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, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/mdt/mdt_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/lustre_ioctl.h>
  54 #include <lustre_lfsck.h>
  55 #include <lustre_log.h>
  56 #include <lustre_nodemap.h>
  57 #include <lustre_mds.h>
  58 #include <uapi/linux/lustre/lustre_param.h>
  59 #include <lustre_quota.h>
  60 #include <lustre_swab.h>
  61 #include <obd.h>
  62 #include <obd_support.h>
  63 #include <lustre_barrier.h>
  64 #include <obd_cksum.h>
  65 #include <llog_swab.h>
  66
  67 #include "mdt_internal.h"
  68
  69
  70 static unsigned int max_mod_rpcs_per_client = 8;
  71 module_param(max_mod_rpcs_per_client, uint, 0644);
  72 MODULE_PARM_DESC(max_mod_rpcs_per_client, "maximum number of modify RPCs in flight allowed per client");
  73
  74 mdl_mode_t mdt_mdl_lock_modes[] = {
  75         [LCK_MINMODE] = MDL_MINMODE,
  76         [LCK_EX]      = MDL_EX,
  77         [LCK_PW]      = MDL_PW,
  78         [LCK_PR]      = MDL_PR,
  79         [LCK_CW]      = MDL_CW,
  80         [LCK_CR]      = MDL_CR,
  81         [LCK_NL]      = MDL_NL,
  82         [LCK_GROUP]   = MDL_GROUP
  83 };
  84
  85 enum ldlm_mode mdt_dlm_lock_modes[] = {
  86         [MDL_MINMODE]   = LCK_MINMODE,
  87         [MDL_EX]        = LCK_EX,
  88         [MDL_PW]        = LCK_PW,
  89         [MDL_PR]        = LCK_PR,
  90         [MDL_CW]        = LCK_CW,
  91         [MDL_CR]        = LCK_CR,
  92         [MDL_NL]        = LCK_NL,
  93         [MDL_GROUP]     = LCK_GROUP
  94 };
  95
  96 static struct mdt_device *mdt_dev(struct lu_device *d);
  97 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
  98
  99 static const struct lu_object_operations mdt_obj_ops;
 100
 101 /* Slab for MDT object allocation */
 102 static struct kmem_cache *mdt_object_kmem;
 103
 104 /* For HSM restore handles */
 105 struct kmem_cache *mdt_hsm_cdt_kmem;
 106
 107 /* For HSM request handles */
 108 struct kmem_cache *mdt_hsm_car_kmem;
 109
 110 static struct lu_kmem_descr mdt_caches[] = {
 111         {
 112                 .ckd_cache = &mdt_object_kmem,
 113                 .ckd_name  = "mdt_obj",
 114                 .ckd_size  = sizeof(struct mdt_object)
 115         },
 116         {
 117                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 118                 .ckd_name       = "mdt_cdt_restore_handle",
 119                 .ckd_size       = sizeof(struct cdt_restore_handle)
 120         },
 121         {
 122                 .ckd_cache      = &mdt_hsm_car_kmem,
 123                 .ckd_name       = "mdt_cdt_agent_req",
 124                 .ckd_size       = sizeof(struct cdt_agent_req)
 125         },
 126         {
 127                 .ckd_cache = NULL
 128         }
 129 };
 130
 131 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 132 {
 133         if (!rep)
 134                 return 0;
 135         return rep->lock_policy_res1 & op_flag;
 136 }
 137
 138 void mdt_clear_disposition(struct mdt_thread_info *info,
 139                            struct ldlm_reply *rep, __u64 op_flag)
 140 {
 141         if (info) {
 142                 info->mti_opdata &= ~op_flag;
 143                 tgt_opdata_clear(info->mti_env, op_flag);
 144         }
 145         if (rep)
 146                 rep->lock_policy_res1 &= ~op_flag;
 147 }
 148
 149 void mdt_set_disposition(struct mdt_thread_info *info,
 150                          struct ldlm_reply *rep, __u64 op_flag)
 151 {
 152         if (info) {
 153                 info->mti_opdata |= op_flag;
 154                 tgt_opdata_set(info->mti_env, op_flag);
 155         }
 156         if (rep)
 157                 rep->lock_policy_res1 |= op_flag;
 158 }
 159
 160 void mdt_lock_reg_init(struct mdt_lock_handle *lh, enum ldlm_mode lm)
 161 {
 162         lh->mlh_pdo_hash = 0;
 163         lh->mlh_reg_mode = lm;
 164         lh->mlh_rreg_mode = lm;
 165         lh->mlh_type = MDT_REG_LOCK;
 166 }
 167
 168 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, enum ldlm_mode lock_mode,
 169                        const struct lu_name *lname)
 170 {
 171         lh->mlh_reg_mode = lock_mode;
 172         lh->mlh_pdo_mode = LCK_MINMODE;
 173         lh->mlh_rreg_mode = lock_mode;
 174         lh->mlh_type = MDT_PDO_LOCK;
 175
 176         if (lu_name_is_valid(lname)) {
 177                 lh->mlh_pdo_hash = ll_full_name_hash(NULL, lname->ln_name,
 178                                                      lname->ln_namelen);
 179                 /* XXX Workaround for LU-2856
 180                  *
 181                  * Zero is a valid return value of full_name_hash, but
 182                  * several users of mlh_pdo_hash assume a non-zero
 183                  * hash value. We therefore map zero onto an
 184                  * arbitrary, but consistent value (1) to avoid
 185                  * problems further down the road. */
 186                 if (unlikely(lh->mlh_pdo_hash == 0))
 187                         lh->mlh_pdo_hash = 1;
 188         } else {
 189                 lh->mlh_pdo_hash = 0;
 190         }
 191 }
 192
 193 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 194                               struct mdt_lock_handle *lh)
 195 {
 196         mdl_mode_t mode;
 197         ENTRY;
 198
 199         /*
 200          * Any dir access needs couple of locks:
 201          *
 202          * 1) on part of dir we gonna take lookup/modify;
 203          *
 204          * 2) on whole dir to protect it from concurrent splitting and/or to
 205          * flush client's cache for readdir().
 206          *
 207          * so, for a given mode and object this routine decides what lock mode
 208          * to use for lock #2:
 209          *
 210          * 1) if caller's gonna lookup in dir then we need to protect dir from
 211          * being splitted only - LCK_CR
 212          *
 213          * 2) if caller's gonna modify dir then we need to protect dir from
 214          * being splitted and to flush cache - LCK_CW
 215          *
 216          * 3) if caller's gonna modify dir and that dir seems ready for
 217          * splitting then we need to protect it from any type of access
 218          * (lookup/modify/split) - LCK_EX --bzzz
 219          */
 220
 221         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 222         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 223
 224         /*
 225          * Ask underlaying level its opinion about preferable PDO lock mode
 226          * having access type passed as regular lock mode:
 227          *
 228          * - MDL_MINMODE means that lower layer does not want to specify lock
 229          * mode;
 230          *
 231          * - MDL_NL means that no PDO lock should be taken. This is used in some
 232          * cases. Say, for non-splittable directories no need to use PDO locks
 233          * at all.
 234          */
 235         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 236                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 237
 238         if (mode != MDL_MINMODE) {
 239                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 240         } else {
 241                 /*
 242                  * Lower layer does not want to specify locking mode. We do it
 243                  * our selves. No special protection is needed, just flush
 244                  * client's cache on modification and allow concurrent
 245                  * mondification.
 246                  */
 247                 switch (lh->mlh_reg_mode) {
 248                 case LCK_EX:
 249                         lh->mlh_pdo_mode = LCK_EX;
 250                         break;
 251                 case LCK_PR:
 252                         lh->mlh_pdo_mode = LCK_CR;
 253                         break;
 254                 case LCK_PW:
 255                         lh->mlh_pdo_mode = LCK_CW;
 256                         break;
 257                 default:
 258                         CERROR("Not expected lock type (0x%x)\n",
 259                                (int)lh->mlh_reg_mode);
 260                         LBUG();
 261                 }
 262         }
 263
 264         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 265         EXIT;
 266 }
 267
 268 static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
 269                               struct lu_fid *fid)
 270 {
 271         struct mdt_device *mdt = info->mti_mdt;
 272         struct lu_name *lname = &info->mti_name;
 273         char *name = NULL;
 274         struct mdt_object *parent;
 275         u32 mode;
 276         int rc = 0;
 277
 278         LASSERT(!info->mti_cross_ref);
 279
 280         OBD_ALLOC(name, NAME_MAX + 1);
 281         if (name == NULL)
 282                 return -ENOMEM;
 283         lname->ln_name = name;
 284
 285         /*
 286          * We may want to allow this to mount a completely separate
 287          * fileset from the MDT in the future, but keeping it to
 288          * ROOT/ only for now avoid potential security issues.
 289          */
 290         *fid = mdt->mdt_md_root_fid;
 291
 292         while (rc == 0 && fileset != NULL && *fileset != '\0') {
 293                 const char *s1 = fileset;
 294                 const char *s2;
 295
 296                 while (*++s1 == '/')
 297                         ;
 298                 s2 = s1;
 299                 while (*s2 != '/' && *s2 != '\0')
 300                         s2++;
 301
 302                 if (s2 == s1)
 303                         break;
 304
 305                 fileset = s2;
 306
 307                 lname->ln_namelen = s2 - s1;
 308                 if (lname->ln_namelen > NAME_MAX) {
 309                         rc = -EINVAL;
 310                         break;
 311                 }
 312
 313                 /* reject .. as a path component */
 314                 if (lname->ln_namelen == 2 &&
 315                     strncmp(s1, "..", 2) == 0) {
 316                         rc = -EINVAL;
 317                         break;
 318                 }
 319
 320                 strncpy(name, s1, lname->ln_namelen);
 321                 name[lname->ln_namelen] = '\0';
 322
 323                 parent = mdt_object_find(info->mti_env, mdt, fid);
 324                 if (IS_ERR(parent)) {
 325                         rc = PTR_ERR(parent);
 326                         break;
 327                 }
 328                 /* Only got the fid of this obj by name */
 329                 fid_zero(fid);
 330                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
 331                                 fid, &info->mti_spec);
 332                 mdt_object_put(info->mti_env, parent);
 333         }
 334         if (!rc) {
 335                 parent = mdt_object_find(info->mti_env, mdt, fid);
 336                 if (IS_ERR(parent))
 337                         rc = PTR_ERR(parent);
 338                 else {
 339                         mode = lu_object_attr(&parent->mot_obj);
 340                         mdt_object_put(info->mti_env, parent);
 341                         if (!S_ISDIR(mode))
 342                                 rc = -ENOTDIR;
 343                 }
 344         }
 345
 346         OBD_FREE(name, NAME_MAX + 1);
 347
 348         return rc;
 349 }
 350
 351 static int mdt_get_root(struct tgt_session_info *tsi)
 352 {
 353         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 354         struct mdt_device       *mdt = info->mti_mdt;
 355         struct mdt_body         *repbody;
 356         char                    *fileset = NULL, *buffer = NULL;
 357         int                      rc;
 358         struct obd_export       *exp = info->mti_exp;
 359         char                    *nodemap_fileset;
 360
 361         ENTRY;
 362
 363         rc = mdt_check_ucred(info);
 364         if (rc)
 365                 GOTO(out, rc = err_serious(rc));
 366
 367         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GET_ROOT_PACK))
 368                 GOTO(out, rc = err_serious(-ENOMEM));
 369
 370         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 371         if (req_capsule_get_size(info->mti_pill, &RMF_NAME, RCL_CLIENT) > 0) {
 372                 fileset = req_capsule_client_get(info->mti_pill, &RMF_NAME);
 373                 if (fileset == NULL)
 374                         GOTO(out, rc = err_serious(-EFAULT));
 375         }
 376
 377         nodemap_fileset = nodemap_get_fileset(exp->exp_target_data.ted_nodemap);
 378         if (nodemap_fileset && nodemap_fileset[0]) {
 379                 CDEBUG(D_INFO, "nodemap fileset is %s\n", nodemap_fileset);
 380                 if (fileset) {
 381                         /* consider fileset from client as a sub-fileset
 382                          * of the nodemap one */
 383                         OBD_ALLOC(buffer, PATH_MAX + 1);
 384                         if (buffer == NULL)
 385                                 GOTO(out, rc = err_serious(-ENOMEM));
 386                         if (snprintf(buffer, PATH_MAX + 1, "%s/%s",
 387                                      nodemap_fileset, fileset) >= PATH_MAX + 1)
 388                                 GOTO(out, rc = err_serious(-EINVAL));
 389                         fileset = buffer;
 390                 } else {
 391                         /* enforce fileset as specified in the nodemap */
 392                         fileset = nodemap_fileset;
 393                 }
 394         }
 395
 396         if (fileset) {
 397                 CDEBUG(D_INFO, "Getting fileset %s\n", fileset);
 398                 rc = mdt_lookup_fileset(info, fileset, &repbody->mbo_fid1);
 399                 if (rc < 0)
 400                         GOTO(out, rc = err_serious(rc));
 401         } else {
 402                 repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 403         }
 404         repbody->mbo_valid |= OBD_MD_FLID;
 405
 406         EXIT;
 407 out:
 408         mdt_thread_info_fini(info);
 409         if (buffer)
 410                 OBD_FREE(buffer, PATH_MAX+1);
 411         return rc;
 412 }
 413
 414 static int mdt_statfs(struct tgt_session_info *tsi)
 415 {
 416         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 417         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 418         struct mdt_device               *mdt = info->mti_mdt;
 419         struct tg_grants_data           *tgd = &mdt->mdt_lut.lut_tgd;
 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         rc = tgt_statfs_internal(tsi->tsi_env, &mdt->mdt_lut, osfs,
 445                                  ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 446                                  NULL);
 447         if (unlikely(rc))
 448                 GOTO(out, rc);
 449
 450         /* at least try to account for cached pages.  its still racy and
 451          * might be under-reporting if clients haven't announced their
 452          * caches with brw recently */
 453         CDEBUG(D_SUPER | D_CACHE, "blocks cached %llu granted %llu"
 454                " pending %llu free %llu avail %llu\n",
 455                tgd->tgd_tot_dirty, tgd->tgd_tot_granted,
 456                tgd->tgd_tot_pending,
 457                osfs->os_bfree << tgd->tgd_blockbits,
 458                osfs->os_bavail << tgd->tgd_blockbits);
 459
 460         osfs->os_bavail -= min_t(u64, osfs->os_bavail,
 461                                  ((tgd->tgd_tot_dirty + tgd->tgd_tot_pending +
 462                                    osfs->os_bsize - 1) >> tgd->tgd_blockbits));
 463
 464         tgt_grant_sanity_check(mdt->mdt_lu_dev.ld_obd, __func__);
 465         CDEBUG(D_CACHE, "%llu blocks: %llu free, %llu avail; "
 466                "%llu objects: %llu free; state %x\n",
 467                osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
 468                osfs->os_files, osfs->os_ffree, osfs->os_state);
 469
 470         if (!exp_grant_param_supp(tsi->tsi_exp) &&
 471             tgd->tgd_blockbits > COMPAT_BSIZE_SHIFT) {
 472                 /* clients which don't support OBD_CONNECT_GRANT_PARAM
 473                  * should not see a block size > page size, otherwise
 474                  * cl_lost_grant goes mad. Therefore, we emulate a 4KB (=2^12)
 475                  * block size which is the biggest block size known to work
 476                  * with all client's page size. */
 477                 osfs->os_blocks <<= tgd->tgd_blockbits - COMPAT_BSIZE_SHIFT;
 478                 osfs->os_bfree  <<= tgd->tgd_blockbits - COMPAT_BSIZE_SHIFT;
 479                 osfs->os_bavail <<= tgd->tgd_blockbits - COMPAT_BSIZE_SHIFT;
 480                 osfs->os_bsize = 1 << COMPAT_BSIZE_SHIFT;
 481         }
 482         if (rc == 0)
 483                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 484 out:
 485         mdt_thread_info_fini(info);
 486         RETURN(rc);
 487 }
 488
 489 /**
 490  * Pack size attributes into the reply.
 491  */
 492 int mdt_pack_size2body(struct mdt_thread_info *info,
 493                         const struct lu_fid *fid, bool dom_lock)
 494 {
 495         struct mdt_body *b;
 496         struct md_attr *ma = &info->mti_attr;
 497         int dom_stripe;
 498
 499         ENTRY;
 500
 501         LASSERT(ma->ma_attr.la_valid & LA_MODE);
 502
 503         if (!S_ISREG(ma->ma_attr.la_mode) ||
 504             !(ma->ma_valid & MA_LOV && ma->ma_lmm != NULL))
 505                 RETURN(-ENODATA);
 506
 507         dom_stripe = mdt_lmm_dom_entry(ma->ma_lmm);
 508         /* no DoM stripe, no size in reply */
 509         if (dom_stripe == LMM_NO_DOM)
 510                 RETURN(-ENOENT);
 511
 512         /* no DoM lock, no size in reply */
 513         if (!dom_lock)
 514                 RETURN(0);
 515
 516         /* Either DoM lock exists or LMM has only DoM stripe then
 517          * return size on body. */
 518         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 519
 520         mdt_dom_object_size(info->mti_env, info->mti_mdt, fid, b, dom_lock);
 521         RETURN(0);
 522 }
 523
 524 #ifdef CONFIG_FS_POSIX_ACL
 525 /*
 526  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 527  *
 528  * \param       info    thread info object
 529  * \param       repbody reply to pack ACLs into
 530  * \param       o       mdt object of file to examine
 531  * \param       nodemap nodemap of client to reply to
 532  * \retval      0       success
 533  * \retval      -errno  error getting or parsing ACL from disk
 534  */
 535 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 536                       struct mdt_object *o, struct lu_nodemap *nodemap)
 537 {
 538         const struct lu_env     *env = info->mti_env;
 539         struct md_object        *next = mdt_object_child(o);
 540         struct lu_buf           *buf = &info->mti_buf;
 541         struct mdt_device       *mdt = info->mti_mdt;
 542         struct req_capsule *pill = info->mti_pill;
 543         int rc;
 544
 545         ENTRY;
 546
 547         buf->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
 548         buf->lb_len = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
 549         if (buf->lb_len == 0)
 550                 RETURN(0);
 551
 552 again:
 553         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 554         if (rc < 0) {
 555                 if (rc == -ENODATA) {
 556                         repbody->mbo_aclsize = 0;
 557                         repbody->mbo_valid |= OBD_MD_FLACL;
 558                         rc = 0;
 559                 } else if (rc == -EOPNOTSUPP) {
 560                         rc = 0;
 561                 } else {
 562                         if (rc == -ERANGE &&
 563                             exp_connect_large_acl(info->mti_exp) &&
 564                             buf->lb_buf != info->mti_big_acl) {
 565                                 if (info->mti_big_acl == NULL) {
 566                                         OBD_ALLOC_LARGE(info->mti_big_acl,
 567                                                         mdt->mdt_max_ea_size);
 568                                         if (info->mti_big_acl == NULL) {
 569                                                 CERROR("%s: unable to grow "
 570                                                        DFID" ACL buffer\n",
 571                                                        mdt_obd_name(mdt),
 572                                                        PFID(mdt_object_fid(o)));
 573                                                 RETURN(-ENOMEM);
 574                                         }
 575
 576                                         info->mti_big_aclsize =
 577                                                         mdt->mdt_max_ea_size;
 578                                 }
 579
 580                                 CDEBUG(D_INODE, "%s: grow the "DFID
 581                                        " ACL buffer to size %d\n",
 582                                        mdt_obd_name(mdt),
 583                                        PFID(mdt_object_fid(o)),
 584                                        mdt->mdt_max_ea_size);
 585
 586                                 buf->lb_buf = info->mti_big_acl;
 587                                 buf->lb_len = info->mti_big_aclsize;
 588
 589                                 goto again;
 590                         }
 591
 592                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 593                                mdt_obd_name(mdt), PFID(mdt_object_fid(o)), rc);
 594                 }
 595         } else {
 596                 int client;
 597                 int server;
 598                 int acl_buflen;
 599                 int lmm_buflen = 0;
 600                 int lmmsize = 0;
 601
 602                 acl_buflen = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
 603                 if (acl_buflen >= rc)
 604                         goto map;
 605
 606                 /* If LOV/LMA EA is small, we can reuse part of their buffer */
 607                 client = ptlrpc_req_get_repsize(pill->rc_req);
 608                 server = lustre_packed_msg_size(pill->rc_req->rq_repmsg);
 609                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER)) {
 610                         lmm_buflen = req_capsule_get_size(pill, &RMF_MDT_MD,
 611                                                           RCL_SERVER);
 612                         lmmsize = repbody->mbo_eadatasize;
 613                 }
 614
 615                 if (client < server - acl_buflen - lmm_buflen + rc + lmmsize) {
 616                         CDEBUG(D_INODE, "%s: client prepared buffer size %d "
 617                                "is not big enough with the ACL size %d (%d)\n",
 618                                mdt_obd_name(mdt), client, rc,
 619                                server - acl_buflen - lmm_buflen + rc + lmmsize);
 620                         repbody->mbo_aclsize = 0;
 621                         repbody->mbo_valid &= ~OBD_MD_FLACL;
 622                         RETURN(-ERANGE);
 623                 }
 624
 625 map:
 626                 if (buf->lb_buf == info->mti_big_acl)
 627                         info->mti_big_acl_used = 1;
 628
 629                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 630                                      rc, NODEMAP_FS_TO_CLIENT);
 631                 /* if all ACLs mapped out, rc is still >= 0 */
 632                 if (rc < 0) {
 633                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 634                                " ACL: rc = %d\n", mdt_obd_name(mdt),
 635                                PFID(mdt_object_fid(o)), rc);
 636                         repbody->mbo_aclsize = 0;
 637                         repbody->mbo_valid &= ~OBD_MD_FLACL;
 638                 } else {
 639                         repbody->mbo_aclsize = rc;
 640                         repbody->mbo_valid |= OBD_MD_FLACL;
 641                         rc = 0;
 642                 }
 643         }
 644
 645         RETURN(rc);
 646 }
 647 #endif
 648
 649 /* XXX Look into layout in MDT layer. */
 650 static inline bool mdt_hsm_is_released(struct lov_mds_md *lmm)
 651 {
 652         struct lov_comp_md_v1   *comp_v1;
 653         struct lov_mds_md       *v1;
 654         int                      i;
 655
 656         if (lmm->lmm_magic == LOV_MAGIC_COMP_V1) {
 657                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
 658
 659                 for (i = 0; i < comp_v1->lcm_entry_count; i++) {
 660                         v1 = (struct lov_mds_md *)((char *)comp_v1 +
 661                                 comp_v1->lcm_entries[i].lcme_offset);
 662                         /* We don't support partial release for now */
 663                         if (!(v1->lmm_pattern & LOV_PATTERN_F_RELEASED))
 664                                 return false;
 665                 }
 666                 return true;
 667         } else {
 668                 return (lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) ?
 669                         true : false;
 670         }
 671 }
 672
 673 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 674                         const struct lu_attr *attr, const struct lu_fid *fid)
 675 {
 676         struct md_attr *ma = &info->mti_attr;
 677         struct obd_export *exp = info->mti_exp;
 678         struct lu_nodemap *nodemap = NULL;
 679
 680         LASSERT(ma->ma_valid & MA_INODE);
 681
 682         if (attr->la_valid & LA_ATIME) {
 683                 b->mbo_atime = attr->la_atime;
 684                 b->mbo_valid |= OBD_MD_FLATIME;
 685         }
 686         if (attr->la_valid & LA_MTIME) {
 687                 b->mbo_mtime = attr->la_mtime;
 688                 b->mbo_valid |= OBD_MD_FLMTIME;
 689         }
 690         if (attr->la_valid & LA_CTIME) {
 691                 b->mbo_ctime = attr->la_ctime;
 692                 b->mbo_valid |= OBD_MD_FLCTIME;
 693         }
 694         if (attr->la_valid & LA_FLAGS) {
 695                 b->mbo_flags = attr->la_flags;
 696                 b->mbo_valid |= OBD_MD_FLFLAGS;
 697         }
 698         if (attr->la_valid & LA_NLINK) {
 699                 b->mbo_nlink = attr->la_nlink;
 700                 b->mbo_valid |= OBD_MD_FLNLINK;
 701         }
 702         if (attr->la_valid & (LA_UID|LA_GID)) {
 703                 nodemap = nodemap_get_from_exp(exp);
 704                 if (IS_ERR(nodemap))
 705                         goto out;
 706         }
 707         if (attr->la_valid & LA_UID) {
 708                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 709                                             NODEMAP_FS_TO_CLIENT,
 710                                             attr->la_uid);
 711                 b->mbo_valid |= OBD_MD_FLUID;
 712         }
 713         if (attr->la_valid & LA_GID) {
 714                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 715                                             NODEMAP_FS_TO_CLIENT,
 716                                             attr->la_gid);
 717                 b->mbo_valid |= OBD_MD_FLGID;
 718         }
 719
 720         if (attr->la_valid & LA_PROJID) {
 721                 /* TODO, nodemap for project id */
 722                 b->mbo_projid = attr->la_projid;
 723                 b->mbo_valid |= OBD_MD_FLPROJID;
 724         }
 725
 726         b->mbo_mode = attr->la_mode;
 727         if (attr->la_valid & LA_MODE)
 728                 b->mbo_valid |= OBD_MD_FLMODE;
 729         if (attr->la_valid & LA_TYPE)
 730                 b->mbo_valid |= OBD_MD_FLTYPE;
 731
 732         if (fid != NULL) {
 733                 b->mbo_fid1 = *fid;
 734                 b->mbo_valid |= OBD_MD_FLID;
 735                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid=%#llx\n",
 736                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 737         }
 738
 739         if (!(attr->la_valid & LA_TYPE))
 740                 return;
 741
 742         b->mbo_rdev   = attr->la_rdev;
 743         b->mbo_size   = attr->la_size;
 744         b->mbo_blocks = attr->la_blocks;
 745
 746         if (!S_ISREG(attr->la_mode)) {
 747                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 748         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 749                 /* means no objects are allocated on osts. */
 750                 LASSERT(!(ma->ma_valid & MA_LOV));
 751                 /* just ignore blocks occupied by extend attributes on MDS */
 752                 b->mbo_blocks = 0;
 753                 /* if no object is allocated on osts, the size on mds is valid.
 754                  * b=22272 */
 755                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 756         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL) {
 757                 if (mdt_hsm_is_released(ma->ma_lmm)) {
 758                         /* A released file stores its size on MDS. */
 759                         /* But return 1 block for released file, unless tools
 760                          * like tar will consider it fully sparse. (LU-3864)
 761                          */
 762                         if (unlikely(b->mbo_size == 0))
 763                                 b->mbo_blocks = 0;
 764                         else
 765                                 b->mbo_blocks = 1;
 766                         b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 767                 } else if (info->mti_som_valid) { /* som is valid */
 768                         b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 769                 }
 770         }
 771
 772         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 773                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 774                        PFID(fid), (unsigned long long)b->mbo_size);
 775
 776 out:
 777         if (!IS_ERR_OR_NULL(nodemap))
 778                 nodemap_putref(nodemap);
 779 }
 780
 781 static inline int mdt_body_has_lov(const struct lu_attr *la,
 782                                    const struct mdt_body *body)
 783 {
 784         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 785                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 786 }
 787
 788 void mdt_client_compatibility(struct mdt_thread_info *info)
 789 {
 790         struct mdt_body       *body;
 791         struct ptlrpc_request *req = mdt_info_req(info);
 792         struct obd_export     *exp = req->rq_export;
 793         struct md_attr        *ma = &info->mti_attr;
 794         struct lu_attr        *la = &ma->ma_attr;
 795         ENTRY;
 796
 797         if (exp_connect_layout(exp))
 798                 /* the client can deal with 16-bit lmm_stripe_count */
 799                 RETURN_EXIT;
 800
 801         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 802
 803         if (!mdt_body_has_lov(la, body))
 804                 RETURN_EXIT;
 805
 806         /* now we have a reply with a lov for a client not compatible with the
 807          * layout lock so we have to clean the layout generation number */
 808         if (S_ISREG(la->la_mode))
 809                 ma->ma_lmm->lmm_layout_gen = 0;
 810         EXIT;
 811 }
 812
 813 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 814                                    struct mdt_object *o)
 815 {
 816         const struct lu_env *env = info->mti_env;
 817         int rc, rc2;
 818
 819         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 820                           XATTR_NAME_LOV);
 821
 822         if (rc == -ENODATA)
 823                 rc = 0;
 824
 825         if (rc < 0)
 826                 goto out;
 827
 828         /* Is it a directory? Let's check for the LMV as well */
 829         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 830                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 831                                    XATTR_NAME_LMV);
 832
 833                 if (rc2 == -ENODATA)
 834                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 835                                            &LU_BUF_NULL,
 836                                            XATTR_NAME_DEFAULT_LMV);
 837
 838                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 839                         rc = rc2;
 840         }
 841
 842 out:
 843         return rc;
 844 }
 845
 846 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 847                       const char *name)
 848 {
 849         const struct lu_env *env = info->mti_env;
 850         int rc;
 851         ENTRY;
 852
 853         LASSERT(info->mti_big_lmm_used == 0);
 854         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 855         if (rc < 0)
 856                 RETURN(rc);
 857
 858         /* big_lmm may need to be grown */
 859         if (info->mti_big_lmmsize < rc) {
 860                 int size = size_roundup_power2(rc);
 861
 862                 if (info->mti_big_lmmsize > 0) {
 863                         /* free old buffer */
 864                         LASSERT(info->mti_big_lmm);
 865                         OBD_FREE_LARGE(info->mti_big_lmm,
 866                                        info->mti_big_lmmsize);
 867                         info->mti_big_lmm = NULL;
 868                         info->mti_big_lmmsize = 0;
 869                 }
 870
 871                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 872                 if (info->mti_big_lmm == NULL)
 873                         RETURN(-ENOMEM);
 874                 info->mti_big_lmmsize = size;
 875         }
 876         LASSERT(info->mti_big_lmmsize >= rc);
 877
 878         info->mti_buf.lb_buf = info->mti_big_lmm;
 879         info->mti_buf.lb_len = info->mti_big_lmmsize;
 880         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 881
 882         RETURN(rc);
 883 }
 884
 885 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 886                    struct md_attr *ma, const char *name)
 887 {
 888         struct md_object *next = mdt_object_child(o);
 889         struct lu_buf    *buf = &info->mti_buf;
 890         int rc;
 891
 892         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 893                 buf->lb_buf = ma->ma_lmm;
 894                 buf->lb_len = ma->ma_lmm_size;
 895                 LASSERT(!(ma->ma_valid & MA_LOV));
 896         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 897                 buf->lb_buf = ma->ma_lmv;
 898                 buf->lb_len = ma->ma_lmv_size;
 899                 LASSERT(!(ma->ma_valid & MA_LMV));
 900         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 901                 buf->lb_buf = ma->ma_lmv;
 902                 buf->lb_len = ma->ma_lmv_size;
 903                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 904         } else {
 905                 return -EINVAL;
 906         }
 907
 908         rc = mo_xattr_get(info->mti_env, next, buf, name);
 909         if (rc > 0) {
 910
 911 got:
 912                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 913                         if (info->mti_big_lmm_used)
 914                                 ma->ma_lmm = info->mti_big_lmm;
 915
 916                         /* NOT return LOV EA with hole to old client. */
 917                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 918                                      LOV_PATTERN_F_HOLE) &&
 919                             !(exp_connect_flags(info->mti_exp) &
 920                               OBD_CONNECT_LFSCK)) {
 921                                 return -EIO;
 922                         } else {
 923                                 ma->ma_lmm_size = rc;
 924                                 ma->ma_valid |= MA_LOV;
 925                         }
 926                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 927                         if (info->mti_big_lmm_used)
 928                                 ma->ma_lmv = info->mti_big_lmm;
 929
 930                         ma->ma_lmv_size = rc;
 931                         ma->ma_valid |= MA_LMV;
 932                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 933                         ma->ma_lmv_size = rc;
 934                         ma->ma_valid |= MA_LMV_DEF;
 935                 }
 936
 937                 /* Update mdt_max_mdsize so all clients will be aware that */
 938                 if (info->mti_mdt->mdt_max_mdsize < rc)
 939                         info->mti_mdt->mdt_max_mdsize = rc;
 940
 941                 rc = 0;
 942         } else if (rc == -ENODATA) {
 943                 /* no LOV EA */
 944                 rc = 0;
 945         } else if (rc == -ERANGE) {
 946                 /* Default LMV has fixed size, so it must be able to fit
 947                  * in the original buffer */
 948                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 949                         return rc;
 950                 rc = mdt_big_xattr_get(info, o, name);
 951                 if (rc > 0) {
 952                         info->mti_big_lmm_used = 1;
 953                         goto got;
 954                 }
 955         }
 956
 957         return rc;
 958 }
 959
 960 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 961                              struct mdt_object *o, struct lu_fid *pfid)
 962 {
 963         struct lu_buf           *buf = &info->mti_buf;
 964         struct link_ea_header   *leh;
 965         struct link_ea_entry    *lee;
 966         int                      rc;
 967         ENTRY;
 968
 969         buf->lb_buf = info->mti_big_lmm;
 970         buf->lb_len = info->mti_big_lmmsize;
 971         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 972                           buf, XATTR_NAME_LINK);
 973         /* ignore errors, MA_PFID won't be set and it is
 974          * up to the caller to treat this as an error */
 975         if (rc == -ERANGE || buf->lb_len == 0) {
 976                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 977                 buf->lb_buf = info->mti_big_lmm;
 978                 buf->lb_len = info->mti_big_lmmsize;
 979         }
 980
 981         if (rc < 0)
 982                 RETURN(rc);
 983         if (rc < sizeof(*leh)) {
 984                 CERROR("short LinkEA on "DFID": rc = %d\n",
 985                        PFID(mdt_object_fid(o)), rc);
 986                 RETURN(-ENODATA);
 987         }
 988
 989         leh = (struct link_ea_header *) buf->lb_buf;
 990         lee = (struct link_ea_entry *)(leh + 1);
 991         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 992                 leh->leh_magic = LINK_EA_MAGIC;
 993                 leh->leh_reccount = __swab32(leh->leh_reccount);
 994                 leh->leh_len = __swab64(leh->leh_len);
 995         }
 996         if (leh->leh_magic != LINK_EA_MAGIC)
 997                 RETURN(-EINVAL);
 998         if (leh->leh_reccount == 0)
 999                 RETURN(-ENODATA);
1000
1001         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
1002         fid_be_to_cpu(pfid, pfid);
1003
1004         RETURN(0);
1005 }
1006
1007 int mdt_attr_get_complex(struct mdt_thread_info *info,
1008                          struct mdt_object *o, struct md_attr *ma)
1009 {
1010         const struct lu_env *env = info->mti_env;
1011         struct md_object    *next = mdt_object_child(o);
1012         struct lu_buf       *buf = &info->mti_buf;
1013         int                  need = ma->ma_need;
1014         int                  rc = 0, rc2;
1015         u32                  mode;
1016         ENTRY;
1017
1018         ma->ma_valid = 0;
1019
1020         if (mdt_object_exists(o) == 0)
1021                 GOTO(out, rc = -ENOENT);
1022         mode = lu_object_attr(&next->mo_lu);
1023
1024         if (need & MA_INODE) {
1025                 ma->ma_need = MA_INODE;
1026                 rc = mo_attr_get(env, next, ma);
1027                 if (rc)
1028                         GOTO(out, rc);
1029
1030                 if (S_ISREG(mode))
1031                         (void) mdt_get_som(info, o, &ma->ma_attr);
1032                 ma->ma_valid |= MA_INODE;
1033         }
1034
1035         if (need & MA_PFID) {
1036                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
1037                 if (rc == 0)
1038                         ma->ma_valid |= MA_PFID;
1039                 /* ignore this error, parent fid is not mandatory */
1040                 rc = 0;
1041         }
1042
1043         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
1044                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
1045                 if (rc)
1046                         GOTO(out, rc);
1047         }
1048
1049         if (need & MA_LMV && S_ISDIR(mode)) {
1050                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
1051                 if (rc != 0)
1052                         GOTO(out, rc);
1053         }
1054
1055         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
1056                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
1057                 if (rc != 0)
1058                         GOTO(out, rc);
1059         }
1060
1061         if (need & MA_HSM && S_ISREG(mode)) {
1062                 buf->lb_buf = info->mti_xattr_buf;
1063                 buf->lb_len = sizeof(info->mti_xattr_buf);
1064                 CLASSERT(sizeof(struct hsm_attrs) <=
1065                          sizeof(info->mti_xattr_buf));
1066                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
1067                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
1068                 if (rc2 == 0)
1069                         ma->ma_valid |= MA_HSM;
1070                 else if (rc2 < 0 && rc2 != -ENODATA)
1071                         GOTO(out, rc = rc2);
1072         }
1073
1074 #ifdef CONFIG_FS_POSIX_ACL
1075         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
1076                 buf->lb_buf = ma->ma_acl;
1077                 buf->lb_len = ma->ma_acl_size;
1078                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
1079                 if (rc2 > 0) {
1080                         ma->ma_acl_size = rc2;
1081                         ma->ma_valid |= MA_ACL_DEF;
1082                 } else if (rc2 == -ENODATA) {
1083                         /* no ACLs */
1084                         ma->ma_acl_size = 0;
1085                 } else
1086                         GOTO(out, rc = rc2);
1087         }
1088 #endif
1089 out:
1090         ma->ma_need = need;
1091         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = %#llx ma_lmm=%p\n",
1092                rc, ma->ma_valid, ma->ma_lmm);
1093         RETURN(rc);
1094 }
1095
1096 static int mdt_getattr_internal(struct mdt_thread_info *info,
1097                                 struct mdt_object *o, int ma_need)
1098 {
1099         struct md_object        *next = mdt_object_child(o);
1100         const struct mdt_body   *reqbody = info->mti_body;
1101         struct ptlrpc_request   *req = mdt_info_req(info);
1102         struct md_attr          *ma = &info->mti_attr;
1103         struct lu_attr          *la = &ma->ma_attr;
1104         struct req_capsule      *pill = info->mti_pill;
1105         const struct lu_env     *env = info->mti_env;
1106         struct mdt_body         *repbody;
1107         struct lu_buf           *buffer = &info->mti_buf;
1108         struct obd_export       *exp = info->mti_exp;
1109         int                      rc;
1110         ENTRY;
1111
1112         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
1113                 RETURN(err_serious(-ENOMEM));
1114
1115         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1116
1117         ma->ma_valid = 0;
1118
1119         if (mdt_object_remote(o)) {
1120                 /* This object is located on remote node.*/
1121                 /* Return -ENOTSUPP for old client */
1122                 if (!mdt_is_dne_client(req->rq_export))
1123                         GOTO(out, rc = -ENOTSUPP);
1124
1125                 repbody->mbo_fid1 = *mdt_object_fid(o);
1126                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
1127                 GOTO(out, rc = 0);
1128         }
1129
1130         if (reqbody->mbo_eadatasize > 0) {
1131                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
1132                 if (buffer->lb_buf == NULL)
1133                         GOTO(out, rc = -EPROTO);
1134                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
1135                                                       RCL_SERVER);
1136         } else {
1137                 buffer->lb_buf = NULL;
1138                 buffer->lb_len = 0;
1139                 ma_need &= ~(MA_LOV | MA_LMV);
1140                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
1141                        mdt_obd_name(info->mti_mdt),
1142                        req->rq_export->exp_client_uuid.uuid);
1143         }
1144
1145         /* If it is dir object and client require MEA, then we got MEA */
1146         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1147             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
1148                 /* Assumption: MDT_MD size is enough for lmv size. */
1149                 ma->ma_lmv = buffer->lb_buf;
1150                 ma->ma_lmv_size = buffer->lb_len;
1151                 ma->ma_need = MA_INODE;
1152                 if (ma->ma_lmv_size > 0) {
1153                         if (reqbody->mbo_valid & OBD_MD_MEA)
1154                                 ma->ma_need |= MA_LMV;
1155                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
1156                                 ma->ma_need |= MA_LMV_DEF;
1157                 }
1158         } else {
1159                 ma->ma_lmm = buffer->lb_buf;
1160                 ma->ma_lmm_size = buffer->lb_len;
1161                 ma->ma_need = MA_INODE | MA_HSM;
1162                 if (ma->ma_lmm_size > 0)
1163                         ma->ma_need |= MA_LOV;
1164         }
1165
1166         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1167             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
1168             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
1169                 /* get default stripe info for this dir. */
1170                 ma->ma_need |= MA_LOV_DEF;
1171         }
1172         ma->ma_need |= ma_need;
1173
1174         rc = mdt_attr_get_complex(info, o, ma);
1175         if (unlikely(rc)) {
1176                 CDEBUG(rc == -ENOENT ? D_OTHER : D_ERROR,
1177                        "%s: getattr error for "DFID": rc = %d\n",
1178                        mdt_obd_name(info->mti_mdt),
1179                        PFID(mdt_object_fid(o)), rc);
1180                 RETURN(rc);
1181         }
1182
1183         /* if file is released, check if a restore is running */
1184         if (ma->ma_valid & MA_HSM) {
1185                 repbody->mbo_valid |= OBD_MD_TSTATE;
1186                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
1187                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
1188                         repbody->mbo_t_state = MS_RESTORE;
1189         }
1190
1191         if (likely(ma->ma_valid & MA_INODE))
1192                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
1193         else
1194                 RETURN(-EFAULT);
1195
1196         if (mdt_body_has_lov(la, reqbody)) {
1197                 if (ma->ma_valid & MA_LOV) {
1198                         LASSERT(ma->ma_lmm_size);
1199                         repbody->mbo_eadatasize = ma->ma_lmm_size;
1200                         if (S_ISDIR(la->la_mode))
1201                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
1202                         else
1203                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
1204                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
1205                 }
1206                 if (ma->ma_valid & MA_LMV) {
1207                         /* Return -ENOTSUPP for old client */
1208                         if (!mdt_is_striped_client(req->rq_export))
1209                                 RETURN(-ENOTSUPP);
1210
1211                         LASSERT(S_ISDIR(la->la_mode));
1212                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1213                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1214                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
1215                 }
1216                 if (ma->ma_valid & MA_LMV_DEF) {
1217                         /* Return -ENOTSUPP for old client */
1218                         if (!mdt_is_striped_client(req->rq_export))
1219                                 RETURN(-ENOTSUPP);
1220                         LASSERT(S_ISDIR(la->la_mode));
1221                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1222                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1223                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
1224                                                OBD_MD_DEFAULT_MEA);
1225                 }
1226         } else if (S_ISLNK(la->la_mode) &&
1227                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
1228                 buffer->lb_buf = ma->ma_lmm;
1229                 /* eadatasize from client includes NULL-terminator, so
1230                  * there is no need to read it */
1231                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
1232                 rc = mo_readlink(env, next, buffer);
1233                 if (unlikely(rc <= 0)) {
1234                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
1235                                mdt_obd_name(info->mti_mdt),
1236                                PFID(mdt_object_fid(o)), rc);
1237                         rc = -EFAULT;
1238                 } else {
1239                         int print_limit = min_t(int, PAGE_SIZE - 128, rc);
1240
1241                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
1242                                 rc -= 2;
1243                         repbody->mbo_valid |= OBD_MD_LINKNAME;
1244                         /* we need to report back size with NULL-terminator
1245                          * because client expects that */
1246                         repbody->mbo_eadatasize = rc + 1;
1247                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1248                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1249                                        "on "DFID ", expected %d\n",
1250                                        mdt_obd_name(info->mti_mdt),
1251                                        rc, PFID(mdt_object_fid(o)),
1252                                        reqbody->mbo_eadatasize - 1);
1253                         /* NULL terminate */
1254                         ((char *)ma->ma_lmm)[rc] = 0;
1255
1256                         /* If the total CDEBUG() size is larger than a page, it
1257                          * will print a warning to the console, avoid this by
1258                          * printing just the last part of the symlink. */
1259                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1260                                print_limit < rc ? "..." : "", print_limit,
1261                                (char *)ma->ma_lmm + rc - print_limit, rc);
1262                         rc = 0;
1263                 }
1264         }
1265
1266         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1267                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1268                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1269                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1270                        repbody->mbo_max_mdsize);
1271         }
1272
1273 #ifdef CONFIG_FS_POSIX_ACL
1274         if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1275                  (reqbody->mbo_valid & OBD_MD_FLACL)) {
1276                 struct lu_nodemap *nodemap = nodemap_get_from_exp(exp);
1277                 if (IS_ERR(nodemap))
1278                         RETURN(PTR_ERR(nodemap));
1279
1280                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1281                 nodemap_putref(nodemap);
1282         }
1283 #endif
1284
1285 out:
1286         if (rc == 0)
1287                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1288
1289         RETURN(rc);
1290 }
1291
1292 static int mdt_getattr(struct tgt_session_info *tsi)
1293 {
1294         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1295         struct mdt_object       *obj = info->mti_object;
1296         struct req_capsule      *pill = info->mti_pill;
1297         struct mdt_body         *reqbody;
1298         struct mdt_body         *repbody;
1299         int rc, rc2;
1300         ENTRY;
1301
1302         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1303         LASSERT(reqbody);
1304         LASSERT(obj != NULL);
1305         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1306
1307         /* Unlike intent case where we need to pre-fill out buffers early on
1308          * in intent policy for ldlm reasons, here we can have a much better
1309          * guess at EA size by just reading it from disk.
1310          * Exceptions are readdir and (missing) directory striping */
1311         /* Readlink */
1312         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1313                 /* No easy way to know how long is the symlink, but it cannot
1314                  * be more than PATH_MAX, so we allocate +1 */
1315                 rc = PATH_MAX + 1;
1316
1317         /* A special case for fs ROOT: getattr there might fetch
1318          * default EA for entire fs, not just for this dir!
1319          */
1320         } else if (lu_fid_eq(mdt_object_fid(obj),
1321                              &info->mti_mdt->mdt_md_root_fid) &&
1322                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1323                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1324                                                                  MDS_GETATTR)) {
1325                 /* Should the default strping be bigger, mdt_fix_reply
1326                  * will reallocate */
1327                 rc = DEF_REP_MD_SIZE;
1328         } else {
1329                 /* Read the actual EA size from disk */
1330                 rc = mdt_attr_get_eabuf_size(info, obj);
1331         }
1332
1333         if (rc < 0)
1334                 GOTO(out, rc = err_serious(rc));
1335
1336         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1337
1338         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
1339          * by default. If the target object has more ACL entries, then
1340          * enlarge the buffer when necessary. */
1341         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
1342                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
1343
1344         rc = req_capsule_server_pack(pill);
1345         if (unlikely(rc != 0))
1346                 GOTO(out, rc = err_serious(rc));
1347
1348         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1349         LASSERT(repbody != NULL);
1350         repbody->mbo_eadatasize = 0;
1351         repbody->mbo_aclsize = 0;
1352
1353         rc = mdt_check_ucred(info);
1354         if (unlikely(rc))
1355                 GOTO(out_shrink, rc);
1356
1357         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1358
1359         rc = mdt_getattr_internal(info, obj, 0);
1360         EXIT;
1361 out_shrink:
1362         mdt_client_compatibility(info);
1363         rc2 = mdt_fix_reply(info);
1364         if (rc == 0)
1365                 rc = rc2;
1366 out:
1367         mdt_thread_info_fini(info);
1368         return rc;
1369 }
1370
1371 /**
1372  * Handler of layout intent RPC requiring the layout modification
1373  *
1374  * \param[in] info      thread environment
1375  * \param[in] obj       object
1376  * \param[in] layout    layout change descriptor
1377  *
1378  * \retval 0    on success
1379  * \retval < 0  error code
1380  */
1381 int mdt_layout_change(struct mdt_thread_info *info, struct mdt_object *obj,
1382                       struct md_layout_change *layout)
1383 {
1384         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LOCAL];
1385         int rc;
1386         ENTRY;
1387
1388         if (!mdt_object_exists(obj))
1389                 GOTO(out, rc = -ENOENT);
1390
1391         if (!S_ISREG(lu_object_attr(&obj->mot_obj)))
1392                 GOTO(out, rc = -EINVAL);
1393
1394         rc = mo_permission(info->mti_env, NULL, mdt_object_child(obj), NULL,
1395                            MAY_WRITE);
1396         if (rc)
1397                 GOTO(out, rc);
1398
1399         /* take layout lock to prepare layout change */
1400         mdt_lock_reg_init(lh, LCK_EX);
1401         rc = mdt_object_lock(info, obj, lh, MDS_INODELOCK_LAYOUT);
1402         if (rc)
1403                 GOTO(out, rc);
1404
1405         rc = mo_layout_change(info->mti_env, mdt_object_child(obj), layout);
1406
1407         mdt_object_unlock(info, obj, lh, 1);
1408 out:
1409         RETURN(rc);
1410 }
1411
1412 /**
1413  * Exchange MOF_LOV_CREATED flags between two objects after a
1414  * layout swap. No assumption is made on whether o1 or o2 have
1415  * created objects or not.
1416  *
1417  * \param[in,out] o1    First swap layout object
1418  * \param[in,out] o2    Second swap layout object
1419  */
1420 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1421 {
1422         unsigned int o1_lov_created = o1->mot_lov_created;
1423
1424         mutex_lock(&o1->mot_lov_mutex);
1425         mutex_lock(&o2->mot_lov_mutex);
1426
1427         o1->mot_lov_created = o2->mot_lov_created;
1428         o2->mot_lov_created = o1_lov_created;
1429
1430         mutex_unlock(&o2->mot_lov_mutex);
1431         mutex_unlock(&o1->mot_lov_mutex);
1432 }
1433
1434 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1435 {
1436         struct mdt_thread_info  *info;
1437         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1438         struct obd_export       *exp = req->rq_export;
1439         struct mdt_object       *o1, *o2, *o;
1440         struct mdt_lock_handle  *lh1, *lh2;
1441         struct mdc_swap_layouts *msl;
1442         int                      rc;
1443         ENTRY;
1444
1445         /* client does not support layout lock, so layout swaping
1446          * is disabled.
1447          * FIXME: there is a problem for old clients which don't support
1448          * layout lock yet. If those clients have already opened the file
1449          * they won't be notified at all so that old layout may still be
1450          * used to do IO. This can be fixed after file release is landed by
1451          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1452         if (!exp_connect_layout(exp))
1453                 RETURN(-EOPNOTSUPP);
1454
1455         info = tsi2mdt_info(tsi);
1456
1457         if (info->mti_dlm_req != NULL)
1458                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1459
1460         o1 = info->mti_object;
1461         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1462                                 &info->mti_body->mbo_fid2);
1463         if (IS_ERR(o))
1464                 GOTO(out, rc = PTR_ERR(o));
1465
1466         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1467                 GOTO(put, rc = -ENOENT);
1468
1469         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1470         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1471                 GOTO(put, rc);
1472
1473         if (rc < 0)
1474                 swap(o1, o2);
1475
1476         /* permission check. Make sure the calling process having permission
1477          * to write both files. */
1478         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1479                                 MAY_WRITE);
1480         if (rc < 0)
1481                 GOTO(put, rc);
1482
1483         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1484                                 MAY_WRITE);
1485         if (rc < 0)
1486                 GOTO(put, rc);
1487
1488         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1489         if (msl == NULL)
1490                 GOTO(put, rc = -EPROTO);
1491
1492         lh1 = &info->mti_lh[MDT_LH_NEW];
1493         mdt_lock_reg_init(lh1, LCK_EX);
1494         lh2 = &info->mti_lh[MDT_LH_OLD];
1495         mdt_lock_reg_init(lh2, LCK_EX);
1496
1497         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1498                              MDS_INODELOCK_XATTR);
1499         if (rc < 0)
1500                 GOTO(put, rc);
1501
1502         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1503                              MDS_INODELOCK_XATTR);
1504         if (rc < 0)
1505                 GOTO(unlock1, rc);
1506
1507         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1508                              mdt_object_child(o2), msl->msl_flags);
1509         if (rc < 0)
1510                 GOTO(unlock2, rc);
1511
1512         mdt_swap_lov_flag(o1, o2);
1513
1514 unlock2:
1515         mdt_object_unlock(info, o2, lh2, rc);
1516 unlock1:
1517         mdt_object_unlock(info, o1, lh1, rc);
1518 put:
1519         mdt_object_put(info->mti_env, o);
1520 out:
1521         mdt_thread_info_fini(info);
1522         RETURN(rc);
1523 }
1524
1525 static int mdt_raw_lookup(struct mdt_thread_info *info,
1526                           struct mdt_object *parent,
1527                           const struct lu_name *lname,
1528                           struct ldlm_reply *ldlm_rep)
1529 {
1530         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1531         int              rc;
1532         ENTRY;
1533
1534         LASSERT(!info->mti_cross_ref);
1535
1536         /* Only got the fid of this obj by name */
1537         fid_zero(child_fid);
1538         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1539                         lname, child_fid, &info->mti_spec);
1540         if (rc == 0) {
1541                 struct mdt_body *repbody;
1542
1543                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1544                 repbody->mbo_fid1 = *child_fid;
1545                 repbody->mbo_valid = OBD_MD_FLID;
1546                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1547         } else if (rc == -ENOENT) {
1548                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1549         }
1550
1551         RETURN(rc);
1552 }
1553
1554 /*
1555  * UPDATE lock should be taken against parent, and be released before exit;
1556  * child_bits lock should be taken against child, and be returned back:
1557  *            (1)normal request should release the child lock;
1558  *            (2)intent request will grant the lock to client.
1559  */
1560 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1561                                  struct mdt_lock_handle *lhc,
1562                                  __u64 child_bits,
1563                                  struct ldlm_reply *ldlm_rep)
1564 {
1565         struct ptlrpc_request  *req = mdt_info_req(info);
1566         struct mdt_body        *reqbody = NULL;
1567         struct mdt_object      *parent = info->mti_object;
1568         struct mdt_object      *child;
1569         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1570         struct lu_name         *lname = NULL;
1571         struct mdt_lock_handle *lhp = NULL;
1572         struct ldlm_lock       *lock;
1573         __u64 try_bits = 0;
1574         bool is_resent;
1575         int ma_need = 0;
1576         int rc;
1577
1578         ENTRY;
1579
1580         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1581         LASSERT(ergo(is_resent,
1582                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1583
1584         if (parent == NULL)
1585                 RETURN(-ENOENT);
1586
1587         if (info->mti_cross_ref) {
1588                 /* Only getattr on the child. Parent is on another node. */
1589                 mdt_set_disposition(info, ldlm_rep,
1590                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1591                 child = parent;
1592                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1593                        "ldlm_rep = %p\n",
1594                        PFID(mdt_object_fid(child)), ldlm_rep);
1595
1596                 rc = mdt_check_resent_lock(info, child, lhc);
1597                 if (rc < 0) {
1598                         RETURN(rc);
1599                 } else if (rc > 0) {
1600                         mdt_lock_handle_init(lhc);
1601                         mdt_lock_reg_init(lhc, LCK_PR);
1602
1603                         /*
1604                          * Object's name is on another MDS, no lookup or layout
1605                          * lock is needed here but update lock is.
1606                          */
1607                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1608                                         MDS_INODELOCK_LAYOUT);
1609                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1610
1611                         rc = mdt_object_lock(info, child, lhc, child_bits);
1612                         if (rc < 0)
1613                                 RETURN(rc);
1614                 }
1615
1616                 /* Finally, we can get attr for child. */
1617                 if (!mdt_object_exists(child)) {
1618                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1619                                         &child->mot_obj,
1620                                         "remote object doesn't exist.");
1621                         mdt_object_unlock(info, child, lhc, 1);
1622                         RETURN(-ENOENT);
1623                 }
1624
1625                 rc = mdt_getattr_internal(info, child, 0);
1626                 if (unlikely(rc != 0))
1627                         mdt_object_unlock(info, child, lhc, 1);
1628
1629                 RETURN(rc);
1630         }
1631
1632         lname = &info->mti_name;
1633         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1634
1635         if (lu_name_is_valid(lname)) {
1636                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1637                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1638                        PNAME(lname), ldlm_rep);
1639         } else {
1640                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1641                 if (unlikely(reqbody == NULL))
1642                         RETURN(err_serious(-EPROTO));
1643
1644                 *child_fid = reqbody->mbo_fid2;
1645
1646                 if (unlikely(!fid_is_sane(child_fid)))
1647                         RETURN(err_serious(-EINVAL));
1648
1649                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1650                        "ldlm_rep = %p\n",
1651                        PFID(mdt_object_fid(parent)),
1652                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1653         }
1654
1655         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1656
1657         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1658                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1659                                 &parent->mot_obj,
1660                                 "Parent doesn't exist!");
1661                 RETURN(-ESTALE);
1662         }
1663
1664         if (mdt_object_remote(parent)) {
1665                 CERROR("%s: parent "DFID" is on remote target\n",
1666                        mdt_obd_name(info->mti_mdt),
1667                        PFID(mdt_object_fid(parent)));
1668                 RETURN(-EIO);
1669         }
1670
1671         if (lu_name_is_valid(lname)) {
1672                 /* Always allow to lookup ".." */
1673                 if (unlikely(lname->ln_namelen == 2 &&
1674                              lname->ln_name[0] == '.' &&
1675                              lname->ln_name[1] == '.'))
1676                         info->mti_spec.sp_permitted = 1;
1677
1678                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1679                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1680
1681                         RETURN(rc);
1682                 }
1683
1684                 /* step 1: lock parent only if parent is a directory */
1685                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1686                         lhp = &info->mti_lh[MDT_LH_PARENT];
1687                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1688                         rc = mdt_object_lock(info, parent, lhp,
1689                                              MDS_INODELOCK_UPDATE);
1690                         if (unlikely(rc != 0))
1691                                 RETURN(rc);
1692                 }
1693
1694                 /* step 2: lookup child's fid by name */
1695                 fid_zero(child_fid);
1696                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1697                                 child_fid, &info->mti_spec);
1698                 if (rc == -ENOENT)
1699                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1700
1701                 if (rc != 0)
1702                         GOTO(out_parent, rc);
1703         }
1704
1705         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1706
1707         /*
1708          *step 3: find the child object by fid & lock it.
1709          *        regardless if it is local or remote.
1710          *
1711          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1712          *      set parent dir fid the same as child fid in getattr by fid case
1713          *      we should not lu_object_find() the object again, could lead
1714          *      to hung if there is a concurrent unlink destroyed the object.
1715          */
1716         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1717                 mdt_object_get(info->mti_env, parent);
1718                 child = parent;
1719         } else {
1720                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1721                                         child_fid);
1722         }
1723
1724         if (unlikely(IS_ERR(child)))
1725                 GOTO(out_parent, rc = PTR_ERR(child));
1726
1727         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1728         if (!mdt_object_exists(child)) {
1729                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1730                                 &child->mot_obj,
1731                                 "Object doesn't exist!");
1732                 GOTO(out_child, rc = -ENOENT);
1733         }
1734
1735         rc = mdt_check_resent_lock(info, child, lhc);
1736         if (rc < 0) {
1737                 GOTO(out_child, rc);
1738         } else if (rc > 0) {
1739                 mdt_lock_handle_init(lhc);
1740                 mdt_lock_reg_init(lhc, LCK_PR);
1741
1742                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1743                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1744                         struct md_attr *ma = &info->mti_attr;
1745
1746                         ma->ma_valid = 0;
1747                         ma->ma_need = MA_INODE;
1748                         rc = mdt_attr_get_complex(info, child, ma);
1749                         if (unlikely(rc != 0))
1750                                 GOTO(out_child, rc);
1751
1752                         /* If the file has not been changed for some time, we
1753                          * return not only a LOOKUP lock, but also an UPDATE
1754                          * lock and this might save us RPC on later STAT. For
1755                          * directories, it also let negative dentry cache start
1756                          * working for this dir. */
1757                         if (ma->ma_valid & MA_INODE &&
1758                             ma->ma_attr.la_valid & LA_CTIME &&
1759                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1760                                 ma->ma_attr.la_ctime < ktime_get_real_seconds())
1761                                 child_bits |= MDS_INODELOCK_UPDATE;
1762                 }
1763
1764                 /* layout lock must be granted in a best-effort way
1765                  * for IT operations */
1766                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1767                 if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
1768                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1769                         if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1770                             exp_connect_layout(info->mti_exp)) {
1771                                 /* try to grant layout lock for regular file. */
1772                                 try_bits = MDS_INODELOCK_LAYOUT;
1773                         }
1774                         /* Acquire DOM lock in advance for data-on-mdt file */
1775                         if (child != parent)
1776                                 try_bits |= MDS_INODELOCK_DOM;
1777                 }
1778
1779                 if (try_bits != 0) {
1780                         /* try layout lock, it may fail to be granted due to
1781                          * contention at LOOKUP or UPDATE */
1782                         rc = mdt_object_lock_try(info, child, lhc, &child_bits,
1783                                                  try_bits, false);
1784                         if (child_bits & MDS_INODELOCK_LAYOUT)
1785                                 ma_need |= MA_LOV;
1786                 } else {
1787                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1788                          * client will enqueue the lock to the remote MDT */
1789                         if (mdt_object_remote(child))
1790                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1791                         rc = mdt_object_lock(info, child, lhc, child_bits);
1792                 }
1793                 if (unlikely(rc != 0))
1794                         GOTO(out_child, rc);
1795         }
1796
1797         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1798
1799         /* finally, we can get attr for child. */
1800         rc = mdt_getattr_internal(info, child, ma_need);
1801         if (unlikely(rc != 0)) {
1802                 mdt_object_unlock(info, child, lhc, 1);
1803         } else if (lock) {
1804                 /* Debugging code. */
1805                 LDLM_DEBUG(lock, "Returning lock to client");
1806                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1807                                          &lock->l_resource->lr_name),
1808                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1809                          PLDLMRES(lock->l_resource),
1810                          PFID(mdt_object_fid(child)));
1811
1812                 if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
1813                     mdt_object_exists(child) && !mdt_object_remote(child) &&
1814                     child != parent) {
1815                         LDLM_LOCK_PUT(lock);
1816                         mdt_object_put(info->mti_env, child);
1817                         /* NB: call the mdt_pack_size2body always after
1818                          * mdt_object_put(), that is why this speacial
1819                          * exit path is used. */
1820                         rc = mdt_pack_size2body(info, child_fid,
1821                                                 child_bits & MDS_INODELOCK_DOM);
1822                         if (rc != 0 && child_bits & MDS_INODELOCK_DOM) {
1823                                 /* DOM lock was taken in advance but this is
1824                                  * not DoM file. Drop the lock. */
1825                                 lock_res_and_lock(lock);
1826                                 ldlm_inodebits_drop(lock, MDS_INODELOCK_DOM);
1827                                 unlock_res_and_lock(lock);
1828                         }
1829
1830                         GOTO(out_parent, rc = 0);
1831                 }
1832         }
1833         if (lock)
1834                 LDLM_LOCK_PUT(lock);
1835
1836         EXIT;
1837 out_child:
1838         mdt_object_put(info->mti_env, child);
1839 out_parent:
1840         if (lhp)
1841                 mdt_object_unlock(info, parent, lhp, 1);
1842         return rc;
1843 }
1844
1845 /* normal handler: should release the child lock */
1846 static int mdt_getattr_name(struct tgt_session_info *tsi)
1847 {
1848         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1849         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1850         struct mdt_body        *reqbody;
1851         struct mdt_body        *repbody;
1852         int rc, rc2;
1853         ENTRY;
1854
1855         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1856         LASSERT(reqbody != NULL);
1857         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1858         LASSERT(repbody != NULL);
1859
1860         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1861         repbody->mbo_eadatasize = 0;
1862         repbody->mbo_aclsize = 0;
1863
1864         rc = mdt_init_ucred_intent_getattr(info, reqbody);
1865         if (unlikely(rc))
1866                 GOTO(out_shrink, rc);
1867
1868         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1869         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1870                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1871                 lhc->mlh_reg_lh.cookie = 0;
1872         }
1873         mdt_exit_ucred(info);
1874         EXIT;
1875 out_shrink:
1876         mdt_client_compatibility(info);
1877         rc2 = mdt_fix_reply(info);
1878         if (rc == 0)
1879                 rc = rc2;
1880         mdt_thread_info_fini(info);
1881         return rc;
1882 }
1883
1884 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1885                          void *karg, void __user *uarg);
1886
1887 static int mdt_set_info(struct tgt_session_info *tsi)
1888 {
1889         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1890         char                    *key;
1891         void                    *val;
1892         int                      keylen, vallen, rc = 0;
1893
1894         ENTRY;
1895
1896         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1897         if (key == NULL) {
1898                 DEBUG_REQ(D_HA, req, "no set_info key");
1899                 RETURN(err_serious(-EFAULT));
1900         }
1901
1902         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1903                                       RCL_CLIENT);
1904
1905         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1906         if (val == NULL) {
1907                 DEBUG_REQ(D_HA, req, "no set_info val");
1908                 RETURN(err_serious(-EFAULT));
1909         }
1910
1911         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1912                                       RCL_CLIENT);
1913
1914         /* Swab any part of val you need to here */
1915         if (KEY_IS(KEY_READ_ONLY)) {
1916                 spin_lock(&req->rq_export->exp_lock);
1917                 if (*(__u32 *)val)
1918                         *exp_connect_flags_ptr(req->rq_export) |=
1919                                 OBD_CONNECT_RDONLY;
1920                 else
1921                         *exp_connect_flags_ptr(req->rq_export) &=
1922                                 ~OBD_CONNECT_RDONLY;
1923                 spin_unlock(&req->rq_export->exp_lock);
1924         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1925                 struct changelog_setinfo *cs = val;
1926
1927                 if (vallen != sizeof(*cs)) {
1928                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1929                                tgt_name(tsi->tsi_tgt), vallen);
1930                         RETURN(-EINVAL);
1931                 }
1932                 if (ptlrpc_req_need_swab(req)) {
1933                         __swab64s(&cs->cs_recno);
1934                         __swab32s(&cs->cs_id);
1935                 }
1936
1937                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1938                                    vallen, val, NULL);
1939         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
1940                 if (vallen > 0)
1941                         obd_export_evict_by_nid(req->rq_export->exp_obd, val);
1942         } else {
1943                 RETURN(-EINVAL);
1944         }
1945         RETURN(rc);
1946 }
1947
1948 static int mdt_readpage(struct tgt_session_info *tsi)
1949 {
1950         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1951         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1952         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1953         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1954         struct mdt_body         *repbody;
1955         int                      rc;
1956         int                      i;
1957
1958         ENTRY;
1959
1960         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1961                 RETURN(err_serious(-ENOMEM));
1962
1963         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1964         if (repbody == NULL || reqbody == NULL)
1965                 RETURN(err_serious(-EFAULT));
1966
1967         /*
1968          * prepare @rdpg before calling lower layers and transfer itself. Here
1969          * reqbody->size contains offset of where to start to read and
1970          * reqbody->nlink contains number bytes to read.
1971          */
1972         rdpg->rp_hash = reqbody->mbo_size;
1973         if (rdpg->rp_hash != reqbody->mbo_size) {
1974                 CERROR("Invalid hash: %#llx != %#llx\n",
1975                        rdpg->rp_hash, reqbody->mbo_size);
1976                 RETURN(-EFAULT);
1977         }
1978
1979         rdpg->rp_attrs = reqbody->mbo_mode;
1980         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1981                 rdpg->rp_attrs |= LUDA_64BITHASH;
1982         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1983                                 exp_max_brw_size(tsi->tsi_exp));
1984         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >>
1985                           PAGE_SHIFT;
1986         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1987         if (rdpg->rp_pages == NULL)
1988                 RETURN(-ENOMEM);
1989
1990         for (i = 0; i < rdpg->rp_npages; ++i) {
1991                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1992                 if (rdpg->rp_pages[i] == NULL)
1993                         GOTO(free_rdpg, rc = -ENOMEM);
1994         }
1995
1996         /* call lower layers to fill allocated pages with directory data */
1997         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1998         if (rc < 0)
1999                 GOTO(free_rdpg, rc);
2000
2001         /* send pages to client */
2002         rc = tgt_sendpage(tsi, rdpg, rc);
2003
2004         EXIT;
2005 free_rdpg:
2006
2007         for (i = 0; i < rdpg->rp_npages; i++)
2008                 if (rdpg->rp_pages[i] != NULL)
2009                         __free_page(rdpg->rp_pages[i]);
2010         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
2011
2012         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
2013                 RETURN(0);
2014
2015         return rc;
2016 }
2017
2018 static int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
2019 {
2020         struct lu_ucred *uc = mdt_ucred_check(info);
2021         struct lu_attr *attr = &info->mti_attr.ma_attr;
2022
2023         if (uc == NULL)
2024                 return -EINVAL;
2025
2026         if (op != REINT_SETATTR) {
2027                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
2028                         attr->la_uid = uc->uc_fsuid;
2029                 /* for S_ISGID, inherit gid from his parent, such work will be
2030                  * done in cmm/mdd layer, here set all cases as uc->uc_fsgid. */
2031                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
2032                         attr->la_gid = uc->uc_fsgid;
2033         }
2034
2035         return 0;
2036 }
2037
2038 static int mdt_reint_internal(struct mdt_thread_info *info,
2039                               struct mdt_lock_handle *lhc,
2040                               __u32 op)
2041 {
2042         struct req_capsule      *pill = info->mti_pill;
2043         struct mdt_body         *repbody;
2044         int                      rc = 0, rc2;
2045
2046         ENTRY;
2047
2048         rc = mdt_reint_unpack(info, op);
2049         if (rc != 0) {
2050                 CERROR("Can't unpack reint, rc %d\n", rc);
2051                 RETURN(err_serious(rc));
2052         }
2053
2054         /* for replay (no_create) lmm is not needed, client has it already */
2055         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2056                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2057                                      DEF_REP_MD_SIZE);
2058
2059         /* llog cookies are always 0, the field is kept for compatibility */
2060         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2061                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
2062
2063         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
2064          * by default. If the target object has more ACL entries, then
2065          * enlarge the buffer when necessary. */
2066         if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
2067                 req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
2068                                      LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
2069
2070         rc = req_capsule_server_pack(pill);
2071         if (rc != 0) {
2072                 CERROR("Can't pack response, rc %d\n", rc);
2073                 RETURN(err_serious(rc));
2074         }
2075
2076         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
2077                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
2078                 LASSERT(repbody);
2079                 repbody->mbo_eadatasize = 0;
2080                 repbody->mbo_aclsize = 0;
2081         }
2082
2083         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
2084
2085         /* for replay no cookkie / lmm need, because client have this already */
2086         if (info->mti_spec.no_create)
2087                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2088                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
2089
2090         rc = mdt_init_ucred_reint(info);
2091         if (rc)
2092                 GOTO(out_shrink, rc);
2093
2094         rc = mdt_fix_attr_ucred(info, op);
2095         if (rc != 0)
2096                 GOTO(out_ucred, rc = err_serious(rc));
2097
2098         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
2099         if (rc < 0) {
2100                 GOTO(out_ucred, rc);
2101         } else if (rc == 1) {
2102                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
2103                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
2104                 GOTO(out_ucred, rc);
2105         }
2106         rc = mdt_reint_rec(info, lhc);
2107         EXIT;
2108 out_ucred:
2109         mdt_exit_ucred(info);
2110 out_shrink:
2111         mdt_client_compatibility(info);
2112         rc2 = mdt_fix_reply(info);
2113         if (rc == 0)
2114                 rc = rc2;
2115         return rc;
2116 }
2117
2118 static long mdt_reint_opcode(struct ptlrpc_request *req,
2119                              const struct req_format **fmt)
2120 {
2121         struct mdt_device       *mdt;
2122         struct mdt_rec_reint    *rec;
2123         long                     opc;
2124
2125         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
2126         if (rec != NULL) {
2127                 opc = rec->rr_opcode;
2128                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
2129                 if (opc < REINT_MAX && fmt[opc] != NULL)
2130                         req_capsule_extend(&req->rq_pill, fmt[opc]);
2131                 else {
2132                         mdt = mdt_exp2dev(req->rq_export);
2133                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
2134                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
2135                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
2136                         opc = err_serious(-EFAULT);
2137                 }
2138         } else {
2139                 opc = err_serious(-EFAULT);
2140         }
2141         return opc;
2142 }
2143
2144 static int mdt_reint(struct tgt_session_info *tsi)
2145 {
2146         long opc;
2147         int  rc;
2148         static const struct req_format *reint_fmts[REINT_MAX] = {
2149                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
2150                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
2151                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
2152                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
2153                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
2154                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
2155                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
2156                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
2157                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME,
2158                 [REINT_RESYNC]   = &RQF_MDS_REINT_RESYNC,
2159         };
2160
2161         ENTRY;
2162
2163         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
2164         if (opc >= 0) {
2165                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2166                 /*
2167                  * No lock possible here from client to pass it to reint code
2168                  * path.
2169                  */
2170                 rc = mdt_reint_internal(info, NULL, opc);
2171                 mdt_thread_info_fini(info);
2172         } else {
2173                 rc = opc;
2174         }
2175
2176         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
2177         RETURN(rc);
2178 }
2179
2180 /* this should sync the whole device */
2181 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
2182 {
2183         struct dt_device *dt = mdt->mdt_bottom;
2184         int rc;
2185         ENTRY;
2186
2187         rc = dt->dd_ops->dt_sync(env, dt);
2188         RETURN(rc);
2189 }
2190
2191 /* this should sync this object */
2192 static int mdt_object_sync(const struct lu_env *env, struct obd_export *exp,
2193                            struct mdt_object *mo)
2194 {
2195         int rc;
2196
2197         ENTRY;
2198
2199         if (!mdt_object_exists(mo)) {
2200                 CWARN("%s: non existing object "DFID": rc = %d\n",
2201                       exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)),
2202                       -ESTALE);
2203                 RETURN(-ESTALE);
2204         }
2205
2206         rc = mo_object_sync(env, mdt_object_child(mo));
2207
2208         RETURN(rc);
2209 }
2210
2211 static int mdt_sync(struct tgt_session_info *tsi)
2212 {
2213         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2214         struct req_capsule      *pill = tsi->tsi_pill;
2215         struct mdt_body         *body;
2216         int                      rc;
2217
2218         ENTRY;
2219
2220         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
2221                 RETURN(err_serious(-ENOMEM));
2222
2223         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
2224                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
2225         } else {
2226                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2227
2228                 /* sync an object */
2229                 rc = mdt_object_sync(tsi->tsi_env, tsi->tsi_exp,
2230                                      info->mti_object);
2231                 if (rc == 0) {
2232                         const struct lu_fid *fid;
2233                         struct lu_attr *la = &info->mti_attr.ma_attr;
2234
2235                         info->mti_attr.ma_need = MA_INODE;
2236                         info->mti_attr.ma_valid = 0;
2237                         rc = mdt_attr_get_complex(info, info->mti_object,
2238                                                   &info->mti_attr);
2239                         if (rc == 0) {
2240                                 body = req_capsule_server_get(pill,
2241                                                               &RMF_MDT_BODY);
2242                                 fid = mdt_object_fid(info->mti_object);
2243                                 mdt_pack_attr2body(info, body, la, fid);
2244                         }
2245                 }
2246                 mdt_thread_info_fini(info);
2247         }
2248         if (rc == 0)
2249                 mdt_counter_incr(req, LPROC_MDT_SYNC);
2250
2251         RETURN(rc);
2252 }
2253
2254 static int mdt_data_sync(struct tgt_session_info *tsi)
2255 {
2256         struct mdt_thread_info *info;
2257         struct mdt_device *mdt = mdt_exp2dev(tsi->tsi_exp);
2258         struct ost_body *body = tsi->tsi_ost_body;
2259         struct ost_body *repbody;
2260         struct mdt_object *mo = NULL;
2261         struct md_attr *ma;
2262         int rc = 0;
2263
2264         ENTRY;
2265
2266         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
2267
2268         /* if no fid is specified then do nothing,
2269          * device sync is done via MDS_SYNC */
2270         if (fid_is_zero(&tsi->tsi_fid))
2271                 RETURN(0);
2272
2273         mo = mdt_object_find(tsi->tsi_env, mdt, &tsi->tsi_fid);
2274         if (IS_ERR(mo))
2275                 RETURN(PTR_ERR(mo));
2276
2277         rc = mdt_object_sync(tsi->tsi_env, tsi->tsi_exp, mo);
2278         if (rc)
2279                 GOTO(put, rc);
2280
2281         repbody->oa.o_oi = body->oa.o_oi;
2282         repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
2283
2284         info = tsi2mdt_info(tsi);
2285         ma = &info->mti_attr;
2286         ma->ma_need = MA_INODE;
2287         ma->ma_valid = 0;
2288         rc = mdt_attr_get_complex(info, mo, ma);
2289         if (rc == 0)
2290                 obdo_from_la(&repbody->oa, &ma->ma_attr, VALID_FLAGS);
2291         else
2292                 rc = 0;
2293         mdt_thread_info_fini(info);
2294
2295         EXIT;
2296 put:
2297         if (mo != NULL)
2298                 mdt_object_put(tsi->tsi_env, mo);
2299         return rc;
2300 }
2301
2302 /*
2303  * Handle quota control requests to consult current usage/limit, but also
2304  * to configure quota enforcement
2305  */
2306 static int mdt_quotactl(struct tgt_session_info *tsi)
2307 {
2308         struct obd_export       *exp  = tsi->tsi_exp;
2309         struct req_capsule      *pill = tsi->tsi_pill;
2310         struct obd_quotactl     *oqctl, *repoqc;
2311         int                      id, rc;
2312         struct mdt_device       *mdt = mdt_exp2dev(exp);
2313         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2314         struct lu_nodemap       *nodemap;
2315         ENTRY;
2316
2317         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2318         if (oqctl == NULL)
2319                 RETURN(err_serious(-EPROTO));
2320
2321         rc = req_capsule_server_pack(pill);
2322         if (rc)
2323                 RETURN(err_serious(rc));
2324
2325         nodemap = nodemap_get_from_exp(exp);
2326         if (IS_ERR(nodemap))
2327                 RETURN(PTR_ERR(nodemap));
2328
2329         switch (oqctl->qc_cmd) {
2330                 /* master quotactl */
2331         case Q_SETINFO:
2332         case Q_SETQUOTA:
2333                 if (!nodemap_can_setquota(nodemap))
2334                         GOTO(out_nodemap, rc = -EPERM);
2335         case Q_GETINFO:
2336         case Q_GETQUOTA:
2337                 if (qmt == NULL)
2338                         GOTO(out_nodemap, rc = -EOPNOTSUPP);
2339                 /* slave quotactl */
2340         case Q_GETOINFO:
2341         case Q_GETOQUOTA:
2342                 break;
2343         default:
2344                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2345                 GOTO(out_nodemap, rc = -EFAULT);
2346         }
2347
2348         id = oqctl->qc_id;
2349         switch (oqctl->qc_type) {
2350         case USRQUOTA:
2351                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2352                                     NODEMAP_CLIENT_TO_FS, id);
2353                 break;
2354         case GRPQUOTA:
2355                 id = nodemap_map_id(nodemap, NODEMAP_GID,
2356                                     NODEMAP_CLIENT_TO_FS, id);
2357                 break;
2358         case PRJQUOTA:
2359                 /* todo: check/map project id */
2360                 id = oqctl->qc_id;
2361                 break;
2362         default:
2363                 GOTO(out_nodemap, rc = -EOPNOTSUPP);
2364         }
2365         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2366         if (repoqc == NULL)
2367                 GOTO(out_nodemap, rc = err_serious(-EFAULT));
2368
2369         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA)
2370                 barrier_exit(tsi->tsi_tgt->lut_bottom);
2371
2372         if (oqctl->qc_id != id)
2373                 swap(oqctl->qc_id, id);
2374
2375         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA) {
2376                 if (unlikely(!barrier_entry(tsi->tsi_tgt->lut_bottom)))
2377                         RETURN(-EINPROGRESS);
2378         }
2379
2380         switch (oqctl->qc_cmd) {
2381
2382         case Q_GETINFO:
2383         case Q_SETINFO:
2384         case Q_SETQUOTA:
2385         case Q_GETQUOTA:
2386                 /* forward quotactl request to QMT */
2387                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2388                 break;
2389
2390         case Q_GETOINFO:
2391         case Q_GETOQUOTA:
2392                 /* slave quotactl */
2393                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2394                                    oqctl);
2395                 break;
2396
2397         default:
2398                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2399                 GOTO(out_nodemap, rc = -EFAULT);
2400         }
2401
2402         if (oqctl->qc_id != id)
2403                 swap(oqctl->qc_id, id);
2404
2405         *repoqc = *oqctl;
2406
2407         EXIT;
2408
2409 out_nodemap:
2410         nodemap_putref(nodemap);
2411
2412         return rc;
2413 }
2414
2415 /** clone llog ctxt from child (mdd)
2416  * This allows remote llog (replicator) access.
2417  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2418  * context was originally set up, or we can handle them directly.
2419  * I choose the latter, but that means I need any llog
2420  * contexts set up by child to be accessable by the mdt.  So we clone the
2421  * context into our context list here.
2422  */
2423 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2424                                int idx)
2425 {
2426         struct md_device  *next = mdt->mdt_child;
2427         struct llog_ctxt *ctxt;
2428         int rc;
2429
2430         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2431                 return 0;
2432
2433         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2434         if (rc || ctxt == NULL) {
2435                 return 0;
2436         }
2437
2438         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2439         if (rc)
2440                 CERROR("Can't set mdt ctxt %d\n", rc);
2441
2442         return rc;
2443 }
2444
2445 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2446                                  struct mdt_device *mdt, int idx)
2447 {
2448         struct llog_ctxt *ctxt;
2449
2450         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2451         if (ctxt == NULL)
2452                 return 0;
2453         /* Put once for the get we just did, and once for the clone */
2454         llog_ctxt_put(ctxt);
2455         llog_ctxt_put(ctxt);
2456         return 0;
2457 }
2458
2459 /*
2460  * sec context handlers
2461  */
2462 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2463 {
2464         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2465
2466         return 0;
2467 }
2468
2469 /*
2470  * quota request handlers
2471  */
2472 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2473 {
2474         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2475         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2476         int                      rc;
2477         ENTRY;
2478
2479         if (qmt == NULL)
2480                 RETURN(err_serious(-EOPNOTSUPP));
2481
2482         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2483         RETURN(rc);
2484 }
2485
2486 struct mdt_object *mdt_object_new(const struct lu_env *env,
2487                                   struct mdt_device *d,
2488                                   const struct lu_fid *f)
2489 {
2490         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2491         struct lu_object *o;
2492         struct mdt_object *m;
2493         ENTRY;
2494
2495         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2496         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2497         if (unlikely(IS_ERR(o)))
2498                 m = (struct mdt_object *)o;
2499         else
2500                 m = mdt_obj(o);
2501         RETURN(m);
2502 }
2503
2504 struct mdt_object *mdt_object_find(const struct lu_env *env,
2505                                    struct mdt_device *d,
2506                                    const struct lu_fid *f)
2507 {
2508         struct lu_object *o;
2509         struct mdt_object *m;
2510         ENTRY;
2511
2512         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2513         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2514         if (unlikely(IS_ERR(o)))
2515                 m = (struct mdt_object *)o;
2516         else
2517                 m = mdt_obj(o);
2518
2519         RETURN(m);
2520 }
2521
2522 /**
2523  * Asyncronous commit for mdt device.
2524  *
2525  * Pass asynchonous commit call down the MDS stack.
2526  *
2527  * \param env environment
2528  * \param mdt the mdt device
2529  */
2530 static void mdt_device_commit_async(const struct lu_env *env,
2531                                     struct mdt_device *mdt)
2532 {
2533         struct dt_device *dt = mdt->mdt_bottom;
2534         int rc;
2535         ENTRY;
2536
2537         rc = dt->dd_ops->dt_commit_async(env, dt);
2538         if (unlikely(rc != 0))
2539                 CWARN("%s: async commit start failed: rc = %d\n",
2540                       mdt_obd_name(mdt), rc);
2541         atomic_inc(&mdt->mdt_async_commit_count);
2542         EXIT;
2543 }
2544
2545 /**
2546  * Mark the lock as "synchonous".
2547  *
2548  * Mark the lock to deffer transaction commit to the unlock time.
2549  *
2550  * \param lock the lock to mark as "synchonous"
2551  *
2552  * \see mdt_is_lock_sync
2553  * \see mdt_save_lock
2554  */
2555 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2556 {
2557         lock->l_ast_data = (void*)1;
2558 }
2559
2560 /**
2561  * Check whehter the lock "synchonous" or not.
2562  *
2563  * \param lock the lock to check
2564  * \retval 1 the lock is "synchonous"
2565  * \retval 0 the lock isn't "synchronous"
2566  *
2567  * \see mdt_set_lock_sync
2568  * \see mdt_save_lock
2569  */
2570 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2571 {
2572         return lock->l_ast_data != NULL;
2573 }
2574
2575 /**
2576  * Blocking AST for mdt locks.
2577  *
2578  * Starts transaction commit if in case of COS lock conflict or
2579  * deffers such a commit to the mdt_save_lock.
2580  *
2581  * \param lock the lock which blocks a request or cancelling lock
2582  * \param desc unused
2583  * \param data unused
2584  * \param flag indicates whether this cancelling or blocking callback
2585  * \retval 0
2586  * \see ldlm_blocking_ast_nocheck
2587  */
2588 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2589                      void *data, int flag)
2590 {
2591         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2592         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2593         bool commit_async = false;
2594         int rc;
2595         ENTRY;
2596
2597         if (flag == LDLM_CB_CANCELING)
2598                 RETURN(0);
2599
2600         lock_res_and_lock(lock);
2601         if (lock->l_blocking_ast != mdt_blocking_ast) {
2602                 unlock_res_and_lock(lock);
2603                 RETURN(0);
2604         }
2605         /* There is no lock conflict if l_blocking_lock == NULL,
2606          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2607          * when the last reference to a local lock was released */
2608         if (lock->l_req_mode & (LCK_PW | LCK_EX) &&
2609             lock->l_blocking_lock != NULL) {
2610                 if (mdt_cos_is_enabled(mdt)) {
2611                         if (lock->l_client_cookie !=
2612                             lock->l_blocking_lock->l_client_cookie)
2613                                 mdt_set_lock_sync(lock);
2614                 } else if (mdt_slc_is_enabled(mdt) &&
2615                            ldlm_is_cos_incompat(lock->l_blocking_lock)) {
2616                         mdt_set_lock_sync(lock);
2617                         /*
2618                          * we may do extra commit here, but there is a small
2619                          * window to miss a commit: lock was unlocked (saved),
2620                          * then a conflict lock queued and we come here, but
2621                          * REP-ACK not received, so lock was not converted to
2622                          * COS mode yet.
2623                          * Fortunately this window is quite small, so the
2624                          * extra commit should be rare (not to say distributed
2625                          * operation is rare too).
2626                          */
2627                         commit_async = true;
2628                 }
2629         } else if (lock->l_req_mode == LCK_COS &&
2630                    lock->l_blocking_lock != NULL) {
2631                 commit_async = true;
2632         }
2633
2634         rc = ldlm_blocking_ast_nocheck(lock);
2635
2636         if (commit_async) {
2637                 struct lu_env env;
2638
2639                 rc = lu_env_init(&env, LCT_LOCAL);
2640                 if (unlikely(rc != 0))
2641                         CWARN("%s: lu_env initialization failed, cannot "
2642                               "start asynchronous commit: rc = %d\n",
2643                               obd->obd_name, rc);
2644                 else
2645                         mdt_device_commit_async(&env, mdt);
2646                 lu_env_fini(&env);
2647         }
2648         RETURN(rc);
2649 }
2650
2651 /*
2652  * Blocking AST for cross-MDT lock
2653  *
2654  * Discard lock from uncommitted_slc_locks and cancel it.
2655  *
2656  * \param lock  the lock which blocks a request or cancelling lock
2657  * \param desc  unused
2658  * \param data  unused
2659  * \param flag  indicates whether this cancelling or blocking callback
2660  * \retval      0 on success
2661  * \retval      negative number on error
2662  */
2663 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2664                             void *data, int flag)
2665 {
2666         int rc = 0;
2667         ENTRY;
2668
2669         switch (flag) {
2670         case LDLM_CB_BLOCKING: {
2671                 struct lustre_handle lockh;
2672
2673                 ldlm_lock2handle(lock, &lockh);
2674                 rc = ldlm_cli_cancel(&lockh,
2675                         ldlm_is_atomic_cb(lock) ? 0 : LCF_ASYNC);
2676                 if (rc < 0) {
2677                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2678                         RETURN(rc);
2679                 }
2680                 break;
2681         }
2682         case LDLM_CB_CANCELING: {
2683                 struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2684                 struct mdt_device *mdt =
2685                                 mdt_dev(obd->obd_lu_dev->ld_site->ls_top_dev);
2686
2687                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2688
2689                 /* discard slc lock here so that it can be cleaned anytime,
2690                  * especially for cleanup_resource() */
2691                 tgt_discard_slc_lock(&mdt->mdt_lut, lock);
2692
2693                 /* once we cache lock, l_ast_data is set to mdt_object */
2694                 if (lock->l_ast_data != NULL) {
2695                         struct mdt_object *mo = lock->l_ast_data;
2696                         struct lu_env env;
2697
2698                         rc = lu_env_init(&env, LCT_MD_THREAD);
2699                         if (unlikely(rc != 0)) {
2700                                 CWARN("%s: lu_env initialization failed, object"
2701                                       "%p "DFID" is leaked!\n",
2702                                       obd->obd_name, mo,
2703                                       PFID(mdt_object_fid(mo)));
2704                                 RETURN(rc);
2705                         }
2706
2707                         if (lock->l_policy_data.l_inodebits.bits &
2708                             (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)) {
2709                                 rc = mo_invalidate(&env, mdt_object_child(mo));
2710                                 mo->mot_cache_attr = 0;
2711                         }
2712                         mdt_object_put(&env, mo);
2713                         lu_env_fini(&env);
2714                 }
2715                 break;
2716         }
2717         default:
2718                 LBUG();
2719         }
2720
2721         RETURN(rc);
2722 }
2723
2724 int mdt_check_resent_lock(struct mdt_thread_info *info,
2725                           struct mdt_object *mo,
2726                           struct mdt_lock_handle *lhc)
2727 {
2728         /* the lock might already be gotten in ldlm_handle_enqueue() */
2729         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2730                 struct ptlrpc_request *req = mdt_info_req(info);
2731                 struct ldlm_lock      *lock;
2732
2733                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2734                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2735                 if (lock == NULL) {
2736                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2737                          * a resend case, however, it could be already destroyed
2738                          * due to client eviction or a raced cancel RPC. */
2739                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx",
2740                                           lhc->mlh_reg_lh.cookie);
2741                         RETURN(-ESTALE);
2742                 }
2743
2744                 if (!fid_res_name_eq(mdt_object_fid(mo),
2745                                      &lock->l_resource->lr_name)) {
2746                         CWARN("%s: Although resent, but still not "
2747                               "get child lock:"DFID"\n",
2748                               info->mti_exp->exp_obd->obd_name,
2749                               PFID(mdt_object_fid(mo)));
2750                         LDLM_LOCK_PUT(lock);
2751                         RETURN(-EPROTO);
2752                 }
2753                 LDLM_LOCK_PUT(lock);
2754                 return 0;
2755         }
2756         return 1;
2757 }
2758
2759 int mdt_remote_object_lock_try(struct mdt_thread_info *mti,
2760                                struct mdt_object *o, const struct lu_fid *fid,
2761                                struct lustre_handle *lh, enum ldlm_mode mode,
2762                                __u64 *ibits, __u64 trybits, bool cache)
2763 {
2764         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2765         union ldlm_policy_data *policy = &mti->mti_policy;
2766         struct ldlm_res_id *res_id = &mti->mti_res_id;
2767         int rc = 0;
2768         ENTRY;
2769
2770         LASSERT(mdt_object_remote(o));
2771
2772         fid_build_reg_res_name(fid, res_id);
2773
2774         memset(einfo, 0, sizeof(*einfo));
2775         einfo->ei_type = LDLM_IBITS;
2776         einfo->ei_mode = mode;
2777         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2778         einfo->ei_cb_cp = ldlm_completion_ast;
2779         einfo->ei_enq_slave = 0;
2780         einfo->ei_res_id = res_id;
2781
2782         if (cache) {
2783                 /*
2784                  * if we cache lock, couple lock with mdt_object, so that object
2785                  * can be easily found in lock ASTs.
2786                  */
2787                 mdt_object_get(mti->mti_env, o);
2788                 einfo->ei_cbdata = o;
2789         }
2790
2791
2792         memset(policy, 0, sizeof(*policy));
2793         policy->l_inodebits.bits = *ibits;
2794         policy->l_inodebits.try_bits = trybits;
2795
2796         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2797                             policy);
2798         if (rc < 0 && cache) {
2799                 mdt_object_put(mti->mti_env, o);
2800                 einfo->ei_cbdata = NULL;
2801         }
2802
2803         /* Return successfully acquired bits to a caller */
2804         if (rc == 0) {
2805                 struct ldlm_lock *lock = ldlm_handle2lock(lh);
2806
2807                 LASSERT(lock);
2808                 *ibits = lock->l_policy_data.l_inodebits.bits;
2809                 LDLM_LOCK_PUT(lock);
2810         }
2811         RETURN(rc);
2812 }
2813
2814 int mdt_remote_object_lock(struct mdt_thread_info *mti, struct mdt_object *o,
2815                            const struct lu_fid *fid, struct lustre_handle *lh,
2816                            enum ldlm_mode mode, __u64 ibits, bool cache)
2817 {
2818         return mdt_remote_object_lock_try(mti, o, fid, lh, mode, &ibits, 0,
2819                                           cache);
2820 }
2821
2822 static int mdt_object_local_lock(struct mdt_thread_info *info,
2823                                  struct mdt_object *o,
2824                                  struct mdt_lock_handle *lh, __u64 *ibits,
2825                                  __u64 trybits, bool cos_incompat)
2826 {
2827         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2828         union ldlm_policy_data *policy = &info->mti_policy;
2829         struct ldlm_res_id *res_id = &info->mti_res_id;
2830         __u64 dlmflags = 0;
2831         int rc;
2832         ENTRY;
2833
2834         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2835         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2836         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2837         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2838
2839         if (cos_incompat) {
2840                 LASSERT(lh->mlh_reg_mode == LCK_PW ||
2841                         lh->mlh_reg_mode == LCK_EX);
2842                 dlmflags |= LDLM_FL_COS_INCOMPAT;
2843         } else if (mdt_cos_is_enabled(info->mti_mdt)) {
2844                 dlmflags |= LDLM_FL_COS_ENABLED;
2845         }
2846
2847         /* Only enqueue LOOKUP lock for remote object */
2848         LASSERT(ergo(mdt_object_remote(o), *ibits == MDS_INODELOCK_LOOKUP));
2849
2850         if (lh->mlh_type == MDT_PDO_LOCK) {
2851                 /* check for exists after object is locked */
2852                 if (mdt_object_exists(o) == 0) {
2853                         /* Non-existent object shouldn't have PDO lock */
2854                         RETURN(-ESTALE);
2855                 } else {
2856                         /* Non-dir object shouldn't have PDO lock */
2857                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2858                                 RETURN(-ENOTDIR);
2859                 }
2860         }
2861
2862
2863         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2864         dlmflags |= LDLM_FL_ATOMIC_CB;
2865
2866         /*
2867          * Take PDO lock on whole directory and build correct @res_id for lock
2868          * on part of directory.
2869          */
2870         if (lh->mlh_pdo_hash != 0) {
2871                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2872                 mdt_lock_pdo_mode(info, o, lh);
2873                 if (lh->mlh_pdo_mode != LCK_NL) {
2874                         /*
2875                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2876                          * is never going to be sent to client and we do not
2877                          * want it slowed down due to possible cancels.
2878                          */
2879                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2880                         policy->l_inodebits.try_bits = 0;
2881                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2882                                           policy, res_id, dlmflags,
2883                                           info->mti_exp == NULL ? NULL :
2884                                           &info->mti_exp->exp_handle.h_cookie);
2885                         if (unlikely(rc != 0))
2886                                 GOTO(out_unlock, rc);
2887                 }
2888
2889                 /*
2890                  * Finish res_id initializing by name hash marking part of
2891                  * directory which is taking modification.
2892                  */
2893                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2894         }
2895
2896         policy->l_inodebits.bits = *ibits;
2897         policy->l_inodebits.try_bits = trybits;
2898
2899         /*
2900          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2901          * going to be sent to client. If it is - mdt_intent_policy() path will
2902          * fix it up and turn FL_LOCAL flag off.
2903          */
2904         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2905                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2906                           info->mti_exp == NULL ? NULL :
2907                           &info->mti_exp->exp_handle.h_cookie);
2908 out_unlock:
2909         if (rc != 0)
2910                 mdt_object_unlock(info, o, lh, 1);
2911         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2912                    lh->mlh_pdo_hash != 0 &&
2913                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2914                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2915
2916         /* Return successfully acquired bits to a caller */
2917         if (rc == 0) {
2918                 struct ldlm_lock *lock = ldlm_handle2lock(&lh->mlh_reg_lh);
2919
2920                 LASSERT(lock);
2921                 *ibits = lock->l_policy_data.l_inodebits.bits;
2922                 LDLM_LOCK_PUT(lock);
2923         }
2924         RETURN(rc);
2925 }
2926
2927 static int
2928 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2929                          struct mdt_lock_handle *lh, __u64 *ibits,
2930                          __u64 trybits, bool cos_incompat)
2931 {
2932         struct mdt_lock_handle *local_lh = NULL;
2933         int rc;
2934         ENTRY;
2935
2936         if (!mdt_object_remote(o)) {
2937                 rc = mdt_object_local_lock(info, o, lh, ibits, trybits,
2938                                            cos_incompat);
2939                 RETURN(rc);
2940         }
2941
2942         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2943         *ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2944                     MDS_INODELOCK_XATTR);
2945
2946         /* Only enqueue LOOKUP lock for remote object */
2947         if (*ibits & MDS_INODELOCK_LOOKUP) {
2948                 __u64 local = MDS_INODELOCK_LOOKUP;
2949
2950                 rc = mdt_object_local_lock(info, o, lh, &local, 0,
2951                                            cos_incompat);
2952                 if (rc != ELDLM_OK)
2953                         RETURN(rc);
2954
2955                 local_lh = lh;
2956         }
2957
2958         if ((*ibits | trybits) & MDS_INODELOCK_UPDATE) {
2959                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2960                  * enqueue RPC can only request 1 lock, to avoid extra
2961                  * RPC, so it will instead enqueue EX lock for remote
2962                  * object anyway XXX*/
2963                 if (lh->mlh_type == MDT_PDO_LOCK &&
2964                     lh->mlh_pdo_hash != 0) {
2965                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2966                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2967                                PFID(mdt_object_fid(o)));
2968                         lh->mlh_pdo_hash = 0;
2969                         lh->mlh_rreg_mode = LCK_EX;
2970                         lh->mlh_type = MDT_REG_LOCK;
2971                 }
2972
2973                 rc = mdt_remote_object_lock_try(info, o, mdt_object_fid(o),
2974                                                 &lh->mlh_rreg_lh,
2975                                                 lh->mlh_rreg_mode,
2976                                                 ibits, trybits, false);
2977                 if (rc != ELDLM_OK) {
2978                         if (local_lh != NULL)
2979                                 mdt_object_unlock(info, o, local_lh, rc);
2980                         RETURN(rc);
2981                 }
2982         }
2983
2984         RETURN(0);
2985 }
2986
2987 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2988                     struct mdt_lock_handle *lh, __u64 ibits)
2989 {
2990         return mdt_object_lock_internal(info, o, lh, &ibits, 0, false);
2991 }
2992
2993 int mdt_reint_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2994                           struct mdt_lock_handle *lh, __u64 ibits,
2995                           bool cos_incompat)
2996 {
2997         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2998         return mdt_object_lock_internal(info, o, lh, &ibits, 0,
2999                                         cos_incompat);
3000 }
3001
3002 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
3003                         struct mdt_lock_handle *lh, __u64 *ibits,
3004                         __u64 trybits, bool cos_incompat)
3005 {
3006         bool trylock_only = *ibits == 0;
3007         int rc;
3008
3009         LASSERT(!(*ibits & trybits));
3010         rc = mdt_object_lock_internal(info, o, lh, ibits, trybits,
3011                                       cos_incompat);
3012         if (rc && trylock_only) { /* clear error for try ibits lock only */
3013                 LASSERT(*ibits == 0);
3014                 rc = 0;
3015         }
3016         return rc;
3017 }
3018
3019 /**
3020  * Save a lock within request object.
3021  *
3022  * Keep the lock referenced until whether client ACK or transaction
3023  * commit happens or release the lock immediately depending on input
3024  * parameters. If COS is ON, a write lock is converted to COS lock
3025  * before saving.
3026  *
3027  * \param info thead info object
3028  * \param h lock handle
3029  * \param mode lock mode
3030  * \param decref force immediate lock releasing
3031  */
3032 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
3033                    enum ldlm_mode mode, int decref)
3034 {
3035         ENTRY;
3036
3037         if (lustre_handle_is_used(h)) {
3038                 if (decref || !info->mti_has_trans ||
3039                     !(mode & (LCK_PW | LCK_EX))) {
3040                         mdt_fid_unlock(h, mode);
3041                 } else {
3042                         struct mdt_device *mdt = info->mti_mdt;
3043                         struct ldlm_lock *lock = ldlm_handle2lock(h);
3044                         struct ptlrpc_request *req = mdt_info_req(info);
3045                         bool cos = mdt_cos_is_enabled(mdt);
3046                         bool convert_lock = !cos && mdt_slc_is_enabled(mdt);
3047
3048                         LASSERTF(lock != NULL, "no lock for cookie %#llx\n",
3049                                  h->cookie);
3050
3051                         /* there is no request if mdt_object_unlock() is called
3052                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
3053                         if (likely(req != NULL)) {
3054                                 LDLM_DEBUG(lock, "save lock request %p reply "
3055                                         "state %p transno %lld\n", req,
3056                                         req->rq_reply_state, req->rq_transno);
3057                                 if (cos) {
3058                                         ldlm_lock_mode_downgrade(lock, LCK_COS);
3059                                         mode = LCK_COS;
3060                                 }
3061                                 if (req->rq_export->exp_disconnected)
3062                                         mdt_fid_unlock(h, mode);
3063                                 else
3064                                         ptlrpc_save_lock(req, h, mode, cos,
3065                                                          convert_lock);
3066                         } else {
3067                                 mdt_fid_unlock(h, mode);
3068                         }
3069                         if (mdt_is_lock_sync(lock)) {
3070                                 CDEBUG(D_HA, "found sync-lock,"
3071                                        " async commit started\n");
3072                                 mdt_device_commit_async(info->mti_env,
3073                                                         mdt);
3074                         }
3075                         LDLM_LOCK_PUT(lock);
3076                 }
3077                 h->cookie = 0ull;
3078         }
3079
3080         EXIT;
3081 }
3082
3083 /**
3084  * Save cross-MDT lock in uncommitted_slc_locks
3085  *
3086  * Keep the lock referenced until transaction commit happens or release the lock
3087  * immediately depending on input parameters.
3088  *
3089  * \param info thead info object
3090  * \param h lock handle
3091  * \param mode lock mode
3092  * \param decref force immediate lock releasing
3093  */
3094 static void mdt_save_remote_lock(struct mdt_thread_info *info,
3095                                  struct mdt_object *o, struct lustre_handle *h,
3096                                  enum ldlm_mode mode, int decref)
3097 {
3098         ENTRY;
3099
3100         if (lustre_handle_is_used(h)) {
3101                 struct ldlm_lock *lock = ldlm_handle2lock(h);
3102
3103                 if (o != NULL &&
3104                     (lock->l_policy_data.l_inodebits.bits &
3105                      (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)))
3106                         mo_invalidate(info->mti_env, mdt_object_child(o));
3107
3108                 if (decref || !info->mti_has_trans ||
3109                     !(mode & (LCK_PW | LCK_EX))) {
3110                         ldlm_lock_decref_and_cancel(h, mode);
3111                         LDLM_LOCK_PUT(lock);
3112                 } else {
3113                         struct ptlrpc_request *req = mdt_info_req(info);
3114
3115                         LASSERT(req != NULL);
3116                         tgt_save_slc_lock(&info->mti_mdt->mdt_lut, lock,
3117                                           req->rq_transno);
3118                         ldlm_lock_decref(h, mode);
3119                 }
3120                 h->cookie = 0ull;
3121         }
3122
3123         EXIT;
3124 }
3125
3126 /**
3127  * Unlock mdt object.
3128  *
3129  * Immeditely release the regular lock and the PDO lock or save the
3130  * lock in request and keep them referenced until client ACK or
3131  * transaction commit.
3132  *
3133  * \param info thread info object
3134  * \param o mdt object
3135  * \param lh mdt lock handle referencing regular and PDO locks
3136  * \param decref force immediate lock releasing
3137  *
3138  * XXX o is not used and may be NULL, see hsm_cdt_request_completed().
3139  */
3140 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
3141                        struct mdt_lock_handle *lh, int decref)
3142 {
3143         ENTRY;
3144
3145         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
3146         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
3147         mdt_save_remote_lock(info, o, &lh->mlh_rreg_lh, lh->mlh_rreg_mode,
3148                              decref);
3149
3150         EXIT;
3151 }
3152
3153 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
3154                                         const struct lu_fid *f,
3155                                         struct mdt_lock_handle *lh,
3156                                         __u64 ibits)
3157 {
3158         struct mdt_object *o;
3159
3160         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
3161         if (!IS_ERR(o)) {
3162                 int rc;
3163
3164                 rc = mdt_object_lock(info, o, lh, ibits);
3165                 if (rc != 0) {
3166                         mdt_object_put(info->mti_env, o);
3167                         o = ERR_PTR(rc);
3168                 }
3169         }
3170         return o;
3171 }
3172
3173 void mdt_object_unlock_put(struct mdt_thread_info * info,
3174                            struct mdt_object * o,
3175                            struct mdt_lock_handle *lh,
3176                            int decref)
3177 {
3178         mdt_object_unlock(info, o, lh, decref);
3179         mdt_object_put(info->mti_env, o);
3180 }
3181
3182 /*
3183  * Generic code handling requests that have struct mdt_body passed in:
3184  *
3185  *  - extract mdt_body from request and save it in @info, if present;
3186  *
3187  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
3188  *  @info;
3189  *
3190  *  - if HABEO_CORPUS flag is set for this request type check whether object
3191  *  actually exists on storage (lu_object_exists()).
3192  *
3193  */
3194 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
3195 {
3196         const struct mdt_body    *body;
3197         struct mdt_object        *obj;
3198         const struct lu_env      *env;
3199         struct req_capsule       *pill;
3200         int                       rc;
3201         ENTRY;
3202
3203         env = info->mti_env;
3204         pill = info->mti_pill;
3205
3206         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
3207         if (body == NULL)
3208                 RETURN(-EFAULT);
3209
3210         if (!(body->mbo_valid & OBD_MD_FLID))
3211                 RETURN(0);
3212
3213         if (!fid_is_sane(&body->mbo_fid1)) {
3214                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
3215                 RETURN(-EINVAL);
3216         }
3217
3218         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
3219         if (!IS_ERR(obj)) {
3220                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
3221                         mdt_object_put(env, obj);
3222                         rc = -ENOENT;
3223                 } else {
3224                         info->mti_object = obj;
3225                         rc = 0;
3226                 }
3227         } else
3228                 rc = PTR_ERR(obj);
3229
3230         RETURN(rc);
3231 }
3232
3233 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
3234 {
3235         struct req_capsule *pill = info->mti_pill;
3236         int rc;
3237         ENTRY;
3238
3239         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
3240                 rc = mdt_body_unpack(info, flags);
3241         else
3242                 rc = 0;
3243
3244         if (rc == 0 && (flags & HABEO_REFERO)) {
3245                 /* Pack reply. */
3246                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
3247                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
3248                                              DEF_REP_MD_SIZE);
3249                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
3250                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
3251                                              RCL_SERVER, 0);
3252
3253                 /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
3254                  * by default. If the target object has more ACL entries, then
3255                  * enlarge the buffer when necessary. */
3256                 if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
3257                         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
3258                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
3259
3260                 rc = req_capsule_server_pack(pill);
3261         }
3262         RETURN(rc);
3263 }
3264
3265 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
3266 {
3267         lh->mlh_type = MDT_NUL_LOCK;
3268         lh->mlh_reg_lh.cookie = 0ull;
3269         lh->mlh_reg_mode = LCK_MINMODE;
3270         lh->mlh_pdo_lh.cookie = 0ull;
3271         lh->mlh_pdo_mode = LCK_MINMODE;
3272         lh->mlh_rreg_lh.cookie = 0ull;
3273         lh->mlh_rreg_mode = LCK_MINMODE;
3274 }
3275
3276 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
3277 {
3278         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
3279         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
3280 }
3281
3282 /*
3283  * Initialize fields of struct mdt_thread_info. Other fields are left in
3284  * uninitialized state, because it's too expensive to zero out whole
3285  * mdt_thread_info (> 1K) on each request arrival.
3286  */
3287 void mdt_thread_info_init(struct ptlrpc_request *req,
3288                           struct mdt_thread_info *info)
3289 {
3290         int i;
3291
3292         info->mti_pill = &req->rq_pill;
3293
3294         /* lock handle */
3295         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3296                 mdt_lock_handle_init(&info->mti_lh[i]);
3297
3298         /* mdt device: it can be NULL while CONNECT */
3299         if (req->rq_export) {
3300                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
3301                 info->mti_exp = req->rq_export;
3302         } else
3303                 info->mti_mdt = NULL;
3304         info->mti_env = req->rq_svc_thread->t_env;
3305         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
3306
3307         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
3308         info->mti_big_buf = LU_BUF_NULL;
3309         info->mti_body = NULL;
3310         info->mti_object = NULL;
3311         info->mti_dlm_req = NULL;
3312         info->mti_has_trans = 0;
3313         info->mti_cross_ref = 0;
3314         info->mti_opdata = 0;
3315         info->mti_big_lmm_used = 0;
3316         info->mti_big_acl_used = 0;
3317         info->mti_som_valid = 0;
3318
3319         info->mti_spec.no_create = 0;
3320         info->mti_spec.sp_rm_entry = 0;
3321         info->mti_spec.sp_permitted = 0;
3322         info->mti_spec.sp_migrate_close = 0;
3323
3324         info->mti_spec.u.sp_ea.eadata = NULL;
3325         info->mti_spec.u.sp_ea.eadatalen = 0;
3326 }
3327
3328 void mdt_thread_info_fini(struct mdt_thread_info *info)
3329 {
3330         int i;
3331
3332         if (info->mti_object != NULL) {
3333                 mdt_object_put(info->mti_env, info->mti_object);
3334                 info->mti_object = NULL;
3335         }
3336
3337         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3338                 mdt_lock_handle_fini(&info->mti_lh[i]);
3339         info->mti_env = NULL;
3340         info->mti_pill = NULL;
3341         info->mti_exp = NULL;
3342
3343         if (unlikely(info->mti_big_buf.lb_buf != NULL))
3344                 lu_buf_free(&info->mti_big_buf);
3345 }
3346
3347 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
3348 {
3349         struct mdt_thread_info  *mti;
3350
3351         mti = mdt_th_info(tsi->tsi_env);
3352         LASSERT(mti != NULL);
3353
3354         mdt_thread_info_init(tgt_ses_req(tsi), mti);
3355         if (tsi->tsi_corpus != NULL) {
3356                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
3357                 lu_object_get(tsi->tsi_corpus);
3358         }
3359         mti->mti_body = tsi->tsi_mdt_body;
3360         mti->mti_dlm_req = tsi->tsi_dlm_req;
3361
3362         return mti;
3363 }
3364
3365 static int mdt_tgt_connect(struct tgt_session_info *tsi)
3366 {
3367         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
3368             cfs_fail_val ==
3369             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
3370                 set_current_state(TASK_UNINTERRUPTIBLE);
3371                 schedule_timeout(msecs_to_jiffies(3 * MSEC_PER_SEC));
3372         }
3373
3374         return tgt_connect(tsi);
3375 }
3376
3377 enum mdt_it_code {
3378         MDT_IT_OPEN,
3379         MDT_IT_OCREAT,
3380         MDT_IT_CREATE,
3381         MDT_IT_GETATTR,
3382         MDT_IT_READDIR,
3383         MDT_IT_LOOKUP,
3384         MDT_IT_UNLINK,
3385         MDT_IT_TRUNC,
3386         MDT_IT_GETXATTR,
3387         MDT_IT_LAYOUT,
3388         MDT_IT_QUOTA,
3389         MDT_IT_GLIMPSE,
3390         MDT_IT_BRW,
3391         MDT_IT_NR
3392 };
3393
3394 static int mdt_intent_getattr(enum mdt_it_code opcode,
3395                               struct mdt_thread_info *info,
3396                               struct ldlm_lock **, __u64);
3397
3398 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3399                                 struct mdt_thread_info *info,
3400                                 struct ldlm_lock **lockp,
3401                                 __u64 flags);
3402
3403 static int mdt_intent_layout(enum mdt_it_code opcode,
3404                              struct mdt_thread_info *info,
3405                              struct ldlm_lock **,
3406                              __u64);
3407 static int mdt_intent_reint(enum mdt_it_code opcode,
3408                             struct mdt_thread_info *info,
3409                             struct ldlm_lock **,
3410                             __u64);
3411 static int mdt_intent_glimpse(enum mdt_it_code opcode,
3412                               struct mdt_thread_info *info,
3413                               struct ldlm_lock **lockp, __u64 flags)
3414 {
3415         return mdt_glimpse_enqueue(info, info->mti_mdt->mdt_namespace,
3416                                    lockp, flags);
3417 }
3418 static int mdt_intent_brw(enum mdt_it_code opcode,
3419                           struct mdt_thread_info *info,
3420                           struct ldlm_lock **lockp, __u64 flags)
3421 {
3422         return mdt_brw_enqueue(info, info->mti_mdt->mdt_namespace,
3423                                lockp, flags);
3424 }
3425
3426 static struct mdt_it_flavor {
3427         const struct req_format *it_fmt;
3428         __u32                    it_flags;
3429         int                    (*it_act)(enum mdt_it_code ,
3430                                          struct mdt_thread_info *,
3431                                          struct ldlm_lock **,
3432                                          __u64);
3433         long                     it_reint;
3434 } mdt_it_flavor[] = {
3435         [MDT_IT_OPEN]     = {
3436                 .it_fmt   = &RQF_LDLM_INTENT,
3437                 /*.it_flags = HABEO_REFERO,*/
3438                 .it_flags = 0,
3439                 .it_act   = mdt_intent_reint,
3440                 .it_reint = REINT_OPEN
3441         },
3442         [MDT_IT_OCREAT]   = {
3443                 .it_fmt   = &RQF_LDLM_INTENT,
3444                 /*
3445                  * OCREAT is not a MUTABOR request as if the file
3446                  * already exists.
3447                  * We do the extra check of OBD_CONNECT_RDONLY in
3448                  * mdt_reint_open() when we really need to create
3449                  * the object.
3450                  */
3451                 .it_flags = 0,
3452                 .it_act   = mdt_intent_reint,
3453                 .it_reint = REINT_OPEN
3454         },
3455         [MDT_IT_CREATE]   = {
3456                 .it_fmt   = &RQF_LDLM_INTENT,
3457                 .it_flags = MUTABOR,
3458                 .it_act   = mdt_intent_reint,
3459                 .it_reint = REINT_CREATE
3460         },
3461         [MDT_IT_GETATTR]  = {
3462                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3463                 .it_flags = HABEO_REFERO,
3464                 .it_act   = mdt_intent_getattr
3465         },
3466         [MDT_IT_READDIR]  = {
3467                 .it_fmt   = NULL,
3468                 .it_flags = 0,
3469                 .it_act   = NULL
3470         },
3471         [MDT_IT_LOOKUP]   = {
3472                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3473                 .it_flags = HABEO_REFERO,
3474                 .it_act   = mdt_intent_getattr
3475         },
3476         [MDT_IT_UNLINK]   = {
3477                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
3478                 .it_flags = MUTABOR,
3479                 .it_act   = NULL,
3480                 .it_reint = REINT_UNLINK
3481         },
3482         [MDT_IT_TRUNC]    = {
3483                 .it_fmt   = NULL,
3484                 .it_flags = MUTABOR,
3485                 .it_act   = NULL
3486         },
3487         [MDT_IT_GETXATTR] = {
3488                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
3489                 .it_flags = HABEO_CORPUS,
3490                 .it_act   = mdt_intent_getxattr
3491         },
3492         [MDT_IT_LAYOUT] = {
3493                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
3494                 .it_flags = 0,
3495                 .it_act   = mdt_intent_layout
3496         },
3497         [MDT_IT_GLIMPSE] = {
3498                 .it_fmt = &RQF_LDLM_INTENT,
3499                 .it_flags = 0,
3500                 .it_act = mdt_intent_glimpse,
3501         },
3502         [MDT_IT_BRW] = {
3503                 .it_fmt = &RQF_LDLM_INTENT,
3504                 .it_flags = 0,
3505                 .it_act = mdt_intent_brw,
3506         },
3507
3508 };
3509
3510 int mdt_intent_lock_replace(struct mdt_thread_info *info,
3511                             struct ldlm_lock **lockp,
3512                             struct mdt_lock_handle *lh,
3513                             __u64 flags, int result)
3514 {
3515         struct ptlrpc_request  *req = mdt_info_req(info);
3516         struct ldlm_lock       *lock = *lockp;
3517         struct ldlm_lock       *new_lock;
3518
3519         /* If possible resent found a lock, @lh is set to its handle */
3520         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3521
3522         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3523                 lh->mlh_reg_lh.cookie = 0;
3524                 RETURN(0);
3525         }
3526
3527         if (new_lock == NULL && (flags & LDLM_FL_RESENT)) {
3528                 /* Lock is pinned by ldlm_handle_enqueue0() as it is
3529                  * a resend case, however, it could be already destroyed
3530                  * due to client eviction or a raced cancel RPC. */
3531                 LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx\n",
3532                                   lh->mlh_reg_lh.cookie);
3533                 lh->mlh_reg_lh.cookie = 0;
3534                 RETURN(-ESTALE);
3535         }
3536
3537         LASSERTF(new_lock != NULL,
3538                  "lockh %#llx flags %#llx : rc = %d\n",
3539                  lh->mlh_reg_lh.cookie, flags, result);
3540
3541         /*
3542          * If we've already given this lock to a client once, then we should
3543          * have no readers or writers.  Otherwise, we should have one reader
3544          * _or_ writer ref (which will be zeroed below) before returning the
3545          * lock to a client.
3546          */
3547         if (new_lock->l_export == req->rq_export) {
3548                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3549         } else {
3550                 LASSERT(new_lock->l_export == NULL);
3551                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3552         }
3553
3554         *lockp = new_lock;
3555
3556         if (new_lock->l_export == req->rq_export) {
3557                 /*
3558                  * Already gave this to the client, which means that we
3559                  * reconstructed a reply.
3560                  */
3561                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3562                         MSG_RESENT);
3563
3564                 LDLM_LOCK_RELEASE(new_lock);
3565                 lh->mlh_reg_lh.cookie = 0;
3566                 RETURN(ELDLM_LOCK_REPLACED);
3567         }
3568
3569         /*
3570          * Fixup the lock to be given to the client.
3571          */
3572         lock_res_and_lock(new_lock);
3573         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3574          * possible blocking AST. */
3575         while (new_lock->l_readers > 0) {
3576                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3577                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3578                 new_lock->l_readers--;
3579         }
3580         while (new_lock->l_writers > 0) {
3581                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3582                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3583                 new_lock->l_writers--;
3584         }
3585
3586         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3587         new_lock->l_blocking_ast = lock->l_blocking_ast;
3588         new_lock->l_completion_ast = lock->l_completion_ast;
3589         if (ldlm_has_dom(new_lock))
3590                 new_lock->l_glimpse_ast = ldlm_server_glimpse_ast;
3591         new_lock->l_remote_handle = lock->l_remote_handle;
3592         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3593
3594         unlock_res_and_lock(new_lock);
3595
3596         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3597                      &new_lock->l_remote_handle,
3598                      &new_lock->l_exp_hash);
3599
3600         LDLM_LOCK_RELEASE(new_lock);
3601         lh->mlh_reg_lh.cookie = 0;
3602
3603         RETURN(ELDLM_LOCK_REPLACED);
3604 }
3605
3606 void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3607                              struct ldlm_lock *new_lock,
3608                              struct mdt_lock_handle *lh, __u64 flags)
3609 {
3610         struct ptlrpc_request  *req = mdt_info_req(info);
3611         struct ldlm_request    *dlmreq;
3612
3613         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3614                 return;
3615
3616         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3617
3618         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3619          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3620          * initialized. */
3621         if (flags & LDLM_FL_RESENT) {
3622                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3623                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3624
3625                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3626                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie %#llx",
3627                           lh->mlh_reg_lh.cookie);
3628                 return;
3629         }
3630
3631         /*
3632          * If the xid matches, then we know this is a resent request, and allow
3633          * it. (It's probably an OPEN, for which we don't send a lock.
3634          */
3635         if (req_can_reconstruct(req, NULL))
3636                 return;
3637
3638         /*
3639          * This remote handle isn't enqueued, so we never received or processed
3640          * this request.  Clear MSG_RESENT, because it can be handled like any
3641          * normal request now.
3642          */
3643         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3644
3645         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle %#llx",
3646                   dlmreq->lock_handle[0].cookie);
3647 }
3648
3649 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3650                                 struct mdt_thread_info *info,
3651                                 struct ldlm_lock **lockp,
3652                                 __u64 flags)
3653 {
3654         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3655         struct ldlm_reply      *ldlm_rep = NULL;
3656         int rc;
3657         ENTRY;
3658
3659         /*
3660          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3661          * (for the resend case) or a new lock. Below we will use it to
3662          * replace the original lock.
3663          */
3664         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3665         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3666                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3667                 rc = mdt_object_lock(info, info->mti_object, lhc,
3668                                      MDS_INODELOCK_XATTR);
3669                 if (rc)
3670                         return rc;
3671         }
3672
3673         rc = mdt_getxattr(info);
3674
3675         if (mdt_info_req(info)->rq_repmsg != NULL)
3676                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3677
3678         if (ldlm_rep == NULL ||
3679             OBD_FAIL_CHECK(OBD_FAIL_MDS_XATTR_REP)) {
3680                 mdt_object_unlock(info,  info->mti_object, lhc, 1);
3681                 RETURN(err_serious(-EFAULT));
3682         }
3683
3684         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3685
3686         /* This is left for interop instead of adding a new interop flag.
3687          * LU-7433 */
3688 #if LUSTRE_VERSION_CODE > OBD_OCD_VERSION(3, 0, 0, 0)
3689         if (ldlm_rep->lock_policy_res2) {
3690                 mdt_object_unlock(info, info->mti_object, lhc, 1);
3691                 RETURN(ELDLM_LOCK_ABORTED);
3692         }
3693 #endif
3694
3695         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3696         RETURN(rc);
3697 }
3698
3699 static int mdt_intent_getattr(enum mdt_it_code opcode,
3700                               struct mdt_thread_info *info,
3701                               struct ldlm_lock **lockp,
3702                               __u64 flags)
3703 {
3704         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3705         __u64                   child_bits;
3706         struct ldlm_reply      *ldlm_rep;
3707         struct mdt_body        *reqbody;
3708         struct mdt_body        *repbody;
3709         int                     rc, rc2;
3710         ENTRY;
3711
3712         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3713         LASSERT(reqbody);
3714
3715         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3716         LASSERT(repbody);
3717
3718         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3719         repbody->mbo_eadatasize = 0;
3720         repbody->mbo_aclsize = 0;
3721
3722         switch (opcode) {
3723         case MDT_IT_LOOKUP:
3724                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3725                 break;
3726         case MDT_IT_GETATTR:
3727                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3728                              MDS_INODELOCK_PERM;
3729                 break;
3730         default:
3731                 CERROR("Unsupported intent (%d)\n", opcode);
3732                 GOTO(out_shrink, rc = -EINVAL);
3733         }
3734
3735         rc = mdt_init_ucred_intent_getattr(info, reqbody);
3736         if (rc)
3737                 GOTO(out_shrink, rc);
3738
3739         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3740         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3741
3742         /* Get lock from request for possible resent case. */
3743         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3744
3745         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3746         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3747
3748         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3749                 ldlm_rep->lock_policy_res2 = 0;
3750         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3751             ldlm_rep->lock_policy_res2) {
3752                 lhc->mlh_reg_lh.cookie = 0ull;
3753                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3754         }
3755
3756         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3757         EXIT;
3758 out_ucred:
3759         mdt_exit_ucred(info);
3760 out_shrink:
3761         mdt_client_compatibility(info);
3762         rc2 = mdt_fix_reply(info);
3763         if (rc == 0)
3764                 rc = rc2;
3765         return rc;
3766 }
3767
3768 static int mdt_intent_layout(enum mdt_it_code opcode,
3769                              struct mdt_thread_info *info,
3770                              struct ldlm_lock **lockp,
3771                              __u64 flags)
3772 {
3773         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3774         struct md_layout_change layout = { .mlc_opc = MD_LAYOUT_NOP };
3775         struct layout_intent *intent;
3776         struct lu_fid *fid = &info->mti_tmp_fid2;
3777         struct mdt_object *obj = NULL;
3778         int layout_size = 0;
3779         int rc = 0;
3780         ENTRY;
3781
3782         if (opcode != MDT_IT_LAYOUT) {
3783                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3784                         opcode);
3785                 RETURN(-EINVAL);
3786         }
3787
3788         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3789
3790         intent = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3791         if (intent == NULL)
3792                 RETURN(-EPROTO);
3793
3794         CDEBUG(D_INFO, DFID "got layout change request from client: "
3795                "opc:%u flags:%#x extent "DEXT"\n",
3796                PFID(fid), intent->li_opc, intent->li_flags,
3797                PEXT(&intent->li_extent));
3798
3799         switch (intent->li_opc) {
3800         case LAYOUT_INTENT_TRUNC:
3801         case LAYOUT_INTENT_WRITE:
3802                 layout.mlc_opc = MD_LAYOUT_WRITE;
3803                 layout.mlc_intent = intent;
3804                 break;
3805         case LAYOUT_INTENT_ACCESS:
3806                 break;
3807         case LAYOUT_INTENT_READ:
3808         case LAYOUT_INTENT_GLIMPSE:
3809         case LAYOUT_INTENT_RELEASE:
3810         case LAYOUT_INTENT_RESTORE:
3811                 CERROR("%s: Unsupported layout intent opc %d\n",
3812                        mdt_obd_name(info->mti_mdt), intent->li_opc);
3813                 rc = -ENOTSUPP;
3814                 break;
3815         default:
3816                 CERROR("%s: Unknown layout intent opc %d\n",
3817                        mdt_obd_name(info->mti_mdt), intent->li_opc);
3818                 rc = -EINVAL;
3819                 break;
3820         }
3821         if (rc < 0)
3822                 RETURN(rc);
3823
3824         /* Get lock from request for possible resent case. */
3825         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3826
3827         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3828         if (IS_ERR(obj))
3829                 GOTO(out, rc = PTR_ERR(obj));
3830
3831
3832         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3833                 /* if layout is going to be changed don't use the current EA
3834                  * size but the maximum one. That buffer will be shrinked
3835                  * to the actual size in req_capsule_shrink() before reply.
3836                  */
3837                 if (layout.mlc_opc == MD_LAYOUT_WRITE) {
3838                         layout_size = info->mti_mdt->mdt_max_mdsize;
3839                 } else {
3840                         layout_size = mdt_attr_get_eabuf_size(info, obj);
3841                         if (layout_size < 0)
3842                                 GOTO(out_obj, rc = layout_size);
3843
3844                         if (layout_size > info->mti_mdt->mdt_max_mdsize)
3845                                 info->mti_mdt->mdt_max_mdsize = layout_size;
3846                 }
3847         }
3848
3849         /*
3850          * set reply buffer size, so that ldlm_handle_enqueue0()->
3851          * ldlm_lvbo_fill() will fill the reply buffer with lovea.
3852          */
3853         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3854         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3855                              layout_size);
3856         rc = req_capsule_server_pack(info->mti_pill);
3857         if (rc)
3858                 GOTO(out_obj, rc);
3859
3860
3861         if (layout.mlc_opc != MD_LAYOUT_NOP) {
3862                 struct lu_buf *buf = &layout.mlc_buf;
3863
3864                 /**
3865                  * mdt_layout_change is a reint operation, when the request
3866                  * is resent, layout write shouldn't reprocess it again.
3867                  */
3868                 rc = mdt_check_resent(info, mdt_reconstruct_generic, lhc);
3869                 if (rc)
3870                         GOTO(out_obj, rc = rc < 0 ? rc : 0);
3871
3872                 /**
3873                  * There is another resent case: the client's job has been
3874                  * done by another client, referring lod_declare_layout_change
3875                  * -EALREADY case, and it became a operation w/o transaction,
3876                  * so we should not do the layout change, otherwise
3877                  * mdt_layout_change() will try to cancel the granted server
3878                  * CR lock whose remote counterpart is still in hold on the
3879                  * client, and a deadlock ensues.
3880                  */
3881                 rc = mdt_check_resent_lock(info, obj, lhc);
3882                 if (rc <= 0)
3883                         GOTO(out_obj, rc);
3884
3885                 buf->lb_buf = NULL;
3886                 buf->lb_len = 0;
3887                 if (unlikely(req_is_replay(mdt_info_req(info)))) {
3888                         buf->lb_buf = req_capsule_client_get(info->mti_pill,
3889                                         &RMF_EADATA);
3890                         buf->lb_len = req_capsule_get_size(info->mti_pill,
3891                                         &RMF_EADATA, RCL_CLIENT);
3892                         /*
3893                          * If it's a replay of layout write intent RPC, the
3894                          * client has saved the extended lovea when
3895                          * it get reply then.
3896                          */
3897                         if (buf->lb_len > 0)
3898                                 mdt_fix_lov_magic(info, buf->lb_buf);
3899                 }
3900                 /*
3901                  * Instantiate some layout components, if @buf contains
3902                  * lovea, then it's a replay of the layout intent write
3903                  * RPC.
3904                  */
3905                 rc = mdt_layout_change(info, obj, &layout);
3906                 if (rc)
3907                         GOTO(out_obj, rc);
3908         }
3909 out_obj:
3910         mdt_object_put(info->mti_env, obj);
3911
3912         if (rc == 0 && lustre_handle_is_used(&lhc->mlh_reg_lh))
3913                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3914
3915 out:
3916         lhc->mlh_reg_lh.cookie = 0;
3917
3918         return rc;
3919 }
3920
3921 static int mdt_intent_reint(enum mdt_it_code opcode,
3922                             struct mdt_thread_info *info,
3923                             struct ldlm_lock **lockp,
3924                             __u64 flags)
3925 {
3926         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3927         struct ldlm_reply      *rep = NULL;
3928         long                    opc;
3929         int                     rc;
3930
3931         static const struct req_format *intent_fmts[REINT_MAX] = {
3932                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3933                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3934         };
3935
3936         ENTRY;
3937
3938         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3939         if (opc < 0)
3940                 RETURN(opc);
3941
3942         if (mdt_it_flavor[opcode].it_reint != opc) {
3943                 CERROR("Reint code %ld doesn't match intent: %d\n",
3944                        opc, opcode);
3945                 RETURN(err_serious(-EPROTO));
3946         }
3947
3948         /* Get lock from request for possible resent case. */
3949         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3950
3951         rc = mdt_reint_internal(info, lhc, opc);
3952
3953         /* Check whether the reply has been packed successfully. */
3954         if (mdt_info_req(info)->rq_repmsg != NULL)
3955                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3956         if (rep == NULL)
3957                 RETURN(err_serious(-EFAULT));
3958
3959         /* MDC expects this in any case */
3960         if (rc != 0)
3961                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3962
3963         /* the open lock or the lock for cross-ref object should be
3964          * returned to the client */
3965         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3966             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3967                 rep->lock_policy_res2 = 0;
3968                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3969                 RETURN(rc);
3970         }
3971
3972         rep->lock_policy_res2 = clear_serious(rc);
3973
3974         if (rep->lock_policy_res2 == -ENOENT &&
3975             mdt_get_disposition(rep, DISP_LOOKUP_NEG) &&
3976             !mdt_get_disposition(rep, DISP_OPEN_CREATE))
3977                 rep->lock_policy_res2 = 0;
3978
3979         lhc->mlh_reg_lh.cookie = 0ull;
3980         if (rc == -ENOTCONN || rc == -ENODEV ||
3981             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3982                 /*
3983                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3984                  * will be returned by rq_status, and client at ptlrpc layer
3985                  * will detect this, then disconnect, reconnect the import
3986                  * immediately, instead of impacting the following the rpc.
3987                  */
3988                 RETURN(rc);
3989         }
3990         /*
3991          * For other cases, the error will be returned by intent, and client
3992          * will retrieve the result from intent.
3993          */
3994         RETURN(ELDLM_LOCK_ABORTED);
3995 }
3996
3997 static int mdt_intent_code(enum ldlm_intent_flags itcode)
3998 {
3999         int rc;
4000
4001         switch (itcode) {
4002         case IT_OPEN:
4003                 rc = MDT_IT_OPEN;
4004                 break;
4005         case IT_OPEN|IT_CREAT:
4006                 rc = MDT_IT_OCREAT;
4007                 break;
4008         case IT_CREAT:
4009                 rc = MDT_IT_CREATE;
4010                 break;
4011         case IT_READDIR:
4012                 rc = MDT_IT_READDIR;
4013                 break;
4014         case IT_GETATTR:
4015                 rc = MDT_IT_GETATTR;
4016                 break;
4017         case IT_LOOKUP:
4018                 rc = MDT_IT_LOOKUP;
4019                 break;
4020         case IT_UNLINK:
4021                 rc = MDT_IT_UNLINK;
4022                 break;
4023         case IT_TRUNC:
4024                 rc = MDT_IT_TRUNC;
4025                 break;
4026         case IT_GETXATTR:
4027                 rc = MDT_IT_GETXATTR;
4028                 break;
4029         case IT_LAYOUT:
4030                 rc = MDT_IT_LAYOUT;
4031                 break;
4032         case IT_QUOTA_DQACQ:
4033         case IT_QUOTA_CONN:
4034                 rc = MDT_IT_QUOTA;
4035                 break;
4036         case IT_GLIMPSE:
4037                 rc = MDT_IT_GLIMPSE;
4038                 break;
4039         case IT_BRW:
4040                 rc = MDT_IT_BRW;
4041                 break;
4042         default:
4043                 CERROR("Unknown intent opcode: 0x%08x\n", itcode);
4044                 rc = -EINVAL;
4045                 break;
4046         }
4047         return rc;
4048 }
4049
4050 static int mdt_intent_opc(enum ldlm_intent_flags itopc,
4051                           struct mdt_thread_info *info,
4052                           struct ldlm_lock **lockp, __u64 flags)
4053 {
4054         struct req_capsule      *pill = info->mti_pill;
4055         struct ptlrpc_request   *req = mdt_info_req(info);
4056         struct mdt_it_flavor    *flv;
4057         int opc;
4058         int rc;
4059         ENTRY;
4060
4061         opc = mdt_intent_code(itopc);
4062         if (opc < 0)
4063                 RETURN(-EINVAL);
4064
4065         if (opc == MDT_IT_QUOTA) {
4066                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
4067
4068                 if (qmt == NULL)
4069                         RETURN(-EOPNOTSUPP);
4070
4071                 if (mdt_rdonly(req->rq_export))
4072                         RETURN(-EROFS);
4073
4074                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
4075                 /* pass the request to quota master */
4076                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
4077                                                  mdt_info_req(info), lockp,
4078                                                  flags);
4079                 RETURN(rc);
4080         }
4081
4082         flv = &mdt_it_flavor[opc];
4083         if (flv->it_fmt != NULL)
4084                 req_capsule_extend(pill, flv->it_fmt);
4085
4086         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
4087         if (rc < 0)
4088                 RETURN(rc);
4089
4090         if (flv->it_flags & MUTABOR && mdt_rdonly(req->rq_export))
4091                 RETURN(-EROFS);
4092
4093         if (flv->it_act != NULL) {
4094                 struct ldlm_reply *rep;
4095
4096                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
4097
4098                 /* execute policy */
4099                 rc = flv->it_act(opc, info, lockp, flags);
4100
4101                 /* Check whether the reply has been packed successfully. */
4102                 if (req->rq_repmsg != NULL) {
4103                         rep = req_capsule_server_get(info->mti_pill,
4104                                                      &RMF_DLM_REP);
4105                         rep->lock_policy_res2 =
4106                                 ptlrpc_status_hton(rep->lock_policy_res2);
4107                 }
4108         }
4109
4110         RETURN(rc);
4111 }
4112
4113 static void mdt_ptlrpc_stats_update(struct ptlrpc_request *req,
4114                                     enum ldlm_intent_flags it_opc)
4115 {
4116         struct lprocfs_stats *srv_stats = ptlrpc_req2svc(req)->srv_stats;
4117
4118         /* update stats when IT code is known */
4119         if (srv_stats != NULL)
4120                 lprocfs_counter_incr(srv_stats,
4121                                 PTLRPC_LAST_CNTR + (it_opc == IT_GLIMPSE ?
4122                                 LDLM_GLIMPSE_ENQUEUE : LDLM_IBITS_ENQUEUE));
4123 }
4124
4125 static int mdt_intent_policy(struct ldlm_namespace *ns,
4126                              struct ldlm_lock **lockp, void *req_cookie,
4127                              enum ldlm_mode mode, __u64 flags, void *data)
4128 {
4129         struct tgt_session_info *tsi;
4130         struct mdt_thread_info  *info;
4131         struct ptlrpc_request   *req  =  req_cookie;
4132         struct ldlm_intent      *it;
4133         struct req_capsule      *pill;
4134         const struct ldlm_lock_desc *ldesc;
4135         int rc;
4136
4137         ENTRY;
4138
4139         LASSERT(req != NULL);
4140
4141         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
4142
4143         info = tsi2mdt_info(tsi);
4144         LASSERT(info != NULL);
4145         pill = info->mti_pill;
4146         LASSERT(pill->rc_req == req);
4147         ldesc = &info->mti_dlm_req->lock_desc;
4148
4149         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
4150                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
4151                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
4152                 if (it != NULL) {
4153                         mdt_ptlrpc_stats_update(req, it->opc);
4154                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
4155                         if (rc == 0)
4156                                 rc = ELDLM_OK;
4157
4158                         /* Lock without inodebits makes no sense and will oops
4159                          * later in ldlm. Let's check it now to see if we have
4160                          * ibits corrupted somewhere in mdt_intent_opc().
4161                          * The case for client miss to set ibits has been
4162                          * processed by others. */
4163                         LASSERT(ergo(ldesc->l_resource.lr_type == LDLM_IBITS,
4164                                 ldesc->l_policy_data.l_inodebits.bits != 0));
4165                 } else {
4166                         rc = err_serious(-EFAULT);
4167                 }
4168         } else {
4169                 /* No intent was provided */
4170                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
4171                 rc = req_capsule_server_pack(pill);
4172                 if (rc)
4173                         rc = err_serious(rc);
4174         }
4175         mdt_thread_info_fini(info);
4176         RETURN(rc);
4177 }
4178
4179 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
4180 {
4181         struct seq_server_site  *ss = mdt_seq_site(mdt);
4182
4183         if (ss->ss_node_id == 0)
4184                 return;
4185
4186         if (ss->ss_client_seq != NULL) {
4187                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
4188                 ss->ss_client_seq->lcs_exp = NULL;
4189         }
4190
4191         if (ss->ss_server_fld != NULL) {
4192                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
4193                 ss->ss_server_fld->lsf_control_exp = NULL;
4194         }
4195 }
4196
4197 static void mdt_seq_fini_cli(struct mdt_device *mdt)
4198 {
4199         struct seq_server_site *ss = mdt_seq_site(mdt);
4200
4201         if (ss == NULL)
4202                 return;
4203
4204         if (ss->ss_server_seq != NULL)
4205                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
4206 }
4207
4208 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
4209 {
4210         mdt_seq_fini_cli(mdt);
4211         mdt_deregister_seq_exp(mdt);
4212
4213         return seq_site_fini(env, mdt_seq_site(mdt));
4214 }
4215
4216 /**
4217  * It will retrieve its FLDB entries from MDT0, and it only happens
4218  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
4219  * and it needs to refresh FLDB from the MDT0.
4220  **/
4221 static int mdt_register_lwp_callback(void *data)
4222 {
4223         struct lu_env           env;
4224         struct mdt_device       *mdt = data;
4225         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
4226         int                     rc;
4227         ENTRY;
4228
4229         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
4230
4231         rc = lu_env_init(&env, LCT_MD_THREAD);
4232         if (rc < 0) {
4233                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
4234                 RETURN(rc);
4235         }
4236
4237         /* Allocate new sequence now to avoid creating local transaction
4238          * in the normal transaction process */
4239         rc = seq_server_check_and_alloc_super(&env,
4240                                               mdt_seq_site(mdt)->ss_server_seq);
4241         if (rc < 0)
4242                 GOTO(out, rc);
4243
4244         if (fld->lsf_new) {
4245                 rc = fld_update_from_controller(&env, fld);
4246                 if (rc != 0) {
4247                         CERROR("%s: cannot update controller: rc = %d\n",
4248                                mdt_obd_name(mdt), rc);
4249                         GOTO(out, rc);
4250                 }
4251         }
4252 out:
4253         lu_env_fini(&env);
4254         RETURN(rc);
4255 }
4256
4257 static int mdt_register_seq_exp(struct mdt_device *mdt)
4258 {
4259         struct seq_server_site  *ss = mdt_seq_site(mdt);
4260         char                    *lwp_name = NULL;
4261         int                     rc;
4262
4263         if (ss->ss_node_id == 0)
4264                 return 0;
4265
4266         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
4267         if (lwp_name == NULL)
4268                 GOTO(out_free, rc = -ENOMEM);
4269
4270         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
4271         if (rc != 0)
4272                 GOTO(out_free, rc);
4273
4274         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
4275                                       NULL, NULL);
4276         if (rc != 0)
4277                 GOTO(out_free, rc);
4278
4279         rc = lustre_register_lwp_item(lwp_name,
4280                                       &ss->ss_server_fld->lsf_control_exp,
4281                                       mdt_register_lwp_callback, mdt);
4282         if (rc != 0) {
4283                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
4284                 ss->ss_client_seq->lcs_exp = NULL;
4285                 GOTO(out_free, rc);
4286         }
4287 out_free:
4288         if (lwp_name != NULL)
4289                 OBD_FREE(lwp_name, MAX_OBD_NAME);
4290
4291         return rc;
4292 }
4293
4294 /*
4295  * Init client sequence manager which is used by local MDS to talk to sequence
4296  * controller on remote node.
4297  */
4298 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
4299 {
4300         struct seq_server_site  *ss = mdt_seq_site(mdt);
4301         int                     rc;
4302         char                    *prefix;
4303         ENTRY;
4304
4305         /* check if this is adding the first MDC and controller is not yet
4306          * initialized. */
4307         OBD_ALLOC_PTR(ss->ss_client_seq);
4308         if (ss->ss_client_seq == NULL)
4309                 RETURN(-ENOMEM);
4310
4311         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
4312         if (prefix == NULL) {
4313                 OBD_FREE_PTR(ss->ss_client_seq);
4314                 ss->ss_client_seq = NULL;
4315                 RETURN(-ENOMEM);
4316         }
4317
4318         /* Note: seq_client_fini will be called in seq_site_fini */
4319         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
4320         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
4321                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
4322                                                             NULL);
4323         OBD_FREE(prefix, MAX_OBD_NAME + 5);
4324         if (rc != 0) {
4325                 OBD_FREE_PTR(ss->ss_client_seq);
4326                 ss->ss_client_seq = NULL;
4327                 RETURN(rc);
4328         }
4329
4330         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
4331
4332         RETURN(rc);
4333 }
4334
4335 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
4336 {
4337         struct seq_server_site  *ss;
4338         int                     rc;
4339         ENTRY;
4340
4341         ss = mdt_seq_site(mdt);
4342         /* init sequence controller server(MDT0) */
4343         if (ss->ss_node_id == 0) {
4344                 OBD_ALLOC_PTR(ss->ss_control_seq);
4345                 if (ss->ss_control_seq == NULL)
4346                         RETURN(-ENOMEM);
4347
4348                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
4349                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
4350                                      ss);
4351                 if (rc)
4352                         GOTO(out_seq_fini, rc);
4353         }
4354
4355         /* Init normal sequence server */
4356         OBD_ALLOC_PTR(ss->ss_server_seq);
4357         if (ss->ss_server_seq == NULL)
4358                 GOTO(out_seq_fini, rc = -ENOMEM);
4359
4360         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
4361                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
4362         if (rc)
4363                 GOTO(out_seq_fini, rc);
4364
4365         /* init seq client for seq server to talk to seq controller(MDT0) */
4366         rc = mdt_seq_init_cli(env, mdt);
4367         if (rc != 0)
4368                 GOTO(out_seq_fini, rc);
4369
4370         if (ss->ss_node_id != 0)
4371                 /* register controller export through lwp */
4372                 rc = mdt_register_seq_exp(mdt);
4373
4374         EXIT;
4375 out_seq_fini:
4376         if (rc)
4377                 mdt_seq_fini(env, mdt);
4378
4379         return rc;
4380 }
4381
4382 /*
4383  * FLD wrappers
4384  */
4385 static int mdt_fld_fini(const struct lu_env *env,
4386                         struct mdt_device *m)
4387 {
4388         struct seq_server_site *ss = mdt_seq_site(m);
4389         ENTRY;
4390
4391         if (ss && ss->ss_server_fld) {
4392                 fld_server_fini(env, ss->ss_server_fld);
4393                 OBD_FREE_PTR(ss->ss_server_fld);
4394                 ss->ss_server_fld = NULL;
4395         }
4396
4397         RETURN(0);
4398 }
4399
4400 static int mdt_fld_init(const struct lu_env *env,
4401                         const char *uuid,
4402                         struct mdt_device *m)
4403 {
4404         struct seq_server_site *ss;
4405         int rc;
4406         ENTRY;
4407
4408         ss = mdt_seq_site(m);
4409
4410         OBD_ALLOC_PTR(ss->ss_server_fld);
4411         if (ss->ss_server_fld == NULL)
4412                 RETURN(rc = -ENOMEM);
4413
4414         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
4415                              LU_SEQ_RANGE_MDT);
4416         if (rc) {
4417                 OBD_FREE_PTR(ss->ss_server_fld);
4418                 ss->ss_server_fld = NULL;
4419                 RETURN(rc);
4420         }
4421
4422         RETURN(0);
4423 }
4424
4425 static void mdt_stack_pre_fini(const struct lu_env *env,
4426                            struct mdt_device *m, struct lu_device *top)
4427 {
4428         struct lustre_cfg_bufs  *bufs;
4429         struct lustre_cfg       *lcfg;
4430         struct mdt_thread_info  *info;
4431         ENTRY;
4432
4433         LASSERT(top);
4434
4435         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4436         LASSERT(info != NULL);
4437
4438         bufs = &info->mti_u.bufs;
4439
4440         LASSERT(m->mdt_child_exp);
4441         LASSERT(m->mdt_child_exp->exp_obd);
4442
4443         /* process cleanup, pass mdt obd name to get obd umount flags */
4444         /* XXX: this is needed because all layers are referenced by
4445          * objects (some of them are pinned by osd, for example *
4446          * the proper solution should be a model where object used
4447          * by osd only doesn't have mdt/mdd slices -bzzz */
4448         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4449         lustre_cfg_bufs_set_string(bufs, 1, NULL);
4450         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4451         if (!lcfg)
4452                 RETURN_EXIT;
4453         lustre_cfg_init(lcfg, LCFG_PRE_CLEANUP, bufs);
4454
4455         top->ld_ops->ldo_process_config(env, top, lcfg);
4456         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4457         EXIT;
4458 }
4459
4460 static void mdt_stack_fini(const struct lu_env *env,
4461                            struct mdt_device *m, struct lu_device *top)
4462 {
4463         struct obd_device       *obd = mdt2obd_dev(m);
4464         struct lustre_cfg_bufs  *bufs;
4465         struct lustre_cfg       *lcfg;
4466         struct mdt_thread_info  *info;
4467         char                     flags[3] = "";
4468         ENTRY;
4469
4470         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4471         LASSERT(info != NULL);
4472
4473         lu_dev_del_linkage(top->ld_site, top);
4474
4475         lu_site_purge(env, top->ld_site, -1);
4476
4477         bufs = &info->mti_u.bufs;
4478         /* process cleanup, pass mdt obd name to get obd umount flags */
4479         /* another purpose is to let all layers to release their objects */
4480         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4481         if (obd->obd_force)
4482                 strcat(flags, "F");
4483         if (obd->obd_fail)
4484                 strcat(flags, "A");
4485         lustre_cfg_bufs_set_string(bufs, 1, flags);
4486         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4487         if (!lcfg)
4488                 RETURN_EXIT;
4489         lustre_cfg_init(lcfg, LCFG_CLEANUP, bufs);
4490
4491         LASSERT(top);
4492         top->ld_ops->ldo_process_config(env, top, lcfg);
4493         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4494
4495         lu_site_purge(env, top->ld_site, -1);
4496
4497         m->mdt_child = NULL;
4498         m->mdt_bottom = NULL;
4499
4500         obd_disconnect(m->mdt_child_exp);
4501         m->mdt_child_exp = NULL;
4502
4503         obd_disconnect(m->mdt_bottom_exp);
4504         m->mdt_child_exp = NULL;
4505 }
4506
4507 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
4508                                const char *next, struct obd_export **exp)
4509 {
4510         struct obd_connect_data *data = NULL;
4511         struct obd_device       *obd;
4512         int                      rc;
4513         ENTRY;
4514
4515         OBD_ALLOC_PTR(data);
4516         if (data == NULL)
4517                 GOTO(out, rc = -ENOMEM);
4518
4519         obd = class_name2obd(next);
4520         if (obd == NULL) {
4521                 CERROR("%s: can't locate next device: %s\n",
4522                        mdt_obd_name(m), next);
4523                 GOTO(out, rc = -ENOTCONN);
4524         }
4525
4526         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4527         data->ocd_version = LUSTRE_VERSION_CODE;
4528
4529         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
4530         if (rc) {
4531                 CERROR("%s: cannot connect to next dev %s (%d)\n",
4532                        mdt_obd_name(m), next, rc);
4533                 GOTO(out, rc);
4534         }
4535
4536 out:
4537         if (data)
4538                 OBD_FREE_PTR(data);
4539         RETURN(rc);
4540 }
4541
4542 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
4543                           struct lustre_cfg *cfg)
4544 {
4545         char                   *dev = lustre_cfg_string(cfg, 0);
4546         int                     rc, name_size, uuid_size;
4547         char                   *name, *uuid, *p;
4548         struct lustre_cfg_bufs *bufs;
4549         struct lustre_cfg      *lcfg;
4550         struct obd_device      *obd;
4551         struct lustre_profile  *lprof;
4552         struct lu_site         *site;
4553         ENTRY;
4554
4555         /* in 1.8 we had the only device in the stack - MDS.
4556          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
4557          * in 2.3 OSD is instantiated by obd_mount.c, so we need
4558          * to generate names and setup MDT, MDD. MDT will be using
4559          * generated name to connect to MDD. for MDD the next device
4560          * will be LOD with name taken from so called "profile" which
4561          * is generated by mount_option line
4562          *
4563          * 1.8 MGS generates config. commands like this:
4564          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
4565          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
4566          * 2.0 MGS generates config. commands like this:
4567          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
4568          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4569          *                    3:lustre-MDT0000-mdtlov  4:f
4570          *
4571          * we generate MDD name from MDT one, just replacing T with D
4572          *
4573          * after all the preparations, the logical equivalent will be
4574          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
4575          *                    3:lustre-MDT0000-mdtlov  4:f
4576          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4577          *                    3:lustre-MDD0000  4:f
4578          *
4579          *  notice we build the stack from down to top: MDD first, then MDT */
4580
4581         name_size = MAX_OBD_NAME;
4582         uuid_size = MAX_OBD_NAME;
4583
4584         OBD_ALLOC(name, name_size);
4585         OBD_ALLOC(uuid, uuid_size);
4586         if (name == NULL || uuid == NULL)
4587                 GOTO(cleanup_mem, rc = -ENOMEM);
4588
4589         OBD_ALLOC_PTR(bufs);
4590         if (!bufs)
4591                 GOTO(cleanup_mem, rc = -ENOMEM);
4592
4593         strcpy(name, dev);
4594         p = strstr(name, "-MDT");
4595         if (p == NULL)
4596                 GOTO(free_bufs, rc = -ENOMEM);
4597         p[3] = 'D';
4598
4599         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
4600
4601         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4602         if (lprof == NULL || lprof->lp_dt == NULL) {
4603                 CERROR("can't find the profile: %s\n",
4604                        lustre_cfg_string(cfg, 0));
4605                 GOTO(free_bufs, rc = -EINVAL);
4606         }
4607
4608         lustre_cfg_bufs_reset(bufs, name);
4609         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
4610         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4611         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4612
4613         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4614         if (!lcfg)
4615                 GOTO(put_profile, rc = -ENOMEM);
4616         lustre_cfg_init(lcfg, LCFG_ATTACH, bufs);
4617
4618         rc = class_attach(lcfg);
4619         if (rc)
4620                 GOTO(lcfg_cleanup, rc);
4621
4622         obd = class_name2obd(name);
4623         if (!obd) {
4624                 CERROR("Can not find obd %s (%s in config)\n",
4625                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
4626                 GOTO(lcfg_cleanup, rc = -EINVAL);
4627         }
4628
4629         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4630
4631         lustre_cfg_bufs_reset(bufs, name);
4632         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4633         lustre_cfg_bufs_set_string(bufs, 2, dev);
4634         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4635
4636         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4637         if (!lcfg)
4638                 GOTO(class_detach, rc = -ENOMEM);
4639         lustre_cfg_init(lcfg, LCFG_SETUP, bufs);
4640
4641         rc = class_setup(obd, lcfg);
4642         if (rc)
4643                 GOTO(class_detach, rc);
4644
4645         /* connect to MDD we just setup */
4646         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
4647         if (rc)
4648                 GOTO(class_detach, rc);
4649
4650         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
4651         LASSERT(site);
4652         LASSERT(mdt_lu_site(mdt) == NULL);
4653         mdt->mdt_lu_dev.ld_site = site;
4654         site->ls_top_dev = &mdt->mdt_lu_dev;
4655         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
4656
4657         /* now connect to bottom OSD */
4658         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
4659         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
4660         if (rc)
4661                 GOTO(class_detach, rc);
4662         mdt->mdt_bottom =
4663                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
4664
4665         rc = lu_env_refill((struct lu_env *)env);
4666         if (rc != 0)
4667                 CERROR("Failure to refill session: '%d'\n", rc);
4668
4669         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
4670
4671         EXIT;
4672 class_detach:
4673         if (rc)
4674                 class_detach(obd, lcfg);
4675 lcfg_cleanup:
4676         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4677 put_profile:
4678         class_put_profile(lprof);
4679 free_bufs:
4680         OBD_FREE_PTR(bufs);
4681 cleanup_mem:
4682         if (name)
4683                 OBD_FREE(name, name_size);
4684         if (uuid)
4685                 OBD_FREE(uuid, uuid_size);
4686         RETURN(rc);
4687 }
4688
4689 /* setup quota master target on MDT0 */
4690 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
4691                           struct lustre_cfg *cfg)
4692 {
4693         struct obd_device       *obd;
4694         char                    *dev = lustre_cfg_string(cfg, 0);
4695         char                    *qmtname, *uuid, *p;
4696         struct lustre_cfg_bufs  *bufs;
4697         struct lustre_cfg       *lcfg;
4698         struct lustre_profile   *lprof;
4699         struct obd_connect_data *data;
4700         int                      rc;
4701         ENTRY;
4702
4703         LASSERT(mdt->mdt_qmt_exp == NULL);
4704         LASSERT(mdt->mdt_qmt_dev == NULL);
4705
4706         /* quota master is on MDT0 only for now */
4707         if (mdt->mdt_seq_site.ss_node_id != 0)
4708                 RETURN(0);
4709
4710         /* MGS generates config commands which look as follows:
4711          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4712          *                    3:lustre-MDT0000-mdtlov  4:f
4713          *
4714          * We generate the QMT name from the MDT one, just replacing MD with QM
4715          * after all the preparations, the logical equivalent will be:
4716          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4717          *                    3:lustre-MDT0000-osd  4:f */
4718         OBD_ALLOC(qmtname, MAX_OBD_NAME);
4719         OBD_ALLOC(uuid, UUID_MAX);
4720         OBD_ALLOC_PTR(bufs);
4721         OBD_ALLOC_PTR(data);
4722         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
4723                 GOTO(cleanup_mem, rc = -ENOMEM);
4724
4725         strcpy(qmtname, dev);
4726         p = strstr(qmtname, "-MDT");
4727         if (p == NULL)
4728                 GOTO(cleanup_mem, rc = -ENOMEM);
4729         /* replace MD with QM */
4730         p[1] = 'Q';
4731         p[2] = 'M';
4732
4733         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4734
4735         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4736         if (lprof == NULL || lprof->lp_dt == NULL) {
4737                 CERROR("can't find profile for %s\n",
4738                        lustre_cfg_string(cfg, 0));
4739                 GOTO(cleanup_mem, rc = -EINVAL);
4740         }
4741
4742         lustre_cfg_bufs_reset(bufs, qmtname);
4743         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4744         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4745         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4746
4747         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4748         if (!lcfg)
4749                 GOTO(put_profile, rc = -ENOMEM);
4750         lustre_cfg_init(lcfg, LCFG_ATTACH, bufs);
4751
4752         rc = class_attach(lcfg);
4753         if (rc)
4754                 GOTO(lcfg_cleanup, rc);
4755
4756         obd = class_name2obd(qmtname);
4757         if (!obd) {
4758                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4759                        lustre_cfg_string(cfg, 0));
4760                 GOTO(lcfg_cleanup, rc = -EINVAL);
4761         }
4762
4763         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4764
4765         lustre_cfg_bufs_reset(bufs, qmtname);
4766         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4767         lustre_cfg_bufs_set_string(bufs, 2, dev);
4768
4769         /* for quota, the next device should be the OSD device */
4770         lustre_cfg_bufs_set_string(bufs, 3,
4771                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4772
4773         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4774         if (!lcfg)
4775                 GOTO(class_detach, rc = -ENOMEM);
4776         lustre_cfg_init(lcfg, LCFG_SETUP, bufs);
4777
4778         rc = class_setup(obd, lcfg);
4779         if (rc)
4780                 GOTO(class_detach, rc);
4781
4782         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4783
4784         /* configure local quota objects */
4785         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4786                                                    &mdt->mdt_lu_dev,
4787                                                    mdt->mdt_qmt_dev);
4788         if (rc)
4789                 GOTO(class_cleanup, rc);
4790
4791         /* connect to quota master target */
4792         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4793         data->ocd_version = LUSTRE_VERSION_CODE;
4794         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4795                          data, NULL);
4796         if (rc) {
4797                 CERROR("cannot connect to quota master device %s (%d)\n",
4798                        qmtname, rc);
4799                 GOTO(class_cleanup, rc);
4800         }
4801
4802         EXIT;
4803 class_cleanup:
4804         if (rc) {
4805                 class_manual_cleanup(obd);
4806                 mdt->mdt_qmt_dev = NULL;
4807         }
4808 class_detach:
4809         if (rc)
4810                 class_detach(obd, lcfg);
4811 lcfg_cleanup:
4812         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4813 put_profile:
4814         class_put_profile(lprof);
4815 cleanup_mem:
4816         if (bufs)
4817                 OBD_FREE_PTR(bufs);
4818         if (qmtname)
4819                 OBD_FREE(qmtname, MAX_OBD_NAME);
4820         if (uuid)
4821                 OBD_FREE(uuid, UUID_MAX);
4822         if (data)
4823                 OBD_FREE_PTR(data);
4824         return rc;
4825 }
4826
4827 /* Shutdown quota master target associated with mdt */
4828 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4829 {
4830         ENTRY;
4831
4832         if (mdt->mdt_qmt_exp == NULL)
4833                 RETURN_EXIT;
4834         LASSERT(mdt->mdt_qmt_dev != NULL);
4835
4836         /* the qmt automatically shuts down when the mdt disconnects */
4837         obd_disconnect(mdt->mdt_qmt_exp);
4838         mdt->mdt_qmt_exp = NULL;
4839         mdt->mdt_qmt_dev = NULL;
4840         EXIT;
4841 }
4842
4843 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4844  * for now. This will be removed along with converting rest of MDT code
4845  * to use tgt_session_info */
4846 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4847 {
4848         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4849         int                      rc;
4850
4851         rc = mdt_getxattr(info);
4852
4853         mdt_thread_info_fini(info);
4854         return rc;
4855 }
4856
4857 #define OBD_FAIL_OST_READ_NET   OBD_FAIL_OST_BRW_NET
4858 #define OBD_FAIL_OST_WRITE_NET  OBD_FAIL_OST_BRW_NET
4859 #define OST_BRW_READ    OST_READ
4860 #define OST_BRW_WRITE   OST_WRITE
4861
4862 static struct tgt_handler mdt_tgt_handlers[] = {
4863 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4864                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4865                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4866 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4867                 0,                      MDS_DISCONNECT, tgt_disconnect,
4868                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4869 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4870                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4871                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4872 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4873 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GET_ROOT,   mdt_get_root),
4874 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4875 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4876                                                         mdt_getattr_name),
4877 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4878 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4879 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4880 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4881 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4882 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4883 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4884 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4885                                                         mdt_hsm_progress),
4886 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4887                                                         mdt_hsm_ct_register),
4888 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4889                                                         mdt_hsm_ct_unregister),
4890 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4891                                                         mdt_hsm_state_get),
4892 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4893                                                         mdt_hsm_state_set),
4894 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4895 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4896                                                         mdt_hsm_request),
4897 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4898             MDS_SWAP_LAYOUTS,
4899             mdt_swap_layouts),
4900 };
4901
4902 static struct tgt_handler mdt_io_ops[] = {
4903 TGT_OST_HDL_HP(HABEO_CORPUS | HABEO_REFERO, OST_BRW_READ, tgt_brw_read,
4904                                                         mdt_hp_brw),
4905 TGT_OST_HDL_HP(HABEO_CORPUS | MUTABOR,   OST_BRW_WRITE, tgt_brw_write,
4906                                                         mdt_hp_brw),
4907 TGT_OST_HDL_HP(HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4908                                          OST_PUNCH,     mdt_punch_hdl,
4909                                                         mdt_hp_punch),
4910 TGT_OST_HDL(HABEO_CORPUS | HABEO_REFERO, OST_SYNC,      mdt_data_sync),
4911 };
4912
4913 static struct tgt_handler mdt_sec_ctx_ops[] = {
4914 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4915 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4916 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4917 };
4918
4919 static struct tgt_handler mdt_quota_ops[] = {
4920 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4921 };
4922
4923 static struct tgt_opc_slice mdt_common_slice[] = {
4924         {
4925                 .tos_opc_start  = MDS_FIRST_OPC,
4926                 .tos_opc_end    = MDS_LAST_OPC,
4927                 .tos_hs         = mdt_tgt_handlers
4928         },
4929         {
4930                 .tos_opc_start  = OBD_FIRST_OPC,
4931                 .tos_opc_end    = OBD_LAST_OPC,
4932                 .tos_hs         = tgt_obd_handlers
4933         },
4934         {
4935                 .tos_opc_start  = LDLM_FIRST_OPC,
4936                 .tos_opc_end    = LDLM_LAST_OPC,
4937                 .tos_hs         = tgt_dlm_handlers
4938         },
4939         {
4940                 .tos_opc_start  = SEC_FIRST_OPC,
4941                 .tos_opc_end    = SEC_LAST_OPC,
4942                 .tos_hs         = mdt_sec_ctx_ops
4943         },
4944         {
4945                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4946                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4947                 .tos_hs         = tgt_out_handlers
4948         },
4949         {
4950                 .tos_opc_start  = FLD_FIRST_OPC,
4951                 .tos_opc_end    = FLD_LAST_OPC,
4952                 .tos_hs         = fld_handlers
4953         },
4954         {
4955                 .tos_opc_start  = SEQ_FIRST_OPC,
4956                 .tos_opc_end    = SEQ_LAST_OPC,
4957                 .tos_hs         = seq_handlers
4958         },
4959         {
4960                 .tos_opc_start  = QUOTA_DQACQ,
4961                 .tos_opc_end    = QUOTA_LAST_OPC,
4962                 .tos_hs         = mdt_quota_ops
4963         },
4964         {
4965                 .tos_opc_start  = LLOG_FIRST_OPC,
4966                 .tos_opc_end    = LLOG_LAST_OPC,
4967                 .tos_hs         = tgt_llog_handlers
4968         },
4969         {
4970                 .tos_opc_start  = LFSCK_FIRST_OPC,
4971                 .tos_opc_end    = LFSCK_LAST_OPC,
4972                 .tos_hs         = tgt_lfsck_handlers
4973         },
4974         {
4975                 .tos_opc_start  = OST_FIRST_OPC,
4976                 .tos_opc_end    = OST_LAST_OPC,
4977                 .tos_hs         = mdt_io_ops
4978         },
4979         {
4980                 .tos_hs         = NULL
4981         }
4982 };
4983
4984 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4985 {
4986         struct md_device *next = m->mdt_child;
4987         struct lu_device *d = &m->mdt_lu_dev;
4988         struct obd_device *obd = mdt2obd_dev(m);
4989         struct lfsck_stop stop;
4990
4991         ENTRY;
4992         stop.ls_status = LS_PAUSED;
4993         stop.ls_flags = 0;
4994         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4995
4996         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4997         ping_evictor_stop();
4998
4999         /* Remove the HSM /proc entry so the coordinator cannot be
5000          * restarted by a user while it's shutting down. */
5001         hsm_cdt_procfs_fini(m);
5002         mdt_hsm_cdt_stop(m);
5003
5004         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
5005         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
5006
5007         if (m->mdt_namespace != NULL)
5008                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
5009                                           d->ld_obd->obd_force);
5010
5011         obd_exports_barrier(obd);
5012         obd_zombie_barrier();
5013
5014         mdt_quota_fini(env, m);
5015
5016         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
5017
5018         /* Calling the cleanup functions in the same order as in the mdt_init0
5019          * error path
5020          */
5021         mdt_procfs_fini(m);
5022
5023         target_recovery_fini(obd);
5024         upcall_cache_cleanup(m->mdt_identity_cache);
5025         m->mdt_identity_cache = NULL;
5026
5027         mdt_fs_cleanup(env, m);
5028
5029         tgt_fini(env, &m->mdt_lut);
5030
5031         mdt_hsm_cdt_fini(m);
5032
5033         if (m->mdt_namespace != NULL) {
5034                 ldlm_namespace_free_post(m->mdt_namespace);
5035                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
5036         }
5037
5038         if (m->mdt_md_root != NULL) {
5039                 mdt_object_put(env, m->mdt_md_root);
5040                 m->mdt_md_root = NULL;
5041         }
5042
5043         mdt_seq_fini(env, m);
5044
5045         mdt_fld_fini(env, m);
5046
5047         /*
5048          * Finish the stack
5049          */
5050         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
5051
5052         LASSERT(atomic_read(&d->ld_ref) == 0);
5053
5054         server_put_mount(mdt_obd_name(m), true);
5055
5056         EXIT;
5057 }
5058
5059 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
5060
5061 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
5062                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
5063 {
5064         const struct dt_device_param *dt_conf;
5065         struct mdt_thread_info *info;
5066         struct obd_device *obd;
5067         const char *dev = lustre_cfg_string(cfg, 0);
5068         const char *num = lustre_cfg_string(cfg, 2);
5069         struct tg_grants_data *tgd = &m->mdt_lut.lut_tgd;
5070         struct lustre_mount_info *lmi = NULL;
5071         struct lustre_sb_info *lsi;
5072         struct lu_site *s;
5073         struct seq_server_site *ss_site;
5074         const char *identity_upcall = "NONE";
5075         struct md_device *next;
5076         int rc;
5077         long node_id;
5078         mntopt_t mntopts;
5079         ENTRY;
5080
5081         lu_device_init(&m->mdt_lu_dev, ldt);
5082         /*
5083          * Environment (env) might be missing mdt_thread_key values at that
5084          * point, if device is allocated when mdt_thread_key is in QUIESCENT
5085          * mode.
5086          *
5087          * Usually device allocation path doesn't use module key values, but
5088          * mdt has to do a lot of work here, so allocate key value.
5089          */
5090         rc = lu_env_refill((struct lu_env *)env);
5091         if (rc != 0)
5092                 RETURN(rc);
5093
5094         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
5095         LASSERT(info != NULL);
5096
5097         obd = class_name2obd(dev);
5098         LASSERT(obd != NULL);
5099
5100         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
5101         m->mdt_opts.mo_evict_tgt_nids = 1;
5102         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
5103
5104         lmi = server_get_mount(dev);
5105         if (lmi == NULL) {
5106                 CERROR("Cannot get mount info for %s!\n", dev);
5107                 RETURN(-EFAULT);
5108         } else {
5109                 lsi = s2lsi(lmi->lmi_sb);
5110                 /* CMD is supported only in IAM mode */
5111                 LASSERT(num);
5112                 node_id = simple_strtol(num, NULL, 10);
5113                 obd->u.obt.obt_magic = OBT_MAGIC;
5114                 if (lsi->lsi_lmd != NULL &&
5115                     lsi->lsi_lmd->lmd_flags & LMD_FLG_SKIP_LFSCK)
5116                         m->mdt_skip_lfsck = 1;
5117         }
5118
5119         /* DoM files get IO lock at open by default */
5120         m->mdt_opts.mo_dom_lock = 1;
5121
5122         m->mdt_squash.rsi_uid = 0;
5123         m->mdt_squash.rsi_gid = 0;
5124         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
5125         init_rwsem(&m->mdt_squash.rsi_sem);
5126         spin_lock_init(&m->mdt_lock);
5127         m->mdt_enable_remote_dir = 0;
5128         m->mdt_enable_remote_dir_gid = 0;
5129
5130         atomic_set(&m->mdt_mds_mds_conns, 0);
5131         atomic_set(&m->mdt_async_commit_count, 0);
5132
5133         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
5134         m->mdt_lu_dev.ld_obd = obd;
5135         /* Set this lu_device to obd for error handling purposes. */
5136         obd->obd_lu_dev = &m->mdt_lu_dev;
5137
5138         /* init the stack */
5139         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
5140         if (rc) {
5141                 CERROR("%s: Can't init device stack, rc %d\n",
5142                        mdt_obd_name(m), rc);
5143                 GOTO(err_lmi, rc);
5144         }
5145
5146         s = mdt_lu_site(m);
5147         ss_site = mdt_seq_site(m);
5148         s->ld_seq_site = ss_site;
5149         ss_site->ss_lu = s;
5150
5151         /* set server index */
5152         ss_site->ss_node_id = node_id;
5153
5154         /* failover is the default
5155          * FIXME: we do not failout mds0/mgs, which may cause some problems.
5156          * assumed whose ss_node_id == 0 XXX
5157          * */
5158         obd->obd_replayable = 1;
5159         /* No connection accepted until configurations will finish */
5160         obd->obd_no_conn = 1;
5161
5162         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
5163                 char *str = lustre_cfg_string(cfg, 4);
5164                 if (strchr(str, 'n')) {
5165                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
5166                         obd->obd_replayable = 0;
5167                 }
5168         }
5169
5170         rc = mdt_fld_init(env, mdt_obd_name(m), m);
5171         if (rc)
5172                 GOTO(err_fini_stack, rc);
5173
5174         rc = mdt_seq_init(env, m);
5175         if (rc)
5176                 GOTO(err_fini_fld, rc);
5177
5178         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
5179                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
5180         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
5181                                               LDLM_NAMESPACE_SERVER,
5182                                               LDLM_NAMESPACE_GREEDY,
5183                                               LDLM_NS_TYPE_MDT);
5184         if (m->mdt_namespace == NULL)
5185                 GOTO(err_fini_seq, rc = -ENOMEM);
5186
5187         m->mdt_namespace->ns_lvbp = m;
5188         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
5189
5190         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
5191         /* set obd_namespace for compatibility with old code */
5192         obd->obd_namespace = m->mdt_namespace;
5193
5194         rc = mdt_hsm_cdt_init(m);
5195         if (rc != 0) {
5196                 CERROR("%s: error initializing coordinator, rc %d\n",
5197                        mdt_obd_name(m), rc);
5198                 GOTO(err_free_ns, rc);
5199         }
5200
5201         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
5202                       OBD_FAIL_MDS_ALL_REQUEST_NET,
5203                       OBD_FAIL_MDS_ALL_REPLY_NET);
5204         if (rc)
5205                 GOTO(err_free_hsm, rc);
5206
5207         /* Amount of available space excluded from granting and reserved
5208          * for metadata. It is in percentage and 50% is default value. */
5209         tgd->tgd_reserved_pcnt = 50;
5210
5211         if (ONE_MB_BRW_SIZE < (1U << tgd->tgd_blockbits))
5212                 m->mdt_brw_size = 1U << tgd->tgd_blockbits;
5213         else
5214                 m->mdt_brw_size = ONE_MB_BRW_SIZE;
5215
5216         rc = mdt_fs_setup(env, m, obd, lsi);
5217         if (rc)
5218                 GOTO(err_tgt, rc);
5219
5220         tgt_adapt_sptlrpc_conf(&m->mdt_lut);
5221
5222         next = m->mdt_child;
5223         dt_conf = next->md_ops->mdo_dtconf_get(env, next);
5224
5225         mntopts = dt_conf->ddp_mntopts;
5226
5227         if (mntopts & MNTOPT_USERXATTR)
5228                 m->mdt_opts.mo_user_xattr = 1;
5229         else
5230                 m->mdt_opts.mo_user_xattr = 0;
5231
5232         m->mdt_max_ea_size = dt_conf->ddp_max_ea_size;
5233
5234         if (mntopts & MNTOPT_ACL)
5235                 m->mdt_opts.mo_acl = 1;
5236         else
5237                 m->mdt_opts.mo_acl = 0;
5238
5239         /* XXX: to support suppgid for ACL, we enable identity_upcall
5240          * by default, otherwise, maybe got unexpected -EACCESS. */
5241         if (m->mdt_opts.mo_acl)
5242                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
5243
5244         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
5245                                                 identity_upcall,
5246                                                 &mdt_identity_upcall_cache_ops);
5247         if (IS_ERR(m->mdt_identity_cache)) {
5248                 rc = PTR_ERR(m->mdt_identity_cache);
5249                 m->mdt_identity_cache = NULL;
5250                 GOTO(err_fs_cleanup, rc);
5251         }
5252
5253         rc = mdt_procfs_init(m, dev);
5254         if (rc) {
5255                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
5256                 GOTO(err_recovery, rc);
5257         }
5258
5259         rc = mdt_quota_init(env, m, cfg);
5260         if (rc)
5261                 GOTO(err_procfs, rc);
5262
5263         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
5264         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
5265                            "mdt_ldlm_client", m->mdt_ldlm_client);
5266
5267         ping_evictor_start();
5268
5269         /* recovery will be started upon mdt_prepare()
5270          * when the whole stack is complete and ready
5271          * to serve the requests */
5272
5273         /* Reduce the initial timeout on an MDS because it doesn't need such
5274          * a long timeout as an OST does. Adaptive timeouts will adjust this
5275          * value appropriately. */
5276         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
5277                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
5278
5279         RETURN(0);
5280 err_procfs:
5281         mdt_procfs_fini(m);
5282 err_recovery:
5283         target_recovery_fini(obd);
5284         upcall_cache_cleanup(m->mdt_identity_cache);
5285         m->mdt_identity_cache = NULL;
5286 err_fs_cleanup:
5287         mdt_fs_cleanup(env, m);
5288 err_tgt:
5289         tgt_fini(env, &m->mdt_lut);
5290 err_free_hsm:
5291         mdt_hsm_cdt_fini(m);
5292 err_free_ns:
5293         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
5294         obd->obd_namespace = m->mdt_namespace = NULL;
5295 err_fini_seq:
5296         mdt_seq_fini(env, m);
5297 err_fini_fld:
5298         mdt_fld_fini(env, m);
5299 err_fini_stack:
5300         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
5301 err_lmi:
5302         if (lmi)
5303                 server_put_mount(dev, true);
5304         return(rc);
5305 }
5306
5307 /* For interoperability, the left element is old parameter, the right one
5308  * is the new version of the parameter, if some parameter is deprecated,
5309  * the new version should be set as NULL. */
5310 static struct cfg_interop_param mdt_interop_param[] = {
5311         { "mdt.group_upcall",   NULL },
5312         { "mdt.quota_type",     NULL },
5313         { "mdd.quota_type",     NULL },
5314         { "mdt.som",            NULL },
5315         { "mdt.rootsquash",     "mdt.root_squash" },
5316         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
5317         { NULL }
5318 };
5319
5320 /* used by MGS to process specific configurations */
5321 static int mdt_process_config(const struct lu_env *env,
5322                               struct lu_device *d, struct lustre_cfg *cfg)
5323 {
5324         struct mdt_device *m = mdt_dev(d);
5325         struct md_device *md_next = m->mdt_child;
5326         struct lu_device *next = md2lu_dev(md_next);
5327         int rc;
5328         ENTRY;
5329
5330         switch (cfg->lcfg_command) {
5331         case LCFG_PARAM: {
5332                 struct obd_device          *obd = d->ld_obd;
5333
5334                 /* For interoperability */
5335                 struct cfg_interop_param   *ptr = NULL;
5336                 struct lustre_cfg          *old_cfg = NULL;
5337                 char                       *param = NULL;
5338
5339                 param = lustre_cfg_string(cfg, 1);
5340                 if (param == NULL) {
5341                         CERROR("param is empty\n");
5342                         rc = -EINVAL;
5343                         break;
5344                 }
5345
5346                 ptr = class_find_old_param(param, mdt_interop_param);
5347                 if (ptr != NULL) {
5348                         if (ptr->new_param == NULL) {
5349                                 rc = 0;
5350                                 CWARN("For interoperability, skip this %s."
5351                                       " It is obsolete.\n", ptr->old_param);
5352                                 break;
5353                         }
5354
5355                         CWARN("Found old param %s, changed it to %s.\n",
5356                               ptr->old_param, ptr->new_param);
5357
5358                         old_cfg = cfg;
5359                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
5360                         if (IS_ERR(cfg)) {
5361                                 rc = PTR_ERR(cfg);
5362                                 break;
5363                         }
5364                 }
5365
5366                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
5367                                               cfg, obd);
5368                 if (rc > 0 || rc == -ENOSYS) {
5369                         /* is it an HSM var ? */
5370                         rc = class_process_proc_param(PARAM_HSM,
5371                                                       hsm_cdt_get_proc_vars(),
5372                                                       cfg, obd);
5373                         if (rc > 0 || rc == -ENOSYS)
5374                                 /* we don't understand; pass it on */
5375                                 rc = next->ld_ops->ldo_process_config(env, next,
5376                                                                       cfg);
5377                 }
5378
5379                 if (old_cfg)
5380                         OBD_FREE(cfg, lustre_cfg_len(cfg->lcfg_bufcount,
5381                                                      cfg->lcfg_buflens));
5382                 break;
5383         }
5384         default:
5385                 /* others are passed further */
5386                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
5387                 break;
5388         }
5389         RETURN(rc);
5390 }
5391
5392 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
5393                                           const struct lu_object_header *hdr,
5394                                           struct lu_device *d)
5395 {
5396         struct mdt_object *mo;
5397
5398         ENTRY;
5399
5400         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
5401         if (mo != NULL) {
5402                 struct lu_object *o;
5403                 struct lu_object_header *h;
5404
5405                 o = &mo->mot_obj;
5406                 h = &mo->mot_header;
5407                 lu_object_header_init(h);
5408                 lu_object_init(o, h, d);
5409                 lu_object_add_top(h, o);
5410                 o->lo_ops = &mdt_obj_ops;
5411                 spin_lock_init(&mo->mot_write_lock);
5412                 mutex_init(&mo->mot_lov_mutex);
5413                 init_rwsem(&mo->mot_dom_sem);
5414                 init_rwsem(&mo->mot_open_sem);
5415                 atomic_set(&mo->mot_open_count, 0);
5416                 RETURN(o);
5417         }
5418         RETURN(NULL);
5419 }
5420
5421 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
5422                            const struct lu_object_conf *unused)
5423 {
5424         struct mdt_device *d = mdt_dev(o->lo_dev);
5425         struct lu_device  *under;
5426         struct lu_object  *below;
5427         int                rc = 0;
5428         ENTRY;
5429
5430         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
5431                PFID(lu_object_fid(o)));
5432
5433         under = &d->mdt_child->md_lu_dev;
5434         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
5435         if (below != NULL) {
5436                 lu_object_add(o, below);
5437         } else
5438                 rc = -ENOMEM;
5439
5440         RETURN(rc);
5441 }
5442
5443 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
5444 {
5445         struct mdt_object *mo = mdt_obj(o);
5446         struct lu_object_header *h;
5447         ENTRY;
5448
5449         h = o->lo_header;
5450         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
5451                PFID(lu_object_fid(o)));
5452
5453         LASSERT(atomic_read(&mo->mot_open_count) == 0);
5454         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
5455
5456         lu_object_fini(o);
5457         lu_object_header_fini(h);
5458         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
5459
5460         EXIT;
5461 }
5462
5463 static int mdt_object_print(const struct lu_env *env, void *cookie,
5464                             lu_printer_t p, const struct lu_object *o)
5465 {
5466         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
5467
5468         return (*p)(env, cookie,
5469                     LUSTRE_MDT_NAME"-object@%p(%s %s, writecount=%d)",
5470                     mdto, mdto->mot_lov_created ? "lov_created" : "",
5471                     mdto->mot_cache_attr ? "cache_attr" : "",
5472                     mdto->mot_write_count);
5473 }
5474
5475 static int mdt_prepare(const struct lu_env *env,
5476                 struct lu_device *pdev,
5477                 struct lu_device *cdev)
5478 {
5479         struct mdt_device *mdt = mdt_dev(cdev);
5480         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
5481         struct obd_device *obd = cdev->ld_obd;
5482         int rc;
5483
5484         ENTRY;
5485
5486         LASSERT(obd);
5487
5488         rc = next->ld_ops->ldo_prepare(env, cdev, next);
5489         if (rc)
5490                 RETURN(rc);
5491
5492         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
5493         if (rc)
5494                 RETURN(rc);
5495
5496         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
5497         if (rc)
5498                 RETURN(rc);
5499
5500         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
5501         /* The LFSCK instance is registered just now, so it must be there when
5502          * register the namespace to such instance. */
5503         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
5504
5505         if (mdt->mdt_seq_site.ss_node_id == 0) {
5506                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
5507                                                          &mdt->mdt_md_root_fid);
5508                 if (rc)
5509                         RETURN(rc);
5510         }
5511
5512         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
5513
5514         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
5515         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
5516         LASSERT(obd->obd_no_conn);
5517         spin_lock(&obd->obd_dev_lock);
5518         obd->obd_no_conn = 0;
5519         spin_unlock(&obd->obd_dev_lock);
5520
5521         if (obd->obd_recovering == 0)
5522                 mdt_postrecov(env, mdt);
5523
5524         RETURN(rc);
5525 }
5526
5527 const struct lu_device_operations mdt_lu_ops = {
5528         .ldo_object_alloc   = mdt_object_alloc,
5529         .ldo_process_config = mdt_process_config,
5530         .ldo_prepare        = mdt_prepare,
5531 };
5532
5533 static const struct lu_object_operations mdt_obj_ops = {
5534         .loo_object_init    = mdt_object_init,
5535         .loo_object_free    = mdt_object_free,
5536         .loo_object_print   = mdt_object_print
5537 };
5538
5539 static int mdt_obd_set_info_async(const struct lu_env *env,
5540                                   struct obd_export *exp,
5541                                   __u32 keylen, void *key,
5542                                   __u32 vallen, void *val,
5543                                   struct ptlrpc_request_set *set)
5544 {
5545         int rc;
5546
5547         ENTRY;
5548
5549         if (KEY_IS(KEY_SPTLRPC_CONF)) {
5550                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp));
5551                 RETURN(rc);
5552         }
5553
5554         RETURN(0);
5555 }
5556
5557 /**
5558  * Match client and server connection feature flags.
5559  *
5560  * Compute the compatibility flags for a connection request based on
5561  * features mutually supported by client and server.
5562  *
5563  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
5564  * must not be updated here, otherwise a partially initialized value may
5565  * be exposed. After the connection request is successfully processed,
5566  * the top-level MDT connect request handler atomically updates the export
5567  * connect flags from the obd_connect_data::ocd_connect_flags field of the
5568  * reply. \see mdt_connect().
5569  *
5570  * Before 2.7.50 clients will send a struct obd_connect_data_v1 rather than a
5571  * full struct obd_connect_data. So care must be taken when accessing fields
5572  * that are not present in struct obd_connect_data_v1. See LU-16.
5573  *
5574  * \param exp   the obd_export associated with this client/target pair
5575  * \param mdt   the target device for the connection
5576  * \param data  stores data for this connect request
5577  *
5578  * \retval 0       success
5579  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
5580  * \retval -EBADE  client and server feature requirements are incompatible
5581  */
5582 static int mdt_connect_internal(const struct lu_env *env,
5583                                 struct obd_export *exp,
5584                                 struct mdt_device *mdt,
5585                                 struct obd_connect_data *data, bool reconnect)
5586 {
5587         LASSERT(data != NULL);
5588
5589         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
5590
5591         if (mdt->mdt_bottom->dd_rdonly &&
5592             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5593             !(data->ocd_connect_flags & OBD_CONNECT_RDONLY))
5594                 RETURN(-EACCES);
5595
5596         if (data->ocd_connect_flags & OBD_CONNECT_FLAGS2)
5597                 data->ocd_connect_flags2 &= MDT_CONNECT_SUPPORTED2;
5598
5599         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
5600
5601         if (!mdt->mdt_opts.mo_acl)
5602                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
5603
5604         if (!mdt->mdt_opts.mo_user_xattr)
5605                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
5606
5607         if (OCD_HAS_FLAG(data, BRW_SIZE)) {
5608                 data->ocd_brw_size = min(data->ocd_brw_size,
5609                                          mdt->mdt_brw_size);
5610                 if (data->ocd_brw_size == 0) {
5611                         CERROR("%s: cli %s/%p ocd_connect_flags: %#llx "
5612                                "ocd_version: %x ocd_grant: %d ocd_index: %u "
5613                                "ocd_brw_size unexpectedly zero, network data "
5614                                "corruption? Refusing to connect this client\n",
5615                                mdt_obd_name(mdt),
5616                                exp->exp_client_uuid.uuid,
5617                                exp, data->ocd_connect_flags, data->ocd_version,
5618                                data->ocd_grant, data->ocd_index);
5619                         return -EPROTO;
5620                 }
5621         }
5622
5623         if (OCD_HAS_FLAG(data, GRANT_PARAM)) {
5624                 struct dt_device_param *ddp = &mdt->mdt_lut.lut_dt_conf;
5625
5626                 /* client is reporting its page size, for future use */
5627                 exp->exp_target_data.ted_pagebits = data->ocd_grant_blkbits;
5628                 data->ocd_grant_blkbits  = mdt->mdt_lut.lut_tgd.tgd_blockbits;
5629                 /* ddp_inodespace may not be power-of-two value, eg. for ldiskfs
5630                  * it's LDISKFS_DIR_REC_LEN(20) = 28. */
5631                 data->ocd_grant_inobits = fls(ddp->ddp_inodespace - 1);
5632                 /* ocd_grant_tax_kb is in 1K byte blocks */
5633                 data->ocd_grant_tax_kb = ddp->ddp_extent_tax >> 10;
5634                 data->ocd_grant_max_blks = ddp->ddp_max_extent_blks;
5635         }
5636
5637         /* Save connect_data we have so far because tgt_grant_connect()
5638          * uses it to calculate grant, and we want to save the client
5639          * version before it is overwritten by LUSTRE_VERSION_CODE. */
5640         exp->exp_connect_data = *data;
5641         if (OCD_HAS_FLAG(data, GRANT))
5642                 tgt_grant_connect(env, exp, data, !reconnect);
5643
5644         if (OCD_HAS_FLAG(data, MAXBYTES))
5645                 data->ocd_maxbytes = mdt->mdt_lut.lut_dt_conf.ddp_maxbytes;
5646
5647         /* NB: Disregard the rule against updating
5648          * exp_connect_data.ocd_connect_flags in this case, since
5649          * tgt_client_new() needs to know if this is a lightweight
5650          * connection, and it is safe to expose this flag before
5651          * connection processing completes. */
5652         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
5653                 spin_lock(&exp->exp_lock);
5654                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
5655                 spin_unlock(&exp->exp_lock);
5656         }
5657
5658         data->ocd_version = LUSTRE_VERSION_CODE;
5659
5660         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
5661                 CWARN("%s: MDS requires FID support, but client not\n",
5662                       mdt_obd_name(mdt));
5663                 return -EBADE;
5664         }
5665
5666         if (OCD_HAS_FLAG(data, PINGLESS)) {
5667                 if (ptlrpc_pinger_suppress_pings()) {
5668                         spin_lock(&exp->exp_obd->obd_dev_lock);
5669                         list_del_init(&exp->exp_obd_chain_timed);
5670                         spin_unlock(&exp->exp_obd->obd_dev_lock);
5671                 } else {
5672                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
5673                 }
5674         }
5675
5676         data->ocd_max_easize = mdt->mdt_max_ea_size;
5677
5678         /* NB: Disregard the rule against updating
5679          * exp_connect_data.ocd_connect_flags in this case, since
5680          * tgt_client_new() needs to know if this is client supports
5681          * multiple modify RPCs, and it is safe to expose this flag before
5682          * connection processing completes. */
5683         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
5684                 data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
5685                 spin_lock(&exp->exp_lock);
5686                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
5687                 spin_unlock(&exp->exp_lock);
5688         }
5689
5690         if (OCD_HAS_FLAG(data, CKSUM)) {
5691                 __u32 cksum_types = data->ocd_cksum_types;
5692
5693                 /* The client set in ocd_cksum_types the checksum types it
5694                  * supports. We have to mask off the algorithms that we don't
5695                  * support */
5696                 data->ocd_cksum_types &= cksum_types_supported_server();
5697
5698                 if (unlikely(data->ocd_cksum_types == 0)) {
5699                         CERROR("%s: Connect with checksum support but no "
5700                                "ocd_cksum_types is set\n",
5701                                exp->exp_obd->obd_name);
5702                         RETURN(-EPROTO);
5703                 }
5704
5705                 CDEBUG(D_RPCTRACE, "%s: cli %s supports cksum type %x, return "
5706                        "%x\n", exp->exp_obd->obd_name, obd_export_nid2str(exp),
5707                        cksum_types, data->ocd_cksum_types);
5708         } else {
5709                 /* This client does not support OBD_CONNECT_CKSUM
5710                  * fall back to CRC32 */
5711                 CDEBUG(D_RPCTRACE, "%s: cli %s does not support "
5712                        "OBD_CONNECT_CKSUM, CRC32 will be used\n",
5713                        exp->exp_obd->obd_name, obd_export_nid2str(exp));
5714         }
5715
5716         return 0;
5717 }
5718
5719 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
5720                                    struct mdt_thread_info *info,
5721                                    struct mdt_file_data *mfd)
5722 {
5723         struct lu_context ses;
5724         int rc;
5725         ENTRY;
5726
5727         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
5728         if (rc)
5729                 RETURN(rc);
5730
5731         env->le_ses = &ses;
5732         lu_context_enter(&ses);
5733
5734         mdt_ucred(info)->uc_valid = UCRED_OLD;
5735         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
5736
5737         lu_context_exit(&ses);
5738         lu_context_fini(&ses);
5739         env->le_ses = NULL;
5740
5741         RETURN(rc);
5742 }
5743
5744 static int mdt_export_cleanup(struct obd_export *exp)
5745 {
5746         struct list_head         closing_list;
5747         struct mdt_export_data  *med = &exp->exp_mdt_data;
5748         struct obd_device       *obd = exp->exp_obd;
5749         struct mdt_device       *mdt;
5750         struct mdt_thread_info  *info;
5751         struct lu_env            env;
5752         struct mdt_file_data    *mfd, *n;
5753         int rc = 0;
5754         ENTRY;
5755
5756         INIT_LIST_HEAD(&closing_list);
5757         spin_lock(&med->med_open_lock);
5758         while (!list_empty(&med->med_open_head)) {
5759                 struct list_head *tmp = med->med_open_head.next;
5760                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
5761
5762                 /* Remove mfd handle so it can't be found again.
5763                  * We are consuming the mfd_list reference here. */
5764                 class_handle_unhash(&mfd->mfd_handle);
5765                 list_move_tail(&mfd->mfd_list, &closing_list);
5766         }
5767         spin_unlock(&med->med_open_lock);
5768         mdt = mdt_dev(obd->obd_lu_dev);
5769         LASSERT(mdt != NULL);
5770
5771         rc = lu_env_init(&env, LCT_MD_THREAD);
5772         if (rc)
5773                 RETURN(rc);
5774
5775         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5776         LASSERT(info != NULL);
5777         memset(info, 0, sizeof *info);
5778         info->mti_env = &env;
5779         info->mti_mdt = mdt;
5780         info->mti_exp = exp;
5781
5782         if (!list_empty(&closing_list)) {
5783                 struct md_attr *ma = &info->mti_attr;
5784
5785                 /* Close any open files (which may also cause orphan
5786                  * unlinking). */
5787                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
5788                         list_del_init(&mfd->mfd_list);
5789                         ma->ma_need = ma->ma_valid = 0;
5790
5791                         /* This file is being closed due to an eviction, it
5792                          * could have been modified and now dirty regarding to
5793                          * HSM archive, check this!
5794                          * The logic here is to mark a file dirty if there's a
5795                          * chance it was dirtied before the client was evicted,
5796                          * so that we don't have to wait for a release attempt
5797                          * before finding out the file was actually dirty and
5798                          * fail the release. Aggressively marking it dirty here
5799                          * will cause the policy engine to attempt to
5800                          * re-archive it; when rearchiving, we can compare the
5801                          * current version to the HSM data_version and make the
5802                          * archive request into a noop if it's not actually
5803                          * dirty.
5804                          */
5805                         if (mfd->mfd_mode & FMODE_WRITE)
5806                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
5807
5808                         /* Don't unlink orphan on failover umount, LU-184 */
5809                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
5810                                 ma->ma_valid = MA_FLAGS;
5811                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
5812                         }
5813                         mdt_mfd_close(info, mfd);
5814                 }
5815         }
5816         info->mti_mdt = NULL;
5817         /* cleanup client slot early */
5818         /* Do not erase record for recoverable client. */
5819         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
5820                 tgt_client_del(&env, exp);
5821         lu_env_fini(&env);
5822
5823         RETURN(rc);
5824 }
5825
5826 static inline void mdt_enable_slc(struct mdt_device *mdt)
5827 {
5828         if (mdt->mdt_lut.lut_sync_lock_cancel == NEVER_SYNC_ON_CANCEL)
5829                 mdt->mdt_lut.lut_sync_lock_cancel = BLOCKING_SYNC_ON_CANCEL;
5830 }
5831
5832 static inline void mdt_disable_slc(struct mdt_device *mdt)
5833 {
5834         if (mdt->mdt_lut.lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL)
5835                 mdt->mdt_lut.lut_sync_lock_cancel = NEVER_SYNC_ON_CANCEL;
5836 }
5837
5838 static int mdt_obd_disconnect(struct obd_export *exp)
5839 {
5840         int rc;
5841
5842         ENTRY;
5843
5844         LASSERT(exp);
5845         class_export_get(exp);
5846
5847         if (!(exp->exp_flags & OBD_OPT_FORCE))
5848                 tgt_grant_sanity_check(exp->exp_obd, __func__);
5849
5850         if ((exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) &&
5851             !(exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)) {
5852                 struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
5853
5854                 if (atomic_dec_and_test(&mdt->mdt_mds_mds_conns))
5855                         mdt_disable_slc(mdt);
5856         }
5857
5858         rc = server_disconnect_export(exp);
5859         if (rc != 0)
5860                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
5861
5862         tgt_grant_discard(exp);
5863
5864         rc = mdt_export_cleanup(exp);
5865         nodemap_del_member(exp);
5866         class_export_put(exp);
5867         RETURN(rc);
5868 }
5869
5870 /* mds_connect copy */
5871 static int mdt_obd_connect(const struct lu_env *env,
5872                            struct obd_export **exp, struct obd_device *obd,
5873                            struct obd_uuid *cluuid,
5874                            struct obd_connect_data *data,
5875                            void *localdata)
5876 {
5877         struct obd_export       *lexp;
5878         struct lustre_handle    conn = { 0 };
5879         struct mdt_device       *mdt;
5880         int                      rc;
5881         lnet_nid_t              *client_nid = localdata;
5882         ENTRY;
5883
5884         LASSERT(env != NULL);
5885         LASSERT(data != NULL);
5886
5887         if (!exp || !obd || !cluuid)
5888                 RETURN(-EINVAL);
5889
5890         mdt = mdt_dev(obd->obd_lu_dev);
5891
5892         if ((data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5893             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5894                 atomic_inc(&mdt->mdt_mds_mds_conns);
5895                 mdt_enable_slc(mdt);
5896         }
5897
5898         /*
5899          * first, check whether the stack is ready to handle requests
5900          * XXX: probably not very appropriate method is used now
5901          *      at some point we should find a better one
5902          */
5903         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) &&
5904             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
5905             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
5906                 rc = obd_get_info(env, mdt->mdt_child_exp,
5907                                   sizeof(KEY_OSP_CONNECTED),
5908                                   KEY_OSP_CONNECTED, NULL, NULL);
5909                 if (rc)
5910                         RETURN(-EAGAIN);
5911                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5912         }
5913
5914         rc = class_connect(&conn, obd, cluuid);
5915         if (rc)
5916                 RETURN(rc);
5917
5918         lexp = class_conn2export(&conn);
5919         LASSERT(lexp != NULL);
5920
5921         rc = nodemap_add_member(*client_nid, lexp);
5922         if (rc != 0 && rc != -EEXIST)
5923                 GOTO(out, rc);
5924
5925         rc = mdt_connect_internal(env, lexp, mdt, data, false);
5926         if (rc == 0) {
5927                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5928
5929                 LASSERT(lcd);
5930                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5931                 rc = tgt_client_new(env, lexp);
5932                 if (rc == 0)
5933                         mdt_export_stats_init(obd, lexp, localdata);
5934         }
5935 out:
5936         if (rc != 0) {
5937                 class_disconnect(lexp);
5938                 nodemap_del_member(lexp);
5939                 *exp = NULL;
5940         } else {
5941                 *exp = lexp;
5942                 /* Because we do not want this export to be evicted by pinger,
5943                  * let's not add this export to the timed chain list. */
5944                 if (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
5945                         spin_lock(&lexp->exp_obd->obd_dev_lock);
5946                         list_del_init(&lexp->exp_obd_chain_timed);
5947                         spin_unlock(&lexp->exp_obd->obd_dev_lock);
5948                 }
5949         }
5950
5951         RETURN(rc);
5952 }
5953
5954 static int mdt_obd_reconnect(const struct lu_env *env,
5955                              struct obd_export *exp, struct obd_device *obd,
5956                              struct obd_uuid *cluuid,
5957                              struct obd_connect_data *data,
5958                              void *localdata)
5959 {
5960         lnet_nid_t             *client_nid = localdata;
5961         int                     rc;
5962         ENTRY;
5963
5964         if (exp == NULL || obd == NULL || cluuid == NULL)
5965                 RETURN(-EINVAL);
5966
5967         rc = nodemap_add_member(*client_nid, exp);
5968         if (rc != 0 && rc != -EEXIST)
5969                 RETURN(rc);
5970
5971         rc = mdt_connect_internal(env, exp, mdt_dev(obd->obd_lu_dev), data,
5972                                   true);
5973         if (rc == 0)
5974                 mdt_export_stats_init(obd, exp, localdata);
5975         else
5976                 nodemap_del_member(exp);
5977
5978         RETURN(rc);
5979 }
5980
5981 /* FIXME: Can we avoid using these two interfaces? */
5982 static int mdt_init_export(struct obd_export *exp)
5983 {
5984         struct mdt_export_data *med = &exp->exp_mdt_data;
5985         int                     rc;
5986         ENTRY;
5987
5988         INIT_LIST_HEAD(&med->med_open_head);
5989         spin_lock_init(&med->med_open_lock);
5990         spin_lock(&exp->exp_lock);
5991         exp->exp_connecting = 1;
5992         spin_unlock(&exp->exp_lock);
5993
5994         /* self-export doesn't need client data and ldlm initialization */
5995         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5996                                      &exp->exp_client_uuid)))
5997                 RETURN(0);
5998
5999         rc = tgt_client_alloc(exp);
6000         if (rc)
6001                 GOTO(err, rc);
6002
6003         rc = ldlm_init_export(exp);
6004         if (rc)
6005                 GOTO(err_free, rc);
6006
6007         RETURN(rc);
6008
6009 err_free:
6010         tgt_client_free(exp);
6011 err:
6012         CERROR("%s: Failed to initialize export: rc = %d\n",
6013                exp->exp_obd->obd_name, rc);
6014         return rc;
6015 }
6016
6017 static int mdt_destroy_export(struct obd_export *exp)
6018 {
6019         ENTRY;
6020
6021         target_destroy_export(exp);
6022         /* destroy can be called from failed obd_setup, so
6023          * checking uuid is safer than obd_self_export */
6024         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
6025                                      &exp->exp_client_uuid)))
6026                 RETURN(0);
6027
6028         ldlm_destroy_export(exp);
6029         tgt_client_free(exp);
6030
6031         LASSERT(list_empty(&exp->exp_outstanding_replies));
6032         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
6033
6034         /*
6035          * discard grants once we're sure no more
6036          * interaction with the client is possible
6037          */
6038         tgt_grant_discard(exp);
6039         if (exp_connect_flags(exp) & OBD_CONNECT_GRANT)
6040                 exp->exp_obd->u.obt.obt_lut->lut_tgd.tgd_tot_granted_clients--;
6041
6042         if (!(exp->exp_flags & OBD_OPT_FORCE))
6043                 tgt_grant_sanity_check(exp->exp_obd, __func__);
6044
6045         RETURN(0);
6046 }
6047
6048 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
6049                    struct linkea_data *ldata)
6050 {
6051         int rc;
6052
6053         LASSERT(ldata->ld_buf->lb_buf != NULL);
6054
6055         if (!mdt_object_exists(mdt_obj))
6056                 return -ENODATA;
6057
6058         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6059                           ldata->ld_buf, XATTR_NAME_LINK);
6060         if (rc == -ERANGE) {
6061                 /* Buf was too small, figure out what we need. */
6062                 lu_buf_free(ldata->ld_buf);
6063                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6064                                   ldata->ld_buf, XATTR_NAME_LINK);
6065                 if (rc < 0)
6066                         return rc;
6067                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
6068                 if (ldata->ld_buf->lb_buf == NULL)
6069                         return -ENOMEM;
6070                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6071                                   ldata->ld_buf, XATTR_NAME_LINK);
6072         }
6073         if (rc < 0)
6074                 return rc;
6075
6076         return linkea_init_with_rec(ldata);
6077 }
6078
6079 /**
6080  * Given an MDT object, try to look up the full path to the object.
6081  * Part of the MDT layer implementation of lfs fid2path.
6082  *
6083  * \param[in]     info  Per-thread common data shared by MDT level handlers.
6084  * \param[in]     obj   Object to do path lookup of
6085  * \param[in,out] fp    User-provided struct to store path information
6086  * \param[in]     root_fid Root FID of current path should reach
6087  *
6088  * \retval 0 Lookup successful, path information stored in fp
6089  * \retval -EAGAIN Lookup failed, usually because object is being moved
6090  * \retval negative errno if there was a problem
6091  */
6092 static int mdt_path_current(struct mdt_thread_info *info,
6093                             struct mdt_object *obj,
6094                             struct getinfo_fid2path *fp,
6095                             struct lu_fid *root_fid)
6096 {
6097         struct mdt_device       *mdt = info->mti_mdt;
6098         struct mdt_object       *mdt_obj;
6099         struct link_ea_header   *leh;
6100         struct link_ea_entry    *lee;
6101         struct lu_name          *tmpname = &info->mti_name;
6102         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
6103         struct lu_buf           *buf = &info->mti_big_buf;
6104         char                    *ptr;
6105         int                     reclen;
6106         struct linkea_data      ldata = { NULL };
6107         int                     rc = 0;
6108         bool                    first = true;
6109         ENTRY;
6110
6111         /* temp buffer for path element, the buffer will be finally freed
6112          * in mdt_thread_info_fini */
6113         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
6114         if (buf->lb_buf == NULL)
6115                 RETURN(-ENOMEM);
6116
6117         ldata.ld_buf = buf;
6118         ptr = fp->gf_u.gf_path + fp->gf_pathlen - 1;
6119         *ptr = 0;
6120         --ptr;
6121         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
6122
6123         while (!lu_fid_eq(root_fid, &fp->gf_fid)) {
6124                 struct lu_buf           lmv_buf;
6125
6126                 if (!lu_fid_eq(root_fid, &mdt->mdt_md_root_fid) &&
6127                     lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid))
6128                         GOTO(out, rc = -ENOENT);
6129
6130                 if (lu_fid_eq(mdt_object_fid(obj), tmpfid)) {
6131                         mdt_obj = obj;
6132                         mdt_object_get(info->mti_env, mdt_obj);
6133                 } else {
6134                         mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
6135                         if (IS_ERR(mdt_obj))
6136                                 GOTO(out, rc = PTR_ERR(mdt_obj));
6137                 }
6138
6139                 if (!mdt_object_exists(mdt_obj)) {
6140                         mdt_object_put(info->mti_env, mdt_obj);
6141                         GOTO(out, rc = -ENOENT);
6142                 }
6143
6144                 if (mdt_object_remote(mdt_obj)) {
6145                         mdt_object_put(info->mti_env, mdt_obj);
6146                         GOTO(remote_out, rc = -EREMOTE);
6147                 }
6148
6149                 rc = mdt_links_read(info, mdt_obj, &ldata);
6150                 if (rc != 0) {
6151                         mdt_object_put(info->mti_env, mdt_obj);
6152                         GOTO(out, rc);
6153                 }
6154
6155                 leh = buf->lb_buf;
6156                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
6157                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
6158                 /* If set, use link #linkno for path lookup, otherwise use
6159                    link #0.  Only do this for the final path element. */
6160                 if (first && fp->gf_linkno < leh->leh_reccount) {
6161                         int count;
6162                         for (count = 0; count < fp->gf_linkno; count++) {
6163                                 lee = (struct link_ea_entry *)
6164                                      ((char *)lee + reclen);
6165                                 linkea_entry_unpack(lee, &reclen, tmpname,
6166                                                     tmpfid);
6167                         }
6168                         if (fp->gf_linkno < leh->leh_reccount - 1)
6169                                 /* indicate to user there are more links */
6170                                 fp->gf_linkno++;
6171                 }
6172
6173                 lmv_buf.lb_buf = info->mti_xattr_buf;
6174                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
6175                 /* Check if it is slave stripes */
6176                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6177                                   &lmv_buf, XATTR_NAME_LMV);
6178                 mdt_object_put(info->mti_env, mdt_obj);
6179                 if (rc > 0) {
6180                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
6181
6182                         /* For slave stripes, get its master */
6183                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
6184                                 fp->gf_fid = *tmpfid;
6185                                 continue;
6186                         }
6187                 } else if (rc < 0 && rc != -ENODATA) {
6188                         GOTO(out, rc);
6189                 }
6190
6191                 rc = 0;
6192
6193                 /* Pack the name in the end of the buffer */
6194                 ptr -= tmpname->ln_namelen;
6195                 if (ptr - 1 <= fp->gf_u.gf_path)
6196                         GOTO(out, rc = -EOVERFLOW);
6197                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
6198                 *(--ptr) = '/';
6199
6200                 /* keep the last resolved fid to the client, so the
6201                  * client will build the left path on another MDT for
6202                  * remote object */
6203                 fp->gf_fid = *tmpfid;
6204
6205                 first = false;
6206         }
6207
6208 remote_out:
6209         ptr++; /* skip leading / */
6210         memmove(fp->gf_u.gf_path, ptr,
6211                 fp->gf_u.gf_path + fp->gf_pathlen - ptr);
6212
6213 out:
6214         RETURN(rc);
6215 }
6216
6217 /**
6218  * Given an MDT object, use mdt_path_current to get the path.
6219  * Essentially a wrapper to retry mdt_path_current a set number of times
6220  * if -EAGAIN is returned (usually because an object is being moved).
6221  *
6222  * Part of the MDT layer implementation of lfs fid2path.
6223  *
6224  * \param[in]     info  Per-thread common data shared by mdt level handlers.
6225  * \param[in]     obj   Object to do path lookup of
6226  * \param[in,out] fp    User-provided struct for arguments and to store path
6227  *                      information
6228  *
6229  * \retval 0 Lookup successful, path information stored in fp
6230  * \retval negative errno if there was a problem
6231  */
6232 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
6233                     struct getinfo_fid2path *fp, struct lu_fid *root_fid)
6234 {
6235         struct mdt_device       *mdt = info->mti_mdt;
6236         int                     tries = 3;
6237         int                     rc = -EAGAIN;
6238         ENTRY;
6239
6240         if (fp->gf_pathlen < 3)
6241                 RETURN(-EOVERFLOW);
6242
6243         if (root_fid == NULL)
6244                 root_fid = &mdt->mdt_md_root_fid;
6245
6246         if (lu_fid_eq(root_fid, mdt_object_fid(obj))) {
6247                 fp->gf_u.gf_path[0] = '\0';
6248                 RETURN(0);
6249         }
6250
6251         /* Retry multiple times in case file is being moved */
6252         while (tries-- && rc == -EAGAIN)
6253                 rc = mdt_path_current(info, obj, fp, root_fid);
6254
6255         RETURN(rc);
6256 }
6257
6258 /**
6259  * Get the full path of the provided FID, as of changelog record recno.
6260  *
6261  * This checks sanity and looks up object for user provided FID
6262  * before calling the actual path lookup code.
6263  *
6264  * Part of the MDT layer implementation of lfs fid2path.
6265  *
6266  * \param[in]     info  Per-thread common data shared by mdt level handlers.
6267  * \param[in,out] fp    User-provided struct for arguments and to store path
6268  *                      information
6269  *
6270  * \retval 0 Lookup successful, path information and recno stored in fp
6271  * \retval -ENOENT, object does not exist
6272  * \retval negative errno if there was a problem
6273  */
6274 static int mdt_fid2path(struct mdt_thread_info *info,
6275                         struct lu_fid *root_fid,
6276                         struct getinfo_fid2path *fp)
6277 {
6278         struct mdt_device *mdt = info->mti_mdt;
6279         struct mdt_object *obj;
6280         int    rc;
6281         ENTRY;
6282
6283         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
6284                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
6285
6286         if (!fid_is_sane(&fp->gf_fid))
6287                 RETURN(-EINVAL);
6288
6289         if (!fid_is_namespace_visible(&fp->gf_fid)) {
6290                 CDEBUG(D_INFO, "%s: "DFID" is invalid, f_seq should be >= %#llx"
6291                        ", or f_oid != 0, or f_ver == 0\n", mdt_obd_name(mdt),
6292                        PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
6293                 RETURN(-EINVAL);
6294         }
6295
6296         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
6297         if (IS_ERR(obj)) {
6298                 rc = PTR_ERR(obj);
6299                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
6300                        PFID(&fp->gf_fid), rc);
6301                 RETURN(rc);
6302         }
6303
6304         if (mdt_object_remote(obj))
6305                 rc = -EREMOTE;
6306         else if (!mdt_object_exists(obj))
6307                 rc = -ENOENT;
6308         else
6309                 rc = 0;
6310
6311         if (rc < 0) {
6312                 mdt_object_put(info->mti_env, obj);
6313                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
6314                        PFID(&fp->gf_fid), rc);
6315                 RETURN(rc);
6316         }
6317
6318         rc = mdt_path(info, obj, fp, root_fid);
6319
6320         CDEBUG(D_INFO, "fid "DFID", path %s recno %#llx linkno %u\n",
6321                PFID(&fp->gf_fid), fp->gf_u.gf_path,
6322                fp->gf_recno, fp->gf_linkno);
6323
6324         mdt_object_put(info->mti_env, obj);
6325
6326         RETURN(rc);
6327 }
6328
6329 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key, int keylen,
6330                             void *val, int vallen)
6331 {
6332         struct getinfo_fid2path *fpout, *fpin;
6333         struct lu_fid *root_fid = NULL;
6334         int rc = 0;
6335
6336         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
6337         fpout = val;
6338
6339         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
6340                 lustre_swab_fid2path(fpin);
6341
6342         memcpy(fpout, fpin, sizeof(*fpin));
6343         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
6344                 RETURN(-EINVAL);
6345
6346         if (keylen >= cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*fpin) +
6347                       sizeof(struct lu_fid)) {
6348                 /* client sent its root FID, which is normally fileset FID */
6349                 root_fid = fpin->gf_u.gf_root_fid;
6350                 if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
6351                         lustre_swab_lu_fid(root_fid);
6352
6353                 if (root_fid != NULL && !fid_is_sane(root_fid))
6354                         RETURN(-EINVAL);
6355         }
6356
6357         rc = mdt_fid2path(info, root_fid, fpout);
6358         RETURN(rc);
6359 }
6360
6361 int mdt_get_info(struct tgt_session_info *tsi)
6362 {
6363         char    *key;
6364         int      keylen;
6365         __u32   *vallen;
6366         void    *valout;
6367         int      rc;
6368
6369         ENTRY;
6370
6371         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
6372         if (key == NULL) {
6373                 CDEBUG(D_IOCTL, "No GETINFO key\n");
6374                 RETURN(err_serious(-EFAULT));
6375         }
6376         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
6377                                       RCL_CLIENT);
6378
6379         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
6380         if (vallen == NULL) {
6381                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
6382                                 tgt_name(tsi->tsi_tgt));
6383                 RETURN(err_serious(-EFAULT));
6384         }
6385
6386         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
6387                              *vallen);
6388         rc = req_capsule_server_pack(tsi->tsi_pill);
6389         if (rc)
6390                 RETURN(err_serious(rc));
6391
6392         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
6393         if (valout == NULL) {
6394                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
6395                                 tgt_name(tsi->tsi_tgt));
6396                 RETURN(err_serious(-EFAULT));
6397         }
6398
6399         if (KEY_IS(KEY_FID2PATH)) {
6400                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
6401
6402                 rc = mdt_rpc_fid2path(info, key, keylen, valout, *vallen);
6403                 mdt_thread_info_fini(info);
6404         } else {
6405                 rc = -EINVAL;
6406         }
6407         RETURN(rc);
6408 }
6409
6410 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
6411 {
6412         struct obd_ioctl_data *data = karg;
6413         struct lu_fid *fid;
6414         __u64 version;
6415         struct mdt_object *obj;
6416         struct mdt_lock_handle  *lh;
6417         int rc;
6418         ENTRY;
6419
6420         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
6421             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
6422                 RETURN(-EINVAL);
6423
6424         fid = (struct lu_fid *)data->ioc_inlbuf1;
6425
6426         if (!fid_is_sane(fid))
6427                 RETURN(-EINVAL);
6428
6429         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
6430
6431         lh = &mti->mti_lh[MDT_LH_PARENT];
6432         mdt_lock_reg_init(lh, LCK_CR);
6433
6434         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
6435         if (IS_ERR(obj))
6436                 RETURN(PTR_ERR(obj));
6437
6438         if (mdt_object_remote(obj)) {
6439                 rc = -EREMOTE;
6440                 /**
6441                  * before calling version get the correct MDS should be
6442                  * fid, this is error to find remote object here
6443                  */
6444                 CERROR("nonlocal object "DFID"\n", PFID(fid));
6445         } else if (!mdt_object_exists(obj)) {
6446                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
6447                 rc = -ENOENT;
6448         } else {
6449                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
6450                *(__u64 *)data->ioc_inlbuf2 = version;
6451                 rc = 0;
6452         }
6453         mdt_object_unlock_put(mti, obj, lh, 1);
6454         RETURN(rc);
6455 }
6456
6457 /* ioctls on obd dev */
6458 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
6459                          void *karg, void __user *uarg)
6460 {
6461         struct lu_env      env;
6462         struct obd_device *obd = exp->exp_obd;
6463         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
6464         struct dt_device  *dt = mdt->mdt_bottom;
6465         int rc;
6466
6467         ENTRY;
6468         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
6469         rc = lu_env_init(&env, LCT_MD_THREAD);
6470         if (rc)
6471                 RETURN(rc);
6472
6473         switch (cmd) {
6474         case OBD_IOC_SYNC:
6475                 rc = mdt_device_sync(&env, mdt);
6476                 break;
6477         case OBD_IOC_SET_READONLY:
6478                 rc = dt_sync(&env, dt);
6479                 if (rc == 0)
6480                         rc = dt_ro(&env, dt);
6481                 break;
6482         case OBD_IOC_ABORT_RECOVERY:
6483                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
6484                 obd->obd_abort_recovery = 1;
6485                 target_stop_recovery_thread(obd);
6486                 rc = 0;
6487                 break;
6488         case OBD_IOC_CHANGELOG_REG:
6489         case OBD_IOC_CHANGELOG_DEREG:
6490         case OBD_IOC_CHANGELOG_CLEAR:
6491                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(&env,
6492                                                            mdt->mdt_child,
6493                                                            cmd, len, karg);
6494                 break;
6495         case OBD_IOC_START_LFSCK: {
6496                 struct md_device *next = mdt->mdt_child;
6497                 struct obd_ioctl_data *data = karg;
6498                 struct lfsck_start_param lsp;
6499
6500                 if (unlikely(data == NULL)) {
6501                         rc = -EINVAL;
6502                         break;
6503                 }
6504
6505                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
6506                 lsp.lsp_index_valid = 0;
6507                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
6508                 break;
6509         }
6510         case OBD_IOC_STOP_LFSCK: {
6511                 struct md_device        *next = mdt->mdt_child;
6512                 struct obd_ioctl_data   *data = karg;
6513                 struct lfsck_stop        stop;
6514
6515                 stop.ls_status = LS_STOPPED;
6516                 /* Old lfsck utils may pass NULL @stop. */
6517                 if (data->ioc_inlbuf1 == NULL)
6518                         stop.ls_flags = 0;
6519                 else
6520                         stop.ls_flags =
6521                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
6522
6523                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
6524                 break;
6525         }
6526         case OBD_IOC_QUERY_LFSCK: {
6527                 struct md_device        *next = mdt->mdt_child;
6528                 struct obd_ioctl_data   *data = karg;
6529
6530                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0,
6531                                                  data->ioc_inlbuf1);
6532                 break;
6533         }
6534         case OBD_IOC_GET_OBJ_VERSION: {
6535                 struct mdt_thread_info *mti;
6536                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6537                 memset(mti, 0, sizeof *mti);
6538                 mti->mti_env = &env;
6539                 mti->mti_mdt = mdt;
6540                 mti->mti_exp = exp;
6541
6542                 rc = mdt_ioc_version_get(mti, karg);
6543                 break;
6544         }
6545         case OBD_IOC_CATLOGLIST: {
6546                 struct mdt_thread_info *mti;
6547
6548                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6549                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
6550                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
6551                                        &mti->mti_tmp_fid1);
6552                 break;
6553          }
6554         default:
6555                 rc = -EOPNOTSUPP;
6556                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
6557                         mdt_obd_name(mdt), cmd, rc);
6558         }
6559
6560         lu_env_fini(&env);
6561         RETURN(rc);
6562 }
6563
6564 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
6565 {
6566         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
6567         int rc;
6568         ENTRY;
6569
6570         if (!mdt->mdt_skip_lfsck && !mdt->mdt_bottom->dd_rdonly) {
6571                 struct lfsck_start_param lsp;
6572
6573                 lsp.lsp_start = NULL;
6574                 lsp.lsp_index_valid = 0;
6575                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
6576                                                            OBD_IOC_START_LFSCK,
6577                                                            0, &lsp);
6578                 if (rc != 0 && rc != -EALREADY)
6579                         CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
6580                               mdt_obd_name(mdt), rc);
6581         }
6582
6583         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
6584         RETURN(rc);
6585 }
6586
6587 static int mdt_obd_postrecov(struct obd_device *obd)
6588 {
6589         struct lu_env env;
6590         int rc;
6591
6592         rc = lu_env_init(&env, LCT_MD_THREAD);
6593         if (rc)
6594                 RETURN(rc);
6595         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
6596         lu_env_fini(&env);
6597         return rc;
6598 }
6599
6600 static struct obd_ops mdt_obd_device_ops = {
6601         .o_owner          = THIS_MODULE,
6602         .o_set_info_async = mdt_obd_set_info_async,
6603         .o_connect        = mdt_obd_connect,
6604         .o_reconnect      = mdt_obd_reconnect,
6605         .o_disconnect     = mdt_obd_disconnect,
6606         .o_init_export    = mdt_init_export,
6607         .o_destroy_export = mdt_destroy_export,
6608         .o_iocontrol      = mdt_iocontrol,
6609         .o_postrecov      = mdt_obd_postrecov,
6610         /* Data-on-MDT IO methods */
6611         .o_preprw         = mdt_obd_preprw,
6612         .o_commitrw       = mdt_obd_commitrw,
6613 };
6614
6615 static struct lu_device* mdt_device_fini(const struct lu_env *env,
6616                                          struct lu_device *d)
6617 {
6618         struct mdt_device *m = mdt_dev(d);
6619         ENTRY;
6620
6621         mdt_fini(env, m);
6622         RETURN(NULL);
6623 }
6624
6625 static struct lu_device *mdt_device_free(const struct lu_env *env,
6626                                          struct lu_device *d)
6627 {
6628         struct mdt_device *m = mdt_dev(d);
6629         ENTRY;
6630
6631         lu_device_fini(&m->mdt_lu_dev);
6632         OBD_FREE_PTR(m);
6633
6634         RETURN(NULL);
6635 }
6636
6637 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
6638                                           struct lu_device_type *t,
6639                                           struct lustre_cfg *cfg)
6640 {
6641         struct lu_device  *l;
6642         struct mdt_device *m;
6643
6644         OBD_ALLOC_PTR(m);
6645         if (m != NULL) {
6646                 int rc;
6647
6648                 l = &m->mdt_lu_dev;
6649                 rc = mdt_init0(env, m, t, cfg);
6650                 if (rc != 0) {
6651                         mdt_device_free(env, l);
6652                         l = ERR_PTR(rc);
6653                         return l;
6654                 }
6655         } else
6656                 l = ERR_PTR(-ENOMEM);
6657         return l;
6658 }
6659
6660 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
6661 LU_KEY_INIT(mdt, struct mdt_thread_info);
6662
6663 static void mdt_key_fini(const struct lu_context *ctx,
6664                          struct lu_context_key *key, void* data)
6665 {
6666         struct mdt_thread_info *info = data;
6667
6668         if (info->mti_big_lmm) {
6669                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
6670                 info->mti_big_lmm = NULL;
6671                 info->mti_big_lmmsize = 0;
6672         }
6673
6674         if (info->mti_big_acl) {
6675                 OBD_FREE_LARGE(info->mti_big_acl, info->mti_big_aclsize);
6676                 info->mti_big_acl = NULL;
6677                 info->mti_big_aclsize = 0;
6678         }
6679
6680         OBD_FREE_PTR(info);
6681 }
6682
6683 /* context key: mdt_thread_key */
6684 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
6685
6686 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
6687 {
6688         return lu_ucred(info->mti_env);
6689 }
6690
6691 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
6692 {
6693         return lu_ucred_check(info->mti_env);
6694 }
6695
6696 /**
6697  * Enable/disable COS (Commit On Sharing).
6698  *
6699  * Set/Clear the COS flag in mdt options.
6700  *
6701  * \param mdt mdt device
6702  * \param val 0 disables COS, other values enable COS
6703  */
6704 void mdt_enable_cos(struct mdt_device *mdt, int val)
6705 {
6706         struct lu_env env;
6707         int rc;
6708
6709         mdt->mdt_opts.mo_cos = !!val;
6710         rc = lu_env_init(&env, LCT_LOCAL);
6711         if (unlikely(rc != 0)) {
6712                 CWARN("%s: lu_env initialization failed, cannot "
6713                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
6714                 return;
6715         }
6716         mdt_device_sync(&env, mdt);
6717         lu_env_fini(&env);
6718 }
6719
6720 /**
6721  * Check COS (Commit On Sharing) status.
6722  *
6723  * Return COS flag status.
6724  *
6725  * \param mdt mdt device
6726  */
6727 int mdt_cos_is_enabled(struct mdt_device *mdt)
6728 {
6729         return mdt->mdt_opts.mo_cos != 0;
6730 }
6731
6732 static struct lu_device_type_operations mdt_device_type_ops = {
6733         .ldto_device_alloc = mdt_device_alloc,
6734         .ldto_device_free  = mdt_device_free,
6735         .ldto_device_fini  = mdt_device_fini
6736 };
6737
6738 static struct lu_device_type mdt_device_type = {
6739         .ldt_tags     = LU_DEVICE_MD,
6740         .ldt_name     = LUSTRE_MDT_NAME,
6741         .ldt_ops      = &mdt_device_type_ops,
6742         .ldt_ctx_tags = LCT_MD_THREAD
6743 };
6744
6745 static int __init mdt_init(void)
6746 {
6747         int rc;
6748
6749         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
6750                  FID_NOBRACE_LEN + 1);
6751         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
6752                  FID_LEN + 1);
6753         rc = lu_kmem_init(mdt_caches);
6754         if (rc)
6755                 return rc;
6756
6757         rc = mds_mod_init();
6758         if (rc)
6759                 GOTO(lu_fini, rc);
6760
6761         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
6762                                  LUSTRE_MDT_NAME, &mdt_device_type);
6763         if (rc)
6764                 GOTO(mds_fini, rc);
6765 lu_fini:
6766         if (rc)
6767                 lu_kmem_fini(mdt_caches);
6768 mds_fini:
6769         if (rc)
6770                 mds_mod_exit();
6771         return rc;
6772 }
6773
6774 static void __exit mdt_exit(void)
6775 {
6776         class_unregister_type(LUSTRE_MDT_NAME);
6777         mds_mod_exit();
6778         lu_kmem_fini(mdt_caches);
6779 }
6780
6781 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
6782 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
6783 MODULE_VERSION(LUSTRE_VERSION_STRING);
6784 MODULE_LICENSE("GPL");
6785
6786 module_init(mdt_init);
6787 module_exit(mdt_exit);