next->ld_ops->ldo_prepare(env, cdev, next);
5170         if (rc)
5171                 RETURN(rc);
5172
5173         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
5174         if (rc)
5175                 RETURN(rc);
5176
5177         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
5178         if (rc)
5179                 RETURN(rc);
5180
5181         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
5182         /* The LFSCK instance is registered just now, so it must be there when
5183          * register the namespace to such instance. */
5184         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
5185
5186         if (mdt->mdt_seq_site.ss_node_id == 0) {
5187                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
5188                                                          &mdt->mdt_md_root_fid);
5189                 if (rc)
5190                         RETURN(rc);
5191         }
5192
5193         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
5194
5195         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
5196         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
5197         LASSERT(obd->obd_no_conn);
5198         spin_lock(&obd->obd_dev_lock);
5199         obd->obd_no_conn = 0;
5200         spin_unlock(&obd->obd_dev_lock);
5201
5202         if (obd->obd_recovering == 0)
5203                 mdt_postrecov(env, mdt);
5204
5205         RETURN(rc);
5206 }
5207
5208 const struct lu_device_operations mdt_lu_ops = {
5209         .ldo_object_alloc   = mdt_object_alloc,
5210         .ldo_process_config = mdt_process_config,
5211         .ldo_prepare        = mdt_prepare,
5212 };
5213
5214 static const struct lu_object_operations mdt_obj_ops = {
5215         .loo_object_init    = mdt_object_init,
5216         .loo_object_free    = mdt_object_free,
5217         .loo_object_print   = mdt_object_print
5218 };
5219
5220 static int mdt_obd_set_info_async(const struct lu_env *env,
5221                                   struct obd_export *exp,
5222                                   __u32 keylen, void *key,
5223                                   __u32 vallen, void *val,
5224                                   struct ptlrpc_request_set *set)
5225 {
5226         int rc;
5227
5228         ENTRY;
5229
5230         if (KEY_IS(KEY_SPTLRPC_CONF)) {
5231                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp));
5232                 RETURN(rc);
5233         }
5234
5235         RETURN(0);
5236 }
5237
5238 /**
5239  * Match client and server connection feature flags.
5240  *
5241  * Compute the compatibility flags for a connection request based on
5242  * features mutually supported by client and server.
5243  *
5244  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
5245  * must not be updated here, otherwise a partially initialized value may
5246  * be exposed. After the connection request is successfully processed,
5247  * the top-level MDT connect request handler atomically updates the export
5248  * connect flags from the obd_connect_data::ocd_connect_flags field of the
5249  * reply. \see mdt_connect().
5250  *
5251  * Before 2.7.50 clients will send a struct obd_connect_data_v1 rather than a
5252  * full struct obd_connect_data. So care must be taken when accessing fields
5253  * that are not present in struct obd_connect_data_v1. See LU-16.
5254  *
5255  * \param exp   the obd_export associated with this client/target pair
5256  * \param mdt   the target device for the connection
5257  * \param data  stores data for this connect request
5258  *
5259  * \retval 0       success
5260  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
5261  * \retval -EBADE  client and server feature requirements are incompatible
5262  */
5263 static int mdt_connect_internal(struct obd_export *exp,
5264                                 struct mdt_device *mdt,
5265                                 struct obd_connect_data *data)
5266 {
5267         LASSERT(data != NULL);
5268
5269         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
5270
5271         if (mdt->mdt_bottom->dd_rdonly &&
5272             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5273             !(data->ocd_connect_flags & OBD_CONNECT_RDONLY))
5274                 RETURN(-EACCES);
5275
5276         if (data->ocd_connect_flags & OBD_CONNECT_FLAGS2)
5277                 data->ocd_connect_flags2 &= MDT_CONNECT_SUPPORTED2;
5278
5279         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
5280
5281         if (!(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5282             !(data->ocd_connect_flags & OBD_CONNECT_IBITS)) {
5283                 CWARN("%s: client %s does not support ibits lock, either "
5284                       "very old or an invalid client: flags %#llx\n",
5285                       mdt_obd_name(mdt), exp->exp_client_uuid.uuid,
5286                       data->ocd_connect_flags);
5287                 return -EBADE;
5288         }
5289
5290         if (!mdt->mdt_opts.mo_acl)
5291                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
5292
5293         if (!mdt->mdt_opts.mo_user_xattr)
5294                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
5295
5296         if (OCD_HAS_FLAG(data, BRW_SIZE)) {
5297                 data->ocd_brw_size = min(data->ocd_brw_size, MD_MAX_BRW_SIZE);
5298                 if (data->ocd_brw_size == 0) {
5299                         CERROR("%s: cli %s/%p ocd_connect_flags: %#llx "
5300                                "ocd_version: %x ocd_grant: %d ocd_index: %u "
5301                                "ocd_brw_size unexpectedly zero, network data "
5302                                "corruption? Refusing to connect this client\n",
5303                                mdt_obd_name(mdt),
5304                                exp->exp_client_uuid.uuid,
5305                                exp, data->ocd_connect_flags, data->ocd_version,
5306                                data->ocd_grant, data->ocd_index);
5307                         return -EPROTO;
5308                 }
5309         }
5310
5311         /* NB: Disregard the rule against updating
5312          * exp_connect_data.ocd_connect_flags in this case, since
5313          * tgt_client_new() needs to know if this is a lightweight
5314          * connection, and it is safe to expose this flag before
5315          * connection processing completes. */
5316         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
5317                 spin_lock(&exp->exp_lock);
5318                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
5319                 spin_unlock(&exp->exp_lock);
5320         }
5321
5322         data->ocd_version = LUSTRE_VERSION_CODE;
5323
5324         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
5325                 CWARN("%s: MDS requires FID support, but client not\n",
5326                       mdt_obd_name(mdt));
5327                 return -EBADE;
5328         }
5329
5330         if (OCD_HAS_FLAG(data, PINGLESS)) {
5331                 if (ptlrpc_pinger_suppress_pings()) {
5332                         spin_lock(&exp->exp_obd->obd_dev_lock);
5333                         list_del_init(&exp->exp_obd_chain_timed);
5334                         spin_unlock(&exp->exp_obd->obd_dev_lock);
5335                 } else {
5336                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
5337                 }
5338         }
5339
5340         data->ocd_max_easize = mdt->mdt_max_ea_size;
5341
5342         /* NB: Disregard the rule against updating
5343          * exp_connect_data.ocd_connect_flags in this case, since
5344          * tgt_client_new() needs to know if this is client supports
5345          * multiple modify RPCs, and it is safe to expose this flag before
5346          * connection processing completes. */
5347         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
5348                 data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
5349                 spin_lock(&exp->exp_lock);
5350                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
5351                 spin_unlock(&exp->exp_lock);
5352         }
5353
5354         return 0;
5355 }
5356
5357 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
5358                                    struct mdt_thread_info *info,
5359                                    struct mdt_file_data *mfd)
5360 {
5361         struct lu_context ses;
5362         int rc;
5363         ENTRY;
5364
5365         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
5366         if (rc)
5367                 RETURN(rc);
5368
5369         env->le_ses = &ses;
5370         lu_context_enter(&ses);
5371
5372         mdt_ucred(info)->uc_valid = UCRED_OLD;
5373         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
5374
5375         lu_context_exit(&ses);
5376         lu_context_fini(&ses);
5377         env->le_ses = NULL;
5378
5379         RETURN(rc);
5380 }
5381
5382 static int mdt_export_cleanup(struct obd_export *exp)
5383 {
5384         struct list_head         closing_list;
5385         struct mdt_export_data  *med = &exp->exp_mdt_data;
5386         struct obd_device       *obd = exp->exp_obd;
5387         struct mdt_device       *mdt;
5388         struct mdt_thread_info  *info;
5389         struct lu_env            env;
5390         struct mdt_file_data    *mfd, *n;
5391         int rc = 0;
5392         ENTRY;
5393
5394         INIT_LIST_HEAD(&closing_list);
5395         spin_lock(&med->med_open_lock);
5396         while (!list_empty(&med->med_open_head)) {
5397                 struct list_head *tmp = med->med_open_head.next;
5398                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
5399
5400                 /* Remove mfd handle so it can't be found again.
5401                  * We are consuming the mfd_list reference here. */
5402                 class_handle_unhash(&mfd->mfd_handle);
5403                 list_move_tail(&mfd->mfd_list, &closing_list);
5404         }
5405         spin_unlock(&med->med_open_lock);
5406         mdt = mdt_dev(obd->obd_lu_dev);
5407         LASSERT(mdt != NULL);
5408
5409         rc = lu_env_init(&env, LCT_MD_THREAD);
5410         if (rc)
5411                 RETURN(rc);
5412
5413         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5414         LASSERT(info != NULL);
5415         memset(info, 0, sizeof *info);
5416         info->mti_env = &env;
5417         info->mti_mdt = mdt;
5418         info->mti_exp = exp;
5419
5420         if (!list_empty(&closing_list)) {
5421                 struct md_attr *ma = &info->mti_attr;
5422
5423                 /* Close any open files (which may also cause orphan
5424                  * unlinking). */
5425                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
5426                         list_del_init(&mfd->mfd_list);
5427                         ma->ma_need = ma->ma_valid = 0;
5428
5429                         /* This file is being closed due to an eviction, it
5430                          * could have been modified and now dirty regarding to
5431                          * HSM archive, check this!
5432                          * The logic here is to mark a file dirty if there's a
5433                          * chance it was dirtied before the client was evicted,
5434                          * so that we don't have to wait for a release attempt
5435                          * before finding out the file was actually dirty and
5436                          * fail the release. Aggressively marking it dirty here
5437                          * will cause the policy engine to attempt to
5438                          * re-archive it; when rearchiving, we can compare the
5439                          * current version to the HSM data_version and make the
5440                          * archive request into a noop if it's not actually
5441                          * dirty.
5442                          */
5443                         if (mfd->mfd_mode & FMODE_WRITE)
5444                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
5445
5446                         /* Don't unlink orphan on failover umount, LU-184 */
5447                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
5448                                 ma->ma_valid = MA_FLAGS;
5449                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
5450                         }
5451                         mdt_mfd_close(info, mfd);
5452                 }
5453         }
5454         info->mti_mdt = NULL;
5455         /* cleanup client slot early */
5456         /* Do not erase record for recoverable client. */
5457         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
5458                 tgt_client_del(&env, exp);
5459         lu_env_fini(&env);
5460
5461         RETURN(rc);
5462 }
5463
5464 static inline void mdt_enable_slc(struct mdt_device *mdt)
5465 {
5466         if (mdt->mdt_lut.lut_sync_lock_cancel == NEVER_SYNC_ON_CANCEL)
5467                 mdt->mdt_lut.lut_sync_lock_cancel = BLOCKING_SYNC_ON_CANCEL;
5468 }
5469
5470 static inline void mdt_disable_slc(struct mdt_device *mdt)
5471 {
5472         if (mdt->mdt_lut.lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL)
5473                 mdt->mdt_lut.lut_sync_lock_cancel = NEVER_SYNC_ON_CANCEL;
5474 }
5475
5476 static int mdt_obd_disconnect(struct obd_export *exp)
5477 {
5478         int rc;
5479         ENTRY;
5480
5481         LASSERT(exp);
5482         class_export_get(exp);
5483
5484         if ((exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) &&
5485             !(exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)) {
5486                 struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
5487
5488                 if (atomic_dec_and_test(&mdt->mdt_mds_mds_conns))
5489                         mdt_disable_slc(mdt);
5490         }
5491
5492         rc = server_disconnect_export(exp);
5493         if (rc != 0)
5494                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
5495
5496         rc = mdt_export_cleanup(exp);
5497         nodemap_del_member(exp);
5498         class_export_put(exp);
5499         RETURN(rc);
5500 }
5501
5502 /* mds_connect copy */
5503 static int mdt_obd_connect(const struct lu_env *env,
5504                            struct obd_export **exp, struct obd_device *obd,
5505                            struct obd_uuid *cluuid,
5506                            struct obd_connect_data *data,
5507                            void *localdata)
5508 {
5509         struct obd_export       *lexp;
5510         struct lustre_handle    conn = { 0 };
5511         struct mdt_device       *mdt;
5512         int                      rc;
5513         lnet_nid_t              *client_nid = localdata;
5514         ENTRY;
5515
5516         LASSERT(env != NULL);
5517         LASSERT(data != NULL);
5518
5519         if (!exp || !obd || !cluuid)
5520                 RETURN(-EINVAL);
5521
5522         mdt = mdt_dev(obd->obd_lu_dev);
5523
5524         if ((data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5525             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5526                 atomic_inc(&mdt->mdt_mds_mds_conns);
5527                 mdt_enable_slc(mdt);
5528         }
5529
5530         /*
5531          * first, check whether the stack is ready to handle requests
5532          * XXX: probably not very appropriate method is used now
5533          *      at some point we should find a better one
5534          */
5535         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) &&
5536             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
5537             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
5538                 rc = obd_get_info(env, mdt->mdt_child_exp,
5539                                   sizeof(KEY_OSP_CONNECTED),
5540                                   KEY_OSP_CONNECTED, NULL, NULL);
5541                 if (rc)
5542                         RETURN(-EAGAIN);
5543                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5544         }
5545
5546         rc = class_connect(&conn, obd, cluuid);
5547         if (rc)
5548                 RETURN(rc);
5549
5550         lexp = class_conn2export(&conn);
5551         LASSERT(lexp != NULL);
5552
5553         rc = nodemap_add_member(*client_nid, lexp);
5554         if (rc != 0 && rc != -EEXIST)
5555                 GOTO(out, rc);
5556
5557         rc = mdt_connect_internal(lexp, mdt, data);
5558         if (rc == 0) {
5559                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5560
5561                 LASSERT(lcd);
5562                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5563                 rc = tgt_client_new(env, lexp);
5564                 if (rc == 0)
5565                         mdt_export_stats_init(obd, lexp, localdata);
5566         }
5567 out:
5568         if (rc != 0) {
5569                 class_disconnect(lexp);
5570                 nodemap_del_member(lexp);
5571                 *exp = NULL;
5572         } else {
5573                 *exp = lexp;
5574                 /* Because we do not want this export to be evicted by pinger,
5575                  * let's not add this export to the timed chain list. */
5576                 if (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
5577                         spin_lock(&lexp->exp_obd->obd_dev_lock);
5578                         list_del_init(&lexp->exp_obd_chain_timed);
5579                         spin_unlock(&lexp->exp_obd->obd_dev_lock);
5580                 }
5581         }
5582
5583         RETURN(rc);
5584 }
5585
5586 static int mdt_obd_reconnect(const struct lu_env *env,
5587                              struct obd_export *exp, struct obd_device *obd,
5588                              struct obd_uuid *cluuid,
5589                              struct obd_connect_data *data,
5590                              void *localdata)
5591 {
5592         lnet_nid_t             *client_nid = localdata;
5593         int                     rc;
5594         ENTRY;
5595
5596         if (exp == NULL || obd == NULL || cluuid == NULL)
5597                 RETURN(-EINVAL);
5598
5599         rc = nodemap_add_member(*client_nid, exp);
5600         if (rc != 0 && rc != -EEXIST)
5601                 RETURN(rc);
5602
5603         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5604         if (rc == 0)
5605                 mdt_export_stats_init(obd, exp, localdata);
5606         else
5607                 nodemap_del_member(exp);
5608
5609         RETURN(rc);
5610 }
5611
5612 /* FIXME: Can we avoid using these two interfaces? */
5613 static int mdt_init_export(struct obd_export *exp)
5614 {
5615         struct mdt_export_data *med = &exp->exp_mdt_data;
5616         int                     rc;
5617         ENTRY;
5618
5619         INIT_LIST_HEAD(&med->med_open_head);
5620         spin_lock_init(&med->med_open_lock);
5621         spin_lock(&exp->exp_lock);
5622         exp->exp_connecting = 1;
5623         spin_unlock(&exp->exp_lock);
5624
5625         /* self-export doesn't need client data and ldlm initialization */
5626         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5627                                      &exp->exp_client_uuid)))
5628                 RETURN(0);
5629
5630         rc = tgt_client_alloc(exp);
5631         if (rc)
5632                 GOTO(err, rc);
5633
5634         rc = ldlm_init_export(exp);
5635         if (rc)
5636                 GOTO(err_free, rc);
5637
5638         RETURN(rc);
5639
5640 err_free:
5641         tgt_client_free(exp);
5642 err:
5643         CERROR("%s: Failed to initialize export: rc = %d\n",
5644                exp->exp_obd->obd_name, rc);
5645         return rc;
5646 }
5647
5648 static int mdt_destroy_export(struct obd_export *exp)
5649 {
5650         ENTRY;
5651
5652         target_destroy_export(exp);
5653         /* destroy can be called from failed obd_setup, so
5654          * checking uuid is safer than obd_self_export */
5655         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5656                                      &exp->exp_client_uuid)))
5657                 RETURN(0);
5658
5659         ldlm_destroy_export(exp);
5660         tgt_client_free(exp);
5661
5662         LASSERT(list_empty(&exp->exp_outstanding_replies));
5663         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
5664
5665         RETURN(0);
5666 }
5667
5668 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5669                    struct linkea_data *ldata)
5670 {
5671         int rc;
5672
5673         LASSERT(ldata->ld_buf->lb_buf != NULL);
5674
5675         if (!mdt_object_exists(mdt_obj))
5676                 return -ENODATA;
5677
5678         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5679                           ldata->ld_buf, XATTR_NAME_LINK);
5680         if (rc == -ERANGE) {
5681                 /* Buf was too small, figure out what we need. */
5682                 lu_buf_free(ldata->ld_buf);
5683                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5684                                   ldata->ld_buf, XATTR_NAME_LINK);
5685                 if (rc < 0)
5686                         return rc;
5687                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5688                 if (ldata->ld_buf->lb_buf == NULL)
5689                         return -ENOMEM;
5690                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5691                                   ldata->ld_buf, XATTR_NAME_LINK);
5692         }
5693         if (rc < 0)
5694                 return rc;
5695
5696         return linkea_init_with_rec(ldata);
5697 }
5698
5699 /**
5700  * Given an MDT object, try to look up the full path to the object.
5701  * Part of the MDT layer implementation of lfs fid2path.
5702  *
5703  * \param[in]     info  Per-thread common data shared by MDT level handlers.
5704  * \param[in]     obj   Object to do path lookup of
5705  * \param[in,out] fp    User-provided struct to store path information
5706  * \param[in]     root_fid Root FID of current path should reach
5707  *
5708  * \retval 0 Lookup successful, path information stored in fp
5709  * \retval -EAGAIN Lookup failed, usually because object is being moved
5710  * \retval negative errno if there was a problem
5711  */
5712 static int mdt_path_current(struct mdt_thread_info *info,
5713                             struct mdt_object *obj,
5714                             struct getinfo_fid2path *fp,
5715                             struct lu_fid *root_fid)
5716 {
5717         struct mdt_device       *mdt = info->mti_mdt;
5718         struct mdt_object       *mdt_obj;
5719         struct link_ea_header   *leh;
5720         struct link_ea_entry    *lee;
5721         struct lu_name          *tmpname = &info->mti_name;
5722         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5723         struct lu_buf           *buf = &info->mti_big_buf;
5724         char                    *ptr;
5725         int                     reclen;
5726         struct linkea_data      ldata = { NULL };
5727         int                     rc = 0;
5728         bool                    first = true;
5729         ENTRY;
5730
5731         /* temp buffer for path element, the buffer will be finally freed
5732          * in mdt_thread_info_fini */
5733         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5734         if (buf->lb_buf == NULL)
5735                 RETURN(-ENOMEM);
5736
5737         ldata.ld_buf = buf;
5738         ptr = fp->gf_u.gf_path + fp->gf_pathlen - 1;
5739         *ptr = 0;
5740         --ptr;
5741         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
5742
5743         while (!lu_fid_eq(root_fid, &fp->gf_fid)) {
5744                 struct lu_buf           lmv_buf;
5745
5746                 if (!lu_fid_eq(root_fid, &mdt->mdt_md_root_fid) &&
5747                     lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid))
5748                         GOTO(out, rc = -ENOENT);
5749
5750                 if (lu_fid_eq(mdt_object_fid(obj), tmpfid)) {
5751                         mdt_obj = obj;
5752                         mdt_object_get(info->mti_env, mdt_obj);
5753                 } else {
5754                         mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
5755                         if (IS_ERR(mdt_obj))
5756                                 GOTO(out, rc = PTR_ERR(mdt_obj));
5757                 }
5758
5759                 if (!mdt_object_exists(mdt_obj)) {
5760                         mdt_object_put(info->mti_env, mdt_obj);
5761                         GOTO(out, rc = -ENOENT);
5762                 }
5763
5764                 if (mdt_object_remote(mdt_obj)) {
5765                         mdt_object_put(info->mti_env, mdt_obj);
5766                         GOTO(remote_out, rc = -EREMOTE);
5767                 }
5768
5769                 rc = mdt_links_read(info, mdt_obj, &ldata);
5770                 if (rc != 0) {
5771                         mdt_object_put(info->mti_env, mdt_obj);
5772                         GOTO(out, rc);
5773                 }
5774
5775                 leh = buf->lb_buf;
5776                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5777                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5778                 /* If set, use link #linkno for path lookup, otherwise use
5779                    link #0.  Only do this for the final path element. */
5780                 if (first && fp->gf_linkno < leh->leh_reccount) {
5781                         int count;
5782                         for (count = 0; count < fp->gf_linkno; count++) {
5783                                 lee = (struct link_ea_entry *)
5784                                      ((char *)lee + reclen);
5785                                 linkea_entry_unpack(lee, &reclen, tmpname,
5786                                                     tmpfid);
5787                         }
5788                         if (fp->gf_linkno < leh->leh_reccount - 1)
5789                                 /* indicate to user there are more links */
5790                                 fp->gf_linkno++;
5791                 }
5792
5793                 lmv_buf.lb_buf = info->mti_xattr_buf;
5794                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
5795                 /* Check if it is slave stripes */
5796                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5797                                   &lmv_buf, XATTR_NAME_LMV);
5798                 mdt_object_put(info->mti_env, mdt_obj);
5799                 if (rc > 0) {
5800                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
5801
5802                         /* For slave stripes, get its master */
5803                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
5804                                 fp->gf_fid = *tmpfid;
5805                                 continue;
5806                         }
5807                 } else if (rc < 0 && rc != -ENODATA) {
5808                         GOTO(out, rc);
5809                 }
5810
5811                 rc = 0;
5812
5813                 /* Pack the name in the end of the buffer */
5814                 ptr -= tmpname->ln_namelen;
5815                 if (ptr - 1 <= fp->gf_u.gf_path)
5816                         GOTO(out, rc = -EOVERFLOW);
5817                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5818                 *(--ptr) = '/';
5819
5820                 /* keep the last resolved fid to the client, so the
5821                  * client will build the left path on another MDT for
5822                  * remote object */
5823                 fp->gf_fid = *tmpfid;
5824
5825                 first = false;
5826         }
5827
5828 remote_out:
5829         ptr++; /* skip leading / */
5830         memmove(fp->gf_u.gf_path, ptr,
5831                 fp->gf_u.gf_path + fp->gf_pathlen - ptr);
5832
5833 out:
5834         RETURN(rc);
5835 }
5836
5837 /**
5838  * Given an MDT object, use mdt_path_current to get the path.
5839  * Essentially a wrapper to retry mdt_path_current a set number of times
5840  * if -EAGAIN is returned (usually because an object is being moved).
5841  *
5842  * Part of the MDT layer implementation of lfs fid2path.
5843  *
5844  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5845  * \param[in]     obj   Object to do path lookup of
5846  * \param[in,out] fp    User-provided struct for arguments and to store path
5847  *                      information
5848  *
5849  * \retval 0 Lookup successful, path information stored in fp
5850  * \retval negative errno if there was a problem
5851  */
5852 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5853                     struct getinfo_fid2path *fp, struct lu_fid *root_fid)
5854 {
5855         struct mdt_device       *mdt = info->mti_mdt;
5856         int                     tries = 3;
5857         int                     rc = -EAGAIN;
5858         ENTRY;
5859
5860         if (fp->gf_pathlen < 3)
5861                 RETURN(-EOVERFLOW);
5862
5863         if (root_fid == NULL)
5864                 root_fid = &mdt->mdt_md_root_fid;
5865
5866         if (lu_fid_eq(root_fid, mdt_object_fid(obj))) {
5867                 fp->gf_u.gf_path[0] = '\0';
5868                 RETURN(0);
5869         }
5870
5871         /* Retry multiple times in case file is being moved */
5872         while (tries-- && rc == -EAGAIN)
5873                 rc = mdt_path_current(info, obj, fp, root_fid);
5874
5875         RETURN(rc);
5876 }
5877
5878 /**
5879  * Get the full path of the provided FID, as of changelog record recno.
5880  *
5881  * This checks sanity and looks up object for user provided FID
5882  * before calling the actual path lookup code.
5883  *
5884  * Part of the MDT layer implementation of lfs fid2path.
5885  *
5886  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5887  * \param[in,out] fp    User-provided struct for arguments and to store path
5888  *                      information
5889  *
5890  * \retval 0 Lookup successful, path information and recno stored in fp
5891  * \retval -ENOENT, object does not exist
5892  * \retval negative errno if there was a problem
5893  */
5894 static int mdt_fid2path(struct mdt_thread_info *info,
5895                         struct lu_fid *root_fid,
5896                         struct getinfo_fid2path *fp)
5897 {
5898         struct mdt_device *mdt = info->mti_mdt;
5899         struct mdt_object *obj;
5900         int    rc;
5901         ENTRY;
5902
5903         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
5904                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5905
5906         if (!fid_is_sane(&fp->gf_fid))
5907                 RETURN(-EINVAL);
5908
5909         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5910                 CDEBUG(D_INFO, "%s: "DFID" is invalid, f_seq should be >= %#llx"
5911                        ", or f_oid != 0, or f_ver == 0\n", mdt_obd_name(mdt),
5912                        PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5913                 RETURN(-EINVAL);
5914         }
5915
5916         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5917         if (IS_ERR(obj)) {
5918                 rc = PTR_ERR(obj);
5919                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
5920                        PFID(&fp->gf_fid), rc);
5921                 RETURN(rc);
5922         }
5923
5924         if (mdt_object_remote(obj))
5925                 rc = -EREMOTE;
5926         else if (!mdt_object_exists(obj))
5927                 rc = -ENOENT;
5928         else
5929                 rc = 0;
5930
5931         if (rc < 0) {
5932                 mdt_object_put(info->mti_env, obj);
5933                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
5934                        PFID(&fp->gf_fid), rc);
5935                 RETURN(rc);
5936         }
5937
5938         rc = mdt_path(info, obj, fp, root_fid);
5939
5940         CDEBUG(D_INFO, "fid "DFID", path %s recno %#llx linkno %u\n",
5941                PFID(&fp->gf_fid), fp->gf_u.gf_path,
5942                fp->gf_recno, fp->gf_linkno);
5943
5944         mdt_object_put(info->mti_env, obj);
5945
5946         RETURN(rc);
5947 }
5948
5949 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key, int keylen,
5950                             void *val, int vallen)
5951 {
5952         struct getinfo_fid2path *fpout, *fpin;
5953         struct lu_fid *root_fid = NULL;
5954         int rc = 0;
5955
5956         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5957         fpout = val;
5958
5959         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5960                 lustre_swab_fid2path(fpin);
5961
5962         memcpy(fpout, fpin, sizeof(*fpin));
5963         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5964                 RETURN(-EINVAL);
5965
5966         if (keylen >= cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*fpin) +
5967                       sizeof(struct lu_fid)) {
5968                 /* client sent its root FID, which is normally fileset FID */
5969                 root_fid = fpin->gf_u.gf_root_fid;
5970                 if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5971                         lustre_swab_lu_fid(root_fid);
5972
5973                 if (root_fid != NULL && !fid_is_sane(root_fid))
5974                         RETURN(-EINVAL);
5975         }
5976
5977         rc = mdt_fid2path(info, root_fid, fpout);
5978         RETURN(rc);
5979 }
5980
5981 int mdt_get_info(struct tgt_session_info *tsi)
5982 {
5983         char    *key;
5984         int      keylen;
5985         __u32   *vallen;
5986         void    *valout;
5987         int      rc;
5988
5989         ENTRY;
5990
5991         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5992         if (key == NULL) {
5993                 CDEBUG(D_IOCTL, "No GETINFO key\n");
5994                 RETURN(err_serious(-EFAULT));
5995         }
5996         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5997                                       RCL_CLIENT);
5998
5999         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
6000         if (vallen == NULL) {
6001                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
6002                                 tgt_name(tsi->tsi_tgt));
6003                 RETURN(err_serious(-EFAULT));
6004         }
6005
6006         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
6007                              *vallen);
6008         rc = req_capsule_server_pack(tsi->tsi_pill);
6009         if (rc)
6010                 RETURN(err_serious(rc));
6011
6012         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
6013         if (valout == NULL) {
6014                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
6015                                 tgt_name(tsi->tsi_tgt));
6016                 RETURN(err_serious(-EFAULT));
6017         }
6018
6019         if (KEY_IS(KEY_FID2PATH)) {
6020                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
6021
6022                 rc = mdt_rpc_fid2path(info, key, keylen, valout, *vallen);
6023                 mdt_thread_info_fini(info);
6024         } else {
6025                 rc = -EINVAL;
6026         }
6027         RETURN(rc);
6028 }
6029
6030 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
6031 {
6032         struct obd_ioctl_data *data = karg;
6033         struct lu_fid *fid;
6034         __u64 version;
6035         struct mdt_object *obj;
6036         struct mdt_lock_handle  *lh;
6037         int rc;
6038         ENTRY;
6039
6040         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
6041             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
6042                 RETURN(-EINVAL);
6043
6044         fid = (struct lu_fid *)data->ioc_inlbuf1;
6045
6046         if (!fid_is_sane(fid))
6047                 RETURN(-EINVAL);
6048
6049         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
6050
6051         lh = &mti->mti_lh[MDT_LH_PARENT];
6052         mdt_lock_reg_init(lh, LCK_CR);
6053
6054         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
6055         if (IS_ERR(obj))
6056                 RETURN(PTR_ERR(obj));
6057
6058         if (mdt_object_remote(obj)) {
6059                 rc = -EREMOTE;
6060                 /**
6061                  * before calling version get the correct MDS should be
6062                  * fid, this is error to find remote object here
6063                  */
6064                 CERROR("nonlocal object "DFID"\n", PFID(fid));
6065         } else if (!mdt_object_exists(obj)) {
6066                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
6067                 rc = -ENOENT;
6068         } else {
6069                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
6070                *(__u64 *)data->ioc_inlbuf2 = version;
6071                 rc = 0;
6072         }
6073         mdt_object_unlock_put(mti, obj, lh, 1);
6074         RETURN(rc);
6075 }
6076
6077 /* ioctls on obd dev */
6078 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
6079                          void *karg, void __user *uarg)
6080 {
6081         struct lu_env      env;
6082         struct obd_device *obd = exp->exp_obd;
6083         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
6084         struct dt_device  *dt = mdt->mdt_bottom;
6085         int rc;
6086
6087         ENTRY;
6088         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
6089         rc = lu_env_init(&env, LCT_MD_THREAD);
6090         if (rc)
6091                 RETURN(rc);
6092
6093         switch (cmd) {
6094         case OBD_IOC_SYNC:
6095                 rc = mdt_device_sync(&env, mdt);
6096                 break;
6097         case OBD_IOC_SET_READONLY:
6098                 rc = dt_sync(&env, dt);
6099                 if (rc == 0)
6100                         rc = dt_ro(&env, dt);
6101                 break;
6102         case OBD_IOC_ABORT_RECOVERY:
6103                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
6104                 obd->obd_abort_recovery = 1;
6105                 target_stop_recovery_thread(obd);
6106                 rc = 0;
6107                 break;
6108         case OBD_IOC_CHANGELOG_REG:
6109         case OBD_IOC_CHANGELOG_DEREG:
6110         case OBD_IOC_CHANGELOG_CLEAR:
6111                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(&env,
6112                                                            mdt->mdt_child,
6113                                                            cmd, len, karg);
6114                 break;
6115         case OBD_IOC_START_LFSCK: {
6116                 struct md_device *next = mdt->mdt_child;
6117                 struct obd_ioctl_data *data = karg;
6118                 struct lfsck_start_param lsp;
6119
6120                 if (unlikely(data == NULL)) {
6121                         rc = -EINVAL;
6122                         break;
6123                 }
6124
6125                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
6126                 lsp.lsp_index_valid = 0;
6127                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
6128                 break;
6129         }
6130         case OBD_IOC_STOP_LFSCK: {
6131                 struct md_device        *next = mdt->mdt_child;
6132                 struct obd_ioctl_data   *data = karg;
6133                 struct lfsck_stop        stop;
6134
6135                 stop.ls_status = LS_STOPPED;
6136                 /* Old lfsck utils may pass NULL @stop. */
6137                 if (data->ioc_inlbuf1 == NULL)
6138                         stop.ls_flags = 0;
6139                 else
6140                         stop.ls_flags =
6141                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
6142
6143                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
6144                 break;
6145         }
6146         case OBD_IOC_QUERY_LFSCK: {
6147                 struct md_device        *next = mdt->mdt_child;
6148                 struct obd_ioctl_data   *data = karg;
6149
6150                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0,
6151                                                  data->ioc_inlbuf1);
6152                 break;
6153         }
6154         case OBD_IOC_GET_OBJ_VERSION: {
6155                 struct mdt_thread_info *mti;
6156                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6157                 memset(mti, 0, sizeof *mti);
6158                 mti->mti_env = &env;
6159                 mti->mti_mdt = mdt;
6160                 mti->mti_exp = exp;
6161
6162                 rc = mdt_ioc_version_get(mti, karg);
6163                 break;
6164         }
6165         case OBD_IOC_CATLOGLIST: {
6166                 struct mdt_thread_info *mti;
6167
6168                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6169                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
6170                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
6171                                        &mti->mti_tmp_fid1);
6172                 break;
6173          }
6174         default:
6175                 rc = -EOPNOTSUPP;
6176                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
6177                         mdt_obd_name(mdt), cmd, rc);
6178         }
6179
6180         lu_env_fini(&env);
6181         RETURN(rc);
6182 }
6183
6184 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
6185 {
6186         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
6187         int rc;
6188         ENTRY;
6189
6190         if (!mdt->mdt_skip_lfsck && !mdt->mdt_bottom->dd_rdonly) {
6191                 struct lfsck_start_param lsp;
6192
6193                 lsp.lsp_start = NULL;
6194                 lsp.lsp_index_valid = 0;
6195                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
6196                                                            OBD_IOC_START_LFSCK,
6197                                                            0, &lsp);
6198                 if (rc != 0 && rc != -EALREADY)
6199                         CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
6200                               mdt_obd_name(mdt), rc);
6201         }
6202
6203         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
6204         RETURN(rc);
6205 }
6206
6207 static int mdt_obd_postrecov(struct obd_device *obd)
6208 {
6209         struct lu_env env;
6210         int rc;
6211
6212         rc = lu_env_init(&env, LCT_MD_THREAD);
6213         if (rc)
6214                 RETURN(rc);
6215         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
6216         lu_env_fini(&env);
6217         return rc;
6218 }
6219
6220 static struct obd_ops mdt_obd_device_ops = {
6221         .o_owner          = THIS_MODULE,
6222         .o_set_info_async = mdt_obd_set_info_async,
6223         .o_connect        = mdt_obd_connect,
6224         .o_reconnect      = mdt_obd_reconnect,
6225         .o_disconnect     = mdt_obd_disconnect,
6226         .o_init_export    = mdt_init_export,
6227         .o_destroy_export = mdt_destroy_export,
6228         .o_iocontrol      = mdt_iocontrol,
6229         .o_postrecov      = mdt_obd_postrecov,
6230 };
6231
6232 static struct lu_device* mdt_device_fini(const struct lu_env *env,
6233                                          struct lu_device *d)
6234 {
6235         struct mdt_device *m = mdt_dev(d);
6236         ENTRY;
6237
6238         mdt_fini(env, m);
6239         RETURN(NULL);
6240 }
6241
6242 static struct lu_device *mdt_device_free(const struct lu_env *env,
6243                                          struct lu_device *d)
6244 {
6245         struct mdt_device *m = mdt_dev(d);
6246         ENTRY;
6247
6248         lu_device_fini(&m->mdt_lu_dev);
6249         OBD_FREE_PTR(m);
6250
6251         RETURN(NULL);
6252 }
6253
6254 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
6255                                           struct lu_device_type *t,
6256                                           struct lustre_cfg *cfg)
6257 {
6258         struct lu_device  *l;
6259         struct mdt_device *m;
6260
6261         OBD_ALLOC_PTR(m);
6262         if (m != NULL) {
6263                 int rc;
6264
6265                 l = &m->mdt_lu_dev;
6266                 rc = mdt_init0(env, m, t, cfg);
6267                 if (rc != 0) {
6268                         mdt_device_free(env, l);
6269                         l = ERR_PTR(rc);
6270                         return l;
6271                 }
6272         } else
6273                 l = ERR_PTR(-ENOMEM);
6274         return l;
6275 }
6276
6277 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
6278 LU_KEY_INIT(mdt, struct mdt_thread_info);
6279
6280 static void mdt_key_fini(const struct lu_context *ctx,
6281                          struct lu_context_key *key, void* data)
6282 {
6283         struct mdt_thread_info *info = data;
6284
6285         if (info->mti_big_lmm) {
6286                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
6287                 info->mti_big_lmm = NULL;
6288                 info->mti_big_lmmsize = 0;
6289         }
6290         OBD_FREE_PTR(info);
6291 }
6292
6293 /* context key: mdt_thread_key */
6294 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
6295
6296 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
6297 {
6298         return lu_ucred(info->mti_env);
6299 }
6300
6301 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
6302 {
6303         return lu_ucred_check(info->mti_env);
6304 }
6305
6306 /**
6307  * Enable/disable COS (Commit On Sharing).
6308  *
6309  * Set/Clear the COS flag in mdt options.
6310  *
6311  * \param mdt mdt device
6312  * \param val 0 disables COS, other values enable COS
6313  */
6314 void mdt_enable_cos(struct mdt_device *mdt, int val)
6315 {
6316         struct lu_env env;
6317         int rc;
6318
6319         mdt->mdt_opts.mo_cos = !!val;
6320         rc = lu_env_init(&env, LCT_LOCAL);
6321         if (unlikely(rc != 0)) {
6322                 CWARN("%s: lu_env initialization failed, cannot "
6323                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
6324                 return;
6325         }
6326         mdt_device_sync(&env, mdt);
6327         lu_env_fini(&env);
6328 }
6329
6330 /**
6331  * Check COS (Commit On Sharing) status.
6332  *
6333  * Return COS flag status.
6334  *
6335  * \param mdt mdt device
6336  */
6337 int mdt_cos_is_enabled(struct mdt_device *mdt)
6338 {
6339         return mdt->mdt_opts.mo_cos != 0;
6340 }
6341
6342 static struct lu_device_type_operations mdt_device_type_ops = {
6343         .ldto_device_alloc = mdt_device_alloc,
6344         .ldto_device_free  = mdt_device_free,
6345         .ldto_device_fini  = mdt_device_fini
6346 };
6347
6348 static struct lu_device_type mdt_device_type = {
6349         .ldt_tags     = LU_DEVICE_MD,
6350         .ldt_name     = LUSTRE_MDT_NAME,
6351         .ldt_ops      = &mdt_device_type_ops,
6352         .ldt_ctx_tags = LCT_MD_THREAD
6353 };
6354
6355 static int __init mdt_init(void)
6356 {
6357         int rc;
6358
6359         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
6360                  FID_NOBRACE_LEN + 1);
6361         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
6362                  FID_LEN + 1);
6363         rc = lu_kmem_init(mdt_caches);
6364         if (rc)
6365                 return rc;
6366
6367         rc = mds_mod_init();
6368         if (rc)
6369                 GOTO(lu_fini, rc);
6370
6371         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
6372                                  LUSTRE_MDT_NAME, &mdt_device_type);
6373         if (rc)
6374                 GOTO(mds_fini, rc);
6375 lu_fini:
6376         if (rc)
6377                 lu_kmem_fini(mdt_caches);
6378 mds_fini:
6379         if (rc)
6380                 mds_mod_exit();
6381         return rc;
6382 }
6383
6384 static void __exit mdt_exit(void)
6385 {
6386         class_unregister_type(LUSTRE_MDT_NAME);
6387         mds_mod_exit();
6388         lu_kmem_fini(mdt_caches);
6389 }
6390
6391 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
6392 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
6393 MODULE_VERSION(LUSTRE_VERSION_STRING);
6394 MODULE_LICENSE("GPL");
6395
6396 module_init(mdt_init);
6397 module_exit(mdt_exit);