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         struct mdt_device       *mdt = info->mti_mdt;
 487         int rc;
 488
 489         ENTRY;
 490
 491         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 492         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 493                                            RCL_SERVER);
 494         if (buf->lb_len == 0)
 495                 RETURN(0);
 496
 497 again:
 498         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 499         if (rc < 0) {
 500                 if (rc == -ENODATA) {
 501                         repbody->mbo_aclsize = 0;
 502                         repbody->mbo_valid |= OBD_MD_FLACL;
 503                         rc = 0;
 504                 } else if (rc == -EOPNOTSUPP) {
 505                         rc = 0;
 506                 } else {
 507                         if (rc == -ERANGE &&
 508                             exp_connect_large_acl(info->mti_exp) &&
 509                             buf->lb_buf != info->mti_big_acl) {
 510                                 if (info->mti_big_acl == NULL) {
 511                                         OBD_ALLOC_LARGE(info->mti_big_acl,
 512                                                         mdt->mdt_max_ea_size);
 513                                         if (info->mti_big_acl == NULL) {
 514                                                 CERROR("%s: unable to grow "
 515                                                        DFID" ACL buffer\n",
 516                                                        mdt_obd_name(mdt),
 517                                                        PFID(mdt_object_fid(o)));
 518                                                 RETURN(-ENOMEM);
 519                                         }
 520
 521                                         info->mti_big_aclsize =
 522                                                         mdt->mdt_max_ea_size;
 523                                 }
 524
 525                                 CDEBUG(D_INODE, "%s: grow the "DFID
 526                                        " ACL buffer to size %d\n",
 527                                        mdt_obd_name(mdt),
 528                                        PFID(mdt_object_fid(o)),
 529                                        mdt->mdt_max_ea_size);
 530
 531                                 buf->lb_buf = info->mti_big_acl;
 532                                 buf->lb_len = info->mti_big_aclsize;
 533
 534                                 goto again;
 535                         }
 536
 537                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 538                                mdt_obd_name(mdt), PFID(mdt_object_fid(o)), rc);
 539                 }
 540         } else {
 541                 if (buf->lb_buf == info->mti_big_acl)
 542                         info->mti_big_acl_used = 1;
 543
 544                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 545                                      rc, NODEMAP_FS_TO_CLIENT);
 546                 /* if all ACLs mapped out, rc is still >= 0 */
 547                 if (rc < 0) {
 548                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 549                                " ACL: rc = %d\n", mdt_obd_name(mdt),
 550                                PFID(mdt_object_fid(o)), rc);
 551                 } else {
 552                         repbody->mbo_aclsize = rc;
 553                         repbody->mbo_valid |= OBD_MD_FLACL;
 554                         rc = 0;
 555                 }
 556         }
 557
 558         RETURN(rc);
 559 }
 560 #endif
 561
 562 /* XXX Look into layout in MDT layer. */
 563 static inline bool mdt_hsm_is_released(struct lov_mds_md *lmm)
 564 {
 565         struct lov_comp_md_v1   *comp_v1;
 566         struct lov_mds_md       *v1;
 567         int                      i;
 568
 569         if (lmm->lmm_magic == LOV_MAGIC_COMP_V1) {
 570                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
 571
 572                 for (i = 0; i < comp_v1->lcm_entry_count; i++) {
 573                         v1 = (struct lov_mds_md *)((char *)comp_v1 +
 574                                 comp_v1->lcm_entries[i].lcme_offset);
 575                         /* We don't support partial release for now */
 576                         if (!(v1->lmm_pattern & LOV_PATTERN_F_RELEASED))
 577                                 return false;
 578                 }
 579                 return true;
 580         } else {
 581                 return (lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) ?
 582                         true : false;
 583         }
 584 }
 585
 586 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 587                         const struct lu_attr *attr, const struct lu_fid *fid)
 588 {
 589         struct md_attr *ma = &info->mti_attr;
 590         struct obd_export *exp = info->mti_exp;
 591         struct lu_nodemap *nodemap = NULL;
 592
 593         LASSERT(ma->ma_valid & MA_INODE);
 594
 595         if (attr->la_valid & LA_ATIME) {
 596                 b->mbo_atime = attr->la_atime;
 597                 b->mbo_valid |= OBD_MD_FLATIME;
 598         }
 599         if (attr->la_valid & LA_MTIME) {
 600                 b->mbo_mtime = attr->la_mtime;
 601                 b->mbo_valid |= OBD_MD_FLMTIME;
 602         }
 603         if (attr->la_valid & LA_CTIME) {
 604                 b->mbo_ctime = attr->la_ctime;
 605                 b->mbo_valid |= OBD_MD_FLCTIME;
 606         }
 607         if (attr->la_valid & LA_FLAGS) {
 608                 b->mbo_flags = attr->la_flags;
 609                 b->mbo_valid |= OBD_MD_FLFLAGS;
 610         }
 611         if (attr->la_valid & LA_NLINK) {
 612                 b->mbo_nlink = attr->la_nlink;
 613                 b->mbo_valid |= OBD_MD_FLNLINK;
 614         }
 615         if (attr->la_valid & (LA_UID|LA_GID)) {
 616                 nodemap = nodemap_get_from_exp(exp);
 617                 if (IS_ERR(nodemap))
 618                         goto out;
 619         }
 620         if (attr->la_valid & LA_UID) {
 621                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 622                                             NODEMAP_FS_TO_CLIENT,
 623                                             attr->la_uid);
 624                 b->mbo_valid |= OBD_MD_FLUID;
 625         }
 626         if (attr->la_valid & LA_GID) {
 627                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 628                                             NODEMAP_FS_TO_CLIENT,
 629                                             attr->la_gid);
 630                 b->mbo_valid |= OBD_MD_FLGID;
 631         }
 632
 633         if (attr->la_valid & LA_PROJID) {
 634                 /* TODO, nodemap for project id */
 635                 b->mbo_projid = attr->la_projid;
 636                 b->mbo_valid |= OBD_MD_FLPROJID;
 637         }
 638
 639         b->mbo_mode = attr->la_mode;
 640         if (attr->la_valid & LA_MODE)
 641                 b->mbo_valid |= OBD_MD_FLMODE;
 642         if (attr->la_valid & LA_TYPE)
 643                 b->mbo_valid |= OBD_MD_FLTYPE;
 644
 645         if (fid != NULL) {
 646                 b->mbo_fid1 = *fid;
 647                 b->mbo_valid |= OBD_MD_FLID;
 648                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid=%#llx\n",
 649                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 650         }
 651
 652         if (!(attr->la_valid & LA_TYPE))
 653                 return;
 654
 655         b->mbo_rdev   = attr->la_rdev;
 656         b->mbo_size   = attr->la_size;
 657         b->mbo_blocks = attr->la_blocks;
 658
 659         if (!S_ISREG(attr->la_mode)) {
 660                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 661         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 662                 /* means no objects are allocated on osts. */
 663                 LASSERT(!(ma->ma_valid & MA_LOV));
 664                 /* just ignore blocks occupied by extend attributes on MDS */
 665                 b->mbo_blocks = 0;
 666                 /* if no object is allocated on osts, the size on mds is valid.
 667                  * b=22272 */
 668                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 669         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 670                    mdt_hsm_is_released(ma->ma_lmm)) {
 671                 /* A released file stores its size on MDS. */
 672                 /* But return 1 block for released file, unless tools like tar
 673                  * will consider it fully sparse. (LU-3864)
 674                  */
 675                 if (unlikely(b->mbo_size == 0))
 676                         b->mbo_blocks = 0;
 677                 else
 678                         b->mbo_blocks = 1;
 679                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 680         }
 681
 682         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 683                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 684                        PFID(fid), (unsigned long long)b->mbo_size);
 685
 686 out:
 687         if (!IS_ERR_OR_NULL(nodemap))
 688                 nodemap_putref(nodemap);
 689 }
 690
 691 static inline int mdt_body_has_lov(const struct lu_attr *la,
 692                                    const struct mdt_body *body)
 693 {
 694         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 695                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 696 }
 697
 698 void mdt_client_compatibility(struct mdt_thread_info *info)
 699 {
 700         struct mdt_body       *body;
 701         struct ptlrpc_request *req = mdt_info_req(info);
 702         struct obd_export     *exp = req->rq_export;
 703         struct md_attr        *ma = &info->mti_attr;
 704         struct lu_attr        *la = &ma->ma_attr;
 705         ENTRY;
 706
 707         if (exp_connect_layout(exp))
 708                 /* the client can deal with 16-bit lmm_stripe_count */
 709                 RETURN_EXIT;
 710
 711         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 712
 713         if (!mdt_body_has_lov(la, body))
 714                 RETURN_EXIT;
 715
 716         /* now we have a reply with a lov for a client not compatible with the
 717          * layout lock so we have to clean the layout generation number */
 718         if (S_ISREG(la->la_mode))
 719                 ma->ma_lmm->lmm_layout_gen = 0;
 720         EXIT;
 721 }
 722
 723 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 724                                    struct mdt_object *o)
 725 {
 726         const struct lu_env *env = info->mti_env;
 727         int rc, rc2;
 728
 729         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 730                           XATTR_NAME_LOV);
 731
 732         if (rc == -ENODATA)
 733                 rc = 0;
 734
 735         if (rc < 0)
 736                 goto out;
 737
 738         /* Is it a directory? Let's check for the LMV as well */
 739         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 740                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 741                                    XATTR_NAME_LMV);
 742
 743                 if (rc2 == -ENODATA)
 744                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 745                                            &LU_BUF_NULL,
 746                                            XATTR_NAME_DEFAULT_LMV);
 747
 748                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 749                         rc = rc2;
 750         }
 751
 752 out:
 753         return rc;
 754 }
 755
 756 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 757                       const char *name)
 758 {
 759         const struct lu_env *env = info->mti_env;
 760         int rc;
 761         ENTRY;
 762
 763         LASSERT(info->mti_big_lmm_used == 0);
 764         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 765         if (rc < 0)
 766                 RETURN(rc);
 767
 768         /* big_lmm may need to be grown */
 769         if (info->mti_big_lmmsize < rc) {
 770                 int size = size_roundup_power2(rc);
 771
 772                 if (info->mti_big_lmmsize > 0) {
 773                         /* free old buffer */
 774                         LASSERT(info->mti_big_lmm);
 775                         OBD_FREE_LARGE(info->mti_big_lmm,
 776                                        info->mti_big_lmmsize);
 777                         info->mti_big_lmm = NULL;
 778                         info->mti_big_lmmsize = 0;
 779                 }
 780
 781                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 782                 if (info->mti_big_lmm == NULL)
 783                         RETURN(-ENOMEM);
 784                 info->mti_big_lmmsize = size;
 785         }
 786         LASSERT(info->mti_big_lmmsize >= rc);
 787
 788         info->mti_buf.lb_buf = info->mti_big_lmm;
 789         info->mti_buf.lb_len = info->mti_big_lmmsize;
 790         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 791
 792         RETURN(rc);
 793 }
 794
 795 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 796                    struct md_attr *ma, const char *name)
 797 {
 798         struct md_object *next = mdt_object_child(o);
 799         struct lu_buf    *buf = &info->mti_buf;
 800         int rc;
 801
 802         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 803                 buf->lb_buf = ma->ma_lmm;
 804                 buf->lb_len = ma->ma_lmm_size;
 805                 LASSERT(!(ma->ma_valid & MA_LOV));
 806         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 807                 buf->lb_buf = ma->ma_lmv;
 808                 buf->lb_len = ma->ma_lmv_size;
 809                 LASSERT(!(ma->ma_valid & MA_LMV));
 810         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 811                 buf->lb_buf = ma->ma_lmv;
 812                 buf->lb_len = ma->ma_lmv_size;
 813                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 814         } else {
 815                 return -EINVAL;
 816         }
 817
 818         rc = mo_xattr_get(info->mti_env, next, buf, name);
 819         if (rc > 0) {
 820
 821 got:
 822                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 823                         if (info->mti_big_lmm_used)
 824                                 ma->ma_lmm = info->mti_big_lmm;
 825
 826                         /* NOT return LOV EA with hole to old client. */
 827                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 828                                      LOV_PATTERN_F_HOLE) &&
 829                             !(exp_connect_flags(info->mti_exp) &
 830                               OBD_CONNECT_LFSCK)) {
 831                                 return -EIO;
 832                         } else {
 833                                 ma->ma_lmm_size = rc;
 834                                 ma->ma_valid |= MA_LOV;
 835                         }
 836                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 837                         if (info->mti_big_lmm_used)
 838                                 ma->ma_lmv = info->mti_big_lmm;
 839
 840                         ma->ma_lmv_size = rc;
 841                         ma->ma_valid |= MA_LMV;
 842                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 843                         ma->ma_lmv_size = rc;
 844                         ma->ma_valid |= MA_LMV_DEF;
 845                 }
 846
 847                 /* Update mdt_max_mdsize so all clients will be aware that */
 848                 if (info->mti_mdt->mdt_max_mdsize < rc)
 849                         info->mti_mdt->mdt_max_mdsize = rc;
 850
 851                 rc = 0;
 852         } else if (rc == -ENODATA) {
 853                 /* no LOV EA */
 854                 rc = 0;
 855         } else if (rc == -ERANGE) {
 856                 /* Default LMV has fixed size, so it must be able to fit
 857                  * in the original buffer */
 858                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 859                         return rc;
 860                 rc = mdt_big_xattr_get(info, o, name);
 861                 if (rc > 0) {
 862                         info->mti_big_lmm_used = 1;
 863                         goto got;
 864                 }
 865         }
 866
 867         return rc;
 868 }
 869
 870 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 871                              struct mdt_object *o, struct lu_fid *pfid)
 872 {
 873         struct lu_buf           *buf = &info->mti_buf;
 874         struct link_ea_header   *leh;
 875         struct link_ea_entry    *lee;
 876         int                      rc;
 877         ENTRY;
 878
 879         buf->lb_buf = info->mti_big_lmm;
 880         buf->lb_len = info->mti_big_lmmsize;
 881         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 882                           buf, XATTR_NAME_LINK);
 883         /* ignore errors, MA_PFID won't be set and it is
 884          * up to the caller to treat this as an error */
 885         if (rc == -ERANGE || buf->lb_len == 0) {
 886                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 887                 buf->lb_buf = info->mti_big_lmm;
 888                 buf->lb_len = info->mti_big_lmmsize;
 889         }
 890
 891         if (rc < 0)
 892                 RETURN(rc);
 893         if (rc < sizeof(*leh)) {
 894                 CERROR("short LinkEA on "DFID": rc = %d\n",
 895                        PFID(mdt_object_fid(o)), rc);
 896                 RETURN(-ENODATA);
 897         }
 898
 899         leh = (struct link_ea_header *) buf->lb_buf;
 900         lee = (struct link_ea_entry *)(leh + 1);
 901         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 902                 leh->leh_magic = LINK_EA_MAGIC;
 903                 leh->leh_reccount = __swab32(leh->leh_reccount);
 904                 leh->leh_len = __swab64(leh->leh_len);
 905         }
 906         if (leh->leh_magic != LINK_EA_MAGIC)
 907                 RETURN(-EINVAL);
 908         if (leh->leh_reccount == 0)
 909                 RETURN(-ENODATA);
 910
 911         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 912         fid_be_to_cpu(pfid, pfid);
 913
 914         RETURN(0);
 915 }
 916
 917 int mdt_attr_get_complex(struct mdt_thread_info *info,
 918                          struct mdt_object *o, struct md_attr *ma)
 919 {
 920         const struct lu_env *env = info->mti_env;
 921         struct md_object    *next = mdt_object_child(o);
 922         struct lu_buf       *buf = &info->mti_buf;
 923         int                  need = ma->ma_need;
 924         int                  rc = 0, rc2;
 925         u32                  mode;
 926         ENTRY;
 927
 928         ma->ma_valid = 0;
 929
 930         if (mdt_object_exists(o) == 0)
 931                 GOTO(out, rc = -ENOENT);
 932         mode = lu_object_attr(&next->mo_lu);
 933
 934         if (need & MA_INODE) {
 935                 ma->ma_need = MA_INODE;
 936                 rc = mo_attr_get(env, next, ma);
 937                 if (rc)
 938                         GOTO(out, rc);
 939                 ma->ma_valid |= MA_INODE;
 940         }
 941
 942         if (need & MA_PFID) {
 943                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 944                 if (rc == 0)
 945                         ma->ma_valid |= MA_PFID;
 946                 /* ignore this error, parent fid is not mandatory */
 947                 rc = 0;
 948         }
 949
 950         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 951                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 952                 if (rc)
 953                         GOTO(out, rc);
 954         }
 955
 956         if (need & MA_LMV && S_ISDIR(mode)) {
 957                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 958                 if (rc != 0)
 959                         GOTO(out, rc);
 960         }
 961
 962         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 963                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 964                 if (rc != 0)
 965                         GOTO(out, rc);
 966         }
 967
 968         if (need & MA_HSM && S_ISREG(mode)) {
 969                 buf->lb_buf = info->mti_xattr_buf;
 970                 buf->lb_len = sizeof(info->mti_xattr_buf);
 971                 CLASSERT(sizeof(struct hsm_attrs) <=
 972                          sizeof(info->mti_xattr_buf));
 973                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 974                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 975                 if (rc2 == 0)
 976                         ma->ma_valid |= MA_HSM;
 977                 else if (rc2 < 0 && rc2 != -ENODATA)
 978                         GOTO(out, rc = rc2);
 979         }
 980
 981 #ifdef CONFIG_FS_POSIX_ACL
 982         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 983                 buf->lb_buf = ma->ma_acl;
 984                 buf->lb_len = ma->ma_acl_size;
 985                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 986                 if (rc2 > 0) {
 987                         ma->ma_acl_size = rc2;
 988                         ma->ma_valid |= MA_ACL_DEF;
 989                 } else if (rc2 == -ENODATA) {
 990                         /* no ACLs */
 991                         ma->ma_acl_size = 0;
 992                 } else
 993                         GOTO(out, rc = rc2);
 994         }
 995 #endif
 996 out:
 997         ma->ma_need = need;
 998         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = %#llx ma_lmm=%p\n",
 999                rc, ma->ma_valid, ma->ma_lmm);
1000         RETURN(rc);
1001 }
1002
1003 static int mdt_getattr_internal(struct mdt_thread_info *info,
1004                                 struct mdt_object *o, int ma_need)
1005 {
1006         struct md_object        *next = mdt_object_child(o);
1007         const struct mdt_body   *reqbody = info->mti_body;
1008         struct ptlrpc_request   *req = mdt_info_req(info);
1009         struct md_attr          *ma = &info->mti_attr;
1010         struct lu_attr          *la = &ma->ma_attr;
1011         struct req_capsule      *pill = info->mti_pill;
1012         const struct lu_env     *env = info->mti_env;
1013         struct mdt_body         *repbody;
1014         struct lu_buf           *buffer = &info->mti_buf;
1015         struct obd_export       *exp = info->mti_exp;
1016         int                      rc;
1017         ENTRY;
1018
1019         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
1020                 RETURN(err_serious(-ENOMEM));
1021
1022         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1023
1024         ma->ma_valid = 0;
1025
1026         if (mdt_object_remote(o)) {
1027                 /* This object is located on remote node.*/
1028                 /* Return -ENOTSUPP for old client */
1029                 if (!mdt_is_dne_client(req->rq_export))
1030                         GOTO(out, rc = -ENOTSUPP);
1031
1032                 repbody->mbo_fid1 = *mdt_object_fid(o);
1033                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
1034                 GOTO(out, rc = 0);
1035         }
1036
1037         if (reqbody->mbo_eadatasize > 0) {
1038                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
1039                 if (buffer->lb_buf == NULL)
1040                         GOTO(out, rc = -EPROTO);
1041                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
1042                                                       RCL_SERVER);
1043         } else {
1044                 buffer->lb_buf = NULL;
1045                 buffer->lb_len = 0;
1046                 ma_need &= ~(MA_LOV | MA_LMV);
1047                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
1048                        mdt_obd_name(info->mti_mdt),
1049                        req->rq_export->exp_client_uuid.uuid);
1050         }
1051
1052         /* If it is dir object and client require MEA, then we got MEA */
1053         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1054             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
1055                 /* Assumption: MDT_MD size is enough for lmv size. */
1056                 ma->ma_lmv = buffer->lb_buf;
1057                 ma->ma_lmv_size = buffer->lb_len;
1058                 ma->ma_need = MA_INODE;
1059                 if (ma->ma_lmv_size > 0) {
1060                         if (reqbody->mbo_valid & OBD_MD_MEA)
1061                                 ma->ma_need |= MA_LMV;
1062                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
1063                                 ma->ma_need |= MA_LMV_DEF;
1064                 }
1065         } else {
1066                 ma->ma_lmm = buffer->lb_buf;
1067                 ma->ma_lmm_size = buffer->lb_len;
1068                 ma->ma_need = MA_INODE | MA_HSM;
1069                 if (ma->ma_lmm_size > 0)
1070                         ma->ma_need |= MA_LOV;
1071         }
1072
1073         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1074             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
1075             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
1076                 /* get default stripe info for this dir. */
1077                 ma->ma_need |= MA_LOV_DEF;
1078         }
1079         ma->ma_need |= ma_need;
1080
1081         rc = mdt_attr_get_complex(info, o, ma);
1082         if (unlikely(rc)) {
1083                 CDEBUG(rc == -ENOENT ? D_OTHER : D_ERROR,
1084                        "%s: getattr error for "DFID": rc = %d\n",
1085                        mdt_obd_name(info->mti_mdt),
1086                        PFID(mdt_object_fid(o)), rc);
1087                 RETURN(rc);
1088         }
1089
1090         /* if file is released, check if a restore is running */
1091         if (ma->ma_valid & MA_HSM) {
1092                 repbody->mbo_valid |= OBD_MD_TSTATE;
1093                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
1094                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
1095                         repbody->mbo_t_state = MS_RESTORE;
1096         }
1097
1098         if (likely(ma->ma_valid & MA_INODE))
1099                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
1100         else
1101                 RETURN(-EFAULT);
1102
1103         if (mdt_body_has_lov(la, reqbody)) {
1104                 if (ma->ma_valid & MA_LOV) {
1105                         LASSERT(ma->ma_lmm_size);
1106                         repbody->mbo_eadatasize = ma->ma_lmm_size;
1107                         if (S_ISDIR(la->la_mode))
1108                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
1109                         else
1110                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
1111                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
1112                 }
1113                 if (ma->ma_valid & MA_LMV) {
1114                         /* Return -ENOTSUPP for old client */
1115                         if (!mdt_is_striped_client(req->rq_export))
1116                                 RETURN(-ENOTSUPP);
1117
1118                         LASSERT(S_ISDIR(la->la_mode));
1119                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1120                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1121                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
1122                 }
1123                 if (ma->ma_valid & MA_LMV_DEF) {
1124                         /* Return -ENOTSUPP for old client */
1125                         if (!mdt_is_striped_client(req->rq_export))
1126                                 RETURN(-ENOTSUPP);
1127                         LASSERT(S_ISDIR(la->la_mode));
1128                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1129                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1130                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
1131                                                OBD_MD_DEFAULT_MEA);
1132                 }
1133         } else if (S_ISLNK(la->la_mode) &&
1134                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
1135                 buffer->lb_buf = ma->ma_lmm;
1136                 /* eadatasize from client includes NULL-terminator, so
1137                  * there is no need to read it */
1138                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
1139                 rc = mo_readlink(env, next, buffer);
1140                 if (unlikely(rc <= 0)) {
1141                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
1142                                mdt_obd_name(info->mti_mdt),
1143                                PFID(mdt_object_fid(o)), rc);
1144                         rc = -EFAULT;
1145                 } else {
1146                         int print_limit = min_t(int, PAGE_SIZE - 128, rc);
1147
1148                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
1149                                 rc -= 2;
1150                         repbody->mbo_valid |= OBD_MD_LINKNAME;
1151                         /* we need to report back size with NULL-terminator
1152                          * because client expects that */
1153                         repbody->mbo_eadatasize = rc + 1;
1154                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1155                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1156                                        "on "DFID ", expected %d\n",
1157                                        mdt_obd_name(info->mti_mdt),
1158                                        rc, PFID(mdt_object_fid(o)),
1159                                        reqbody->mbo_eadatasize - 1);
1160                         /* NULL terminate */
1161                         ((char *)ma->ma_lmm)[rc] = 0;
1162
1163                         /* If the total CDEBUG() size is larger than a page, it
1164                          * will print a warning to the console, avoid this by
1165                          * printing just the last part of the symlink. */
1166                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1167                                print_limit < rc ? "..." : "", print_limit,
1168                                (char *)ma->ma_lmm + rc - print_limit, rc);
1169                         rc = 0;
1170                 }
1171         }
1172
1173         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1174                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1175                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1176                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1177                        repbody->mbo_max_mdsize);
1178         }
1179
1180 #ifdef CONFIG_FS_POSIX_ACL
1181         if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1182                  (reqbody->mbo_valid & OBD_MD_FLACL)) {
1183                 struct lu_nodemap *nodemap = nodemap_get_from_exp(exp);
1184                 if (IS_ERR(nodemap))
1185                         RETURN(PTR_ERR(nodemap));
1186
1187                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1188                 nodemap_putref(nodemap);
1189         }
1190 #endif
1191
1192 out:
1193         if (rc == 0)
1194                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1195
1196         RETURN(rc);
1197 }
1198
1199 static int mdt_getattr(struct tgt_session_info *tsi)
1200 {
1201         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1202         struct mdt_object       *obj = info->mti_object;
1203         struct req_capsule      *pill = info->mti_pill;
1204         struct mdt_body         *reqbody;
1205         struct mdt_body         *repbody;
1206         int rc, rc2;
1207         ENTRY;
1208
1209         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1210         LASSERT(reqbody);
1211         LASSERT(obj != NULL);
1212         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1213
1214         /* Unlike intent case where we need to pre-fill out buffers early on
1215          * in intent policy for ldlm reasons, here we can have a much better
1216          * guess at EA size by just reading it from disk.
1217          * Exceptions are readdir and (missing) directory striping */
1218         /* Readlink */
1219         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1220                 /* No easy way to know how long is the symlink, but it cannot
1221                  * be more than PATH_MAX, so we allocate +1 */
1222                 rc = PATH_MAX + 1;
1223
1224         /* A special case for fs ROOT: getattr there might fetch
1225          * default EA for entire fs, not just for this dir!
1226          */
1227         } else if (lu_fid_eq(mdt_object_fid(obj),
1228                              &info->mti_mdt->mdt_md_root_fid) &&
1229                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1230                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1231                                                                  MDS_GETATTR)) {
1232                 /* Should the default strping be bigger, mdt_fix_reply
1233                  * will reallocate */
1234                 rc = DEF_REP_MD_SIZE;
1235         } else {
1236                 /* Read the actual EA size from disk */
1237                 rc = mdt_attr_get_eabuf_size(info, obj);
1238         }
1239
1240         if (rc < 0)
1241                 GOTO(out, rc = err_serious(rc));
1242
1243         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1244
1245         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
1246          * by default. If the target object has more ACL entries, then
1247          * enlarge the buffer when necessary. */
1248         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
1249                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
1250
1251         rc = req_capsule_server_pack(pill);
1252         if (unlikely(rc != 0))
1253                 GOTO(out, rc = err_serious(rc));
1254
1255         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1256         LASSERT(repbody != NULL);
1257         repbody->mbo_eadatasize = 0;
1258         repbody->mbo_aclsize = 0;
1259
1260         rc = mdt_check_ucred(info);
1261         if (unlikely(rc))
1262                 GOTO(out_shrink, rc);
1263
1264         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1265
1266         rc = mdt_getattr_internal(info, obj, 0);
1267         EXIT;
1268 out_shrink:
1269         mdt_client_compatibility(info);
1270         rc2 = mdt_fix_reply(info);
1271         if (rc == 0)
1272                 rc = rc2;
1273 out:
1274         mdt_thread_info_fini(info);
1275         return rc;
1276 }
1277
1278 /**
1279  * Handler of layout intent RPC requiring the layout modification
1280  *
1281  * \param[in] info      thread environment
1282  * \param[in] obj       object
1283  * \param[in] layout    layout intent
1284  * \param[in] buf       buffer containing client's lovea, could be empty
1285  *
1286  * \retval 0    on success
1287  * \retval < 0  error code
1288  */
1289 static int mdt_layout_change(struct mdt_thread_info *info,
1290                              struct mdt_object *obj,
1291                              struct layout_intent *layout,
1292                              const struct lu_buf *buf)
1293 {
1294         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LOCAL];
1295         int rc;
1296         ENTRY;
1297
1298         CDEBUG(D_INFO, "got layout change request from client: "
1299                "opc:%u flags:%#x extent[%#llx,%#llx)\n",
1300                layout->li_opc, layout->li_flags,
1301                layout->li_start, layout->li_end);
1302         if (layout->li_start >= layout->li_end) {
1303                 CERROR("Recieved an invalid layout change range [%llu, %llu) "
1304                        "for "DFID"\n", layout->li_start, layout->li_end,
1305                        PFID(mdt_object_fid(obj)));
1306                 RETURN(-EINVAL);
1307         }
1308
1309         if (!S_ISREG(lu_object_attr(&obj->mot_obj)))
1310                 GOTO(out, rc = -EINVAL);
1311
1312         rc = mo_permission(info->mti_env, NULL, mdt_object_child(obj), NULL,
1313                            MAY_WRITE);
1314         if (rc)
1315                 GOTO(out, rc);
1316
1317         /* take layout lock to prepare layout change */
1318         mdt_lock_reg_init(lh, LCK_EX);
1319         rc = mdt_object_lock(info, obj, lh,
1320                              MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR);
1321         if (rc)
1322                 GOTO(out, rc);
1323
1324         rc = mo_layout_change(info->mti_env, mdt_object_child(obj), layout,
1325                               buf);
1326
1327         mdt_object_unlock(info, obj, lh, 1);
1328 out:
1329         RETURN(rc);
1330 }
1331
1332 /**
1333  * Exchange MOF_LOV_CREATED flags between two objects after a
1334  * layout swap. No assumption is made on whether o1 or o2 have
1335  * created objects or not.
1336  *
1337  * \param[in,out] o1    First swap layout object
1338  * \param[in,out] o2    Second swap layout object
1339  */
1340 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1341 {
1342         unsigned int o1_lov_created = o1->mot_lov_created;
1343
1344         mutex_lock(&o1->mot_lov_mutex);
1345         mutex_lock(&o2->mot_lov_mutex);
1346
1347         o1->mot_lov_created = o2->mot_lov_created;
1348         o2->mot_lov_created = o1_lov_created;
1349
1350         mutex_unlock(&o2->mot_lov_mutex);
1351         mutex_unlock(&o1->mot_lov_mutex);
1352 }
1353
1354 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1355 {
1356         struct mdt_thread_info  *info;
1357         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1358         struct obd_export       *exp = req->rq_export;
1359         struct mdt_object       *o1, *o2, *o;
1360         struct mdt_lock_handle  *lh1, *lh2;
1361         struct mdc_swap_layouts *msl;
1362         int                      rc;
1363         ENTRY;
1364
1365         /* client does not support layout lock, so layout swaping
1366          * is disabled.
1367          * FIXME: there is a problem for old clients which don't support
1368          * layout lock yet. If those clients have already opened the file
1369          * they won't be notified at all so that old layout may still be
1370          * used to do IO. This can be fixed after file release is landed by
1371          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1372         if (!exp_connect_layout(exp))
1373                 RETURN(-EOPNOTSUPP);
1374
1375         info = tsi2mdt_info(tsi);
1376
1377         if (info->mti_dlm_req != NULL)
1378                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1379
1380         o1 = info->mti_object;
1381         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1382                                 &info->mti_body->mbo_fid2);
1383         if (IS_ERR(o))
1384                 GOTO(out, rc = PTR_ERR(o));
1385
1386         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1387                 GOTO(put, rc = -ENOENT);
1388
1389         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1390         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1391                 GOTO(put, rc);
1392
1393         if (rc < 0)
1394                 swap(o1, o2);
1395
1396         /* permission check. Make sure the calling process having permission
1397          * to write both files. */
1398         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1399                                 MAY_WRITE);
1400         if (rc < 0)
1401                 GOTO(put, rc);
1402
1403         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1404                                 MAY_WRITE);
1405         if (rc < 0)
1406                 GOTO(put, rc);
1407
1408         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1409         if (msl == NULL)
1410                 GOTO(put, rc = -EPROTO);
1411
1412         lh1 = &info->mti_lh[MDT_LH_NEW];
1413         mdt_lock_reg_init(lh1, LCK_EX);
1414         lh2 = &info->mti_lh[MDT_LH_OLD];
1415         mdt_lock_reg_init(lh2, LCK_EX);
1416
1417         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1418                              MDS_INODELOCK_XATTR);
1419         if (rc < 0)
1420                 GOTO(put, rc);
1421
1422         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1423                              MDS_INODELOCK_XATTR);
1424         if (rc < 0)
1425                 GOTO(unlock1, rc);
1426
1427         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1428                              mdt_object_child(o2), msl->msl_flags);
1429         if (rc < 0)
1430                 GOTO(unlock2, rc);
1431
1432         mdt_swap_lov_flag(o1, o2);
1433
1434 unlock2:
1435         mdt_object_unlock(info, o2, lh2, rc);
1436 unlock1:
1437         mdt_object_unlock(info, o1, lh1, rc);
1438 put:
1439         mdt_object_put(info->mti_env, o);
1440 out:
1441         mdt_thread_info_fini(info);
1442         RETURN(rc);
1443 }
1444
1445 static int mdt_raw_lookup(struct mdt_thread_info *info,
1446                           struct mdt_object *parent,
1447                           const struct lu_name *lname,
1448                           struct ldlm_reply *ldlm_rep)
1449 {
1450         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1451         int              rc;
1452         ENTRY;
1453
1454         LASSERT(!info->mti_cross_ref);
1455
1456         /* Only got the fid of this obj by name */
1457         fid_zero(child_fid);
1458         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1459                         lname, child_fid, &info->mti_spec);
1460         if (rc == 0) {
1461                 struct mdt_body *repbody;
1462
1463                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1464                 repbody->mbo_fid1 = *child_fid;
1465                 repbody->mbo_valid = OBD_MD_FLID;
1466                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1467         } else if (rc == -ENOENT) {
1468                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1469         }
1470
1471         RETURN(rc);
1472 }
1473
1474 /*
1475  * UPDATE lock should be taken against parent, and be released before exit;
1476  * child_bits lock should be taken against child, and be returned back:
1477  *            (1)normal request should release the child lock;
1478  *            (2)intent request will grant the lock to client.
1479  */
1480 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1481                                  struct mdt_lock_handle *lhc,
1482                                  __u64 child_bits,
1483                                  struct ldlm_reply *ldlm_rep)
1484 {
1485         struct ptlrpc_request  *req       = mdt_info_req(info);
1486         struct mdt_body        *reqbody   = NULL;
1487         struct mdt_object      *parent    = info->mti_object;
1488         struct mdt_object      *child;
1489         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1490         struct lu_name         *lname     = NULL;
1491         struct mdt_lock_handle *lhp       = NULL;
1492         struct ldlm_lock       *lock;
1493         bool                    is_resent;
1494         bool                    try_layout;
1495         int                     ma_need = 0;
1496         int                     rc;
1497         ENTRY;
1498
1499         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1500         LASSERT(ergo(is_resent,
1501                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1502
1503         if (parent == NULL)
1504                 RETURN(-ENOENT);
1505
1506         if (info->mti_cross_ref) {
1507                 /* Only getattr on the child. Parent is on another node. */
1508                 mdt_set_disposition(info, ldlm_rep,
1509                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1510                 child = parent;
1511                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1512                        "ldlm_rep = %p\n",
1513                        PFID(mdt_object_fid(child)), ldlm_rep);
1514
1515                 rc = mdt_check_resent_lock(info, child, lhc);
1516                 if (rc < 0) {
1517                         RETURN(rc);
1518                 } else if (rc > 0) {
1519                         mdt_lock_handle_init(lhc);
1520                         mdt_lock_reg_init(lhc, LCK_PR);
1521
1522                         /*
1523                          * Object's name is on another MDS, no lookup or layout
1524                          * lock is needed here but update lock is.
1525                          */
1526                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1527                                         MDS_INODELOCK_LAYOUT);
1528                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1529
1530                         rc = mdt_object_lock(info, child, lhc, child_bits);
1531                         if (rc < 0)
1532                                 RETURN(rc);
1533                 }
1534
1535                 /* Finally, we can get attr for child. */
1536                 if (!mdt_object_exists(child)) {
1537                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1538                                         &child->mot_obj,
1539                                         "remote object doesn't exist.");
1540                         mdt_object_unlock(info, child, lhc, 1);
1541                         RETURN(-ENOENT);
1542                 }
1543
1544                 rc = mdt_getattr_internal(info, child, 0);
1545                 if (unlikely(rc != 0))
1546                         mdt_object_unlock(info, child, lhc, 1);
1547
1548                 RETURN(rc);
1549         }
1550
1551         lname = &info->mti_name;
1552         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1553
1554         if (lu_name_is_valid(lname)) {
1555                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1556                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1557                        PNAME(lname), ldlm_rep);
1558         } else {
1559                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1560                 if (unlikely(reqbody == NULL))
1561                         RETURN(err_serious(-EPROTO));
1562
1563                 *child_fid = reqbody->mbo_fid2;
1564
1565                 if (unlikely(!fid_is_sane(child_fid)))
1566                         RETURN(err_serious(-EINVAL));
1567
1568                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1569                        "ldlm_rep = %p\n",
1570                        PFID(mdt_object_fid(parent)),
1571                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1572         }
1573
1574         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1575
1576         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1577                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1578                                 &parent->mot_obj,
1579                                 "Parent doesn't exist!");
1580                 RETURN(-ESTALE);
1581         }
1582
1583         if (mdt_object_remote(parent)) {
1584                 CERROR("%s: parent "DFID" is on remote target\n",
1585                        mdt_obd_name(info->mti_mdt),
1586                        PFID(mdt_object_fid(parent)));
1587                 RETURN(-EIO);
1588         }
1589
1590         if (lu_name_is_valid(lname)) {
1591                 /* Always allow to lookup ".." */
1592                 if (unlikely(lname->ln_namelen == 2 &&
1593                              lname->ln_name[0] == '.' &&
1594                              lname->ln_name[1] == '.'))
1595                         info->mti_spec.sp_permitted = 1;
1596
1597                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1598                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1599
1600                         RETURN(rc);
1601                 }
1602
1603                 /* step 1: lock parent only if parent is a directory */
1604                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1605                         lhp = &info->mti_lh[MDT_LH_PARENT];
1606                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1607                         rc = mdt_object_lock(info, parent, lhp,
1608                                              MDS_INODELOCK_UPDATE);
1609                         if (unlikely(rc != 0))
1610                                 RETURN(rc);
1611                 }
1612
1613                 /* step 2: lookup child's fid by name */
1614                 fid_zero(child_fid);
1615                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1616                                 child_fid, &info->mti_spec);
1617                 if (rc == -ENOENT)
1618                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1619
1620                 if (rc != 0)
1621                         GOTO(out_parent, rc);
1622         }
1623
1624         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1625
1626         /*
1627          *step 3: find the child object by fid & lock it.
1628          *        regardless if it is local or remote.
1629          *
1630          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1631          *      set parent dir fid the same as child fid in getattr by fid case
1632          *      we should not lu_object_find() the object again, could lead
1633          *      to hung if there is a concurrent unlink destroyed the object.
1634          */
1635         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1636                 mdt_object_get(info->mti_env, parent);
1637                 child = parent;
1638         } else {
1639                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1640                                         child_fid);
1641         }
1642
1643         if (unlikely(IS_ERR(child)))
1644                 GOTO(out_parent, rc = PTR_ERR(child));
1645
1646         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1647         if (!mdt_object_exists(child)) {
1648                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1649                                 &child->mot_obj,
1650                                 "Object doesn't exist!");
1651                 GOTO(out_child, rc = -ENOENT);
1652         }
1653
1654         rc = mdt_check_resent_lock(info, child, lhc);
1655         if (rc < 0) {
1656                 GOTO(out_child, rc);
1657         } else if (rc > 0) {
1658                 mdt_lock_handle_init(lhc);
1659                 mdt_lock_reg_init(lhc, LCK_PR);
1660                 try_layout = false;
1661
1662                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1663                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1664                         struct md_attr *ma = &info->mti_attr;
1665
1666                         ma->ma_valid = 0;
1667                         ma->ma_need = MA_INODE;
1668                         rc = mdt_attr_get_complex(info, child, ma);
1669                         if (unlikely(rc != 0))
1670                                 GOTO(out_child, rc);
1671
1672                         /* If the file has not been changed for some time, we
1673                          * return not only a LOOKUP lock, but also an UPDATE
1674                          * lock and this might save us RPC on later STAT. For
1675                          * directories, it also let negative dentry cache start
1676                          * working for this dir. */
1677                         if (ma->ma_valid & MA_INODE &&
1678                             ma->ma_attr.la_valid & LA_CTIME &&
1679                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1680                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1681                                 child_bits |= MDS_INODELOCK_UPDATE;
1682                 }
1683
1684                 /* layout lock must be granted in a best-effort way
1685                  * for IT operations */
1686                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1687                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1688                     exp_connect_layout(info->mti_exp) &&
1689                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1690                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1691                         /* try to grant layout lock for regular file. */
1692                         try_layout = true;
1693                 }
1694
1695                 rc = 0;
1696                 if (try_layout) {
1697                         child_bits |= MDS_INODELOCK_LAYOUT;
1698                         /* try layout lock, it may fail to be granted due to
1699                          * contention at LOOKUP or UPDATE */
1700                         if (!mdt_object_lock_try(info, child, lhc,
1701                                                  child_bits)) {
1702                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1703                                 LASSERT(child_bits != 0);
1704                                 rc = mdt_object_lock(info, child, lhc,
1705                                                      child_bits);
1706                         } else {
1707                                 ma_need |= MA_LOV;
1708                         }
1709                 } else {
1710                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1711                          * client will enqueue the lock to the remote MDT */
1712                         if (mdt_object_remote(child))
1713                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1714                         rc = mdt_object_lock(info, child, lhc, child_bits);
1715                 }
1716                 if (unlikely(rc != 0))
1717                         GOTO(out_child, rc);
1718         }
1719
1720         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1721
1722         /* finally, we can get attr for child. */
1723         rc = mdt_getattr_internal(info, child, ma_need);
1724         if (unlikely(rc != 0)) {
1725                 mdt_object_unlock(info, child, lhc, 1);
1726         } else if (lock) {
1727                 /* Debugging code. */
1728                 LDLM_DEBUG(lock, "Returning lock to client");
1729                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1730                                          &lock->l_resource->lr_name),
1731                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1732                          PLDLMRES(lock->l_resource),
1733                          PFID(mdt_object_fid(child)));
1734         }
1735         if (lock)
1736                 LDLM_LOCK_PUT(lock);
1737
1738         EXIT;
1739 out_child:
1740         mdt_object_put(info->mti_env, child);
1741 out_parent:
1742         if (lhp)
1743                 mdt_object_unlock(info, parent, lhp, 1);
1744         return rc;
1745 }
1746
1747 /* normal handler: should release the child lock */
1748 static int mdt_getattr_name(struct tgt_session_info *tsi)
1749 {
1750         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1751         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1752         struct mdt_body        *reqbody;
1753         struct mdt_body        *repbody;
1754         int rc, rc2;
1755         ENTRY;
1756
1757         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1758         LASSERT(reqbody != NULL);
1759         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1760         LASSERT(repbody != NULL);
1761
1762         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1763         repbody->mbo_eadatasize = 0;
1764         repbody->mbo_aclsize = 0;
1765
1766         rc = mdt_init_ucred_intent_getattr(info, reqbody);
1767         if (unlikely(rc))
1768                 GOTO(out_shrink, rc);
1769
1770         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1771         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1772                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1773                 lhc->mlh_reg_lh.cookie = 0;
1774         }
1775         mdt_exit_ucred(info);
1776         EXIT;
1777 out_shrink:
1778         mdt_client_compatibility(info);
1779         rc2 = mdt_fix_reply(info);
1780         if (rc == 0)
1781                 rc = rc2;
1782         mdt_thread_info_fini(info);
1783         return rc;
1784 }
1785
1786 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1787                          void *karg, void __user *uarg);
1788
1789 static int mdt_set_info(struct tgt_session_info *tsi)
1790 {
1791         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1792         char                    *key;
1793         void                    *val;
1794         int                      keylen, vallen, rc = 0;
1795
1796         ENTRY;
1797
1798         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1799         if (key == NULL) {
1800                 DEBUG_REQ(D_HA, req, "no set_info key");
1801                 RETURN(err_serious(-EFAULT));
1802         }
1803
1804         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1805                                       RCL_CLIENT);
1806
1807         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1808         if (val == NULL) {
1809                 DEBUG_REQ(D_HA, req, "no set_info val");
1810                 RETURN(err_serious(-EFAULT));
1811         }
1812
1813         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1814                                       RCL_CLIENT);
1815
1816         /* Swab any part of val you need to here */
1817         if (KEY_IS(KEY_READ_ONLY)) {
1818                 spin_lock(&req->rq_export->exp_lock);
1819                 if (*(__u32 *)val)
1820                         *exp_connect_flags_ptr(req->rq_export) |=
1821                                 OBD_CONNECT_RDONLY;
1822                 else
1823                         *exp_connect_flags_ptr(req->rq_export) &=
1824                                 ~OBD_CONNECT_RDONLY;
1825                 spin_unlock(&req->rq_export->exp_lock);
1826         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1827                 struct changelog_setinfo *cs = val;
1828
1829                 if (vallen != sizeof(*cs)) {
1830                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1831                                tgt_name(tsi->tsi_tgt), vallen);
1832                         RETURN(-EINVAL);
1833                 }
1834                 if (ptlrpc_req_need_swab(req)) {
1835                         __swab64s(&cs->cs_recno);
1836                         __swab32s(&cs->cs_id);
1837                 }
1838
1839                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1840                                    vallen, val, NULL);
1841         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
1842                 if (vallen > 0)
1843                         obd_export_evict_by_nid(req->rq_export->exp_obd, val);
1844         } else {
1845                 RETURN(-EINVAL);
1846         }
1847         RETURN(rc);
1848 }
1849
1850 static int mdt_readpage(struct tgt_session_info *tsi)
1851 {
1852         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1853         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1854         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1855         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1856         struct mdt_body         *repbody;
1857         int                      rc;
1858         int                      i;
1859
1860         ENTRY;
1861
1862         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1863                 RETURN(err_serious(-ENOMEM));
1864
1865         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1866         if (repbody == NULL || reqbody == NULL)
1867                 RETURN(err_serious(-EFAULT));
1868
1869         /*
1870          * prepare @rdpg before calling lower layers and transfer itself. Here
1871          * reqbody->size contains offset of where to start to read and
1872          * reqbody->nlink contains number bytes to read.
1873          */
1874         rdpg->rp_hash = reqbody->mbo_size;
1875         if (rdpg->rp_hash != reqbody->mbo_size) {
1876                 CERROR("Invalid hash: %#llx != %#llx\n",
1877                        rdpg->rp_hash, reqbody->mbo_size);
1878                 RETURN(-EFAULT);
1879         }
1880
1881         rdpg->rp_attrs = reqbody->mbo_mode;
1882         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1883                 rdpg->rp_attrs |= LUDA_64BITHASH;
1884         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1885                                 exp_max_brw_size(tsi->tsi_exp));
1886         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >>
1887                           PAGE_SHIFT;
1888         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1889         if (rdpg->rp_pages == NULL)
1890                 RETURN(-ENOMEM);
1891
1892         for (i = 0; i < rdpg->rp_npages; ++i) {
1893                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1894                 if (rdpg->rp_pages[i] == NULL)
1895                         GOTO(free_rdpg, rc = -ENOMEM);
1896         }
1897
1898         /* call lower layers to fill allocated pages with directory data */
1899         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1900         if (rc < 0)
1901                 GOTO(free_rdpg, rc);
1902
1903         /* send pages to client */
1904         rc = tgt_sendpage(tsi, rdpg, rc);
1905
1906         EXIT;
1907 free_rdpg:
1908
1909         for (i = 0; i < rdpg->rp_npages; i++)
1910                 if (rdpg->rp_pages[i] != NULL)
1911                         __free_page(rdpg->rp_pages[i]);
1912         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1913
1914         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1915                 RETURN(0);
1916
1917         return rc;
1918 }
1919
1920 static int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
1921 {
1922         struct lu_ucred *uc = mdt_ucred_check(info);
1923         struct lu_attr *attr = &info->mti_attr.ma_attr;
1924
1925         if (uc == NULL)
1926                 return -EINVAL;
1927
1928         if (op != REINT_SETATTR) {
1929                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
1930                         attr->la_uid = uc->uc_fsuid;
1931                 /* for S_ISGID, inherit gid from his parent, such work will be
1932                  * done in cmm/mdd layer, here set all cases as uc->uc_fsgid. */
1933                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
1934                         attr->la_gid = uc->uc_fsgid;
1935         }
1936
1937         return 0;
1938 }
1939
1940 static int mdt_reint_internal(struct mdt_thread_info *info,
1941                               struct mdt_lock_handle *lhc,
1942                               __u32 op)
1943 {
1944         struct req_capsule      *pill = info->mti_pill;
1945         struct mdt_body         *repbody;
1946         int                      rc = 0, rc2;
1947
1948         ENTRY;
1949
1950         rc = mdt_reint_unpack(info, op);
1951         if (rc != 0) {
1952                 CERROR("Can't unpack reint, rc %d\n", rc);
1953                 RETURN(err_serious(rc));
1954         }
1955
1956         /* for replay (no_create) lmm is not needed, client has it already */
1957         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1958                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1959                                      DEF_REP_MD_SIZE);
1960
1961         /* llog cookies are always 0, the field is kept for compatibility */
1962         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1963                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1964
1965         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
1966          * by default. If the target object has more ACL entries, then
1967          * enlarge the buffer when necessary. */
1968         if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
1969                 req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
1970                                      LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
1971
1972         rc = req_capsule_server_pack(pill);
1973         if (rc != 0) {
1974                 CERROR("Can't pack response, rc %d\n", rc);
1975                 RETURN(err_serious(rc));
1976         }
1977
1978         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1979                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1980                 LASSERT(repbody);
1981                 repbody->mbo_eadatasize = 0;
1982                 repbody->mbo_aclsize = 0;
1983         }
1984
1985         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1986
1987         /* for replay no cookkie / lmm need, because client have this already */
1988         if (info->mti_spec.no_create)
1989                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1990                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1991
1992         rc = mdt_init_ucred_reint(info);
1993         if (rc)
1994                 GOTO(out_shrink, rc);
1995
1996         rc = mdt_fix_attr_ucred(info, op);
1997         if (rc != 0)
1998                 GOTO(out_ucred, rc = err_serious(rc));
1999
2000         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
2001         if (rc < 0) {
2002                 GOTO(out_ucred, rc);
2003         } else if (rc == 1) {
2004                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
2005                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
2006                 GOTO(out_ucred, rc);
2007         }
2008         rc = mdt_reint_rec(info, lhc);
2009         EXIT;
2010 out_ucred:
2011         mdt_exit_ucred(info);
2012 out_shrink:
2013         mdt_client_compatibility(info);
2014         rc2 = mdt_fix_reply(info);
2015         if (rc == 0)
2016                 rc = rc2;
2017         return rc;
2018 }
2019
2020 static long mdt_reint_opcode(struct ptlrpc_request *req,
2021                              const struct req_format **fmt)
2022 {
2023         struct mdt_device       *mdt;
2024         struct mdt_rec_reint    *rec;
2025         long                     opc;
2026
2027         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
2028         if (rec != NULL) {
2029                 opc = rec->rr_opcode;
2030                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
2031                 if (opc < REINT_MAX && fmt[opc] != NULL)
2032                         req_capsule_extend(&req->rq_pill, fmt[opc]);
2033                 else {
2034                         mdt = mdt_exp2dev(req->rq_export);
2035                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
2036                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
2037                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
2038                         opc = err_serious(-EFAULT);
2039                 }
2040         } else {
2041                 opc = err_serious(-EFAULT);
2042         }
2043         return opc;
2044 }
2045
2046 static int mdt_reint(struct tgt_session_info *tsi)
2047 {
2048         long opc;
2049         int  rc;
2050         static const struct req_format *reint_fmts[REINT_MAX] = {
2051                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
2052                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
2053                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
2054                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
2055                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
2056                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
2057                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
2058                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
2059                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
2060         };
2061
2062         ENTRY;
2063
2064         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
2065         if (opc >= 0) {
2066                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2067                 /*
2068                  * No lock possible here from client to pass it to reint code
2069                  * path.
2070                  */
2071                 rc = mdt_reint_internal(info, NULL, opc);
2072                 mdt_thread_info_fini(info);
2073         } else {
2074                 rc = opc;
2075         }
2076
2077         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
2078         RETURN(rc);
2079 }
2080
2081 /* this should sync the whole device */
2082 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
2083 {
2084         struct dt_device *dt = mdt->mdt_bottom;
2085         int rc;
2086         ENTRY;
2087
2088         rc = dt->dd_ops->dt_sync(env, dt);
2089         RETURN(rc);
2090 }
2091
2092 /* this should sync this object */
2093 static int mdt_object_sync(struct mdt_thread_info *info)
2094 {
2095         struct md_object *next;
2096         int rc;
2097         ENTRY;
2098
2099         if (!mdt_object_exists(info->mti_object)) {
2100                 CWARN("%s: non existing object "DFID": rc = %d\n",
2101                       mdt_obd_name(info->mti_mdt),
2102                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
2103                 RETURN(-ESTALE);
2104         }
2105         next = mdt_object_child(info->mti_object);
2106         rc = mo_object_sync(info->mti_env, next);
2107
2108         RETURN(rc);
2109 }
2110
2111 static int mdt_sync(struct tgt_session_info *tsi)
2112 {
2113         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2114         struct req_capsule      *pill = tsi->tsi_pill;
2115         struct mdt_body         *body;
2116         int                      rc;
2117
2118         ENTRY;
2119
2120         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
2121                 RETURN(err_serious(-ENOMEM));
2122
2123         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
2124                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
2125         } else {
2126                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2127
2128                 /* sync an object */
2129                 rc = mdt_object_sync(info);
2130                 if (rc == 0) {
2131                         const struct lu_fid *fid;
2132                         struct lu_attr *la = &info->mti_attr.ma_attr;
2133
2134                         info->mti_attr.ma_need = MA_INODE;
2135                         info->mti_attr.ma_valid = 0;
2136                         rc = mdt_attr_get_complex(info, info->mti_object,
2137                                                   &info->mti_attr);
2138                         if (rc == 0) {
2139                                 body = req_capsule_server_get(pill,
2140                                                               &RMF_MDT_BODY);
2141                                 fid = mdt_object_fid(info->mti_object);
2142                                 mdt_pack_attr2body(info, body, la, fid);
2143                         }
2144                 }
2145                 mdt_thread_info_fini(info);
2146         }
2147         if (rc == 0)
2148                 mdt_counter_incr(req, LPROC_MDT_SYNC);
2149
2150         RETURN(rc);
2151 }
2152
2153 /*
2154  * Handle quota control requests to consult current usage/limit, but also
2155  * to configure quota enforcement
2156  */
2157 static int mdt_quotactl(struct tgt_session_info *tsi)
2158 {
2159         struct obd_export       *exp  = tsi->tsi_exp;
2160         struct req_capsule      *pill = tsi->tsi_pill;
2161         struct obd_quotactl     *oqctl, *repoqc;
2162         int                      id, rc;
2163         struct mdt_device       *mdt = mdt_exp2dev(exp);
2164         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2165         struct lu_nodemap       *nodemap;
2166         ENTRY;
2167
2168         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2169         if (oqctl == NULL)
2170                 RETURN(err_serious(-EPROTO));
2171
2172         rc = req_capsule_server_pack(pill);
2173         if (rc)
2174                 RETURN(err_serious(rc));
2175
2176         nodemap = nodemap_get_from_exp(exp);
2177         if (IS_ERR(nodemap))
2178                 RETURN(PTR_ERR(nodemap));
2179
2180         switch (oqctl->qc_cmd) {
2181                 /* master quotactl */
2182         case Q_SETINFO:
2183         case Q_SETQUOTA:
2184                 if (!nodemap_can_setquota(nodemap))
2185                         GOTO(out_nodemap, rc = -EPERM);
2186         case Q_GETINFO:
2187         case Q_GETQUOTA:
2188                 if (qmt == NULL)
2189                         GOTO(out_nodemap, rc = -EOPNOTSUPP);
2190                 /* slave quotactl */
2191         case Q_GETOINFO:
2192         case Q_GETOQUOTA:
2193                 break;
2194         default:
2195                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2196                 GOTO(out_nodemap, rc = -EFAULT);
2197         }
2198
2199         id = oqctl->qc_id;
2200         switch (oqctl->qc_type) {
2201         case USRQUOTA:
2202                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2203                                     NODEMAP_CLIENT_TO_FS, id);
2204                 break;
2205         case GRPQUOTA:
2206                 id = nodemap_map_id(nodemap, NODEMAP_GID,
2207                                     NODEMAP_CLIENT_TO_FS, id);
2208                 break;
2209         case PRJQUOTA:
2210                 /* todo: check/map project id */
2211                 id = oqctl->qc_id;
2212                 break;
2213         default:
2214                 GOTO(out_nodemap, rc = -EOPNOTSUPP);
2215         }
2216         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2217         if (repoqc == NULL)
2218                 GOTO(out_nodemap, rc = err_serious(-EFAULT));
2219
2220         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA)
2221                 barrier_exit(tsi->tsi_tgt->lut_bottom);
2222
2223         if (oqctl->qc_id != id)
2224                 swap(oqctl->qc_id, id);
2225
2226         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA) {
2227                 if (unlikely(!barrier_entry(tsi->tsi_tgt->lut_bottom)))
2228                         RETURN(-EINPROGRESS);
2229         }
2230
2231         switch (oqctl->qc_cmd) {
2232
2233         case Q_GETINFO:
2234         case Q_SETINFO:
2235         case Q_SETQUOTA:
2236         case Q_GETQUOTA:
2237                 /* forward quotactl request to QMT */
2238                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2239                 break;
2240
2241         case Q_GETOINFO:
2242         case Q_GETOQUOTA:
2243                 /* slave quotactl */
2244                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2245                                    oqctl);
2246                 break;
2247
2248         default:
2249                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2250                 GOTO(out_nodemap, rc = -EFAULT);
2251         }
2252
2253         if (oqctl->qc_id != id)
2254                 swap(oqctl->qc_id, id);
2255
2256         *repoqc = *oqctl;
2257
2258         EXIT;
2259
2260 out_nodemap:
2261         nodemap_putref(nodemap);
2262
2263         return rc;
2264 }
2265
2266 /** clone llog ctxt from child (mdd)
2267  * This allows remote llog (replicator) access.
2268  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2269  * context was originally set up, or we can handle them directly.
2270  * I choose the latter, but that means I need any llog
2271  * contexts set up by child to be accessable by the mdt.  So we clone the
2272  * context into our context list here.
2273  */
2274 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2275                                int idx)
2276 {
2277         struct md_device  *next = mdt->mdt_child;
2278         struct llog_ctxt *ctxt;
2279         int rc;
2280
2281         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2282                 return 0;
2283
2284         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2285         if (rc || ctxt == NULL) {
2286                 return 0;
2287         }
2288
2289         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2290         if (rc)
2291                 CERROR("Can't set mdt ctxt %d\n", rc);
2292
2293         return rc;
2294 }
2295
2296 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2297                                  struct mdt_device *mdt, int idx)
2298 {
2299         struct llog_ctxt *ctxt;
2300
2301         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2302         if (ctxt == NULL)
2303                 return 0;
2304         /* Put once for the get we just did, and once for the clone */
2305         llog_ctxt_put(ctxt);
2306         llog_ctxt_put(ctxt);
2307         return 0;
2308 }
2309
2310 /*
2311  * sec context handlers
2312  */
2313 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2314 {
2315         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2316
2317         return 0;
2318 }
2319
2320 /*
2321  * quota request handlers
2322  */
2323 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2324 {
2325         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2326         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2327         int                      rc;
2328         ENTRY;
2329
2330         if (qmt == NULL)
2331                 RETURN(err_serious(-EOPNOTSUPP));
2332
2333         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2334         RETURN(rc);
2335 }
2336
2337 struct mdt_object *mdt_object_new(const struct lu_env *env,
2338                                   struct mdt_device *d,
2339                                   const struct lu_fid *f)
2340 {
2341         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2342         struct lu_object *o;
2343         struct mdt_object *m;
2344         ENTRY;
2345
2346         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2347         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2348         if (unlikely(IS_ERR(o)))
2349                 m = (struct mdt_object *)o;
2350         else
2351                 m = mdt_obj(o);
2352         RETURN(m);
2353 }
2354
2355 struct mdt_object *mdt_object_find(const struct lu_env *env,
2356                                    struct mdt_device *d,
2357                                    const struct lu_fid *f)
2358 {
2359         struct lu_object *o;
2360         struct mdt_object *m;
2361         ENTRY;
2362
2363         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2364         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2365         if (unlikely(IS_ERR(o)))
2366                 m = (struct mdt_object *)o;
2367         else
2368                 m = mdt_obj(o);
2369
2370         RETURN(m);
2371 }
2372
2373 /**
2374  * Asyncronous commit for mdt device.
2375  *
2376  * Pass asynchonous commit call down the MDS stack.
2377  *
2378  * \param env environment
2379  * \param mdt the mdt device
2380  */
2381 static void mdt_device_commit_async(const struct lu_env *env,
2382                                     struct mdt_device *mdt)
2383 {
2384         struct dt_device *dt = mdt->mdt_bottom;
2385         int rc;
2386         ENTRY;
2387
2388         rc = dt->dd_ops->dt_commit_async(env, dt);
2389         if (unlikely(rc != 0))
2390                 CWARN("%s: async commit start failed: rc = %d\n",
2391                       mdt_obd_name(mdt), rc);
2392         atomic_inc(&mdt->mdt_async_commit_count);
2393         EXIT;
2394 }
2395
2396 /**
2397  * Mark the lock as "synchonous".
2398  *
2399  * Mark the lock to deffer transaction commit to the unlock time.
2400  *
2401  * \param lock the lock to mark as "synchonous"
2402  *
2403  * \see mdt_is_lock_sync
2404  * \see mdt_save_lock
2405  */
2406 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2407 {
2408         lock->l_ast_data = (void*)1;
2409 }
2410
2411 /**
2412  * Check whehter the lock "synchonous" or not.
2413  *
2414  * \param lock the lock to check
2415  * \retval 1 the lock is "synchonous"
2416  * \retval 0 the lock isn't "synchronous"
2417  *
2418  * \see mdt_set_lock_sync
2419  * \see mdt_save_lock
2420  */
2421 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2422 {
2423         return lock->l_ast_data != NULL;
2424 }
2425
2426 /**
2427  * Blocking AST for mdt locks.
2428  *
2429  * Starts transaction commit if in case of COS lock conflict or
2430  * deffers such a commit to the mdt_save_lock.
2431  *
2432  * \param lock the lock which blocks a request or cancelling lock
2433  * \param desc unused
2434  * \param data unused
2435  * \param flag indicates whether this cancelling or blocking callback
2436  * \retval 0
2437  * \see ldlm_blocking_ast_nocheck
2438  */
2439 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2440                      void *data, int flag)
2441 {
2442         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2443         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2444         bool commit_async = false;
2445         int rc;
2446         ENTRY;
2447
2448         if (flag == LDLM_CB_CANCELING)
2449                 RETURN(0);
2450
2451         lock_res_and_lock(lock);
2452         if (lock->l_blocking_ast != mdt_blocking_ast) {
2453                 unlock_res_and_lock(lock);
2454                 RETURN(0);
2455         }
2456         /* There is no lock conflict if l_blocking_lock == NULL,
2457          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2458          * when the last reference to a local lock was released */
2459         if (lock->l_req_mode & (LCK_PW | LCK_EX) &&
2460             lock->l_blocking_lock != NULL) {
2461                 if (mdt_cos_is_enabled(mdt)) {
2462                         if (lock->l_client_cookie !=
2463                             lock->l_blocking_lock->l_client_cookie)
2464                                 mdt_set_lock_sync(lock);
2465                 } else if (mdt_slc_is_enabled(mdt) &&
2466                            ldlm_is_cos_incompat(lock->l_blocking_lock)) {
2467                         mdt_set_lock_sync(lock);
2468                         /*
2469                          * we may do extra commit here, but there is a small
2470                          * window to miss a commit: lock was unlocked (saved),
2471                          * then a conflict lock queued and we come here, but
2472                          * REP-ACK not received, so lock was not converted to
2473                          * COS mode yet.
2474                          * Fortunately this window is quite small, so the
2475                          * extra commit should be rare (not to say distributed
2476                          * operation is rare too).
2477                          */
2478                         commit_async = true;
2479                 }
2480         } else if (lock->l_req_mode == LCK_COS &&
2481                    lock->l_blocking_lock != NULL) {
2482                 commit_async = true;
2483         }
2484
2485         rc = ldlm_blocking_ast_nocheck(lock);
2486
2487         if (commit_async) {
2488                 struct lu_env env;
2489
2490                 rc = lu_env_init(&env, LCT_LOCAL);
2491                 if (unlikely(rc != 0))
2492                         CWARN("%s: lu_env initialization failed, cannot "
2493                               "start asynchronous commit: rc = %d\n",
2494                               obd->obd_name, rc);
2495                 else
2496                         mdt_device_commit_async(&env, mdt);
2497                 lu_env_fini(&env);
2498         }
2499         RETURN(rc);
2500 }
2501
2502 /*
2503  * Blocking AST for cross-MDT lock
2504  *
2505  * Discard lock from uncommitted_slc_locks and cancel it.
2506  *
2507  * \param lock  the lock which blocks a request or cancelling lock
2508  * \param desc  unused
2509  * \param data  unused
2510  * \param flag  indicates whether this cancelling or blocking callback
2511  * \retval      0 on success
2512  * \retval      negative number on error
2513  */
2514 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2515                             void *data, int flag)
2516 {
2517         int rc = 0;
2518         ENTRY;
2519
2520         switch (flag) {
2521         case LDLM_CB_BLOCKING: {
2522                 struct lustre_handle lockh;
2523
2524                 ldlm_lock2handle(lock, &lockh);
2525                 rc = ldlm_cli_cancel(&lockh,
2526                         ldlm_is_atomic_cb(lock) ? 0 : LCF_ASYNC);
2527                 if (rc < 0) {
2528                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2529                         RETURN(rc);
2530                 }
2531                 break;
2532         }
2533         case LDLM_CB_CANCELING: {
2534                 struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2535                 struct mdt_device *mdt =
2536                                 mdt_dev(obd->obd_lu_dev->ld_site->ls_top_dev);
2537
2538                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2539
2540                 /* discard slc lock here so that it can be cleaned anytime,
2541                  * especially for cleanup_resource() */
2542                 tgt_discard_slc_lock(&mdt->mdt_lut, lock);
2543
2544                 /* once we cache lock, l_ast_data is set to mdt_object */
2545                 if (lock->l_ast_data != NULL) {
2546                         struct mdt_object *mo = lock->l_ast_data;
2547                         struct lu_env env;
2548
2549                         rc = lu_env_init(&env, LCT_MD_THREAD);
2550                         if (unlikely(rc != 0)) {
2551                                 CWARN("%s: lu_env initialization failed, object"
2552                                       "%p "DFID" is leaked!\n",
2553                                       obd->obd_name, mo,
2554                                       PFID(mdt_object_fid(mo)));
2555                                 RETURN(rc);
2556                         }
2557
2558                         if (lock->l_policy_data.l_inodebits.bits &
2559                             (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)) {
2560                                 rc = mo_invalidate(&env, mdt_object_child(mo));
2561                                 mo->mot_cache_attr = 0;
2562                         }
2563                         mdt_object_put(&env, mo);
2564                         lu_env_fini(&env);
2565                 }
2566                 break;
2567         }
2568         default:
2569                 LBUG();
2570         }
2571
2572         RETURN(rc);
2573 }
2574
2575 int mdt_check_resent_lock(struct mdt_thread_info *info,
2576                           struct mdt_object *mo,
2577                           struct mdt_lock_handle *lhc)
2578 {
2579         /* the lock might already be gotten in ldlm_handle_enqueue() */
2580         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2581                 struct ptlrpc_request *req = mdt_info_req(info);
2582                 struct ldlm_lock      *lock;
2583
2584                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2585                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2586                 if (lock == NULL) {
2587                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2588                          * a resend case, however, it could be already destroyed
2589                          * due to client eviction or a raced cancel RPC. */
2590                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx",
2591                                           lhc->mlh_reg_lh.cookie);
2592                         RETURN(-ESTALE);
2593                 }
2594
2595                 if (!fid_res_name_eq(mdt_object_fid(mo),
2596                                      &lock->l_resource->lr_name)) {
2597                         CWARN("%s: Although resent, but still not "
2598                               "get child lock:"DFID"\n",
2599                               info->mti_exp->exp_obd->obd_name,
2600                               PFID(mdt_object_fid(mo)));
2601                         LDLM_LOCK_PUT(lock);
2602                         RETURN(-EPROTO);
2603                 }
2604                 LDLM_LOCK_PUT(lock);
2605                 return 0;
2606         }
2607         return 1;
2608 }
2609
2610 int mdt_remote_object_lock(struct mdt_thread_info *mti, struct mdt_object *o,
2611                            const struct lu_fid *fid, struct lustre_handle *lh,
2612                            enum ldlm_mode mode, __u64 ibits, bool nonblock,
2613                            bool cache)
2614 {
2615         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2616         union ldlm_policy_data *policy = &mti->mti_policy;
2617         struct ldlm_res_id *res_id = &mti->mti_res_id;
2618         int rc = 0;
2619         ENTRY;
2620
2621         LASSERT(mdt_object_remote(o));
2622
2623         fid_build_reg_res_name(fid, res_id);
2624
2625         memset(einfo, 0, sizeof(*einfo));
2626         einfo->ei_type = LDLM_IBITS;
2627         einfo->ei_mode = mode;
2628         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2629         einfo->ei_cb_cp = ldlm_completion_ast;
2630         einfo->ei_enq_slave = 0;
2631         einfo->ei_res_id = res_id;
2632         if (nonblock)
2633                 einfo->ei_nonblock = 1;
2634         if (cache) {
2635                 /*
2636                  * if we cache lock, couple lock with mdt_object, so that object
2637                  * can be easily found in lock ASTs.
2638                  */
2639                 mdt_object_get(mti->mti_env, o);
2640                 einfo->ei_cbdata = o;
2641         }
2642
2643         memset(policy, 0, sizeof(*policy));
2644         policy->l_inodebits.bits = ibits;
2645
2646         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2647                             policy);
2648         if (rc < 0 && cache) {
2649                 mdt_object_put(mti->mti_env, o);
2650                 einfo->ei_cbdata = NULL;
2651         }
2652         RETURN(rc);
2653 }
2654
2655 static int mdt_object_local_lock(struct mdt_thread_info *info,
2656                                  struct mdt_object *o,
2657                                  struct mdt_lock_handle *lh, __u64 ibits,
2658                                  bool nonblock, bool cos_incompat)
2659 {
2660         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2661         union ldlm_policy_data *policy = &info->mti_policy;
2662         struct ldlm_res_id *res_id = &info->mti_res_id;
2663         __u64 dlmflags = 0;
2664         int rc;
2665         ENTRY;
2666
2667         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2668         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2669         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2670         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2671
2672         if (cos_incompat) {
2673                 LASSERT(lh->mlh_reg_mode == LCK_PW ||
2674                         lh->mlh_reg_mode == LCK_EX);
2675                 dlmflags |= LDLM_FL_COS_INCOMPAT;
2676         } else if (mdt_cos_is_enabled(info->mti_mdt)) {
2677                 dlmflags |= LDLM_FL_COS_ENABLED;
2678         }
2679
2680         /* Only enqueue LOOKUP lock for remote object */
2681         if (mdt_object_remote(o))
2682                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2683
2684         if (lh->mlh_type == MDT_PDO_LOCK) {
2685                 /* check for exists after object is locked */
2686                 if (mdt_object_exists(o) == 0) {
2687                         /* Non-existent object shouldn't have PDO lock */
2688                         RETURN(-ESTALE);
2689                 } else {
2690                         /* Non-dir object shouldn't have PDO lock */
2691                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2692                                 RETURN(-ENOTDIR);
2693                 }
2694         }
2695
2696         memset(policy, 0, sizeof(*policy));
2697         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2698
2699         dlmflags |= LDLM_FL_ATOMIC_CB;
2700         if (nonblock)
2701                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2702
2703         /*
2704          * Take PDO lock on whole directory and build correct @res_id for lock
2705          * on part of directory.
2706          */
2707         if (lh->mlh_pdo_hash != 0) {
2708                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2709                 mdt_lock_pdo_mode(info, o, lh);
2710                 if (lh->mlh_pdo_mode != LCK_NL) {
2711                         /*
2712                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2713                          * is never going to be sent to client and we do not
2714                          * want it slowed down due to possible cancels.
2715                          */
2716                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2717                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2718                                           policy, res_id, dlmflags,
2719                                           info->mti_exp == NULL ? NULL :
2720                                           &info->mti_exp->exp_handle.h_cookie);
2721                         if (unlikely(rc != 0))
2722                                 GOTO(out_unlock, rc);
2723                 }
2724
2725                 /*
2726                  * Finish res_id initializing by name hash marking part of
2727                  * directory which is taking modification.
2728                  */
2729                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2730         }
2731
2732         policy->l_inodebits.bits = ibits;
2733
2734         /*
2735          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2736          * going to be sent to client. If it is - mdt_intent_policy() path will
2737          * fix it up and turn FL_LOCAL flag off.
2738          */
2739         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2740                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2741                           info->mti_exp == NULL ? NULL :
2742                           &info->mti_exp->exp_handle.h_cookie);
2743 out_unlock:
2744         if (rc != 0)
2745                 mdt_object_unlock(info, o, lh, 1);
2746         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2747                    lh->mlh_pdo_hash != 0 &&
2748                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2749                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2750
2751         RETURN(rc);
2752 }
2753
2754 static int
2755 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2756                          struct mdt_lock_handle *lh, __u64 ibits, bool nonblock,
2757                          bool cos_incompat)
2758 {
2759         struct mdt_lock_handle *local_lh = NULL;
2760         int rc;
2761         ENTRY;
2762
2763         if (!mdt_object_remote(o)) {
2764                 rc = mdt_object_local_lock(info, o, lh, ibits, nonblock,
2765                                            cos_incompat);
2766                 RETURN(rc);
2767         }
2768
2769         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2770         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2771                    MDS_INODELOCK_XATTR);
2772
2773         /* Only enqueue LOOKUP lock for remote object */
2774         if (ibits & MDS_INODELOCK_LOOKUP) {
2775                 rc = mdt_object_local_lock(info, o, lh, MDS_INODELOCK_LOOKUP,
2776                                            nonblock, cos_incompat);
2777                 if (rc != ELDLM_OK)
2778                         RETURN(rc);
2779
2780                 local_lh = lh;
2781         }
2782
2783         if (ibits & MDS_INODELOCK_UPDATE) {
2784                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2785                  * enqueue RPC can only request 1 lock, to avoid extra
2786                  * RPC, so it will instead enqueue EX lock for remote
2787                  * object anyway XXX*/
2788                 if (lh->mlh_type == MDT_PDO_LOCK &&
2789                     lh->mlh_pdo_hash != 0) {
2790                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2791                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2792                                PFID(mdt_object_fid(o)));
2793                         lh->mlh_pdo_hash = 0;
2794                         lh->mlh_rreg_mode = LCK_EX;
2795                         lh->mlh_type = MDT_REG_LOCK;
2796                 }
2797                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2798                                             &lh->mlh_rreg_lh,
2799                                             lh->mlh_rreg_mode,
2800                                             MDS_INODELOCK_UPDATE, nonblock,
2801                                             false);
2802                 if (rc != ELDLM_OK) {
2803                         if (local_lh != NULL)
2804                                 mdt_object_unlock(info, o, local_lh, rc);
2805                         RETURN(rc);
2806                 }
2807         }
2808
2809         RETURN(0);
2810 }
2811
2812 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2813                     struct mdt_lock_handle *lh, __u64 ibits)
2814 {
2815         return mdt_object_lock_internal(info, o, lh, ibits, false, false);
2816 }
2817
2818 int mdt_reint_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2819                           struct mdt_lock_handle *lh, __u64 ibits,
2820                           bool cos_incompat)
2821 {
2822         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2823         return mdt_object_lock_internal(info, o, lh, ibits, false,
2824                                         cos_incompat);
2825 }
2826
2827 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2828                         struct mdt_lock_handle *lh, __u64 ibits)
2829 {
2830         struct mdt_lock_handle tmp = *lh;
2831         int rc;
2832
2833         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, false);
2834         if (rc == 0)
2835                 *lh = tmp;
2836
2837         return rc == 0;
2838 }
2839
2840 int mdt_reint_object_lock_try(struct mdt_thread_info *info,
2841                               struct mdt_object *o, struct mdt_lock_handle *lh,
2842                               __u64 ibits, bool cos_incompat)
2843 {
2844         struct mdt_lock_handle tmp = *lh;
2845         int rc;
2846
2847         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2848         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, cos_incompat);
2849         if (rc == 0)
2850                 *lh = tmp;
2851
2852         return rc == 0;
2853 }
2854
2855 /**
2856  * Save a lock within request object.
2857  *
2858  * Keep the lock referenced until whether client ACK or transaction
2859  * commit happens or release the lock immediately depending on input
2860  * parameters. If COS is ON, a write lock is converted to COS lock
2861  * before saving.
2862  *
2863  * \param info thead info object
2864  * \param h lock handle
2865  * \param mode lock mode
2866  * \param decref force immediate lock releasing
2867  */
2868 static void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2869                           enum ldlm_mode mode, int decref)
2870 {
2871         ENTRY;
2872
2873         if (lustre_handle_is_used(h)) {
2874                 if (decref || !info->mti_has_trans ||
2875                     !(mode & (LCK_PW | LCK_EX))) {
2876                         mdt_fid_unlock(h, mode);
2877                 } else {
2878                         struct mdt_device *mdt = info->mti_mdt;
2879                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2880                         struct ptlrpc_request *req = mdt_info_req(info);
2881                         bool cos = mdt_cos_is_enabled(mdt);
2882                         bool convert_lock = !cos && mdt_slc_is_enabled(mdt);
2883
2884                         LASSERTF(lock != NULL, "no lock for cookie %#llx\n",
2885                                  h->cookie);
2886
2887                         /* there is no request if mdt_object_unlock() is called
2888                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2889                         if (likely(req != NULL)) {
2890                                 LDLM_DEBUG(lock, "save lock request %p reply "
2891                                         "state %p transno %lld\n", req,
2892                                         req->rq_reply_state, req->rq_transno);
2893                                 if (cos) {
2894                                         ldlm_lock_downgrade(lock, LCK_COS);
2895                                         mode = LCK_COS;
2896                                 }
2897                                 ptlrpc_save_lock(req, h, mode, cos,
2898                                                  convert_lock);
2899                         } else {
2900                                 mdt_fid_unlock(h, mode);
2901                         }
2902                         if (mdt_is_lock_sync(lock)) {
2903                                 CDEBUG(D_HA, "found sync-lock,"
2904                                        " async commit started\n");
2905                                 mdt_device_commit_async(info->mti_env,
2906                                                         mdt);
2907                         }
2908                         LDLM_LOCK_PUT(lock);
2909                 }
2910                 h->cookie = 0ull;
2911         }
2912
2913         EXIT;
2914 }
2915
2916 /**
2917  * Save cross-MDT lock in uncommitted_slc_locks
2918  *
2919  * Keep the lock referenced until transaction commit happens or release the lock
2920  * immediately depending on input parameters.
2921  *
2922  * \param info thead info object
2923  * \param h lock handle
2924  * \param mode lock mode
2925  * \param decref force immediate lock releasing
2926  */
2927 static void mdt_save_remote_lock(struct mdt_thread_info *info,
2928                                  struct mdt_object *o, struct lustre_handle *h,
2929                                  enum ldlm_mode mode, int decref)
2930 {
2931         ENTRY;
2932
2933         if (lustre_handle_is_used(h)) {
2934                 struct ldlm_lock *lock = ldlm_handle2lock(h);
2935
2936                 if (o != NULL &&
2937                     (lock->l_policy_data.l_inodebits.bits &
2938                      (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)))
2939                         mo_invalidate(info->mti_env, mdt_object_child(o));
2940
2941                 if (decref || !info->mti_has_trans ||
2942                     !(mode & (LCK_PW | LCK_EX))) {
2943                         ldlm_lock_decref_and_cancel(h, mode);
2944                         LDLM_LOCK_PUT(lock);
2945                 } else {
2946                         struct ptlrpc_request *req = mdt_info_req(info);
2947
2948                         LASSERT(req != NULL);
2949                         tgt_save_slc_lock(&info->mti_mdt->mdt_lut, lock,
2950                                           req->rq_transno);
2951                         ldlm_lock_decref(h, mode);
2952                 }
2953                 h->cookie = 0ull;
2954         }
2955
2956         EXIT;
2957 }
2958
2959 /**
2960  * Unlock mdt object.
2961  *
2962  * Immeditely release the regular lock and the PDO lock or save the
2963  * lock in request and keep them referenced until client ACK or
2964  * transaction commit.
2965  *
2966  * \param info thread info object
2967  * \param o mdt object
2968  * \param lh mdt lock handle referencing regular and PDO locks
2969  * \param decref force immediate lock releasing
2970  *
2971  * XXX o is not used and may be NULL, see hsm_cdt_request_completed().
2972  */
2973 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2974                        struct mdt_lock_handle *lh, int decref)
2975 {
2976         ENTRY;
2977
2978         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2979         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2980         mdt_save_remote_lock(info, o, &lh->mlh_rreg_lh, lh->mlh_rreg_mode,
2981                              decref);
2982
2983         EXIT;
2984 }
2985
2986 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2987                                         const struct lu_fid *f,
2988                                         struct mdt_lock_handle *lh,
2989                                         __u64 ibits)
2990 {
2991         struct mdt_object *o;
2992
2993         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2994         if (!IS_ERR(o)) {
2995                 int rc;
2996
2997                 rc = mdt_object_lock(info, o, lh, ibits);
2998                 if (rc != 0) {
2999                         mdt_object_put(info->mti_env, o);
3000                         o = ERR_PTR(rc);
3001                 }
3002         }
3003         return o;
3004 }
3005
3006 void mdt_object_unlock_put(struct mdt_thread_info * info,
3007                            struct mdt_object * o,
3008                            struct mdt_lock_handle *lh,
3009                            int decref)
3010 {
3011         mdt_object_unlock(info, o, lh, decref);
3012         mdt_object_put(info->mti_env, o);
3013 }
3014
3015 /*
3016  * Generic code handling requests that have struct mdt_body passed in:
3017  *
3018  *  - extract mdt_body from request and save it in @info, if present;
3019  *
3020  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
3021  *  @info;
3022  *
3023  *  - if HABEO_CORPUS flag is set for this request type check whether object
3024  *  actually exists on storage (lu_object_exists()).
3025  *
3026  */
3027 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
3028 {
3029         const struct mdt_body    *body;
3030         struct mdt_object        *obj;
3031         const struct lu_env      *env;
3032         struct req_capsule       *pill;
3033         int                       rc;
3034         ENTRY;
3035
3036         env = info->mti_env;
3037         pill = info->mti_pill;
3038
3039         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
3040         if (body == NULL)
3041                 RETURN(-EFAULT);
3042
3043         if (!(body->mbo_valid & OBD_MD_FLID))
3044                 RETURN(0);
3045
3046         if (!fid_is_sane(&body->mbo_fid1)) {
3047                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
3048                 RETURN(-EINVAL);
3049         }
3050
3051         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
3052         if (!IS_ERR(obj)) {
3053                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
3054                         mdt_object_put(env, obj);
3055                         rc = -ENOENT;
3056                 } else {
3057                         info->mti_object = obj;
3058                         rc = 0;
3059                 }
3060         } else
3061                 rc = PTR_ERR(obj);
3062
3063         RETURN(rc);
3064 }
3065
3066 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
3067 {
3068         struct req_capsule *pill = info->mti_pill;
3069         int rc;
3070         ENTRY;
3071
3072         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
3073                 rc = mdt_body_unpack(info, flags);
3074         else
3075                 rc = 0;
3076
3077         if (rc == 0 && (flags & HABEO_REFERO)) {
3078                 /* Pack reply. */
3079                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
3080                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
3081                                              DEF_REP_MD_SIZE);
3082                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
3083                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
3084                                              RCL_SERVER, 0);
3085
3086                 /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
3087                  * by default. If the target object has more ACL entries, then
3088                  * enlarge the buffer when necessary. */
3089                 if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
3090                         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
3091                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
3092
3093                 rc = req_capsule_server_pack(pill);
3094         }
3095         RETURN(rc);
3096 }
3097
3098 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
3099 {
3100         lh->mlh_type = MDT_NUL_LOCK;
3101         lh->mlh_reg_lh.cookie = 0ull;
3102         lh->mlh_reg_mode = LCK_MINMODE;
3103         lh->mlh_pdo_lh.cookie = 0ull;
3104         lh->mlh_pdo_mode = LCK_MINMODE;
3105         lh->mlh_rreg_lh.cookie = 0ull;
3106         lh->mlh_rreg_mode = LCK_MINMODE;
3107 }
3108
3109 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
3110 {
3111         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
3112         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
3113 }
3114
3115 /*
3116  * Initialize fields of struct mdt_thread_info. Other fields are left in
3117  * uninitialized state, because it's too expensive to zero out whole
3118  * mdt_thread_info (> 1K) on each request arrival.
3119  */
3120 void mdt_thread_info_init(struct ptlrpc_request *req,
3121                           struct mdt_thread_info *info)
3122 {
3123         int i;
3124
3125         info->mti_pill = &req->rq_pill;
3126
3127         /* lock handle */
3128         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3129                 mdt_lock_handle_init(&info->mti_lh[i]);
3130
3131         /* mdt device: it can be NULL while CONNECT */
3132         if (req->rq_export) {
3133                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
3134                 info->mti_exp = req->rq_export;
3135         } else
3136                 info->mti_mdt = NULL;
3137         info->mti_env = req->rq_svc_thread->t_env;
3138         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
3139
3140         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
3141         info->mti_big_buf = LU_BUF_NULL;
3142         info->mti_body = NULL;
3143         info->mti_object = NULL;
3144         info->mti_dlm_req = NULL;
3145         info->mti_has_trans = 0;
3146         info->mti_cross_ref = 0;
3147         info->mti_opdata = 0;
3148         info->mti_big_lmm_used = 0;
3149         info->mti_big_acl_used = 0;
3150
3151         info->mti_spec.no_create = 0;
3152         info->mti_spec.sp_rm_entry = 0;
3153         info->mti_spec.sp_permitted = 0;
3154         info->mti_spec.sp_migrate_close = 0;
3155
3156         info->mti_spec.u.sp_ea.eadata = NULL;
3157         info->mti_spec.u.sp_ea.eadatalen = 0;
3158 }
3159
3160 void mdt_thread_info_fini(struct mdt_thread_info *info)
3161 {
3162         int i;
3163
3164         if (info->mti_object != NULL) {
3165                 mdt_object_put(info->mti_env, info->mti_object);
3166                 info->mti_object = NULL;
3167         }
3168
3169         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3170                 mdt_lock_handle_fini(&info->mti_lh[i]);
3171         info->mti_env = NULL;
3172         info->mti_pill = NULL;
3173         info->mti_exp = NULL;
3174
3175         if (unlikely(info->mti_big_buf.lb_buf != NULL))
3176                 lu_buf_free(&info->mti_big_buf);
3177 }
3178
3179 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
3180 {
3181         struct mdt_thread_info  *mti;
3182
3183         mti = mdt_th_info(tsi->tsi_env);
3184         LASSERT(mti != NULL);
3185
3186         mdt_thread_info_init(tgt_ses_req(tsi), mti);
3187         if (tsi->tsi_corpus != NULL) {
3188                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
3189                 lu_object_get(tsi->tsi_corpus);
3190         }
3191         mti->mti_body = tsi->tsi_mdt_body;
3192         mti->mti_dlm_req = tsi->tsi_dlm_req;
3193
3194         return mti;
3195 }
3196
3197 static int mdt_tgt_connect(struct tgt_session_info *tsi)
3198 {
3199         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
3200             cfs_fail_val ==
3201             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
3202                 set_current_state(TASK_UNINTERRUPTIBLE);
3203                 schedule_timeout(msecs_to_jiffies(3 * MSEC_PER_SEC));
3204         }
3205
3206         return tgt_connect(tsi);
3207 }
3208
3209 enum mdt_it_code {
3210         MDT_IT_OPEN,
3211         MDT_IT_OCREAT,
3212         MDT_IT_CREATE,
3213         MDT_IT_GETATTR,
3214         MDT_IT_READDIR,
3215         MDT_IT_LOOKUP,
3216         MDT_IT_UNLINK,
3217         MDT_IT_TRUNC,
3218         MDT_IT_GETXATTR,
3219         MDT_IT_LAYOUT,
3220         MDT_IT_QUOTA,
3221         MDT_IT_NR
3222 };
3223
3224 static int mdt_intent_getattr(enum mdt_it_code opcode,
3225                               struct mdt_thread_info *info,
3226                               struct ldlm_lock **,
3227                               __u64);
3228
3229 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3230                                 struct mdt_thread_info *info,
3231                                 struct ldlm_lock **lockp,
3232                                 __u64 flags);
3233
3234 static int mdt_intent_layout(enum mdt_it_code opcode,
3235                              struct mdt_thread_info *info,
3236                              struct ldlm_lock **,
3237                              __u64);
3238 static int mdt_intent_reint(enum mdt_it_code opcode,
3239                             struct mdt_thread_info *info,
3240                             struct ldlm_lock **,
3241                             __u64);
3242
3243 static struct mdt_it_flavor {
3244         const struct req_format *it_fmt;
3245         __u32                    it_flags;
3246         int                    (*it_act)(enum mdt_it_code ,
3247                                          struct mdt_thread_info *,
3248                                          struct ldlm_lock **,
3249                                          __u64);
3250         long                     it_reint;
3251 } mdt_it_flavor[] = {
3252         [MDT_IT_OPEN]     = {
3253                 .it_fmt   = &RQF_LDLM_INTENT,
3254                 /*.it_flags = HABEO_REFERO,*/
3255                 .it_flags = 0,
3256                 .it_act   = mdt_intent_reint,
3257                 .it_reint = REINT_OPEN
3258         },
3259         [MDT_IT_OCREAT]   = {
3260                 .it_fmt   = &RQF_LDLM_INTENT,
3261                 /*
3262                  * OCREAT is not a MUTABOR request as if the file
3263                  * already exists.
3264                  * We do the extra check of OBD_CONNECT_RDONLY in
3265                  * mdt_reint_open() when we really need to create
3266                  * the object.
3267                  */
3268                 .it_flags = 0,
3269                 .it_act   = mdt_intent_reint,
3270                 .it_reint = REINT_OPEN
3271         },
3272         [MDT_IT_CREATE]   = {
3273                 .it_fmt   = &RQF_LDLM_INTENT,
3274                 .it_flags = MUTABOR,
3275                 .it_act   = mdt_intent_reint,
3276                 .it_reint = REINT_CREATE
3277         },
3278         [MDT_IT_GETATTR]  = {
3279                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3280                 .it_flags = HABEO_REFERO,
3281                 .it_act   = mdt_intent_getattr
3282         },
3283         [MDT_IT_READDIR]  = {
3284                 .it_fmt   = NULL,
3285                 .it_flags = 0,
3286                 .it_act   = NULL
3287         },
3288         [MDT_IT_LOOKUP]   = {
3289                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3290                 .it_flags = HABEO_REFERO,
3291                 .it_act   = mdt_intent_getattr
3292         },
3293         [MDT_IT_UNLINK]   = {
3294                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
3295                 .it_flags = MUTABOR,
3296                 .it_act   = NULL,
3297                 .it_reint = REINT_UNLINK
3298         },
3299         [MDT_IT_TRUNC]    = {
3300                 .it_fmt   = NULL,
3301                 .it_flags = MUTABOR,
3302                 .it_act   = NULL
3303         },
3304         [MDT_IT_GETXATTR] = {
3305                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
3306                 .it_flags = HABEO_CORPUS,
3307                 .it_act   = mdt_intent_getxattr
3308         },
3309         [MDT_IT_LAYOUT] = {
3310                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
3311                 .it_flags = 0,
3312                 .it_act   = mdt_intent_layout
3313         }
3314 };
3315
3316 static int
3317 mdt_intent_lock_replace(struct mdt_thread_info *info,
3318                         struct ldlm_lock **lockp,
3319                         struct mdt_lock_handle *lh,
3320                         __u64 flags, int result)
3321 {
3322         struct ptlrpc_request  *req = mdt_info_req(info);
3323         struct ldlm_lock       *lock = *lockp;
3324         struct ldlm_lock       *new_lock;
3325
3326         /* If possible resent found a lock, @lh is set to its handle */
3327         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3328
3329         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3330                 lh->mlh_reg_lh.cookie = 0;
3331                 RETURN(0);
3332         }
3333
3334         if (new_lock == NULL && (flags & LDLM_FL_RESENT)) {
3335                 /* Lock is pinned by ldlm_handle_enqueue0() as it is
3336                  * a resend case, however, it could be already destroyed
3337                  * due to client eviction or a raced cancel RPC. */
3338                 LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx\n",
3339                                   lh->mlh_reg_lh.cookie);
3340                 lh->mlh_reg_lh.cookie = 0;
3341                 RETURN(-ESTALE);
3342         }
3343
3344         LASSERTF(new_lock != NULL,
3345                  "lockh %#llx flags %#llx : rc = %d\n",
3346                  lh->mlh_reg_lh.cookie, flags, result);
3347
3348         /*
3349          * If we've already given this lock to a client once, then we should
3350          * have no readers or writers.  Otherwise, we should have one reader
3351          * _or_ writer ref (which will be zeroed below) before returning the
3352          * lock to a client.
3353          */
3354         if (new_lock->l_export == req->rq_export) {
3355                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3356         } else {
3357                 LASSERT(new_lock->l_export == NULL);
3358                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3359         }
3360
3361         *lockp = new_lock;
3362
3363         if (new_lock->l_export == req->rq_export) {
3364                 /*
3365                  * Already gave this to the client, which means that we
3366                  * reconstructed a reply.
3367                  */
3368                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3369                         MSG_RESENT);
3370
3371                 LDLM_LOCK_RELEASE(new_lock);
3372                 lh->mlh_reg_lh.cookie = 0;
3373                 RETURN(ELDLM_LOCK_REPLACED);
3374         }
3375
3376         /*
3377          * Fixup the lock to be given to the client.
3378          */
3379         lock_res_and_lock(new_lock);
3380         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3381          * possible blocking AST. */
3382         while (new_lock->l_readers > 0) {
3383                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3384                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3385                 new_lock->l_readers--;
3386         }
3387         while (new_lock->l_writers > 0) {
3388                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3389                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3390                 new_lock->l_writers--;
3391         }
3392
3393         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3394         new_lock->l_blocking_ast = lock->l_blocking_ast;
3395         new_lock->l_completion_ast = lock->l_completion_ast;
3396         new_lock->l_remote_handle = lock->l_remote_handle;
3397         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3398
3399         unlock_res_and_lock(new_lock);
3400
3401         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3402                      &new_lock->l_remote_handle,
3403                      &new_lock->l_exp_hash);
3404
3405         LDLM_LOCK_RELEASE(new_lock);
3406         lh->mlh_reg_lh.cookie = 0;
3407
3408         RETURN(ELDLM_LOCK_REPLACED);
3409 }
3410
3411 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3412                                     struct ldlm_lock *new_lock,
3413                                     struct mdt_lock_handle *lh,
3414                                     __u64 flags)
3415 {
3416         struct ptlrpc_request  *req = mdt_info_req(info);
3417         struct ldlm_request    *dlmreq;
3418
3419         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3420                 return;
3421
3422         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3423
3424         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3425          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3426          * initialized. */
3427         if (flags & LDLM_FL_RESENT) {
3428                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3429                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3430
3431                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3432                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie %#llx",
3433                           lh->mlh_reg_lh.cookie);
3434                 return;
3435         }
3436
3437         /*
3438          * If the xid matches, then we know this is a resent request, and allow
3439          * it. (It's probably an OPEN, for which we don't send a lock.
3440          */
3441         if (req_can_reconstruct(req, NULL))
3442                 return;
3443
3444         /*
3445          * This remote handle isn't enqueued, so we never received or processed
3446          * this request.  Clear MSG_RESENT, because it can be handled like any
3447          * normal request now.
3448          */
3449         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3450
3451         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle %#llx",
3452                   dlmreq->lock_handle[0].cookie);
3453 }
3454
3455 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3456                                 struct mdt_thread_info *info,
3457                                 struct ldlm_lock **lockp,
3458                                 __u64 flags)
3459 {
3460         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3461         struct ldlm_reply      *ldlm_rep = NULL;
3462         int rc;
3463         ENTRY;
3464
3465         /*
3466          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3467          * (for the resend case) or a new lock. Below we will use it to
3468          * replace the original lock.
3469          */
3470         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3471         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3472                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3473                 rc = mdt_object_lock(info, info->mti_object, lhc,
3474                                      MDS_INODELOCK_XATTR);
3475                 if (rc)
3476                         return rc;
3477         }
3478
3479         rc = mdt_getxattr(info);
3480
3481         if (mdt_info_req(info)->rq_repmsg != NULL)
3482                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3483
3484         if (ldlm_rep == NULL ||
3485             OBD_FAIL_CHECK(OBD_FAIL_MDS_XATTR_REP)) {
3486                 mdt_object_unlock(info,  info->mti_object, lhc, 1);
3487                 RETURN(err_serious(-EFAULT));
3488         }
3489
3490         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3491
3492         /* This is left for interop instead of adding a new interop flag.
3493          * LU-7433 */
3494 #if LUSTRE_VERSION_CODE > OBD_OCD_VERSION(3, 0, 0, 0)
3495         if (ldlm_rep->lock_policy_res2) {
3496                 mdt_object_unlock(info, info->mti_object, lhc, 1);
3497                 RETURN(ELDLM_LOCK_ABORTED);
3498         }
3499 #endif
3500
3501         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3502         RETURN(rc);
3503 }
3504
3505 static int mdt_intent_getattr(enum mdt_it_code opcode,
3506                               struct mdt_thread_info *info,
3507                               struct ldlm_lock **lockp,
3508                               __u64 flags)
3509 {
3510         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3511         __u64                   child_bits;
3512         struct ldlm_reply      *ldlm_rep;
3513         struct mdt_body        *reqbody;
3514         struct mdt_body        *repbody;
3515         int                     rc, rc2;
3516         ENTRY;
3517
3518         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3519         LASSERT(reqbody);
3520
3521         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3522         LASSERT(repbody);
3523
3524         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3525         repbody->mbo_eadatasize = 0;
3526         repbody->mbo_aclsize = 0;
3527
3528         switch (opcode) {
3529         case MDT_IT_LOOKUP:
3530                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3531                 break;
3532         case MDT_IT_GETATTR:
3533                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3534                              MDS_INODELOCK_PERM;
3535                 break;
3536         default:
3537                 CERROR("Unsupported intent (%d)\n", opcode);
3538                 GOTO(out_shrink, rc = -EINVAL);
3539         }
3540
3541         rc = mdt_init_ucred_intent_getattr(info, reqbody);
3542         if (rc)
3543                 GOTO(out_shrink, rc);
3544
3545         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3546         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3547
3548         /* Get lock from request for possible resent case. */
3549         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3550
3551         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3552         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3553
3554         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3555                 ldlm_rep->lock_policy_res2 = 0;
3556         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3557             ldlm_rep->lock_policy_res2) {
3558                 lhc->mlh_reg_lh.cookie = 0ull;
3559                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3560         }
3561
3562         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3563         EXIT;
3564 out_ucred:
3565         mdt_exit_ucred(info);
3566 out_shrink:
3567         mdt_client_compatibility(info);
3568         rc2 = mdt_fix_reply(info);
3569         if (rc == 0)
3570                 rc = rc2;
3571         return rc;
3572 }
3573
3574 static int mdt_intent_layout(enum mdt_it_code opcode,
3575                              struct mdt_thread_info *info,
3576                              struct ldlm_lock **lockp,
3577                              __u64 flags)
3578 {
3579         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3580         struct layout_intent *layout;
3581         struct lu_fid *fid;
3582         struct mdt_object *obj = NULL;
3583         bool layout_change = false;
3584         int layout_size = 0;
3585         int rc = 0;
3586         ENTRY;
3587
3588         if (opcode != MDT_IT_LAYOUT) {
3589                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3590                         opcode);
3591                 RETURN(-EINVAL);
3592         }
3593
3594         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3595         if (layout == NULL)
3596                 RETURN(-EPROTO);
3597
3598         switch (layout->li_opc) {
3599         case LAYOUT_INTENT_TRUNC:
3600         case LAYOUT_INTENT_WRITE:
3601                 layout_change = true;
3602                 break;
3603         case LAYOUT_INTENT_ACCESS:
3604                 break;
3605         case LAYOUT_INTENT_READ:
3606         case LAYOUT_INTENT_GLIMPSE:
3607         case LAYOUT_INTENT_RELEASE:
3608         case LAYOUT_INTENT_RESTORE:
3609                 CERROR("%s: Unsupported layout intent opc %d\n",
3610                        mdt_obd_name(info->mti_mdt), layout->li_opc);
3611                 rc = -ENOTSUPP;
3612                 break;
3613         default:
3614                 CERROR("%s: Unknown layout intent opc %d\n",
3615                        mdt_obd_name(info->mti_mdt), layout->li_opc);
3616                 rc = -EINVAL;
3617                 break;
3618         }
3619         if (rc < 0)
3620                 RETURN(rc);
3621
3622         fid = &info->mti_tmp_fid2;
3623         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3624
3625         /* Get lock from request for possible resent case. */
3626         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3627
3628         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3629         if (IS_ERR(obj))
3630                 GOTO(out, rc = PTR_ERR(obj));
3631
3632         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3633                 layout_size = mdt_attr_get_eabuf_size(info, obj);
3634                 if (layout_size < 0)
3635                         GOTO(out_obj, rc = layout_size);
3636
3637                 if (layout_size > info->mti_mdt->mdt_max_mdsize)
3638                         info->mti_mdt->mdt_max_mdsize = layout_size;
3639         }
3640
3641         /*
3642          * set reply buffer size, so that ldlm_handle_enqueue0()->
3643          * ldlm_lvbo_fill() will fill the reply buffer with lovea.
3644          */
3645         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3646         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3647                              layout_size);
3648         rc = req_capsule_server_pack(info->mti_pill);
3649         if (rc)
3650                 GOTO(out_obj, rc);
3651
3652
3653         if (layout_change) {
3654                 struct lu_buf *buf = &info->mti_buf;
3655
3656                 /**
3657                  * mdt_layout_change is a reint operation, when the request
3658                  * is resent, layout write shouldn't reprocess it again.
3659                  */
3660                 rc = mdt_check_resent(info, mdt_reconstruct_generic, lhc);
3661                 if (rc)
3662                         GOTO(out_obj, rc = rc < 0 ? rc : 0);
3663
3664                 /**
3665                  * There is another resent case: the client's job has been
3666                  * done by another client, referring lod_declare_layout_change
3667                  * -EALREADY case, and it became a operation w/o transaction,
3668                  * so we should not do the layout change, otherwise
3669                  * mdt_layout_change() will try to cancel the granted server
3670                  * CR lock whose remote counterpart is still in hold on the
3671                  * client, and a deadlock ensues.
3672                  */
3673                 rc = mdt_check_resent_lock(info, obj, lhc);
3674                 if (rc <= 0)
3675                         GOTO(out_obj, rc);
3676
3677                 buf->lb_buf = NULL;
3678                 buf->lb_len = 0;
3679                 if (unlikely(req_is_replay(mdt_info_req(info)))) {
3680                         buf->lb_buf = req_capsule_client_get(info->mti_pill,
3681                                         &RMF_EADATA);
3682                         buf->lb_len = req_capsule_get_size(info->mti_pill,
3683                                         &RMF_EADATA, RCL_CLIENT);
3684                         /*
3685                          * If it's a replay of layout write intent RPC, the
3686                          * client has saved the extended lovea when
3687                          * it get reply then.
3688                          */
3689                         if (buf->lb_len > 0)
3690                                 mdt_fix_lov_magic(info, buf->lb_buf);
3691                 }
3692
3693                 /*
3694                  * Instantiate some layout components, if @buf contains
3695                  * lovea, then it's a replay of the layout intent write
3696                  * RPC.
3697                  */
3698                 rc = mdt_layout_change(info, obj, layout, buf);
3699                 if (rc)
3700                         GOTO(out_obj, rc);
3701         }
3702 out_obj:
3703         mdt_object_put(info->mti_env, obj);
3704
3705         if (rc == 0 && lustre_handle_is_used(&lhc->mlh_reg_lh))
3706                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3707
3708 out:
3709         lhc->mlh_reg_lh.cookie = 0;
3710
3711         return rc;
3712 }
3713
3714 static int mdt_intent_reint(enum mdt_it_code opcode,
3715                             struct mdt_thread_info *info,
3716                             struct ldlm_lock **lockp,
3717                             __u64 flags)
3718 {
3719         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3720         struct ldlm_reply      *rep = NULL;
3721         long                    opc;
3722         int                     rc;
3723
3724         static const struct req_format *intent_fmts[REINT_MAX] = {
3725                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3726                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3727         };
3728
3729         ENTRY;
3730
3731         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3732         if (opc < 0)
3733                 RETURN(opc);
3734
3735         if (mdt_it_flavor[opcode].it_reint != opc) {
3736                 CERROR("Reint code %ld doesn't match intent: %d\n",
3737                        opc, opcode);
3738                 RETURN(err_serious(-EPROTO));
3739         }
3740
3741         /* Get lock from request for possible resent case. */
3742         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3743
3744         rc = mdt_reint_internal(info, lhc, opc);
3745
3746         /* Check whether the reply has been packed successfully. */
3747         if (mdt_info_req(info)->rq_repmsg != NULL)
3748                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3749         if (rep == NULL)
3750                 RETURN(err_serious(-EFAULT));
3751
3752         /* MDC expects this in any case */
3753         if (rc != 0)
3754                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3755
3756         /* the open lock or the lock for cross-ref object should be
3757          * returned to the client */
3758         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3759             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3760                 rep->lock_policy_res2 = 0;
3761                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3762                 RETURN(rc);
3763         }
3764
3765         rep->lock_policy_res2 = clear_serious(rc);
3766
3767         if (rep->lock_policy_res2 == -ENOENT &&
3768             mdt_get_disposition(rep, DISP_LOOKUP_NEG) &&
3769             !mdt_get_disposition(rep, DISP_OPEN_CREATE))
3770                 rep->lock_policy_res2 = 0;
3771
3772         lhc->mlh_reg_lh.cookie = 0ull;
3773         if (rc == -ENOTCONN || rc == -ENODEV ||
3774             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3775                 /*
3776                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3777                  * will be returned by rq_status, and client at ptlrpc layer
3778                  * will detect this, then disconnect, reconnect the import
3779                  * immediately, instead of impacting the following the rpc.
3780                  */
3781                 RETURN(rc);
3782         }
3783         /*
3784          * For other cases, the error will be returned by intent, and client
3785          * will retrieve the result from intent.
3786          */
3787         RETURN(ELDLM_LOCK_ABORTED);
3788 }
3789
3790 static int mdt_intent_code(enum ldlm_intent_flags itcode)
3791 {
3792         int rc;
3793
3794         switch (itcode) {
3795         case IT_OPEN:
3796                 rc = MDT_IT_OPEN;
3797                 break;
3798         case IT_OPEN|IT_CREAT:
3799                 rc = MDT_IT_OCREAT;
3800                 break;
3801         case IT_CREAT:
3802                 rc = MDT_IT_CREATE;
3803                 break;
3804         case IT_READDIR:
3805                 rc = MDT_IT_READDIR;
3806                 break;
3807         case IT_GETATTR:
3808                 rc = MDT_IT_GETATTR;
3809                 break;
3810         case IT_LOOKUP:
3811                 rc = MDT_IT_LOOKUP;
3812                 break;
3813         case IT_UNLINK:
3814                 rc = MDT_IT_UNLINK;
3815                 break;
3816         case IT_TRUNC:
3817                 rc = MDT_IT_TRUNC;
3818                 break;
3819         case IT_GETXATTR:
3820                 rc = MDT_IT_GETXATTR;
3821                 break;
3822         case IT_LAYOUT:
3823                 rc = MDT_IT_LAYOUT;
3824                 break;
3825         case IT_QUOTA_DQACQ:
3826         case IT_QUOTA_CONN:
3827                 rc = MDT_IT_QUOTA;
3828                 break;
3829         default:
3830                 CERROR("Unknown intent opcode: 0x%08x\n", itcode);
3831                 rc = -EINVAL;
3832                 break;
3833         }
3834         return rc;
3835 }
3836
3837 static int mdt_intent_opc(enum ldlm_intent_flags itopc,
3838                           struct mdt_thread_info *info,
3839                           struct ldlm_lock **lockp, __u64 flags)
3840 {
3841         struct req_capsule      *pill = info->mti_pill;
3842         struct ptlrpc_request   *req = mdt_info_req(info);
3843         struct mdt_it_flavor    *flv;
3844         int opc;
3845         int rc;
3846         ENTRY;
3847
3848         opc = mdt_intent_code(itopc);
3849         if (opc < 0)
3850                 RETURN(-EINVAL);
3851
3852         if (opc == MDT_IT_QUOTA) {
3853                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3854
3855                 if (qmt == NULL)
3856                         RETURN(-EOPNOTSUPP);
3857
3858                 if (mdt_rdonly(req->rq_export))
3859                         RETURN(-EROFS);
3860
3861                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3862                 /* pass the request to quota master */
3863                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3864                                                  mdt_info_req(info), lockp,
3865                                                  flags);
3866                 RETURN(rc);
3867         }
3868
3869         flv = &mdt_it_flavor[opc];
3870         if (flv->it_fmt != NULL)
3871                 req_capsule_extend(pill, flv->it_fmt);
3872
3873         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3874         if (rc < 0)
3875                 RETURN(rc);
3876
3877         if (flv->it_flags & MUTABOR && mdt_rdonly(req->rq_export))
3878                 RETURN(-EROFS);
3879
3880         if (flv->it_act != NULL) {
3881                 struct ldlm_reply *rep;
3882
3883                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
3884
3885                 /* execute policy */
3886                 rc = flv->it_act(opc, info, lockp, flags);
3887
3888                 /* Check whether the reply has been packed successfully. */
3889                 if (req->rq_repmsg != NULL) {
3890                         rep = req_capsule_server_get(info->mti_pill,
3891                                                      &RMF_DLM_REP);
3892                         rep->lock_policy_res2 =
3893                                 ptlrpc_status_hton(rep->lock_policy_res2);
3894                 }
3895         }
3896
3897         RETURN(rc);
3898 }
3899
3900 static int mdt_intent_policy(struct ldlm_namespace *ns,
3901                              struct ldlm_lock **lockp, void *req_cookie,
3902                              enum ldlm_mode mode, __u64 flags, void *data)
3903 {
3904         struct tgt_session_info *tsi;
3905         struct mdt_thread_info  *info;
3906         struct ptlrpc_request   *req  =  req_cookie;
3907         struct ldlm_intent      *it;
3908         struct req_capsule      *pill;
3909         int rc;
3910
3911         ENTRY;
3912
3913         LASSERT(req != NULL);
3914
3915         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3916
3917         info = tsi2mdt_info(tsi);
3918         LASSERT(info != NULL);
3919         pill = info->mti_pill;
3920         LASSERT(pill->rc_req == req);
3921
3922         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3923                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3924                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3925                 if (it != NULL) {
3926                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3927                         if (rc == 0)
3928                                 rc = ELDLM_OK;
3929
3930                         /* Lock without inodebits makes no sense and will oops
3931                          * later in ldlm. Let's check it now to see if we have
3932                          * ibits corrupted somewhere in mdt_intent_opc().
3933                          * The case for client miss to set ibits has been
3934                          * processed by others. */
3935                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3936                                         lr_type == LDLM_IBITS,
3937                                      info->mti_dlm_req->lock_desc.\
3938                                         l_policy_data.l_inodebits.bits != 0));
3939                 } else
3940                         rc = err_serious(-EFAULT);
3941         } else {
3942                 /* No intent was provided */
3943                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3944                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3945                 rc = req_capsule_server_pack(pill);
3946                 if (rc)
3947                         rc = err_serious(rc);
3948         }
3949         mdt_thread_info_fini(info);
3950         RETURN(rc);
3951 }
3952
3953 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3954 {
3955         struct seq_server_site  *ss = mdt_seq_site(mdt);
3956
3957         if (ss->ss_node_id == 0)
3958                 return;
3959
3960         if (ss->ss_client_seq != NULL) {
3961                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3962                 ss->ss_client_seq->lcs_exp = NULL;
3963         }
3964
3965         if (ss->ss_server_fld != NULL) {
3966                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3967                 ss->ss_server_fld->lsf_control_exp = NULL;
3968         }
3969 }
3970
3971 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3972 {
3973         struct seq_server_site *ss = mdt_seq_site(mdt);
3974
3975         if (ss == NULL)
3976                 return;
3977
3978         if (ss->ss_server_seq != NULL)
3979                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3980 }
3981
3982 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3983 {
3984         mdt_seq_fini_cli(mdt);
3985         mdt_deregister_seq_exp(mdt);
3986
3987         return seq_site_fini(env, mdt_seq_site(mdt));
3988 }
3989
3990 /**
3991  * It will retrieve its FLDB entries from MDT0, and it only happens
3992  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3993  * and it needs to refresh FLDB from the MDT0.
3994  **/
3995 static int mdt_register_lwp_callback(void *data)
3996 {
3997         struct lu_env           env;
3998         struct mdt_device       *mdt = data;
3999         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
4000         int                     rc;
4001         ENTRY;
4002
4003         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
4004
4005         rc = lu_env_init(&env, LCT_MD_THREAD);
4006         if (rc < 0) {
4007                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
4008                 RETURN(rc);
4009         }
4010
4011         /* Allocate new sequence now to avoid creating local transaction
4012          * in the normal transaction process */
4013         rc = seq_server_check_and_alloc_super(&env,
4014                                               mdt_seq_site(mdt)->ss_server_seq);
4015         if (rc < 0)
4016                 GOTO(out, rc);
4017
4018         if (fld->lsf_new) {
4019                 rc = fld_update_from_controller(&env, fld);
4020                 if (rc != 0) {
4021                         CERROR("%s: cannot update controller: rc = %d\n",
4022                                mdt_obd_name(mdt), rc);
4023                         GOTO(out, rc);
4024                 }
4025         }
4026 out:
4027         lu_env_fini(&env);
4028         RETURN(rc);
4029 }
4030
4031 static int mdt_register_seq_exp(struct mdt_device *mdt)
4032 {
4033         struct seq_server_site  *ss = mdt_seq_site(mdt);
4034         char                    *lwp_name = NULL;
4035         int                     rc;
4036
4037         if (ss->ss_node_id == 0)
4038                 return 0;
4039
4040         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
4041         if (lwp_name == NULL)
4042                 GOTO(out_free, rc = -ENOMEM);
4043
4044         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
4045         if (rc != 0)
4046                 GOTO(out_free, rc);
4047
4048         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
4049                                       NULL, NULL);
4050         if (rc != 0)
4051                 GOTO(out_free, rc);
4052
4053         rc = lustre_register_lwp_item(lwp_name,
4054                                       &ss->ss_server_fld->lsf_control_exp,
4055                                       mdt_register_lwp_callback, mdt);
4056         if (rc != 0) {
4057                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
4058                 ss->ss_client_seq->lcs_exp = NULL;
4059                 GOTO(out_free, rc);
4060         }
4061 out_free:
4062         if (lwp_name != NULL)
4063                 OBD_FREE(lwp_name, MAX_OBD_NAME);
4064
4065         return rc;
4066 }
4067
4068 /*
4069  * Init client sequence manager which is used by local MDS to talk to sequence
4070  * controller on remote node.
4071  */
4072 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
4073 {
4074         struct seq_server_site  *ss = mdt_seq_site(mdt);
4075         int                     rc;
4076         char                    *prefix;
4077         ENTRY;
4078
4079         /* check if this is adding the first MDC and controller is not yet
4080          * initialized. */
4081         OBD_ALLOC_PTR(ss->ss_client_seq);
4082         if (ss->ss_client_seq == NULL)
4083                 RETURN(-ENOMEM);
4084
4085         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
4086         if (prefix == NULL) {
4087                 OBD_FREE_PTR(ss->ss_client_seq);
4088                 ss->ss_client_seq = NULL;
4089                 RETURN(-ENOMEM);
4090         }
4091
4092         /* Note: seq_client_fini will be called in seq_site_fini */
4093         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
4094         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
4095                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
4096                                                             NULL);
4097         OBD_FREE(prefix, MAX_OBD_NAME + 5);
4098         if (rc != 0) {
4099                 OBD_FREE_PTR(ss->ss_client_seq);
4100                 ss->ss_client_seq = NULL;
4101                 RETURN(rc);
4102         }
4103
4104         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
4105
4106         RETURN(rc);
4107 }
4108
4109 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
4110 {
4111         struct seq_server_site  *ss;
4112         int                     rc;
4113         ENTRY;
4114
4115         ss = mdt_seq_site(mdt);
4116         /* init sequence controller server(MDT0) */
4117         if (ss->ss_node_id == 0) {
4118                 OBD_ALLOC_PTR(ss->ss_control_seq);
4119                 if (ss->ss_control_seq == NULL)
4120                         RETURN(-ENOMEM);
4121
4122                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
4123                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
4124                                      ss);
4125                 if (rc)
4126                         GOTO(out_seq_fini, rc);
4127         }
4128
4129         /* Init normal sequence server */
4130         OBD_ALLOC_PTR(ss->ss_server_seq);
4131         if (ss->ss_server_seq == NULL)
4132                 GOTO(out_seq_fini, rc = -ENOMEM);
4133
4134         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
4135                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
4136         if (rc)
4137                 GOTO(out_seq_fini, rc);
4138
4139         /* init seq client for seq server to talk to seq controller(MDT0) */
4140         rc = mdt_seq_init_cli(env, mdt);
4141         if (rc != 0)
4142                 GOTO(out_seq_fini, rc);
4143
4144         if (ss->ss_node_id != 0)
4145                 /* register controller export through lwp */
4146                 rc = mdt_register_seq_exp(mdt);
4147
4148         EXIT;
4149 out_seq_fini:
4150         if (rc)
4151                 mdt_seq_fini(env, mdt);
4152
4153         return rc;
4154 }
4155
4156 /*
4157  * FLD wrappers
4158  */
4159 static int mdt_fld_fini(const struct lu_env *env,
4160                         struct mdt_device *m)
4161 {
4162         struct seq_server_site *ss = mdt_seq_site(m);
4163         ENTRY;
4164
4165         if (ss && ss->ss_server_fld) {
4166                 fld_server_fini(env, ss->ss_server_fld);
4167                 OBD_FREE_PTR(ss->ss_server_fld);
4168                 ss->ss_server_fld = NULL;
4169         }
4170
4171         RETURN(0);
4172 }
4173
4174 static int mdt_fld_init(const struct lu_env *env,
4175                         const char *uuid,
4176                         struct mdt_device *m)
4177 {
4178         struct seq_server_site *ss;
4179         int rc;
4180         ENTRY;
4181
4182         ss = mdt_seq_site(m);
4183
4184         OBD_ALLOC_PTR(ss->ss_server_fld);
4185         if (ss->ss_server_fld == NULL)
4186                 RETURN(rc = -ENOMEM);
4187
4188         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
4189                              LU_SEQ_RANGE_MDT);
4190         if (rc) {
4191                 OBD_FREE_PTR(ss->ss_server_fld);
4192                 ss->ss_server_fld = NULL;
4193                 RETURN(rc);
4194         }
4195
4196         RETURN(0);
4197 }
4198
4199 static void mdt_stack_pre_fini(const struct lu_env *env,
4200                            struct mdt_device *m, struct lu_device *top)
4201 {
4202         struct lustre_cfg_bufs  *bufs;
4203         struct lustre_cfg       *lcfg;
4204         struct mdt_thread_info  *info;
4205         ENTRY;
4206
4207         LASSERT(top);
4208
4209         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4210         LASSERT(info != NULL);
4211
4212         bufs = &info->mti_u.bufs;
4213
4214         LASSERT(m->mdt_child_exp);
4215         LASSERT(m->mdt_child_exp->exp_obd);
4216
4217         /* process cleanup, pass mdt obd name to get obd umount flags */
4218         /* XXX: this is needed because all layers are referenced by
4219          * objects (some of them are pinned by osd, for example *
4220          * the proper solution should be a model where object used
4221          * by osd only doesn't have mdt/mdd slices -bzzz */
4222         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4223         lustre_cfg_bufs_set_string(bufs, 1, NULL);
4224         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
4225         if (lcfg == NULL)
4226                 RETURN_EXIT;
4227
4228         top->ld_ops->ldo_process_config(env, top, lcfg);
4229         lustre_cfg_free(lcfg);
4230         EXIT;
4231 }
4232
4233 static void mdt_stack_fini(const struct lu_env *env,
4234                            struct mdt_device *m, struct lu_device *top)
4235 {
4236         struct obd_device       *obd = mdt2obd_dev(m);
4237         struct lustre_cfg_bufs  *bufs;
4238         struct lustre_cfg       *lcfg;
4239         struct mdt_thread_info  *info;
4240         char                     flags[3] = "";
4241         ENTRY;
4242
4243         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4244         LASSERT(info != NULL);
4245
4246         lu_dev_del_linkage(top->ld_site, top);
4247
4248         lu_site_purge(env, top->ld_site, -1);
4249
4250         bufs = &info->mti_u.bufs;
4251         /* process cleanup, pass mdt obd name to get obd umount flags */
4252         /* another purpose is to let all layers to release their objects */
4253         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4254         if (obd->obd_force)
4255                 strcat(flags, "F");
4256         if (obd->obd_fail)
4257                 strcat(flags, "A");
4258         lustre_cfg_bufs_set_string(bufs, 1, flags);
4259         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
4260         if (lcfg == NULL)
4261                 RETURN_EXIT;
4262
4263         LASSERT(top);
4264         top->ld_ops->ldo_process_config(env, top, lcfg);
4265         lustre_cfg_free(lcfg);
4266
4267         lu_site_purge(env, top->ld_site, -1);
4268
4269         m->mdt_child = NULL;
4270         m->mdt_bottom = NULL;
4271
4272         obd_disconnect(m->mdt_child_exp);
4273         m->mdt_child_exp = NULL;
4274
4275         obd_disconnect(m->mdt_bottom_exp);
4276         m->mdt_child_exp = NULL;
4277 }
4278
4279 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
4280                                const char *next, struct obd_export **exp)
4281 {
4282         struct obd_connect_data *data = NULL;
4283         struct obd_device       *obd;
4284         int                      rc;
4285         ENTRY;
4286
4287         OBD_ALLOC_PTR(data);
4288         if (data == NULL)
4289                 GOTO(out, rc = -ENOMEM);
4290
4291         obd = class_name2obd(next);
4292         if (obd == NULL) {
4293                 CERROR("%s: can't locate next device: %s\n",
4294                        mdt_obd_name(m), next);
4295                 GOTO(out, rc = -ENOTCONN);
4296         }
4297
4298         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4299         data->ocd_version = LUSTRE_VERSION_CODE;
4300
4301         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
4302         if (rc) {
4303                 CERROR("%s: cannot connect to next dev %s (%d)\n",
4304                        mdt_obd_name(m), next, rc);
4305                 GOTO(out, rc);
4306         }
4307
4308 out:
4309         if (data)
4310                 OBD_FREE_PTR(data);
4311         RETURN(rc);
4312 }
4313
4314 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
4315                           struct lustre_cfg *cfg)
4316 {
4317         char                   *dev = lustre_cfg_string(cfg, 0);
4318         int                     rc, name_size, uuid_size;
4319         char                   *name, *uuid, *p;
4320         struct lustre_cfg_bufs *bufs;
4321         struct lustre_cfg      *lcfg;
4322         struct obd_device      *obd;
4323         struct lustre_profile  *lprof;
4324         struct lu_site         *site;
4325         ENTRY;
4326
4327         /* in 1.8 we had the only device in the stack - MDS.
4328          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
4329          * in 2.3 OSD is instantiated by obd_mount.c, so we need
4330          * to generate names and setup MDT, MDD. MDT will be using
4331          * generated name to connect to MDD. for MDD the next device
4332          * will be LOD with name taken from so called "profile" which
4333          * is generated by mount_option line
4334          *
4335          * 1.8 MGS generates config. commands like this:
4336          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
4337          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
4338          * 2.0 MGS generates config. commands like this:
4339          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
4340          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4341          *                    3:lustre-MDT0000-mdtlov  4:f
4342          *
4343          * we generate MDD name from MDT one, just replacing T with D
4344          *
4345          * after all the preparations, the logical equivalent will be
4346          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
4347          *                    3:lustre-MDT0000-mdtlov  4:f
4348          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4349          *                    3:lustre-MDD0000  4:f
4350          *
4351          *  notice we build the stack from down to top: MDD first, then MDT */
4352
4353         name_size = MAX_OBD_NAME;
4354         uuid_size = MAX_OBD_NAME;
4355
4356         OBD_ALLOC(name, name_size);
4357         OBD_ALLOC(uuid, uuid_size);
4358         if (name == NULL || uuid == NULL)
4359                 GOTO(cleanup_mem, rc = -ENOMEM);
4360
4361         OBD_ALLOC_PTR(bufs);
4362         if (!bufs)
4363                 GOTO(cleanup_mem, rc = -ENOMEM);
4364
4365         strcpy(name, dev);
4366         p = strstr(name, "-MDT");
4367         if (p == NULL)
4368                 GOTO(free_bufs, rc = -ENOMEM);
4369         p[3] = 'D';
4370
4371         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
4372
4373         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4374         if (lprof == NULL || lprof->lp_dt == NULL) {
4375                 CERROR("can't find the profile: %s\n",
4376                        lustre_cfg_string(cfg, 0));
4377                 GOTO(free_bufs, rc = -EINVAL);
4378         }
4379
4380         lustre_cfg_bufs_reset(bufs, name);
4381         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
4382         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4383         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4384
4385         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4386         if (lcfg == NULL)
4387                 GOTO(put_profile, rc = -ENOMEM);
4388
4389         rc = class_attach(lcfg);
4390         if (rc)
4391                 GOTO(lcfg_cleanup, rc);
4392
4393         obd = class_name2obd(name);
4394         if (!obd) {
4395                 CERROR("Can not find obd %s (%s in config)\n",
4396                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
4397                 GOTO(lcfg_cleanup, rc = -EINVAL);
4398         }
4399
4400         lustre_cfg_free(lcfg);
4401
4402         lustre_cfg_bufs_reset(bufs, name);
4403         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4404         lustre_cfg_bufs_set_string(bufs, 2, dev);
4405         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4406
4407         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4408         if (lcfg == NULL)
4409                 GOTO(class_detach, rc = -ENOMEM);
4410
4411         rc = class_setup(obd, lcfg);
4412         if (rc)
4413                 GOTO(class_detach, rc);
4414
4415         /* connect to MDD we just setup */
4416         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
4417         if (rc)
4418                 GOTO(class_detach, rc);
4419
4420         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
4421         LASSERT(site);
4422         LASSERT(mdt_lu_site(mdt) == NULL);
4423         mdt->mdt_lu_dev.ld_site = site;
4424         site->ls_top_dev = &mdt->mdt_lu_dev;
4425         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
4426
4427         /* now connect to bottom OSD */
4428         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
4429         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
4430         if (rc)
4431                 GOTO(class_detach, rc);
4432         mdt->mdt_bottom =
4433                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
4434
4435         rc = lu_env_refill((struct lu_env *)env);
4436         if (rc != 0)
4437                 CERROR("Failure to refill session: '%d'\n", rc);
4438
4439         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
4440
4441         EXIT;
4442 class_detach:
4443         if (rc)
4444                 class_detach(obd, lcfg);
4445 lcfg_cleanup:
4446         lustre_cfg_free(lcfg);
4447 put_profile:
4448         class_put_profile(lprof);
4449 free_bufs:
4450         OBD_FREE_PTR(bufs);
4451 cleanup_mem:
4452         if (name)
4453                 OBD_FREE(name, name_size);
4454         if (uuid)
4455                 OBD_FREE(uuid, uuid_size);
4456         RETURN(rc);
4457 }
4458
4459 /* setup quota master target on MDT0 */
4460 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
4461                           struct lustre_cfg *cfg)
4462 {
4463         struct obd_device       *obd;
4464         char                    *dev = lustre_cfg_string(cfg, 0);
4465         char                    *qmtname, *uuid, *p;
4466         struct lustre_cfg_bufs  *bufs;
4467         struct lustre_cfg       *lcfg;
4468         struct lustre_profile   *lprof;
4469         struct obd_connect_data *data;
4470         int                      rc;
4471         ENTRY;
4472
4473         LASSERT(mdt->mdt_qmt_exp == NULL);
4474         LASSERT(mdt->mdt_qmt_dev == NULL);
4475
4476         /* quota master is on MDT0 only for now */
4477         if (mdt->mdt_seq_site.ss_node_id != 0)
4478                 RETURN(0);
4479
4480         /* MGS generates config commands which look as follows:
4481          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4482          *                    3:lustre-MDT0000-mdtlov  4:f
4483          *
4484          * We generate the QMT name from the MDT one, just replacing MD with QM
4485          * after all the preparations, the logical equivalent will be:
4486          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4487          *                    3:lustre-MDT0000-osd  4:f */
4488         OBD_ALLOC(qmtname, MAX_OBD_NAME);
4489         OBD_ALLOC(uuid, UUID_MAX);
4490         OBD_ALLOC_PTR(bufs);
4491         OBD_ALLOC_PTR(data);
4492         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
4493                 GOTO(cleanup_mem, rc = -ENOMEM);
4494
4495         strcpy(qmtname, dev);
4496         p = strstr(qmtname, "-MDT");
4497         if (p == NULL)
4498                 GOTO(cleanup_mem, rc = -ENOMEM);
4499         /* replace MD with QM */
4500         p[1] = 'Q';
4501         p[2] = 'M';
4502
4503         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4504
4505         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4506         if (lprof == NULL || lprof->lp_dt == NULL) {
4507                 CERROR("can't find profile for %s\n",
4508                        lustre_cfg_string(cfg, 0));
4509                 GOTO(cleanup_mem, rc = -EINVAL);
4510         }
4511
4512         lustre_cfg_bufs_reset(bufs, qmtname);
4513         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4514         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4515         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4516
4517         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4518         if (lcfg == NULL)
4519                 GOTO(put_profile, rc = -ENOMEM);
4520
4521         rc = class_attach(lcfg);
4522         if (rc)
4523                 GOTO(lcfg_cleanup, rc);
4524
4525         obd = class_name2obd(qmtname);
4526         if (!obd) {
4527                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4528                        lustre_cfg_string(cfg, 0));
4529                 GOTO(lcfg_cleanup, rc = -EINVAL);
4530         }
4531
4532         lustre_cfg_free(lcfg);
4533
4534         lustre_cfg_bufs_reset(bufs, qmtname);
4535         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4536         lustre_cfg_bufs_set_string(bufs, 2, dev);
4537
4538         /* for quota, the next device should be the OSD device */
4539         lustre_cfg_bufs_set_string(bufs, 3,
4540                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4541
4542         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4543         if (lcfg == NULL)
4544                 GOTO(class_detach, rc = -ENOMEM);
4545
4546         rc = class_setup(obd, lcfg);
4547         if (rc)
4548                 GOTO(class_detach, rc);
4549
4550         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4551
4552         /* configure local quota objects */
4553         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4554                                                    &mdt->mdt_lu_dev,
4555                                                    mdt->mdt_qmt_dev);
4556         if (rc)
4557                 GOTO(class_cleanup, rc);
4558
4559         /* connect to quota master target */
4560         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4561         data->ocd_version = LUSTRE_VERSION_CODE;
4562         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4563                          data, NULL);
4564         if (rc) {
4565                 CERROR("cannot connect to quota master device %s (%d)\n",
4566                        qmtname, rc);
4567                 GOTO(class_cleanup, rc);
4568         }
4569
4570         EXIT;
4571 class_cleanup:
4572         if (rc) {
4573                 class_manual_cleanup(obd);
4574                 mdt->mdt_qmt_dev = NULL;
4575         }
4576 class_detach:
4577         if (rc)
4578                 class_detach(obd, lcfg);
4579 lcfg_cleanup:
4580         lustre_cfg_free(lcfg);
4581 put_profile:
4582         class_put_profile(lprof);
4583 cleanup_mem:
4584         if (bufs)
4585                 OBD_FREE_PTR(bufs);
4586         if (qmtname)
4587                 OBD_FREE(qmtname, MAX_OBD_NAME);
4588         if (uuid)
4589                 OBD_FREE(uuid, UUID_MAX);
4590         if (data)
4591                 OBD_FREE_PTR(data);
4592         return rc;
4593 }
4594
4595 /* Shutdown quota master target associated with mdt */
4596 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4597 {
4598         ENTRY;
4599
4600         if (mdt->mdt_qmt_exp == NULL)
4601                 RETURN_EXIT;
4602         LASSERT(mdt->mdt_qmt_dev != NULL);
4603
4604         /* the qmt automatically shuts down when the mdt disconnects */
4605         obd_disconnect(mdt->mdt_qmt_exp);
4606         mdt->mdt_qmt_exp = NULL;
4607         mdt->mdt_qmt_dev = NULL;
4608         EXIT;
4609 }
4610
4611 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4612  * for now. This will be removed along with converting rest of MDT code
4613  * to use tgt_session_info */
4614 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4615 {
4616         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4617         int                      rc;
4618
4619         rc = mdt_getxattr(info);
4620
4621         mdt_thread_info_fini(info);
4622         return rc;
4623 }
4624
4625 static struct tgt_handler mdt_tgt_handlers[] = {
4626 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4627                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4628                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4629 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4630                 0,                      MDS_DISCONNECT, tgt_disconnect,
4631                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4632 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4633                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4634                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4635 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4636 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GET_ROOT,   mdt_get_root),
4637 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4638 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4639                                                         mdt_getattr_name),
4640 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4641 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4642 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4643 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4644 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4645 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4646 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4647 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4648                                                         mdt_hsm_progress),
4649 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4650                                                         mdt_hsm_ct_register),
4651 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4652                                                         mdt_hsm_ct_unregister),
4653 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4654                                                         mdt_hsm_state_get),
4655 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4656                                                         mdt_hsm_state_set),
4657 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4658 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4659                                                         mdt_hsm_request),
4660 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4661             MDS_SWAP_LAYOUTS,
4662             mdt_swap_layouts),
4663 };
4664
4665 static struct tgt_handler mdt_sec_ctx_ops[] = {
4666 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4667 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4668 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4669 };
4670
4671 static struct tgt_handler mdt_quota_ops[] = {
4672 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4673 };
4674
4675 static struct tgt_opc_slice mdt_common_slice[] = {
4676         {
4677                 .tos_opc_start  = MDS_FIRST_OPC,
4678                 .tos_opc_end    = MDS_LAST_OPC,
4679                 .tos_hs         = mdt_tgt_handlers
4680         },
4681         {
4682                 .tos_opc_start  = OBD_FIRST_OPC,
4683                 .tos_opc_end    = OBD_LAST_OPC,
4684                 .tos_hs         = tgt_obd_handlers
4685         },
4686         {
4687                 .tos_opc_start  = LDLM_FIRST_OPC,
4688                 .tos_opc_end    = LDLM_LAST_OPC,
4689                 .tos_hs         = tgt_dlm_handlers
4690         },
4691         {
4692                 .tos_opc_start  = SEC_FIRST_OPC,
4693                 .tos_opc_end    = SEC_LAST_OPC,
4694                 .tos_hs         = mdt_sec_ctx_ops
4695         },
4696         {
4697                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4698                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4699                 .tos_hs         = tgt_out_handlers
4700         },
4701         {
4702                 .tos_opc_start  = FLD_FIRST_OPC,
4703                 .tos_opc_end    = FLD_LAST_OPC,
4704                 .tos_hs         = fld_handlers
4705         },
4706         {
4707                 .tos_opc_start  = SEQ_FIRST_OPC,
4708                 .tos_opc_end    = SEQ_LAST_OPC,
4709                 .tos_hs         = seq_handlers
4710         },
4711         {
4712                 .tos_opc_start  = QUOTA_DQACQ,
4713                 .tos_opc_end    = QUOTA_LAST_OPC,
4714                 .tos_hs         = mdt_quota_ops
4715         },
4716         {
4717                 .tos_opc_start  = LLOG_FIRST_OPC,
4718                 .tos_opc_end    = LLOG_LAST_OPC,
4719                 .tos_hs         = tgt_llog_handlers
4720         },
4721         {
4722                 .tos_opc_start  = LFSCK_FIRST_OPC,
4723                 .tos_opc_end    = LFSCK_LAST_OPC,
4724                 .tos_hs         = tgt_lfsck_handlers
4725         },
4726
4727         {
4728                 .tos_hs         = NULL
4729         }
4730 };
4731
4732 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4733 {
4734         struct md_device *next = m->mdt_child;
4735         struct lu_device *d = &m->mdt_lu_dev;
4736         struct obd_device *obd = mdt2obd_dev(m);
4737         struct lfsck_stop stop;
4738
4739         ENTRY;
4740         stop.ls_status = LS_PAUSED;
4741         stop.ls_flags = 0;
4742         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4743
4744         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4745         ping_evictor_stop();
4746
4747         if (m->mdt_opts.mo_coordinator)
4748                 mdt_hsm_cdt_stop(m);
4749
4750         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4751         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4752
4753         if (m->mdt_namespace != NULL)
4754                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
4755                                           d->ld_obd->obd_force);
4756
4757         obd_exports_barrier(obd);
4758         obd_zombie_barrier();
4759
4760         mdt_quota_fini(env, m);
4761
4762         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
4763
4764         /* Calling the cleanup functions in the same order as in the mdt_init0
4765          * error path
4766          */
4767         mdt_procfs_fini(m);
4768
4769         target_recovery_fini(obd);
4770         upcall_cache_cleanup(m->mdt_identity_cache);
4771         m->mdt_identity_cache = NULL;
4772
4773         mdt_fs_cleanup(env, m);
4774
4775         tgt_fini(env, &m->mdt_lut);
4776
4777         mdt_hsm_cdt_fini(m);
4778
4779         if (m->mdt_namespace != NULL) {
4780                 ldlm_namespace_free_post(m->mdt_namespace);
4781                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4782         }
4783
4784         if (m->mdt_md_root != NULL) {
4785                 mdt_object_put(env, m->mdt_md_root);
4786                 m->mdt_md_root = NULL;
4787         }
4788
4789         mdt_seq_fini(env, m);
4790
4791         mdt_fld_fini(env, m);
4792
4793         /*
4794          * Finish the stack
4795          */
4796         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4797
4798         LASSERT(atomic_read(&d->ld_ref) == 0);
4799
4800         server_put_mount(mdt_obd_name(m), true);
4801
4802         EXIT;
4803 }
4804
4805 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4806
4807 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4808                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4809 {
4810         struct mdt_thread_info    *info;
4811         struct obd_device         *obd;
4812         const char                *dev = lustre_cfg_string(cfg, 0);
4813         const char                *num = lustre_cfg_string(cfg, 2);
4814         struct lustre_mount_info  *lmi = NULL;
4815         struct lustre_sb_info     *lsi;
4816         struct lu_site            *s;
4817         struct seq_server_site    *ss_site;
4818         const char                *identity_upcall = "NONE";
4819         struct md_device          *next;
4820         int                        rc;
4821         long                       node_id;
4822         mntopt_t                   mntopts;
4823         ENTRY;
4824
4825         lu_device_init(&m->mdt_lu_dev, ldt);
4826         /*
4827          * Environment (env) might be missing mdt_thread_key values at that
4828          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4829          * mode.
4830          *
4831          * Usually device allocation path doesn't use module key values, but
4832          * mdt has to do a lot of work here, so allocate key value.
4833          */
4834         rc = lu_env_refill((struct lu_env *)env);
4835         if (rc != 0)
4836                 RETURN(rc);
4837
4838         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4839         LASSERT(info != NULL);
4840
4841         obd = class_name2obd(dev);
4842         LASSERT(obd != NULL);
4843
4844         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4845         m->mdt_opts.mo_evict_tgt_nids = 1;
4846         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4847
4848         /* default is coordinator off, it is started through conf_param
4849          * or /proc */
4850         m->mdt_opts.mo_coordinator = 0;
4851
4852         lmi = server_get_mount(dev);
4853         if (lmi == NULL) {
4854                 CERROR("Cannot get mount info for %s!\n", dev);
4855                 RETURN(-EFAULT);
4856         } else {
4857                 lsi = s2lsi(lmi->lmi_sb);
4858                 /* CMD is supported only in IAM mode */
4859                 LASSERT(num);
4860                 node_id = simple_strtol(num, NULL, 10);
4861                 obd->u.obt.obt_magic = OBT_MAGIC;
4862                 if (lsi->lsi_lmd != NULL &&
4863                     lsi->lsi_lmd->lmd_flags & LMD_FLG_SKIP_LFSCK)
4864                         m->mdt_skip_lfsck = 1;
4865         }
4866
4867         m->mdt_squash.rsi_uid = 0;
4868         m->mdt_squash.rsi_gid = 0;
4869         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
4870         init_rwsem(&m->mdt_squash.rsi_sem);
4871         spin_lock_init(&m->mdt_lock);
4872         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4873         m->mdt_enable_remote_dir = 0;
4874         m->mdt_enable_remote_dir_gid = 0;
4875
4876         atomic_set(&m->mdt_mds_mds_conns, 0);
4877         atomic_set(&m->mdt_async_commit_count, 0);
4878
4879         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4880         m->mdt_lu_dev.ld_obd = obd;
4881         /* Set this lu_device to obd for error handling purposes. */
4882         obd->obd_lu_dev = &m->mdt_lu_dev;
4883
4884         /* init the stack */
4885         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4886         if (rc) {
4887                 CERROR("%s: Can't init device stack, rc %d\n",
4888                        mdt_obd_name(m), rc);
4889                 GOTO(err_lmi, rc);
4890         }
4891
4892         s = mdt_lu_site(m);
4893         ss_site = mdt_seq_site(m);
4894         s->ld_seq_site = ss_site;
4895         ss_site->ss_lu = s;
4896
4897         /* set server index */
4898         ss_site->ss_node_id = node_id;
4899
4900         /* failover is the default
4901          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4902          * assumed whose ss_node_id == 0 XXX
4903          * */
4904         obd->obd_replayable = 1;
4905         /* No connection accepted until configurations will finish */
4906         obd->obd_no_conn = 1;
4907
4908         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4909                 char *str = lustre_cfg_string(cfg, 4);
4910                 if (strchr(str, 'n')) {
4911                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4912                         obd->obd_replayable = 0;
4913                 }
4914         }
4915
4916         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4917         if (rc)
4918                 GOTO(err_fini_stack, rc);
4919
4920         rc = mdt_seq_init(env, m);
4921         if (rc)
4922                 GOTO(err_fini_fld, rc);
4923
4924         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4925                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4926         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4927                                               LDLM_NAMESPACE_SERVER,
4928                                               LDLM_NAMESPACE_GREEDY,
4929                                               LDLM_NS_TYPE_MDT);
4930         if (m->mdt_namespace == NULL)
4931                 GOTO(err_fini_seq, rc = -ENOMEM);
4932
4933         m->mdt_namespace->ns_lvbp = m;
4934         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4935
4936         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4937         /* set obd_namespace for compatibility with old code */
4938         obd->obd_namespace = m->mdt_namespace;
4939
4940         rc = mdt_hsm_cdt_init(m);
4941         if (rc != 0) {
4942                 CERROR("%s: error initializing coordinator, rc %d\n",
4943                        mdt_obd_name(m), rc);
4944                 GOTO(err_free_ns, rc);
4945         }
4946
4947         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4948                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4949                       OBD_FAIL_MDS_ALL_REPLY_NET);
4950         if (rc)
4951                 GOTO(err_free_hsm, rc);
4952
4953         rc = mdt_fs_setup(env, m, obd, lsi);
4954         if (rc)
4955                 GOTO(err_tgt, rc);
4956
4957         tgt_adapt_sptlrpc_conf(&m->mdt_lut);
4958
4959         next = m->mdt_child;
4960         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4961                                          &mntopts);
4962         if (rc)
4963                 GOTO(err_fs_cleanup, rc);
4964
4965         if (mntopts & MNTOPT_USERXATTR)
4966                 m->mdt_opts.mo_user_xattr = 1;
4967         else
4968                 m->mdt_opts.mo_user_xattr = 0;
4969
4970         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4971         if (rc)
4972                 GOTO(err_fs_cleanup, rc);
4973
4974         if (mntopts & MNTOPT_ACL)
4975                 m->mdt_opts.mo_acl = 1;
4976         else
4977                 m->mdt_opts.mo_acl = 0;
4978
4979         /* XXX: to support suppgid for ACL, we enable identity_upcall
4980          * by default, otherwise, maybe got unexpected -EACCESS. */
4981         if (m->mdt_opts.mo_acl)
4982                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4983
4984         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4985                                                 identity_upcall,
4986                                                 &mdt_identity_upcall_cache_ops);
4987         if (IS_ERR(m->mdt_identity_cache)) {
4988                 rc = PTR_ERR(m->mdt_identity_cache);
4989                 m->mdt_identity_cache = NULL;
4990                 GOTO(err_fs_cleanup, rc);
4991         }
4992
4993         rc = mdt_procfs_init(m, dev);
4994         if (rc) {
4995                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4996                 GOTO(err_recovery, rc);
4997         }
4998
4999         rc = mdt_quota_init(env, m, cfg);
5000         if (rc)
5001                 GOTO(err_procfs, rc);
5002
5003         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
5004         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
5005                            "mdt_ldlm_client", m->mdt_ldlm_client);
5006
5007         ping_evictor_start();
5008
5009         /* recovery will be started upon mdt_prepare()
5010          * when the whole stack is complete and ready
5011          * to serve the requests */
5012
5013         /* Reduce the initial timeout on an MDS because it doesn't need such
5014          * a long timeout as an OST does. Adaptive timeouts will adjust this
5015          * value appropriately. */
5016         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
5017                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
5018
5019         RETURN(0);
5020 err_procfs:
5021         mdt_procfs_fini(m);
5022 err_recovery:
5023         target_recovery_fini(obd);
5024         upcall_cache_cleanup(m->mdt_identity_cache);
5025         m->mdt_identity_cache = NULL;
5026 err_fs_cleanup:
5027         mdt_fs_cleanup(env, m);
5028 err_tgt:
5029         tgt_fini(env, &m->mdt_lut);
5030 err_free_hsm:
5031         mdt_hsm_cdt_fini(m);
5032 err_free_ns:
5033         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
5034         obd->obd_namespace = m->mdt_namespace = NULL;
5035 err_fini_seq:
5036         mdt_seq_fini(env, m);
5037 err_fini_fld:
5038         mdt_fld_fini(env, m);
5039 err_fini_stack:
5040         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
5041 err_lmi:
5042         if (lmi)
5043                 server_put_mount(dev, true);
5044         return(rc);
5045 }
5046
5047 /* For interoperability, the left element is old parameter, the right one
5048  * is the new version of the parameter, if some parameter is deprecated,
5049  * the new version should be set as NULL. */
5050 static struct cfg_interop_param mdt_interop_param[] = {
5051         { "mdt.group_upcall",   NULL },
5052         { "mdt.quota_type",     NULL },
5053         { "mdd.quota_type",     NULL },
5054         { "mdt.som",            NULL },
5055         { "mdt.rootsquash",     "mdt.root_squash" },
5056         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
5057         { NULL }
5058 };
5059
5060 /* used by MGS to process specific configurations */
5061 static int mdt_process_config(const struct lu_env *env,
5062                               struct lu_device *d, struct lustre_cfg *cfg)
5063 {
5064         struct mdt_device *m = mdt_dev(d);
5065         struct md_device *md_next = m->mdt_child;
5066         struct lu_device *next = md2lu_dev(md_next);
5067         int rc;
5068         ENTRY;
5069
5070         switch (cfg->lcfg_command) {
5071         case LCFG_PARAM: {
5072                 struct obd_device          *obd = d->ld_obd;
5073
5074                 /* For interoperability */
5075                 struct cfg_interop_param   *ptr = NULL;
5076                 struct lustre_cfg          *old_cfg = NULL;
5077                 char                       *param = NULL;
5078
5079                 param = lustre_cfg_string(cfg, 1);
5080                 if (param == NULL) {
5081                         CERROR("param is empty\n");
5082                         rc = -EINVAL;
5083                         break;
5084                 }
5085
5086                 ptr = class_find_old_param(param, mdt_interop_param);
5087                 if (ptr != NULL) {
5088                         if (ptr->new_param == NULL) {
5089                                 rc = 0;
5090                                 CWARN("For interoperability, skip this %s."
5091                                       " It is obsolete.\n", ptr->old_param);
5092                                 break;
5093                         }
5094
5095                         CWARN("Found old param %s, changed it to %s.\n",
5096                               ptr->old_param, ptr->new_param);
5097
5098                         old_cfg = cfg;
5099                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
5100                         if (IS_ERR(cfg)) {
5101                                 rc = PTR_ERR(cfg);
5102                                 break;
5103                         }
5104                 }
5105
5106                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
5107                                               cfg, obd);
5108                 if (rc > 0 || rc == -ENOSYS) {
5109                         /* is it an HSM var ? */
5110                         rc = class_process_proc_param(PARAM_HSM,
5111                                                       hsm_cdt_get_proc_vars(),
5112                                                       cfg, obd);
5113                         if (rc > 0 || rc == -ENOSYS)
5114                                 /* we don't understand; pass it on */
5115                                 rc = next->ld_ops->ldo_process_config(env, next,
5116                                                                       cfg);
5117                 }
5118
5119                 if (old_cfg != NULL)
5120                         lustre_cfg_free(cfg);
5121
5122                 break;
5123         }
5124         default:
5125                 /* others are passed further */
5126                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
5127                 break;
5128         }
5129         RETURN(rc);
5130 }
5131
5132 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
5133                                           const struct lu_object_header *hdr,
5134                                           struct lu_device *d)
5135 {
5136         struct mdt_object *mo;
5137
5138         ENTRY;
5139
5140         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
5141         if (mo != NULL) {
5142                 struct lu_object *o;
5143                 struct lu_object_header *h;
5144
5145                 o = &mo->mot_obj;
5146                 h = &mo->mot_header;
5147                 lu_object_header_init(h);
5148                 lu_object_init(o, h, d);
5149                 lu_object_add_top(h, o);
5150                 o->lo_ops = &mdt_obj_ops;
5151                 spin_lock_init(&mo->mot_write_lock);
5152                 mutex_init(&mo->mot_lov_mutex);
5153                 init_rwsem(&mo->mot_open_sem);
5154                 atomic_set(&mo->mot_open_count, 0);
5155                 RETURN(o);
5156         }
5157         RETURN(NULL);
5158 }
5159
5160 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
5161                            const struct lu_object_conf *unused)
5162 {
5163         struct mdt_device *d = mdt_dev(o->lo_dev);
5164         struct lu_device  *under;
5165         struct lu_object  *below;
5166         int                rc = 0;
5167         ENTRY;
5168
5169         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
5170                PFID(lu_object_fid(o)));
5171
5172         under = &d->mdt_child->md_lu_dev;
5173         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
5174         if (below != NULL) {
5175                 lu_object_add(o, below);
5176         } else
5177                 rc = -ENOMEM;
5178
5179         RETURN(rc);
5180 }
5181
5182 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
5183 {
5184         struct mdt_object *mo = mdt_obj(o);
5185         struct lu_object_header *h;
5186         ENTRY;
5187
5188         h = o->lo_header;
5189         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
5190                PFID(lu_object_fid(o)));
5191
5192         LASSERT(atomic_read(&mo->mot_open_count) == 0);
5193         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
5194
5195         lu_object_fini(o);
5196         lu_object_header_fini(h);
5197         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
5198
5199         EXIT;
5200 }
5201
5202 static int mdt_object_print(const struct lu_env *env, void *cookie,
5203                             lu_printer_t p, const struct lu_object *o)
5204 {
5205         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
5206
5207         return (*p)(env, cookie,
5208                     LUSTRE_MDT_NAME"-object@%p(%s %s, writecount=%d)",
5209                     mdto, mdto->mot_lov_created ? "lov_created" : "",
5210                     mdto->mot_cache_attr ? "cache_attr" : "",
5211                     mdto->mot_write_count);
5212 }
5213
5214 static int mdt_prepare(const struct lu_env *env,
5215                 struct lu_device *pdev,
5216                 struct lu_device *cdev)
5217 {
5218         struct mdt_device *mdt = mdt_dev(cdev);
5219         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
5220         struct obd_device *obd = cdev->ld_obd;
5221         int rc;
5222
5223         ENTRY;
5224
5225         LASSERT(obd);
5226
5227         rc = next->ld_ops->ldo_prepare(env, cdev, next);
5228         if (rc)
5229                 RETURN(rc);
5230
5231         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
5232         if (rc)
5233                 RETURN(rc);
5234
5235         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
5236         if (rc)
5237                 RETURN(rc);
5238
5239         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
5240         /* The LFSCK instance is registered just now, so it must be there when
5241          * register the namespace to such instance. */
5242         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
5243
5244         if (mdt->mdt_seq_site.ss_node_id == 0) {
5245                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
5246                                                          &mdt->mdt_md_root_fid);
5247                 if (rc)
5248                         RETURN(rc);
5249         }
5250
5251         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
5252
5253         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
5254         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
5255         LASSERT(obd->obd_no_conn);
5256         spin_lock(&obd->obd_dev_lock);
5257         obd->obd_no_conn = 0;
5258         spin_unlock(&obd->obd_dev_lock);
5259
5260         if (obd->obd_recovering == 0)
5261                 mdt_postrecov(env, mdt);
5262
5263         RETURN(rc);
5264 }
5265
5266 const struct lu_device_operations mdt_lu_ops = {
5267         .ldo_object_alloc   = mdt_object_alloc,
5268         .ldo_process_config = mdt_process_config,
5269         .ldo_prepare        = mdt_prepare,
5270 };
5271
5272 static const struct lu_object_operations mdt_obj_ops = {
5273         .loo_object_init    = mdt_object_init,
5274         .loo_object_free    = mdt_object_free,
5275         .loo_object_print   = mdt_object_print
5276 };
5277
5278 static int mdt_obd_set_info_async(const struct lu_env *env,
5279                                   struct obd_export *exp,
5280                                   __u32 keylen, void *key,
5281                                   __u32 vallen, void *val,
5282                                   struct ptlrpc_request_set *set)
5283 {
5284         int rc;
5285
5286         ENTRY;
5287
5288         if (KEY_IS(KEY_SPTLRPC_CONF)) {
5289                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp));
5290                 RETURN(rc);
5291         }
5292
5293         RETURN(0);
5294 }
5295
5296 /**
5297  * Match client and server connection feature flags.
5298  *
5299  * Compute the compatibility flags for a connection request based on
5300  * features mutually supported by client and server.
5301  *
5302  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
5303  * must not be updated here, otherwise a partially initialized value may
5304  * be exposed. After the connection request is successfully processed,
5305  * the top-level MDT connect request handler atomically updates the export
5306  * connect flags from the obd_connect_data::ocd_connect_flags field of the
5307  * reply. \see mdt_connect().
5308  *
5309  * Before 2.7.50 clients will send a struct obd_connect_data_v1 rather than a
5310  * full struct obd_connect_data. So care must be taken when accessing fields
5311  * that are not present in struct obd_connect_data_v1. See LU-16.
5312  *
5313  * \param exp   the obd_export associated with this client/target pair
5314  * \param mdt   the target device for the connection
5315  * \param data  stores data for this connect request
5316  *
5317  * \retval 0       success
5318  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
5319  * \retval -EBADE  client and server feature requirements are incompatible
5320  */
5321 static int mdt_connect_internal(struct obd_export *exp,
5322                                 struct mdt_device *mdt,
5323                                 struct obd_connect_data *data)
5324 {
5325         LASSERT(data != NULL);
5326
5327         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
5328
5329         if (mdt->mdt_bottom->dd_rdonly &&
5330             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5331             !(data->ocd_connect_flags & OBD_CONNECT_RDONLY))
5332                 RETURN(-EACCES);
5333
5334         if (data->ocd_connect_flags & OBD_CONNECT_FLAGS2)
5335                 data->ocd_connect_flags2 &= MDT_CONNECT_SUPPORTED2;
5336
5337         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
5338
5339         if (!(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5340             !(data->ocd_connect_flags & OBD_CONNECT_IBITS)) {
5341                 CWARN("%s: client %s does not support ibits lock, either "
5342                       "very old or an invalid client: flags %#llx\n",
5343                       mdt_obd_name(mdt), exp->exp_client_uuid.uuid,
5344                       data->ocd_connect_flags);
5345                 return -EBADE;
5346         }
5347
5348         if (!mdt->mdt_opts.mo_acl)
5349                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
5350
5351         if (!mdt->mdt_opts.mo_user_xattr)
5352                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
5353
5354         if (OCD_HAS_FLAG(data, BRW_SIZE)) {
5355                 data->ocd_brw_size = min(data->ocd_brw_size, MD_MAX_BRW_SIZE);
5356                 if (data->ocd_brw_size == 0) {
5357                         CERROR("%s: cli %s/%p ocd_connect_flags: %#llx "
5358                                "ocd_version: %x ocd_grant: %d ocd_index: %u "
5359                                "ocd_brw_size unexpectedly zero, network data "
5360                                "corruption? Refusing to connect this client\n",
5361                                mdt_obd_name(mdt),
5362                                exp->exp_client_uuid.uuid,
5363                                exp, data->ocd_connect_flags, data->ocd_version,
5364                                data->ocd_grant, data->ocd_index);
5365                         return -EPROTO;
5366                 }
5367         }
5368
5369         /* NB: Disregard the rule against updating
5370          * exp_connect_data.ocd_connect_flags in this case, since
5371          * tgt_client_new() needs to know if this is a lightweight
5372          * connection, and it is safe to expose this flag before
5373          * connection processing completes. */
5374         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
5375                 spin_lock(&exp->exp_lock);
5376                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
5377                 spin_unlock(&exp->exp_lock);
5378         }
5379
5380         data->ocd_version = LUSTRE_VERSION_CODE;
5381
5382         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
5383                 CWARN("%s: MDS requires FID support, but client not\n",
5384                       mdt_obd_name(mdt));
5385                 return -EBADE;
5386         }
5387
5388         if (OCD_HAS_FLAG(data, PINGLESS)) {
5389                 if (ptlrpc_pinger_suppress_pings()) {
5390                         spin_lock(&exp->exp_obd->obd_dev_lock);
5391                         list_del_init(&exp->exp_obd_chain_timed);
5392                         spin_unlock(&exp->exp_obd->obd_dev_lock);
5393                 } else {
5394                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
5395                 }
5396         }
5397
5398         data->ocd_max_easize = mdt->mdt_max_ea_size;
5399
5400         /* NB: Disregard the rule against updating
5401          * exp_connect_data.ocd_connect_flags in this case, since
5402          * tgt_client_new() needs to know if this is client supports
5403          * multiple modify RPCs, and it is safe to expose this flag before
5404          * connection processing completes. */
5405         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
5406                 data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
5407                 spin_lock(&exp->exp_lock);
5408                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
5409                 spin_unlock(&exp->exp_lock);
5410         }
5411
5412         return 0;
5413 }
5414
5415 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
5416                                    struct mdt_thread_info *info,
5417                                    struct mdt_file_data *mfd)
5418 {
5419         struct lu_context ses;
5420         int rc;
5421         ENTRY;
5422
5423         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
5424         if (rc)
5425                 RETURN(rc);
5426
5427         env->le_ses = &ses;
5428         lu_context_enter(&ses);
5429
5430         mdt_ucred(info)->uc_valid = UCRED_OLD;
5431         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
5432
5433         lu_context_exit(&ses);
5434         lu_context_fini(&ses);
5435         env->le_ses = NULL;
5436
5437         RETURN(rc);
5438 }
5439
5440 static int mdt_export_cleanup(struct obd_export *exp)
5441 {
5442         struct list_head         closing_list;
5443         struct mdt_export_data  *med = &exp->exp_mdt_data;
5444         struct obd_device       *obd = exp->exp_obd;
5445         struct mdt_device       *mdt;
5446         struct mdt_thread_info  *info;
5447         struct lu_env            env;
5448         struct mdt_file_data    *mfd, *n;
5449         int rc = 0;
5450         ENTRY;
5451
5452         INIT_LIST_HEAD(&closing_list);
5453         spin_lock(&med->med_open_lock);
5454         while (!list_empty(&med->med_open_head)) {
5455                 struct list_head *tmp = med->med_open_head.next;
5456                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
5457
5458                 /* Remove mfd handle so it can't be found again.
5459                  * We are consuming the mfd_list reference here. */
5460                 class_handle_unhash(&mfd->mfd_handle);
5461                 list_move_tail(&mfd->mfd_list, &closing_list);
5462         }
5463         spin_unlock(&med->med_open_lock);
5464         mdt = mdt_dev(obd->obd_lu_dev);
5465         LASSERT(mdt != NULL);
5466
5467         rc = lu_env_init(&env, LCT_MD_THREAD);
5468         if (rc)
5469                 RETURN(rc);
5470
5471         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5472         LASSERT(info != NULL);
5473         memset(info, 0, sizeof *info);
5474         info->mti_env = &env;
5475         info->mti_mdt = mdt;
5476         info->mti_exp = exp;
5477
5478         if (!list_empty(&closing_list)) {
5479                 struct md_attr *ma = &info->mti_attr;
5480
5481                 /* Close any open files (which may also cause orphan
5482                  * unlinking). */
5483                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
5484                         list_del_init(&mfd->mfd_list);
5485                         ma->ma_need = ma->ma_valid = 0;
5486
5487                         /* This file is being closed due to an eviction, it
5488                          * could have been modified and now dirty regarding to
5489                          * HSM archive, check this!
5490                          * The logic here is to mark a file dirty if there's a
5491                          * chance it was dirtied before the client was evicted,
5492                          * so that we don't have to wait for a release attempt
5493                          * before finding out the file was actually dirty and
5494                          * fail the release. Aggressively marking it dirty here
5495                          * will cause the policy engine to attempt to
5496                          * re-archive it; when rearchiving, we can compare the
5497                          * current version to the HSM data_version and make the
5498                          * archive request into a noop if it's not actually
5499                          * dirty.
5500                          */
5501                         if (mfd->mfd_mode & FMODE_WRITE)
5502                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
5503
5504                         /* Don't unlink orphan on failover umount, LU-184 */
5505                         if (exp->exp_obd->obd_fail) {
5506                                 ma->ma_valid = MA_FLAGS;
5507                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
5508                         }
5509                         mdt_mfd_close(info, mfd);
5510                 }
5511         }
5512         info->mti_mdt = NULL;
5513         /* cleanup client slot early */
5514         tgt_client_del(&env, exp);
5515         lu_env_fini(&env);
5516
5517         RETURN(rc);
5518 }
5519
5520 static inline void mdt_enable_slc(struct mdt_device *mdt)
5521 {
5522         if (mdt->mdt_lut.lut_sync_lock_cancel == NEVER_SYNC_ON_CANCEL)
5523                 mdt->mdt_lut.lut_sync_lock_cancel = BLOCKING_SYNC_ON_CANCEL;
5524 }
5525
5526 static inline void mdt_disable_slc(struct mdt_device *mdt)
5527 {
5528         if (mdt->mdt_lut.lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL)
5529                 mdt->mdt_lut.lut_sync_lock_cancel = NEVER_SYNC_ON_CANCEL;
5530 }
5531
5532 static int mdt_obd_disconnect(struct obd_export *exp)
5533 {
5534         int rc;
5535         ENTRY;
5536
5537         LASSERT(exp);
5538         class_export_get(exp);
5539
5540         if ((exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) &&
5541             !(exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)) {
5542                 struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
5543
5544                 if (atomic_dec_and_test(&mdt->mdt_mds_mds_conns))
5545                         mdt_disable_slc(mdt);
5546         }
5547
5548         rc = server_disconnect_export(exp);
5549         if (rc != 0)
5550                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
5551
5552         rc = mdt_export_cleanup(exp);
5553         nodemap_del_member(exp);
5554         class_export_put(exp);
5555         RETURN(rc);
5556 }
5557
5558 /* mds_connect copy */
5559 static int mdt_obd_connect(const struct lu_env *env,
5560                            struct obd_export **exp, struct obd_device *obd,
5561                            struct obd_uuid *cluuid,
5562                            struct obd_connect_data *data,
5563                            void *localdata)
5564 {
5565         struct obd_export       *lexp;
5566         struct lustre_handle    conn = { 0 };
5567         struct mdt_device       *mdt;
5568         int                      rc;
5569         lnet_nid_t              *client_nid = localdata;
5570         ENTRY;
5571
5572         LASSERT(env != NULL);
5573         LASSERT(data != NULL);
5574
5575         if (!exp || !obd || !cluuid)
5576                 RETURN(-EINVAL);
5577
5578         mdt = mdt_dev(obd->obd_lu_dev);
5579
5580         if ((data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5581             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5582                 atomic_inc(&mdt->mdt_mds_mds_conns);
5583                 mdt_enable_slc(mdt);
5584         }
5585
5586         /*
5587          * first, check whether the stack is ready to handle requests
5588          * XXX: probably not very appropriate method is used now
5589          *      at some point we should find a better one
5590          */
5591         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) &&
5592             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
5593             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
5594                 rc = obd_get_info(env, mdt->mdt_child_exp,
5595                                   sizeof(KEY_OSP_CONNECTED),
5596                                   KEY_OSP_CONNECTED, NULL, NULL);
5597                 if (rc)
5598                         RETURN(-EAGAIN);
5599                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5600         }
5601
5602         rc = class_connect(&conn, obd, cluuid);
5603         if (rc)
5604                 RETURN(rc);
5605
5606         lexp = class_conn2export(&conn);
5607         LASSERT(lexp != NULL);
5608
5609         rc = nodemap_add_member(*client_nid, lexp);
5610         if (rc != 0 && rc != -EEXIST)
5611                 GOTO(out, rc);
5612
5613         rc = mdt_connect_internal(lexp, mdt, data);
5614         if (rc == 0) {
5615                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5616
5617                 LASSERT(lcd);
5618                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5619                 rc = tgt_client_new(env, lexp);
5620                 if (rc == 0)
5621                         mdt_export_stats_init(obd, lexp, localdata);
5622         }
5623 out:
5624         if (rc != 0) {
5625                 class_disconnect(lexp);
5626                 nodemap_del_member(lexp);
5627                 *exp = NULL;
5628         } else {
5629                 *exp = lexp;
5630                 /* Because we do not want this export to be evicted by pinger,
5631                  * let's not add this export to the timed chain list. */
5632                 if (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
5633                         spin_lock(&lexp->exp_obd->obd_dev_lock);
5634                         list_del_init(&lexp->exp_obd_chain_timed);
5635                         spin_unlock(&lexp->exp_obd->obd_dev_lock);
5636                 }
5637         }
5638
5639         RETURN(rc);
5640 }
5641
5642 static int mdt_obd_reconnect(const struct lu_env *env,
5643                              struct obd_export *exp, struct obd_device *obd,
5644                              struct obd_uuid *cluuid,
5645                              struct obd_connect_data *data,
5646                              void *localdata)
5647 {
5648         lnet_nid_t             *client_nid = localdata;
5649         int                     rc;
5650         ENTRY;
5651
5652         if (exp == NULL || obd == NULL || cluuid == NULL)
5653                 RETURN(-EINVAL);
5654
5655         rc = nodemap_add_member(*client_nid, exp);
5656         if (rc != 0 && rc != -EEXIST)
5657                 RETURN(rc);
5658
5659         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5660         if (rc == 0)
5661                 mdt_export_stats_init(obd, exp, localdata);
5662         else
5663                 nodemap_del_member(exp);
5664
5665         RETURN(rc);
5666 }
5667
5668 /* FIXME: Can we avoid using these two interfaces? */
5669 static int mdt_init_export(struct obd_export *exp)
5670 {
5671         struct mdt_export_data *med = &exp->exp_mdt_data;
5672         int                     rc;
5673         ENTRY;
5674
5675         INIT_LIST_HEAD(&med->med_open_head);
5676         spin_lock_init(&med->med_open_lock);
5677         spin_lock(&exp->exp_lock);
5678         exp->exp_connecting = 1;
5679         spin_unlock(&exp->exp_lock);
5680
5681         /* self-export doesn't need client data and ldlm initialization */
5682         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5683                                      &exp->exp_client_uuid)))
5684                 RETURN(0);
5685
5686         rc = tgt_client_alloc(exp);
5687         if (rc)
5688                 GOTO(err, rc);
5689
5690         rc = ldlm_init_export(exp);
5691         if (rc)
5692                 GOTO(err_free, rc);
5693
5694         RETURN(rc);
5695
5696 err_free:
5697         tgt_client_free(exp);
5698 err:
5699         CERROR("%s: Failed to initialize export: rc = %d\n",
5700                exp->exp_obd->obd_name, rc);
5701         return rc;
5702 }
5703
5704 static int mdt_destroy_export(struct obd_export *exp)
5705 {
5706         ENTRY;
5707
5708         target_destroy_export(exp);
5709         /* destroy can be called from failed obd_setup, so
5710          * checking uuid is safer than obd_self_export */
5711         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5712                                      &exp->exp_client_uuid)))
5713                 RETURN(0);
5714
5715         ldlm_destroy_export(exp);
5716         tgt_client_free(exp);
5717
5718         LASSERT(list_empty(&exp->exp_outstanding_replies));
5719         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
5720
5721         RETURN(0);
5722 }
5723
5724 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5725                    struct linkea_data *ldata)
5726 {
5727         int rc;
5728
5729         LASSERT(ldata->ld_buf->lb_buf != NULL);
5730
5731         if (!mdt_object_exists(mdt_obj))
5732                 return -ENODATA;
5733
5734         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5735                           ldata->ld_buf, XATTR_NAME_LINK);
5736         if (rc == -ERANGE) {
5737                 /* Buf was too small, figure out what we need. */
5738                 lu_buf_free(ldata->ld_buf);
5739                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5740                                   ldata->ld_buf, XATTR_NAME_LINK);
5741                 if (rc < 0)
5742                         return rc;
5743                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5744                 if (ldata->ld_buf->lb_buf == NULL)
5745                         return -ENOMEM;
5746                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5747                                   ldata->ld_buf, XATTR_NAME_LINK);
5748         }
5749         if (rc < 0)
5750                 return rc;
5751
5752         return linkea_init_with_rec(ldata);
5753 }
5754
5755 /**
5756  * Given an MDT object, try to look up the full path to the object.
5757  * Part of the MDT layer implementation of lfs fid2path.
5758  *
5759  * \param[in]     info  Per-thread common data shared by MDT level handlers.
5760  * \param[in]     obj   Object to do path lookup of
5761  * \param[in,out] fp    User-provided struct to store path information
5762  * \param[in]     root_fid Root FID of current path should reach
5763  *
5764  * \retval 0 Lookup successful, path information stored in fp
5765  * \retval -EAGAIN Lookup failed, usually because object is being moved
5766  * \retval negative errno if there was a problem
5767  */
5768 static int mdt_path_current(struct mdt_thread_info *info,
5769                             struct mdt_object *obj,
5770                             struct getinfo_fid2path *fp,
5771                             struct lu_fid *root_fid)
5772 {
5773         struct mdt_device       *mdt = info->mti_mdt;
5774         struct mdt_object       *mdt_obj;
5775         struct link_ea_header   *leh;
5776         struct link_ea_entry    *lee;
5777         struct lu_name          *tmpname = &info->mti_name;
5778         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5779         struct lu_buf           *buf = &info->mti_big_buf;
5780         char                    *ptr;
5781         int                     reclen;
5782         struct linkea_data      ldata = { NULL };
5783         int                     rc = 0;
5784         bool                    first = true;
5785         ENTRY;
5786
5787         /* temp buffer for path element, the buffer will be finally freed
5788          * in mdt_thread_info_fini */
5789         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5790         if (buf->lb_buf == NULL)
5791                 RETURN(-ENOMEM);
5792
5793         ldata.ld_buf = buf;
5794         ptr = fp->gf_u.gf_path + fp->gf_pathlen - 1;
5795         *ptr = 0;
5796         --ptr;
5797         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
5798
5799         while (!lu_fid_eq(root_fid, &fp->gf_fid)) {
5800                 struct lu_buf           lmv_buf;
5801
5802                 if (!lu_fid_eq(root_fid, &mdt->mdt_md_root_fid) &&
5803                     lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid))
5804                         GOTO(out, rc = -ENOENT);
5805
5806                 if (lu_fid_eq(mdt_object_fid(obj), tmpfid)) {
5807                         mdt_obj = obj;
5808                         mdt_object_get(info->mti_env, mdt_obj);
5809                 } else {
5810                         mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
5811                         if (IS_ERR(mdt_obj))
5812                                 GOTO(out, rc = PTR_ERR(mdt_obj));
5813                 }
5814
5815                 if (!mdt_object_exists(mdt_obj)) {
5816                         mdt_object_put(info->mti_env, mdt_obj);
5817                         GOTO(out, rc = -ENOENT);
5818                 }
5819
5820                 if (mdt_object_remote(mdt_obj)) {
5821                         mdt_object_put(info->mti_env, mdt_obj);
5822                         GOTO(remote_out, rc = -EREMOTE);
5823                 }
5824
5825                 rc = mdt_links_read(info, mdt_obj, &ldata);
5826                 if (rc != 0) {
5827                         mdt_object_put(info->mti_env, mdt_obj);
5828                         GOTO(out, rc);
5829                 }
5830
5831                 leh = buf->lb_buf;
5832                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5833                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5834                 /* If set, use link #linkno for path lookup, otherwise use
5835                    link #0.  Only do this for the final path element. */
5836                 if (first && fp->gf_linkno < leh->leh_reccount) {
5837                         int count;
5838                         for (count = 0; count < fp->gf_linkno; count++) {
5839                                 lee = (struct link_ea_entry *)
5840                                      ((char *)lee + reclen);
5841                                 linkea_entry_unpack(lee, &reclen, tmpname,
5842                                                     tmpfid);
5843                         }
5844                         if (fp->gf_linkno < leh->leh_reccount - 1)
5845                                 /* indicate to user there are more links */
5846                                 fp->gf_linkno++;
5847                 }
5848
5849                 lmv_buf.lb_buf = info->mti_xattr_buf;
5850                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
5851                 /* Check if it is slave stripes */
5852                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5853                                   &lmv_buf, XATTR_NAME_LMV);
5854                 mdt_object_put(info->mti_env, mdt_obj);
5855                 if (rc > 0) {
5856                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
5857
5858                         /* For slave stripes, get its master */
5859                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
5860                                 fp->gf_fid = *tmpfid;
5861                                 continue;
5862                         }
5863                 } else if (rc < 0 && rc != -ENODATA) {
5864                         GOTO(out, rc);
5865                 }
5866
5867                 rc = 0;
5868
5869                 /* Pack the name in the end of the buffer */
5870                 ptr -= tmpname->ln_namelen;
5871                 if (ptr - 1 <= fp->gf_u.gf_path)
5872                         GOTO(out, rc = -EOVERFLOW);
5873                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5874                 *(--ptr) = '/';
5875
5876                 /* keep the last resolved fid to the client, so the
5877                  * client will build the left path on another MDT for
5878                  * remote object */
5879                 fp->gf_fid = *tmpfid;
5880
5881                 first = false;
5882         }
5883
5884 remote_out:
5885         ptr++; /* skip leading / */
5886         memmove(fp->gf_u.gf_path, ptr,
5887                 fp->gf_u.gf_path + fp->gf_pathlen - ptr);
5888
5889 out:
5890         RETURN(rc);
5891 }
5892
5893 /**
5894  * Given an MDT object, use mdt_path_current to get the path.
5895  * Essentially a wrapper to retry mdt_path_current a set number of times
5896  * if -EAGAIN is returned (usually because an object is being moved).
5897  *
5898  * Part of the MDT layer implementation of lfs fid2path.
5899  *
5900  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5901  * \param[in]     obj   Object to do path lookup of
5902  * \param[in,out] fp    User-provided struct for arguments and to store path
5903  *                      information
5904  *
5905  * \retval 0 Lookup successful, path information stored in fp
5906  * \retval negative errno if there was a problem
5907  */
5908 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5909                     struct getinfo_fid2path *fp, struct lu_fid *root_fid)
5910 {
5911         struct mdt_device       *mdt = info->mti_mdt;
5912         int                     tries = 3;
5913         int                     rc = -EAGAIN;
5914         ENTRY;
5915
5916         if (fp->gf_pathlen < 3)
5917                 RETURN(-EOVERFLOW);
5918
5919         if (root_fid == NULL)
5920                 root_fid = &mdt->mdt_md_root_fid;
5921
5922         if (lu_fid_eq(root_fid, mdt_object_fid(obj))) {
5923                 fp->gf_u.gf_path[0] = '\0';
5924                 RETURN(0);
5925         }
5926
5927         /* Retry multiple times in case file is being moved */
5928         while (tries-- && rc == -EAGAIN)
5929                 rc = mdt_path_current(info, obj, fp, root_fid);
5930
5931         RETURN(rc);
5932 }
5933
5934 /**
5935  * Get the full path of the provided FID, as of changelog record recno.
5936  *
5937  * This checks sanity and looks up object for user provided FID
5938  * before calling the actual path lookup code.
5939  *
5940  * Part of the MDT layer implementation of lfs fid2path.
5941  *
5942  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5943  * \param[in,out] fp    User-provided struct for arguments and to store path
5944  *                      information
5945  *
5946  * \retval 0 Lookup successful, path information and recno stored in fp
5947  * \retval -ENOENT, object does not exist
5948  * \retval negative errno if there was a problem
5949  */
5950 static int mdt_fid2path(struct mdt_thread_info *info,
5951                         struct lu_fid *root_fid,
5952                         struct getinfo_fid2path *fp)
5953 {
5954         struct mdt_device *mdt = info->mti_mdt;
5955         struct mdt_object *obj;
5956         int    rc;
5957         ENTRY;
5958
5959         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
5960                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5961
5962         if (!fid_is_sane(&fp->gf_fid))
5963                 RETURN(-EINVAL);
5964
5965         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5966                 CDEBUG(D_INFO, "%s: "DFID" is invalid, f_seq should be >= %#llx"
5967                        ", or f_oid != 0, or f_ver == 0\n", mdt_obd_name(mdt),
5968                        PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5969                 RETURN(-EINVAL);
5970         }
5971
5972         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5973         if (IS_ERR(obj)) {
5974                 rc = PTR_ERR(obj);
5975                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
5976                        PFID(&fp->gf_fid), rc);
5977                 RETURN(rc);
5978         }
5979
5980         if (mdt_object_remote(obj))
5981                 rc = -EREMOTE;
5982         else if (!mdt_object_exists(obj))
5983                 rc = -ENOENT;
5984         else
5985                 rc = 0;
5986
5987         if (rc < 0) {
5988                 mdt_object_put(info->mti_env, obj);
5989                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
5990                        PFID(&fp->gf_fid), rc);
5991                 RETURN(rc);
5992         }
5993
5994         rc = mdt_path(info, obj, fp, root_fid);
5995
5996         CDEBUG(D_INFO, "fid "DFID", path %s recno %#llx linkno %u\n",
5997                PFID(&fp->gf_fid), fp->gf_u.gf_path,
5998                fp->gf_recno, fp->gf_linkno);
5999
6000         mdt_object_put(info->mti_env, obj);
6001
6002         RETURN(rc);
6003 }
6004
6005 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key, int keylen,
6006                             void *val, int vallen)
6007 {
6008         struct getinfo_fid2path *fpout, *fpin;
6009         struct lu_fid *root_fid = NULL;
6010         int rc = 0;
6011
6012         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
6013         fpout = val;
6014
6015         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
6016                 lustre_swab_fid2path(fpin);
6017
6018         memcpy(fpout, fpin, sizeof(*fpin));
6019         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
6020                 RETURN(-EINVAL);
6021
6022         if (keylen >= cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*fpin) +
6023                       sizeof(struct lu_fid)) {
6024                 /* client sent its root FID, which is normally fileset FID */
6025                 root_fid = fpin->gf_u.gf_root_fid;
6026                 if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
6027                         lustre_swab_lu_fid(root_fid);
6028
6029                 if (root_fid != NULL && !fid_is_sane(root_fid))
6030                         RETURN(-EINVAL);
6031         }
6032
6033         rc = mdt_fid2path(info, root_fid, fpout);
6034         RETURN(rc);
6035 }
6036
6037 int mdt_get_info(struct tgt_session_info *tsi)
6038 {
6039         char    *key;
6040         int      keylen;
6041         __u32   *vallen;
6042         void    *valout;
6043         int      rc;
6044
6045         ENTRY;
6046
6047         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
6048         if (key == NULL) {
6049                 CDEBUG(D_IOCTL, "No GETINFO key\n");
6050                 RETURN(err_serious(-EFAULT));
6051         }
6052         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
6053                                       RCL_CLIENT);
6054
6055         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
6056         if (vallen == NULL) {
6057                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
6058                                 tgt_name(tsi->tsi_tgt));
6059                 RETURN(err_serious(-EFAULT));
6060         }
6061
6062         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
6063                              *vallen);
6064         rc = req_capsule_server_pack(tsi->tsi_pill);
6065         if (rc)
6066                 RETURN(err_serious(rc));
6067
6068         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
6069         if (valout == NULL) {
6070                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
6071                                 tgt_name(tsi->tsi_tgt));
6072                 RETURN(err_serious(-EFAULT));
6073         }
6074
6075         if (KEY_IS(KEY_FID2PATH)) {
6076                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
6077
6078                 rc = mdt_rpc_fid2path(info, key, keylen, valout, *vallen);
6079                 mdt_thread_info_fini(info);
6080         } else {
6081                 rc = -EINVAL;
6082         }
6083         RETURN(rc);
6084 }
6085
6086 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
6087 {
6088         struct obd_ioctl_data *data = karg;
6089         struct lu_fid *fid;
6090         __u64 version;
6091         struct mdt_object *obj;
6092         struct mdt_lock_handle  *lh;
6093         int rc;
6094         ENTRY;
6095
6096         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
6097             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
6098                 RETURN(-EINVAL);
6099
6100         fid = (struct lu_fid *)data->ioc_inlbuf1;
6101
6102         if (!fid_is_sane(fid))
6103                 RETURN(-EINVAL);
6104
6105         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
6106
6107         lh = &mti->mti_lh[MDT_LH_PARENT];
6108         mdt_lock_reg_init(lh, LCK_CR);
6109
6110         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
6111         if (IS_ERR(obj))
6112                 RETURN(PTR_ERR(obj));
6113
6114         if (mdt_object_remote(obj)) {
6115                 rc = -EREMOTE;
6116                 /**
6117                  * before calling version get the correct MDS should be
6118                  * fid, this is error to find remote object here
6119                  */
6120                 CERROR("nonlocal object "DFID"\n", PFID(fid));
6121         } else if (!mdt_object_exists(obj)) {
6122                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
6123                 rc = -ENOENT;
6124         } else {
6125                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
6126                *(__u64 *)data->ioc_inlbuf2 = version;
6127                 rc = 0;
6128         }
6129         mdt_object_unlock_put(mti, obj, lh, 1);
6130         RETURN(rc);
6131 }
6132
6133 /* ioctls on obd dev */
6134 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
6135                          void *karg, void __user *uarg)
6136 {
6137         struct lu_env      env;
6138         struct obd_device *obd = exp->exp_obd;
6139         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
6140         struct dt_device  *dt = mdt->mdt_bottom;
6141         int rc;
6142
6143         ENTRY;
6144         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
6145         rc = lu_env_init(&env, LCT_MD_THREAD);
6146         if (rc)
6147                 RETURN(rc);
6148
6149         switch (cmd) {
6150         case OBD_IOC_SYNC:
6151                 rc = mdt_device_sync(&env, mdt);
6152                 break;
6153         case OBD_IOC_SET_READONLY:
6154                 rc = dt_sync(&env, dt);
6155                 if (rc == 0)
6156                         rc = dt_ro(&env, dt);
6157                 break;
6158         case OBD_IOC_ABORT_RECOVERY:
6159                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
6160                 obd->obd_abort_recovery = 1;
6161                 target_stop_recovery_thread(obd);
6162                 rc = 0;
6163                 break;
6164         case OBD_IOC_CHANGELOG_REG:
6165         case OBD_IOC_CHANGELOG_DEREG:
6166         case OBD_IOC_CHANGELOG_CLEAR:
6167                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(&env,
6168                                                            mdt->mdt_child,
6169                                                            cmd, len, karg);
6170                 break;
6171         case OBD_IOC_START_LFSCK: {
6172                 struct md_device *next = mdt->mdt_child;
6173                 struct obd_ioctl_data *data = karg;
6174                 struct lfsck_start_param lsp;
6175
6176                 if (unlikely(data == NULL)) {
6177                         rc = -EINVAL;
6178                         break;
6179                 }
6180
6181                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
6182                 lsp.lsp_index_valid = 0;
6183                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
6184                 break;
6185         }
6186         case OBD_IOC_STOP_LFSCK: {
6187                 struct md_device        *next = mdt->mdt_child;
6188                 struct obd_ioctl_data   *data = karg;
6189                 struct lfsck_stop        stop;
6190
6191                 stop.ls_status = LS_STOPPED;
6192                 /* Old lfsck utils may pass NULL @stop. */
6193                 if (data->ioc_inlbuf1 == NULL)
6194                         stop.ls_flags = 0;
6195                 else
6196                         stop.ls_flags =
6197                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
6198
6199                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
6200                 break;
6201         }
6202         case OBD_IOC_QUERY_LFSCK: {
6203                 struct md_device        *next = mdt->mdt_child;
6204                 struct obd_ioctl_data   *data = karg;
6205
6206                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0,
6207                                                  data->ioc_inlbuf1);
6208                 break;
6209         }
6210         case OBD_IOC_GET_OBJ_VERSION: {
6211                 struct mdt_thread_info *mti;
6212                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6213                 memset(mti, 0, sizeof *mti);
6214                 mti->mti_env = &env;
6215                 mti->mti_mdt = mdt;
6216                 mti->mti_exp = exp;
6217
6218                 rc = mdt_ioc_version_get(mti, karg);
6219                 break;
6220         }
6221         case OBD_IOC_CATLOGLIST: {
6222                 struct mdt_thread_info *mti;
6223
6224                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6225                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
6226                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
6227                                        &mti->mti_tmp_fid1);
6228                 break;
6229          }
6230         default:
6231                 rc = -EOPNOTSUPP;
6232                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
6233                         mdt_obd_name(mdt), cmd, rc);
6234         }
6235
6236         lu_env_fini(&env);
6237         RETURN(rc);
6238 }
6239
6240 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
6241 {
6242         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
6243         int rc;
6244         ENTRY;
6245
6246         if (!mdt->mdt_skip_lfsck && !mdt->mdt_bottom->dd_rdonly) {
6247                 struct lfsck_start_param lsp;
6248
6249                 lsp.lsp_start = NULL;
6250                 lsp.lsp_index_valid = 0;
6251                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
6252                                                            OBD_IOC_START_LFSCK,
6253                                                            0, &lsp);
6254                 if (rc != 0 && rc != -EALREADY)
6255                         CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
6256                               mdt_obd_name(mdt), rc);
6257         }
6258
6259         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
6260         RETURN(rc);
6261 }
6262
6263 static int mdt_obd_postrecov(struct obd_device *obd)
6264 {
6265         struct lu_env env;
6266         int rc;
6267
6268         rc = lu_env_init(&env, LCT_MD_THREAD);
6269         if (rc)
6270                 RETURN(rc);
6271         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
6272         lu_env_fini(&env);
6273         return rc;
6274 }
6275
6276 static struct obd_ops mdt_obd_device_ops = {
6277         .o_owner          = THIS_MODULE,
6278         .o_set_info_async = mdt_obd_set_info_async,
6279         .o_connect        = mdt_obd_connect,
6280         .o_reconnect      = mdt_obd_reconnect,
6281         .o_disconnect     = mdt_obd_disconnect,
6282         .o_init_export    = mdt_init_export,
6283         .o_destroy_export = mdt_destroy_export,
6284         .o_iocontrol      = mdt_iocontrol,
6285         .o_postrecov      = mdt_obd_postrecov,
6286 };
6287
6288 static struct lu_device* mdt_device_fini(const struct lu_env *env,
6289                                          struct lu_device *d)
6290 {
6291         struct mdt_device *m = mdt_dev(d);
6292         ENTRY;
6293
6294         mdt_fini(env, m);
6295         RETURN(NULL);
6296 }
6297
6298 static struct lu_device *mdt_device_free(const struct lu_env *env,
6299                                          struct lu_device *d)
6300 {
6301         struct mdt_device *m = mdt_dev(d);
6302         ENTRY;
6303
6304         lu_device_fini(&m->mdt_lu_dev);
6305         OBD_FREE_PTR(m);
6306
6307         RETURN(NULL);
6308 }
6309
6310 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
6311                                           struct lu_device_type *t,
6312                                           struct lustre_cfg *cfg)
6313 {
6314         struct lu_device  *l;
6315         struct mdt_device *m;
6316
6317         OBD_ALLOC_PTR(m);
6318         if (m != NULL) {
6319                 int rc;
6320
6321                 l = &m->mdt_lu_dev;
6322                 rc = mdt_init0(env, m, t, cfg);
6323                 if (rc != 0) {
6324                         mdt_device_free(env, l);
6325                         l = ERR_PTR(rc);
6326                         return l;
6327                 }
6328         } else
6329                 l = ERR_PTR(-ENOMEM);
6330         return l;
6331 }
6332
6333 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
6334 LU_KEY_INIT(mdt, struct mdt_thread_info);
6335
6336 static void mdt_key_fini(const struct lu_context *ctx,
6337                          struct lu_context_key *key, void* data)
6338 {
6339         struct mdt_thread_info *info = data;
6340
6341         if (info->mti_big_lmm) {
6342                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
6343                 info->mti_big_lmm = NULL;
6344                 info->mti_big_lmmsize = 0;
6345         }
6346
6347         if (info->mti_big_acl) {
6348                 OBD_FREE_LARGE(info->mti_big_acl, info->mti_big_aclsize);
6349                 info->mti_big_acl = NULL;
6350                 info->mti_big_aclsize = 0;
6351         }
6352
6353         OBD_FREE_PTR(info);
6354 }
6355
6356 /* context key: mdt_thread_key */
6357 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
6358
6359 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
6360 {
6361         return lu_ucred(info->mti_env);
6362 }
6363
6364 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
6365 {
6366         return lu_ucred_check(info->mti_env);
6367 }
6368
6369 /**
6370  * Enable/disable COS (Commit On Sharing).
6371  *
6372  * Set/Clear the COS flag in mdt options.
6373  *
6374  * \param mdt mdt device
6375  * \param val 0 disables COS, other values enable COS
6376  */
6377 void mdt_enable_cos(struct mdt_device *mdt, int val)
6378 {
6379         struct lu_env env;
6380         int rc;
6381
6382         mdt->mdt_opts.mo_cos = !!val;
6383         rc = lu_env_init(&env, LCT_LOCAL);
6384         if (unlikely(rc != 0)) {
6385                 CWARN("%s: lu_env initialization failed, cannot "
6386                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
6387                 return;
6388         }
6389         mdt_device_sync(&env, mdt);
6390         lu_env_fini(&env);
6391 }
6392
6393 /**
6394  * Check COS (Commit On Sharing) status.
6395  *
6396  * Return COS flag status.
6397  *
6398  * \param mdt mdt device
6399  */
6400 int mdt_cos_is_enabled(struct mdt_device *mdt)
6401 {
6402         return mdt->mdt_opts.mo_cos != 0;
6403 }
6404
6405 static struct lu_device_type_operations mdt_device_type_ops = {
6406         .ldto_device_alloc = mdt_device_alloc,
6407         .ldto_device_free  = mdt_device_free,
6408         .ldto_device_fini  = mdt_device_fini
6409 };
6410
6411 static struct lu_device_type mdt_device_type = {
6412         .ldt_tags     = LU_DEVICE_MD,
6413         .ldt_name     = LUSTRE_MDT_NAME,
6414         .ldt_ops      = &mdt_device_type_ops,
6415         .ldt_ctx_tags = LCT_MD_THREAD
6416 };
6417
6418 static int __init mdt_init(void)
6419 {
6420         int rc;
6421
6422         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
6423                  FID_NOBRACE_LEN + 1);
6424         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
6425                  FID_LEN + 1);
6426         rc = lu_kmem_init(mdt_caches);
6427         if (rc)
6428                 return rc;
6429
6430         rc = mds_mod_init();
6431         if (rc)
6432                 GOTO(lu_fini, rc);
6433
6434         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
6435                                  LUSTRE_MDT_NAME, &mdt_device_type);
6436         if (rc)
6437                 GOTO(mds_fini, rc);
6438 lu_fini:
6439         if (rc)
6440                 lu_kmem_fini(mdt_caches);
6441 mds_fini:
6442         if (rc)
6443                 mds_mod_exit();
6444         return rc;
6445 }
6446
6447 static void __exit mdt_exit(void)
6448 {
6449         class_unregister_type(LUSTRE_MDT_NAME);
6450         mds_mod_exit();
6451         lu_kmem_fini(mdt_caches);
6452 }
6453
6454 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
6455 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
6456 MODULE_VERSION(LUSTRE_VERSION_STRING);
6457 MODULE_LICENSE("GPL");
6458
6459 module_init(mdt_init);
6460 module_exit(mdt_exit);